LOAN AGREEMENT


                                                        Dated: October 12, 1999
NAME OF BORROWER:

         VICON INDUSTRIES, INC.


PRINCIPAL PLACE OF BUSINESS:

    89 Arkay Drive         Hauppauge                 Suffolk  NY       11788

    Street & No.           City/Town                 County   State    Zip
                                                                       Code

STATE OF INCORPORATION:

         New York State


1.       PREAMBLE

         The Borrower has requested KEYBANK NATIONAL  ASSOCIATION (the "Bank" or
"Lender"), a national banking association, with an office for the transaction of
business located at 1377 Motor Parkway,  Islandia, New York 11788 to grant (i) a
mortgage  loan in the amount of ONE MILLION TWO  HUNDRED  THOUSAND  ($1,200,000)
DOLLARS (the "Loan") to the Borrower,  and the Bank is willing to do so but only
upon the terms and conditions of:

         (a) this Loan Agreement (the "Agreement"),

         (b) a Mortgage Note (the "Mortgage Note"), dated on even date herewith,

         (c) a third Mortgage and Security Agreement dated on even date herewith
covering the Premises (hereinafter defined)(collectively, the "Mortgage"),

         (d) an Assignment of Leases and Rents covering the Premises
(the "Assignment of Rents"),







         (e) and other documents  executed or provided by Borrower in connection
with this transaction (this Agreement, the Note, the Mortgage, the Assignment of
Rents, and the other documents are hereinafter  collectively referred to as, the
"Loan Documents").

2.       USE OF LOAN PROCEEDS

         The Borrower will use the Loan proceeds in connection with the propert
located at 89 Arkay Drive,  Hauppauge,  New York 11788 (the "Premises").

3.       LOAN PAYABLE IN ACCORDANCE WITH NOTE.

         The Loan shall be payable as  provided  for in the Note.  The Bank,  in
addition  to its legal right of setoff  shall be entitled to debit any  accounts
maintained by Borrower with the Bank for payment due under the Note.

4.       INTEREST

         The Loan shall bear interest  computed at a rate (the "Interest  Rate")
as set forth in the Note.

5.       SECURITY

         As collateral security for the payment of all present and future debts,
obligations  and  liabilities  of the  Borrower to the Bank,  including  but not
limited to those set forth in the Note (collectively,  the  "Obligations"),  the
Borrower will grant to the Bank a security interest in all of the following (the
"Collateral"):

         (a) a security  interest  in and  assignment  and pledge of all monies,
deposits  or  other  sums  now or  hereafter  held by the  Bank on  deposit,  in
safekeeping,  transit or otherwise, at any time credited by or due from the Bank
to the Borrower, or in which the Borrower shall have an interest;

         (b) a third mortgage lien on the property  located 89 Arkay Drive,
Hauppauge,  New York 11788 evidence by the Mortgage; and

         (c) an assignment of leases and rents from the Premises.






         From time to time,  the  Borrower  will execute and deliver to the Bank
such assignments,  agreements,  documents, Uniform Commercial Code ("UCC") forms
and other  papers  as the Bank may  request  in  connection  with the  granting,
perfection or continuation of the security interests granted hereunder. Borrower
hereby authorizes the Bank to file at any time UCC forms signed only by the Bank
or copies thereof or of this Agreement.

6.       CONDITIONS TO LOAN

         (a) Conditions Precedent. Borrower agrees that prior to or in any event
no later than the time of the closing of the Loan under this Agreement,  it will
deliver to the Bank:

                  (1)  Certified copies of corporate resolutions authorizing the
                  execution and delivery of all Loan Documents;

                  (2)  Certificate  of good standing from the Secretary of State
                  of New  York and any  other  state or  foreign  country  where
                  Borrower is doing business as to Borrower;

                  (3)  Proof  satisfactory  to the  Bank  that the  Borrower  is
                  authorized to do business in the State of New York;

                  (4)  New York State franchise tax search as to Borrower;

                  (5)  A Certificate of incumbency as to Borrower;

                  (6)  Certificates  of  insurance  for any  insurance  required
                  pursuant to this Agreement or any of the Loan Documents;

                  (7)  UCC searches satisfactory to the Bank;

                  (8)  Duly executed UCC financing statements;

                  (9)  Duly executed Loan Documents;

                  (10) An  opinion  from  counsel  for the  Borrower  as to such
                  matters  as may be  deemed  appropriate  by the  Bank  and its
                  counsel;

                  (11)  Payment  by the  Borrower  of  all  costs  and  expenses
                  incurred by the Bank in establishing the Loan.





         (b)      Financial Reporting Requirements.  The Borrower agrees as
follows:

                  (1)  Borrower  shall  furnish  annually  to the Bank,  audited
                  Financial Statements of Assets and Liabilities,  together with
                  Profit and Loss  Statements and Borrower's Form 10K, not later
                  than ninety (90) days  following  the close of the  Borrower's
                  Fiscal Year, which Financial Statements shall be prepared on a
                  consolidated   basis  by  an  independent   Certified   Public
                  Accountant  (CPA),  reasonably  satisfactory  to the Bank,  in
                  accordance     with     Generally     Accepted      Accounting
                  Principles(GAAP),  including the report/letter, all statements
                  and all footnotes.

                  (2)  Annually,  within  90 days  of its  Fiscal  Year  End and
                  quarterly  within 60 days of each quarter end,  Borrower shall
                  submit  compliance   certificates   setting  forth  Borrower's
                  calculations   of  and   demonstrating   compliance  with  its
                  Financial  Covenants  pursuant to this  Agreement  and further
                  certifying  that,  to the best of its  knowledge,  no Event of
                  Default  has  occurred  hereunder  or is  occurring  or,  if a
                  default or Event of Default has occurred or is occurring, then
                  how  same  shall  be  cured  within  thirty  (30)  days.   The
                  compliance certificates must be duly executed by the Borrower.

                  (3)  Annually,  within  90 days of each  fiscal  year  end and
                  quarterly,  within 60 days of each quarter end, Borrower shall
                  submit management prepared consolidating financial statements.

                  (4) The Borrower shall,  within 60 days following each quarter
                  end,  furnish  to the  Bank  a  copy  of  its  Form  10-Q  and
                  consolidated Financial Statements.






                  (5)  Annually,  Borrower  shall  submit  its  budget  for  the
                  upcoming year including  projected  Profit and Loss Statements
                  and  a  Balance  Sheet,  said  budget  to  be  delivered  with
                  Borrower's Year End Financial Statements.

                  (6) Borrower shall submit such other  financial  documentation
                  to the Bank as the Bank may reasonably  require so long as the
                  Loan is outstanding.

                  (7) Failure to deliver  financial  information  within fifteen
                  (15) days of the date  specified  will  constitute an Event of
                  Default hereunder.

         (c) Financial Covenants.  Except for Section 6(c)5 below, the following
financial   covenants  are  intended  to  duplicate   those   contained  in  the
$14,000,000.00  credit agreement (the "Credit Agreement") between the Lender and
Borrower  dated July 20, 1998.  For so long as the Credit  Agreement  remains in
effect,  including all  extension  and renewal  periods,  all  modifications  or
waivers of financial  covenants  under the Credit  Agreement will also modify or
waive the corresponding  financial  covenants under this Loan Agreement.  At the
termination  of the Credit  Agreement  if prior to the  termination  of the Loan
Agreement, the then effective and governing financial covenants under the Credit
Agreement will be deemed to be the effective  financial covenants under the Loan
Agreement  and same will be  confirmed in writing by an agreement to be executed
by the Borrower and the Lender.

The Borrower  covenants and agrees that, from and after the date of execution of
this Agreement,  and so long as any amount may be borrowed  hereunder or remains
unpaid  on  account  of the  Note or is  otherwise  due to the Bank  under  this
Agreement  or any  related  document,  Borrower  shall  comply  with each of the
following covenants:

                           (1) Net  Income.  Borrower  shall  on a  consolidated
                  basis (i)  maintain  a positive  Net  Income on a fiscal  year
                  basis, (ii) not have two consecutive  fiscal quarters in which
                  it has net  losses  that  total in excess of  $500,000.00  and
                  (iii) not have net losses for four consecutive fiscal quarters
                  that total in excess of $800,000.00.

                           (2)  Maximum  Liabilities  to Worth  Ratio.  Borrower
                  shall maintain on a consolidated basis at all times a ratio of
                  Total  Liabilities  to  Tangible  Net  Worth of not more  than
                  1.50:1.0.





                           (3) Debt Coverage Ratio. Borrower shall maintain on a
                  consolidated  basis at all times a Debt Coverage  Ratio of not
                  less than 1.25:1.0,  to be tested  quarterly on a rolling four
                  quarter basis.

                           (4) Capital Expenditures. Borrower shall not make any
                  Capital  Expenditures  in excess of  $2,000,000.00  during any
                  fiscal  year,  excluding  Capital  Expenditures   incurred  in
                  Borrower's  one time expansion of its facility on Arkay Drive,
                  Hauppauge,  New York and Acquisitions  identified as Permitted
                  Acquisitions  under  section  9.07  of the  Credit  Agreement,
                  including  acquisitions permitted by waiver or modification to
                  such Credit Agreement.

                           (5)   Modification/Release  of  Financial  Covenants.
                  Notwithstanding  anything  to the  contrary  herein,  upon the
                  written  request  of  Borrower  to the  Lender,  (i) the  Debt
                  Coverage  Ratio set forth above shall be  increased to 1.3:1.0
                  to be  tested  as  hereinafter  set  forth,  and (ii)  Capital
                  Expenditures,  the Maximum  Liabilities to Worth Ratio and Net
                  Income  financial  covenants set forth above shall be released
                  PROVIDED Borrower has complied with all of the following:

                                    (a)  The  Loan  to  Value   Ratio   must  be
                           decreased to sixty-five  (65%) percent or less(either
                           by normal amortization and/or a partial prepayment);

                                    (b) Borrower has provided a new appraisal of
                           the  Premises to the Bank  evidencing a Loan to Value
                           Ratio of sixty-five (65%) percent or less prepared by
                           a Bank approved appraiser and in form satisfactory to
                           the Bank; and

                                    (c) Borrower is not in default  under any of
                           the  Loan   Documents   (as   defined   in  the  Loan
                           Agreement).






                           (6)  Determination  of  Compliance.  Compliance  with
                  these financial  covenants shall be determined by reference to
                  the financial  statements of Borrower  calculated for Borrower
                  and its Subsidiaries delivered to Lender and shall exclude any
                  balance  sheet  information  or results of  operations  of any
                  Subsidiary  which  is not  also  a  Guarantor.  All  financial
                  covenants shall be applicable at all times and shall be tested
                  at the end of each  fiscal  quarter  except  as set  forth  in
                  paragraph 6(c)(1) above.

                           (7)      DEFINITIONS.

                           "Acquisition" means any transaction pursuant to which
                  Borrower  or any  of  its  Subsidiaries  (i)  acquires  equity
                  securities  (or  warrants,  option or other  rights to acquire
                  such  securities)  of any  corporation,  partnership,  limited
                  liability  company  or  other  business  organization,  or any
                  Person which is not then a Subsidiary of Borrower, pursuant to
                  a  solicitation  of  tenders  thereof,   or  in  one  or  more
                  negotiated block, market or other transactions not involving a
                  tender offer,  or a combination  of any of the  foregoing,  or
                  (ii)  makes any  Person not then a  Subsidiary  of  Borrower a
                  Subsidiary of Borrower, or causes any such Person to be merged
                  into or purchased by Borrower or any of its  Subsidiaries,  in
                  any case  pursuant  to a  merger,  purchase  of  assets or any
                  reorganization  providing  for the delivery or issuance to the
                  holders  of such  Person's  then  outstanding  securities,  in
                  exchange  for  such  securities,  of  cash  or  securities  of
                  Borrower or any of its Subsidiaries, or a combination thereof,
                  or (iii) purchases all or substantially all of the business or
                  assets of any Person.

                           "Affiliate"  means,  with respect to any Person,  any
                  Person  (i)  that  directly  or  indirectly  controls,  or  is
                  controlled by, or is under common  control with,  such Person,
                  (ii) that directly or indirectly beneficially owns or holds 5%
                  or more of any class of voting stock of such Person,  (iii) 5%
                  or more of the voting stock of which is directly or indirectly
                  beneficially  owned or held by such  Person,  (iv)  which is a
                  partnership or limited  liability company in which such Person
                  is  respectively  a general  partner  or manager or (v) who is
                  among  such  Person's  officers,  directors  joint  venturers,
                  managers or partners. The term "control" means the possession,
                  directly  or  indirectly,  of the power to direct or cause the
                  direction of the management and policies of a Person,  whether
                  through the ownership of voting  securities,  by contract,  or
                  otherwise.





                           "Amortization" means amortization as determined in
                  accordance with GAAP.

                           "Capital  Expenditures"  means  expenditures  for any
                  fixed assets or improvements, replacements,  substitutions, or
                  additions  thereto  which have a useful  life of more than one
                  year.

                           "Capital  Lease" means any lease which is required to
                  be   capitalized  on  the  balance  sheet  of  the  lessee  in
                  accordance with GAAP.

                           "Chun  Shin"  means  Chun Shin  Industries,  Inc.,  a
                  corporation formed under the laws of the Republic of Korea.

                           "Current  Debt" means,  on the date of  determination
                  with respect to any Person, that portion of such Person's long
                  term  debt,  including  Capital  Leases  and  the  outstanding
                  principal  balance of the Term Loan,  that is due and  payable
                  within the next 12 months.  Current  Debt  shall  exclude  all
                  Revolving Credit Loans.

                           "Debt"   means,   with  respect  to  any  Person  (i)
                  indebtedness   of  such  Person  for  borrowed   money,   (ii)
                  indebtedness relating to the acquisition of property where the
                  full  purchase  price is not paid at the time such property is
                  acquired  but is  required  to be  paid,  in whole or in part,
                  thereafter (excluding trade debt and accounts payable),  (iii)
                  the face amount of any  outstanding  letters of credit  issued
                  for the account of such Person, (iv) obligations arising under
                  acceptance facilities,  (v) guaranties and endorsements (other
                  than  endorsements  for  collection in the ordinary  course of
                  business) under which such Person has a direct, non-contingent
                  payment  or   performance   obligation,   (vi)  other  direct,
                  non-contingent  obligations to purchase,  to provide funds for
                  payment, to supply funds to invest in any Person, or otherwise
                  to assure a creditor against loss, (vii)  obligations  secured
                  by any Lien on property of such Person,  (viii) obligations of
                  such  Person  as  lessee   under   Capital   Leases  and  (ix)
                  indebtedness  of  such  Person  evidenced  by  a  note,  bond,
                  indenture or similar instrument.






                           "Debt  Coverage  Ratio"  means  (i) the  consolidated
                  EBITDA  of  Borrower  and its  Subsidiaries,  minus  any  cash
                  Dividends  paid or  declared  to be paid  to  shareholders  of
                  Borrower  for the prior 12 month  period,  (ii) divided by the
                  sum  of  the  Current  Debt   (including   Current  Chun  Shin
                  Acquisition  Debt,  except as  provided  below)  and  Interest
                  Expense of Borrower and its Subsidiaries all on a consolidated
                  basis, as determined at the end of each fiscal quarter,  based
                  upon Borrower's  financial  statements delivered in accordance
                  with the Loan Agreement.  If Borrower completes an Acquisition
                  of Chun Shin under terms where all or part of the  Acquisition
                  price is payable  following  consummation  of the  Acquisition
                  ("Chun  Shin  Acquisition  Debt"),  and  if,  at the  date  of
                  determination  of  Debt  Coverage  Ratio,  the  amount  of the
                  Revolving   Credit   Commitment  then  available  to  Borrower
                  hereunder  equals or  exceeds  that  portion  of the Chun Shin
                  Acquisition  Debt which is due and payable  within the next 12
                  months ("Current Chun Shin Acquisition Debt"), then 50% of the
                  Current  Chun Shin  Acquisition  Debt shall be  excluded  from
                  Current Debt for the purposes of computing  the Debt  Coverage
                  Ratio.

                           "Depreciation" means depreciation as determined in
                  accordance with GAAP.

                           "Dividends" means, for any period,  dividends paid by
                  Borrower or any Subsidiary during such period.

                           "EBITDA"  means,  for any period,  the sum of (i) Net
                  Income, (ii) income taxes paid or payable to any government or
                  government instrumentality, (iii) all Interest Expense paid or
                  accrued on any Debt, (iv)  Depreciation  and (v)  Amortization
                  during such period.

                           "GAAP" means generally accepted accounting principles
                  in the  United  States of  America  as in effect  from time to
                  time,  applied  on a basis  consistent  with those used in the
                  preparation of the Borrower's financial statements.






                           "Guarantors"  means Vicon Industries  International
                  Sales Corp.,  Vicon Industries  Foreign Sales Corp. and
                  each future Subsidiary which is required to become a party to
                  the Guaranty in accordance with the Credit Agreement.

                           "Interest Expense" means interest expense of Borrower
                  and its Subsidiaries on a consolidated  basis for a particular
                  period as reflected in its financial statements and calculated
                  in accordance with GAAP.

                           "Lien"  means  any  lien  (statutory  or  otherwise),
                  security interest,  mortgage, deed of trust, priority, pledge,
                  charge,  conditional sale, title retention agreement,  Capital
                  Lease or other  encumbrance or similar right of others, or any
                  agreement to give any of the foregoing.

                           "Net Income" means with respect to any Person for any
                  period,  such  Person's net income after taxes for such period
                  as reflected on such Person's financial statements.

                           "Person"    means   an    individual,    partnership,
                  corporation,  business  trust,  joint  stock  company,  trust,
                  limited liability company,  unincorporated association,  joint
                  venture,  governmental  authority  or other entity of whatever
                  nature.

                           "Revolving Credit Commitment" means the obligation of
                  the  Lender  to  extend   revolving   credit  to  Borrower  in
                  accordance  with the terms of a certain credit  agreement (the
                  "Credit  Agreement")  dated  July  20,  1998 in the  aggregate
                  principal amount not to exceed  $7,500,000.00,  or if Borrower
                  elects  to   increase   the   Revolving   Credit   Commitment,
                  $9,500,000.00,  as such  amount may be  reduced  or  otherwise
                  modified  from  time to time in  accordance  with the terms of
                  said Credit Agreement.

                           "Revolving  Credit Loans" mean any Revolving Credit
                  Loan made by the Lender to the Borrower under the Credit
                  Agreement.






                           "Revolving Credit Termination Date" means the earlier
                  of (i) the date on which the Revolving  Credit Loan is paid in
                  full and the Revolving Credit  Commitments shall terminate and
                  the obligations of Borrower in connection  therewith have been
                  satisfied  or (ii) the date  four  years  from the date of the
                  Revolving Credit  Commitment unless such date is not a Banking
                  Day, then the next succeeding Banking Day.

                           "Subsidiary"   means,   as   to   any   Person,   any
                  corporation,  partnership,  limited liability company or other
                  business  organization  or entity of which at least a majority
                  of the securities or other ownership interests having ordinary
                  voting power  (absolutely or contingently) for the election of
                  directors or other persons performing similar functions are at
                  the time owned directly or indirectly by such Person.  For the
                  purposes of the  financial  covenants  set forth in Article 10
                  under the Credit Agreement and in the  Modification  Agreement
                  and the  definitions  of Current  Debt,  Debt,  Debt  Coverage
                  Ratio,  EBITDA,  Interest  Expense,  Net Income,  Tangible Net
                  Worth, Total Assets and Total  Liabilities,  the balance sheet
                  information  and results of  operations  of Vicon U.K. and any
                  other  Subsidiary  which is not a  Guarantor  under the Credit
                  Agreement shall be excluded.

                           "Tangible Net Worth" means,  at any particular  date,
                  the amount of excess of Total  Assets  over Total  Liabilities
                  which  would,  in  accordance  with GAAP,  be  included  under
                  shareholders'  equity  on  a  consolidated  balance  sheet  of
                  Borrower and its  Subsidiaries as at such date. There shall be
                  excluded from the determination of Total Assets all intangible
                  assets, including, without limitation,  organization expenses,
                  patents,  trademarks,  copyrights,  goodwill, covenants not to
                  compete,  research and  developmental  costs,  training costs,
                  treasury stock, deferred charges and any loans receivable from
                  officers  or  Affiliates,  other  than loans  receivable  from
                  Affiliates  incurred  as a  result  of  sales  of goods in the
                  ordinary course of business.

                           "Term Loan" means the Term Loan made to Borrower by
                  Lender under the Credit Agreement.

                           "Total  Assets"  means,  at a  particular  date,  all
                  amounts  which would,  in  accordance  with GAAP,  be included
                  under assets on a  consolidated  balance sheet of Borrower and
                  its Subsidiaries as at such date.






                           "Total  Liabilities" means, at a particular date, all
                  amounts  which would,  in  accordance  with GAAP,  be included
                  under liabilities on a consolidated  balance sheet of Borrower
                  and its Subsidiaries as at such date.

7.       REPRESENTATIONS AND WARRANTIES

         The Borrower represents and warrants that:

         (a) The Borrower is a corporation duly organized and existing under the
laws of the State of New York and is  authorized  to do business in the State of
New York and, that it has full corporate  power to execute this  Agreement,  the
Note and all other Loan  Documents  and do all things  required of it hereunder,
and that the  Borrower's  main office for doing  business is as indicated at the
beginning of this Agreement;

         (b) The Borrower maintains offices at the following location(s):
89 Arkay Drive, Hauppauge, New York 11788;

         (c) The Borrower's most recent financial  statement as submitted to the
Bank fairly represents the Borrower's financial condition as of the dates shown;
that the Borrower is the owner of all of the assets and property as shown in the
financial statement, subject to no liens, encumbrances or charges whatever other
than as set forth in said  financial  statement,  and that the  Borrower  has no
liabilities other than shown on said financial statement;

         (d) The Borrower is the owner of the Collateral,  free and clear of any
liens, claims or rights of any other party, except as listed in Schedule A;

         (e)  There is no  action,  litigation,  suit,  proceeding,  inquiry  or
investigation,  at law or in equity, or before or by any court,  public board or
body,  pending,  threatened against or affecting the Borrower which involves the
possibility of materially adversely affecting the property, business, profits or
conditions (financial or otherwise) of the Borrower;

         (f) The Borrower has filed all  required  federal,  state and local tax
returns and has paid all taxes shown on such returns as they become due;






         (g) The  execution and delivery of this  Agreement,  and all other Loan
Documents  will not  violate any  provision  of this  Agreement  or of any other
agreement or  instrument  to which the Borrower is a party for which  waivers of
same have not been obtained;

         (h) All necessary  corporate  action to authorize the Borrower's  entry
into this  Agreement and the execution of the Loan  Documents has been taken and
that the Loan Documents when executed by the Borrower shall be valid and binding
obligations of the Borrower enforceable in accordance with their terms;

         (i) The execution,  delivery and performance of the Loan Documents, the
consummation of the  transactions  therein  contemplated and compliance with the
provisions  of each by the  Borrower  does not and will not (i)  conflict  with,
violate  or  result  in a  breach  of any  of the  terms  or  provisions  of the
certificate of  incorporation  or by-laws of the Borrower,  (ii) require consent
which has not hereto been  received or will result in a breach or default of any
credit  agreement,  indenture,  purchase  agreement,  mortgage,  deed of  trust,
commitment, guaranty agreement, or any other instrument to which the Borrower is
a party,  or by which the Borrower may be bound or affected for which waivers of
same have not been obtained, or (iii) conflict with or violate any existing law,
rule,  regulation,  judgment,  order or decree of any  government,  governmental
instrumentality,  or court,  domestic or foreign,  having  jurisdiction over the
Borrower or any of its properties;

         (j) The Borrower possesses all licenses, trademarks,  trademark rights,
and  tradenames  which are  required  for the  conduct of its  business  without
conflict with the rights of others.

8.       NEGATIVE COVENANTS

         While the Loan remains  outstanding,  the Borrower  agrees that it will
not, without prior written consent of the Bank:

         (a) Merge or consolidate  with any other person,  firm,  corporation or
business if (i) Borrower is not the surviving corporation, or (ii) the surviving
entity has a lower credit rating than Borrower; or

         (b)  Sell,  lease,  assign,   transfer  or  otherwise  dispose  of  any
significant  assets or  property,  except in the normal  course of  business  as
presently conducted, and for full and adequate consideration.

9.       AFFIRMATIVE COVENANTS






         While the Loan remains outstanding, the Borrower agrees that it will:

         (a)      Make all payments required under the Note;

         (b)  Furnish  the Bank with copies of  Financial  Statements  and other
financial documentation as set forth herein;

         (c) Pay and discharge any and all taxes,  assessments and  governmental
charges  on the due date  thereof,  unless the same are being  contested  by the
Borrower  in good faith and  provided  such  contest  does not impair the Bank's
security;

         (d) Timely comply with all of the terms and conditions of the Loan
Documents;

         (e) Keep all of its property insured by insurance companies licensed to
do business in New York and in such other state(s) where the property is located
against  loss or damage by fire or other risk usually  insured  against by other
owners or users of such properties in similar businesses under extended coverage
endorsement and against theft,  burglary, and pilferage together with such other
hazards  as the  Bank may  from  time to time  reasonably  request,  in  amounts
satisfactory  to the Bank.  The Borrower shall deliver the policy or policies of
such  insurance to the Bank. All such insurance  shall contain  endorsements  in
form  satisfactory  to the  Bank  providing  that  the  insurance  shall  not be
cancelable  except upon thirty  (30) days prior  written  notice to the Bank and
showing the Bank as a party  insured as its  interest  may appear.  The Borrower
shall  promptly  notify the Bank of any event or  occurrence  causing a material
loss or  decline  in value of  property  insured  or the  existence  of an event
justifying  a  material  claim  under any  insurance  and the  estimated  amount
thereof;

         (f) Keep the Bank fully informed as to all matters that may affect the
Loan;

         (g) Preserve and maintain its assets and keep the same in good order
and condition;

         (h) If the  Bank so  reasonably  requires,  provide  the  Bank  with an
appraisal or  appraisals  of the Premises  subsequent to the closing of the Loan
but not more often than once every twelve (12) months  except as  otherwise  set
forth herein.






         All costs of such future appraisals shall be paid by the Borrower.

10.      DEFAULT

         Each of the  following  shall  be an  "Event  of  Default"  under  this
Agreement:

         (a) The occurrence of an Event of Default under the Note, any of the
Loan Documents; or

         (b) Borrower shall fail to perform any other obligation  required to be
performed under this Agreement or any other Loan Document,  for thirty (30) days
after receipt of notice from the Bank of such failure; or

         (c) Any warranty,  representation or other statement by or on behalf of
Borrower in any Loan Document or instrument  furnished in compliance  with or in
reference to any Loan  Document  proves in the Bank's  reasonable  opinion to be
false or misleading in any material respect; or

         (d) Borrower shall  generally not be paying debts as they become due or
file a petition or seek relief under or take  advantage of any  insolvency  law;
make an assignment  for the benefit of creditors;  commence a proceeding for the
appointment  of a receiver,  trustee,  liquidator,  custodian or  conservator of
Borrower or of the whole or substantially  all of Borrower's  property or of any
collateral  pledged  as  security  for the Note;  or if  Borrower  shall  file a
petition or an answer to a petition under any chapter of the  Bankruptcy  Reform
Act of 1978, as amended (or any successor statute  thereto),  or file a petition
or seek relief under or take  advantage  of any other  similar law or statute of
the United  States of America,  any State  thereof,  or any  foreign  country or
subdivision thereof; or






         (e) A Court of competent jurisdiction shall enter an order, judgment or
decree appointing or authorizing a receiver, trustee,  liquidator,  custodian or
conservator  of  Borrower  or of the whole or  substantially  all of  Borrower's
property,  or any portion of the collateral pledged as security for the Note, or
enter an order for  relief  against  Borrower  in any case  commenced  under any
chapter of the  Bankruptcy  Reform Act of 1978,  as  amended  (or any  successor
statute thereto),  or grant relief under any other similar law or statute of the
United  States  of  America,  any  State  thereof,  or any  foreign  country  or
subdivision  thereof and the same is not stayed or discharged  within sixty (60)
days of entry; or

         (f) Under the provisions of any law for the relief or aid of debtors, a
court of competent jurisdiction or a receiver, trustee, liquidator, custodian or
conservator  shall assume custody or control or take possession from Borrower of
all or substantially all of Borrower's property or any portion of any collateral
pledged as security for the Note; or

         (g) There is commenced  against  Borrower any proceeding for any of the
foregoing relief or if a petition is filed against Borrower under any chapter of
the  Bankruptcy  Reform  Act of  1978,  as  amended  (or any  successor  statute
thereto),  or under any other  similar  law or statute  of the United  States of
America,  any State thereof, or any foreign country or subdivision  thereof, and
such proceeding or petition remains  undismissed for a period of sixty (60) days
or if Borrower by any act indicates  consent to,  approval of or acquiescence in
any such proceeding or petition; or

         (h) The Bank  receives  a notice  to  creditors  with  regard to a bulk
transfer by Borrower pursuant to Article VI of the Uniform Commercial Code; or

         (i) In the event that (a) any entity then having a lesser credit rating
than Borrower shall acquire  beneficial  ownership of a majority interest in the
voting  stock of Borrower,  or (b) the Borrower  shall merge with such an entity
and shall not be the surviving corporation; or

         (j) Borrower shall fail to satisfy a final judgment  entered against it
for the payment of money within thirty (30) days from entry or  affirmance,  and
in any event, prior to any execution or enforcement thereof; or

         (k) Borrower shall be in default under any other  agreement or document
with the Bank; or

         (l) Borrower  shall fail to obtain and deliver to Lender a  certificate
of occupancy (or  certificate of compliance) for the open permit on the Premises
identified as Permit number 101969 with the Town of Smithtown within one hundred
twenty (120) days of the date hereof.






         If an Event of  Default  occurs  or,  if an  event  which,  but for the
passage of time, the giving of notice or both (unless same is required under the
Loan Documents),  would constitute an Event of Default, the Bank may declare the
Loan and any other  Obligations to be  immediately  due and payable and the Bank
shall have,  in addition to all other  rights and remedies  including  those set
forth in the  Mortgage  and in the  Assignment  of Leases and Rents,  those of a
secured  party  under  the  Uniform  Commercial  Code of the  State  of New York
including without limitation, the right to institute foreclosure proceedings and
the right to take  possession of all  Collateral,  and for that purpose the Bank
may enter the Premises  where the Collateral may be situated and remove the same
therefrom  without legal  process.  At the request of the Bank,  if  applicable,
Borrower  (i)  will  disclose  the  exact  location  of  any  personal  property
Collateral,  (ii) assist in the collection of any personal property  Collateral,
and (iii) assemble any personal property  Collateral at a place to be designated
by the Bank.  The  requirements  of  reasonable  notice shall be met if the Bank
gives to the  Borrower at least five (5) days prior  written  notice of the time
and place of any public sale of any personal property  Collateral or if the time
after which any private sale or any other  intended  disposition  is to be made.
For the purpose of realizing the Bank's rights in the  Collateral,  the Bank may
endorse  notes,  checks,  drafts,  money  orders,  documents  of  title or other
evidences  of  payment,  shipment  or  storage  or  endorse  any other  forms of
Collateral  on  behalf of and in the name of  Borrower  and may  compromise  and
settle claims and otherwise  generally  deal with the  Collateral.  The Borrower
hereby irrevocably  appoints the Bank as its lawful  attorney-in-fact  with full
power of substitution  for the Borrower in its name, place and stead to take all
actions with respect to the Collateral permitted hereunder.

         Any sale or  disposition  of  Collateral by the Bank shall be done in a
commercially   reasonable   manner.  All  decisions  with  respect  to  sale  or
disposition of the Collateral shall be made solely by the Bank.

         All  proceeds  received  from  the  disposition  and/or  collection  of
Collateral  shall be applied by the Bank, in its discretion and in such order as
it elects,  to (i) the payment of all expenses  incurred in connection  with the
sale and/or collection of the Collateral,  including reasonable  attorney's fees
and other expenses and  disbursements  and the reasonable  expenses of retaking,
collecting,  holding, preparing for sale, sale and the like and (ii) the payment
of all interest, principal and other sums due under the Loan Documents.





11.      INDEMNIFICATION

         The Bank by virtue of the pledge and assignment of the Collateral to it
hereunder shall not be deemed to have assumed the Borrower's  obligations  under
the Collateral or be  responsible  for servicing the Collateral and the Borrower
shall and does hereby agree to defend,  indemnify  and hold the Bank harmless of
and from any and all liability of any name, nature or kind which may arise or be
alleged  to  have  arisen  as a  result  of the  pledge  and  assignment  of the
Collateral to the Bank hereunder.

12.      FEES AND EXPENSES

         All  filing  fees,  recording  costs  and all  other  fees or  charges,
including reasonable attorneys fees, incurred by the Bank in connection with the
preparation of this Agreement and the other Loan Documents and in perfecting and
defending  the  Bank's  security  interests  in the  Collateral  and its  rights
hereunder,  shall be deemed to be sums payable under the Note and secured by the
Collateral and shall be paid by the Borrower on demand.

13.      GENERAL PROVISIONS

         (a) Inspection.  The Bank may examine the Borrower's  books and records
with respect to the Collateral  and this  Agreement at all  reasonable  times to
insure  compliance  with  the  terms of the Loan  Documents.  Additionally,  the
Borrower  hereby agrees to allow the Bank,  its  personnel and  representatives,
access to the  Borrower's  books  and  records  for the  purpose  of  conducting
periodic  audits.  Such  audits  shall  be done as  frequently  as the  Bank may
reasonably  determine is necessary and Borrower  shall pay the Bank an audit fee
of $650.00 per audit, it being  understood that audit fees shall be charged only
at such times as an Event of Default has occurred and is continuing.

         (b) Notice To Others.  The Bank may, upon the occurrence of an Event of
Default or upon the  occurrence of an event which,  but for the passage of time,
the giving of notice or both unless same is required  under the Loan  Documents,
would  constitute  an Event of  Default,  notify  any  party  obligated  to make
payments  to  Borrower  under any  lease of the  Premises  or  portion , to make
payment directly to the Bank.






         (c) Paragraph  Headings.  Paragraph  headings are for  convenience  and
shall not operate to change or modify any of the terms of this Agreement.

         (d) Partial  Invalidity.  The  invalidity  or  unenforceability  of any
clause or part of this  Agreement or any other Loan  Documents  shall not affect
the validity or enforceability of any other clause or part hereof.

         (e)  Waiver.  Any  waiver by the Bank of any  breach or of any Event of
Default  shall not be deemed a waiver of any other breach or Event of Default of
the same or any other provision.

         (f) Rights Cumulative.  All of the Bank's rights,  remedies and powers,
whether  pursuant to this  Agreement  or any other Loan  Document  or  otherwise
("Rights")   shall  be  cumulative  and  may  be  exercised   independently   or
concurrently,  partially or wholly, and as often as the Bank deems expedient. No
delay or omission in exercising such Right or any other Right shall be construed
as a waiver  or  acquiescence  to an Event of  Default.  Waiver of a Right or an
Event of Default on any one occasion  shall not bar or be a waiver of such Right
or Event of Default on any future occasion.

         (g) Governing Law. This Agreement  shall be governed by the laws of the
State of New York.

         (h) Waiver Of Jury Trial. The parties hereto hereby waive trial by jury
in any  litigation in any court with respect to, in connection  with, or arising
out of this Agreement, any other Loan Document or the Loan, or any instrument or
document  delivered in connection  with the Loan,  or the validity,  protection,
interpretation, collection or enforcement thereof, or any other claim or dispute
howsoever arising between the Borrower and the Bank.

         (i)  Notices.  All notices  and  communications  under this  Agreement,
except those communications  permitted by the terms of this Agreement to be made
by telephone,  shall be: (i) personally delivered or (ii) forwarded by overnight
courier  service,  in each instance  addressed to the addresses  hereinafter set
forth,  or such other  addresses as the parties may for themselves  designate in
writing as provided herein for the purpose of receiving notices  hereunder.  All
notices shall be in writing and shall be deemed given,  in the case of notice by
personal  delivery,  upon actual  delivery,  and in the case of courier service,
upon delivery to the courier service as follows:






                  If to Bank:

                  KeyBank National Association
                  1377 Motor Parkway
                  Islandia, New York 11788
                  Attn:  James V. Maiorino, Vice President

                  If to Borrower:

                  Vicon Industries, Inc.
                  89 Arkay Boulevard
                  Hauppauge, New York 11788
                  Attn:  Kenneth M. Darby, President

         (j) Bank Approval. All Loan Documents and all other documents delivered
by Borrower to the Bank must be acceptable to the Bank and its Counsel.

         (k) Entire  Agreement.  This  Agreement  and the other  Loan  Documents
constitute  the  complete  agreement  of the parties with respect to the subject
matters   referred  to  herein  and  supersede  all  prior  or   contemporaneous
negotiations, promises, covenants, agreements or representations of every nature
whatsoever  with respect  thereto,  all of which have become  merged and finally
integrated  into this  Agreement.  Each of the parties  understands  that in the
event of any subsequent litigation, controversy or dispute concerning any of the
terms, conditions or provisions of this Agreement, neither shall be permitted to
offer or introduce any oral evidence  concerning any other oral promises or oral
agreements  between the parties relating to the subject matter of this Agreement
not included or referred to herein and not reflected by a writing  signed by the
Bank.

         (l)  Counterparts.  This Agreement may be executed in counterparts  and
any  combination  or  group  of  counterparts  bearing,  in the  aggregate,  the
signatures  of all of the  parties  hereto  shall be deemed  one  Agreement  and
sufficient execution of the within Agreement.






         IN WITNESS WHEREOF,  the parties have executed this Agreement as of the
day and year first above written.


VICON INDUSTRIES, INC.                      KEYBANK NATIONAL ASSOCIATION

By:____________________                     By:_________________________
         John Badke                         James V. Maiorino
         Vice President-Finance             Vice President


STATE OF NEW YORK   )
                    )  SS.:
COUNTY OF SUFFOLK   )

            On the  12th day of  October,  1999,  before  me,  the  undersigned,
personally  appeared JOHN BADKE,  personally  known to me or proved to me on the
basis of satisfactory  evidence to be the individual whose name is subscribed to
the within  instrument and  acknowledged  to me that he executed the same in his
capacity,  and that by his signature on the instrument,  the individual,  or the
person on behalf of which the individual acted, executed the instrument.


                                                           NOTARY

STATE OF NEW YORK   )
                    )  SS.:
COUNTY OF SUFFOLK   )

            On the  12th day of  October,  1999,  before  me,  the  undersigned,
personally appeared JAMES V. MAIORINO, personally known to me or proved to me on
the basis of satisfactory evidence to be the individual whose name is subscribed
to the within instrument and acknowledged to me that he executed the same in his
capacity,  and that by his signature on the instrument,  the individual,  or the
person on behalf of which the individual acted, executed the instrument.


                                                           NOTARY









                                 SCHEDULE "A"

                        PRIOR LIENS, CLAIMS OR RIGHTS OF
                          OTHERS IN AND TO COLLATERAL



                          KEYBANK NATIONAL ASSOCIATION