EXHIBIT 10.40


                          CONSULTING SERVICES AGREEMENT

         THIS CONSULTING  SERVICES  AGREEMENT (the "AGREEMENT")  entered into on
September ___, 2001, (hereinafter the "EFFECTIVE DATE"), by and between CELERITY
SYSTEMS,  INC., a Delaware  corporation (the "COMPANY"),  and YORKVILLE ADVISORS
MANAGEMENT, LLC, a Delaware limited liability company (the "CONSULTANT").

         Company  desires to retain the services of Consultant as an independent
contractor to provide certain consulting and advisory services designated below,
and  Consultant  desires to accept such  engagement by Company,  pursuant to the
terms and conditions of this Agreement.

         In consideration of the representations,  warranties,  mutual covenants
and agreements set forth herein, the parties agree as follows:

         1.   SCOPE OF SERVICES

              a.  DUTIES AND  PERFORMANCE.  From time to time during the term of
this Agreement,  Consultant shall provide such advisory services relating to the
Company's  financial status and capital structure (the "SERVICES") to Company as
Consultant and Company shall agree. In connection with the Services,  Consultant
may develop and  communicate  to Company  certain  business  opportunities  with
entities  known  to  Consultant;  the  Services  may  include  various  types of
arrangements, including direct investment into Company.

              b.  INDEPENDENT   CONTRACTOR   STATUS.   The  parties  agree  that
Consultant is an independent contractor performing Services hereunder and not an
employee of Company.  Consultant  may use  contractors or other third parties of
Consultant's  choice to assist  Consultant in rendering  such  Services.  Unless
otherwise  agreed by Company in writing,  Consultant  shall be  responsible  for
payment of all  compensation  or expenses  payable or reimbursable to such third
parties.  Nothing herein or in the performance hereof shall imply either a joint
venture or  principal  and agent  relationship  between the  parties,  nor shall
either such relationship be deemed to have arisen under this Agreement.

         2.   COMPENSATION AND EXPENSES

              A. FINDER'S FEE; NOT A BROKER.  For the services described herein,
Company  shall pay the  Consultant  a cash fee a of $184,800.

              b.  EXPENSE  REIMBURSEMENT.  While  this  Agreement  is in effect,
Company shall pay for or reimburse  Consultant  for all  reasonable and itemized
business expenses incurred by Consultant  directly related to the services to be
performed by Consultant under this Agreement. Consultant shall keep accurate and
detailed records of such expenses and submit expense reports along with relevant
documentation  in accordance with the expense  reimbursement  policy of Company.
Company  shall pay or  reimburse  Consultant  for all  reasonable  out-of-pocket
expenses  actually  incurred or paid by  Consultant  in the course of performing




services as required hereunder;  PROVIDED, that any individual expense in excess
of five hundred dollars ($500.00) must be approved in advance by Company.

              c. NON-CIRCUMVENTION. Company represents and warrants that Company
shall  take no  action  which  shall  result  in  Company  and  any  third-party
introduced to Company,  directly or  indirectly,  by Consultant  consummating  a
relationship  or  transaction  with  Company  without  the   participation   and
compensation of Consultant.  In the event  Consultant  brings an action or seeks
counsel to  enforce  the  provisions  of this  Section  2(c),  Company  shall be
responsible for all fees and expenses incurred by Consultant  including fees and
expenses of any appeal or collection of any judgment.

         3.   INDEMNIFICATION

         EXHIBIT  A  attached  hereto  and made a part  hereof  sets  forth  the
understanding of the parties with respect to the indemnification and exculpation
of Consultant.  The  provisions of EXHIBIT A shall  survive,  and remain in full
force and effect after, the termination of this Agreement until fully performed.

         4.   TERM AND TERMINATION

         The initial term of this Agreement shall be for a period  commencing on
the Effective Date hereof and ending on the second (2nd) year anniversary of the
date of this Agreement.  Either party may terminate this Agreement without cause
or  without  the  necessity  of  specifying  cause by giving  written  notice of
termination  to the  other  party.  This  Agreement  shall  terminate  upon  its
expiration or upon receipt of this notice of termination by the  non-terminating
party.  Notwithstanding  the termination of this Agreement,  Sections 2, 3 and 5
shall continue in force and effect and shall survive any such termination.

         5.   MISCELLANEOUS

              a. NOTICE. All notices and other communications hereunder shall be
in writing and delivered by Federal  Express or any other  generally  recognized
overnight delivery service,  or by hand, to the appropriate party at the address
on record or to such other address as a party indicates in a notice to the other
party delivered in accordance with this Section.

              b.  SEVERABILITY.  Should one or more provisions of this Agreement
be held unenforceable, for whatever cause, the validity of the remainder of this
Agreement shall remain unaffected.  The parties shall, in such event, attempt in
good faith to agree on new  provisions  which best  correspond  to the object of
this Agreement.

              c. ENTIRE AGREEMENT.  The parties have entered into this Agreement
after  negotiations  and  discussions,  an  examination  of  its  text,  and  an
opportunity  to  consult   counsel.   This  Agreement   constitutes  the  entire
understanding  between the parties  regarding to specific subject matter covered
herein. This Agreement supersedes any and all prior written or oral contracts or
understandings  between the parties  hereto and neither  party shall be bound by
any  statements  or  representations  made by either  party not embodied in this
Agreement.  No provisions herein contained shall be waived, modified or altered,
except by an instrument in writing, duly executed by the parties hereto.

                                       2


              d.  GOVERNING  LAW.  This  Agreement  shall  be  governed  by  and
construed in accordance  with the laws of the State of New York,  without giving
effect to any choice of law of conflict of law  provision  or rule  whether such
provision  or rule is that of New York or any  other  jurisdiction.  Each  party
irrevocably  consents to the exclusive  personal  jurisdiction of New York State
courts situated in the county in which Consultant is located in New York, or the
United  States  District  Court,  or  the  Southern  District  of New  York,  in
connection  with any action,  suit or  proceeding  relating to or arising out of
this Agreement or any of the transactions or relationships  contemplated hereby.
Each party, to the maximum extent  permitted by law, hereby waives any objection
that  such  party may now have or  hereafter  have to the  jurisdiction  of such
courts on the basis of inconvenient forum or otherwise.  Each party waives trial
by jury in any proceeding that may arise with respect to this Agreement.

              e. NO IMPLIED  WAIVERS.  No delay or omission  by either  party to
exercise its rights and remedies in connection with the breach or default of the
other shall operate as or be construed as a waiver of such rights or remedies as
to any subsequent breach.

              f.  COUNTERPARTS.  This Agreement may be executed in any number of
counterparts,  but all  counterparts  hereof shall  together  constitute but one
agreement.  In proving this  Agreement,  it shall not be necessary to produce or
account for more than one counterpart signed by both of the parties.

              g. BINDING NATURE.  This Agreement shall be binding upon and shall
inure to the benefit of the successors and assigns of the respective  parties to
this Agreement.

              h.  CAPACITY.  Company  represents to Consultant  that each person
signing this  Agreement on its behalf has the full right and authority to do so,
and to perform its obligations under this Agreement.

              i.  ATTORNEYS'  FEES.  In the  event  of any  litigation  or other
proceeding  arising out of or in connection with this Agreement,  the prevailing
party or parties shall be entitled to recover its or their reasonable attorneys'
fees and court costs from the other party or parties.

              j. CAPTIONS. The captions appearing in this Agreement are inserted
only as a matter of convenience and for reference and in no way define, limit or
describe the scope and intent of this Agreement or any of the provisions hereof.

3







         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the Effective Date.

YORKVILLE ADVISORS                               CELERITY SYSTEMS, INC.
MANAGEMENT, LLC
By:                                              By:
      ----------------------------------            ----------------------------
Name:                                            Name:  Kenneth D. Van Meter
      ----------------------------------
Title:                                           Title: President
      ----------------------------------



                                       4


                                    EXHIBIT A
                                    ---------

         The Company will  indemnify  and hold harmless the  Consultant  and its
affiliates  and  their  respective  directors,  members,  officers,  agents  and
employees  and  each  other  person  controlling  the  Consultant  or any of its
affiliates  for any losses (i)  related to or arising out of (A) oral or written
information  provided  by  the  Company  to  the  Consultant,  the  Consultant's
employees  or other  agents or (B) any other  action  or  failure  to act by the
Consultant,  its members,  officers, agents or employees or by the Consultant or
any other  indemnified  party at the  Company's  request  or with the  Company's
consent,  or  otherwise  related to or arising  out of the  consulting  services
provided  or  to be  provided  by  the  Consultant  under  this  Agreement  (the
"ENGAGEMENT") or any transaction or conduct in connection therewith, except that
this  clause  (ii) shall not apply with  respect to any losses  that are finally
judicially  determined  to have  resulted  from the gross  negligence or willful
misconduct of such indemnified party.

         If the foregoing  indemnity is unavailable to any indemnified party for
any reason,  the Company will contribute to any losses related to or arising out
of the  Engagement  or any  transaction  or conduct in  connection  therewith as
follows.  With respect to such losses referred to in clause (i) of the preceding
paragraph,  each of the  Company and the  Consultant  shall  contribute  in such
proportion  as is  appropriate  to reflect the  relative  benefits  received (or
anticipated  to be  received)  by the  Consultant  on the one  hand,  and by the
Company and its security holders, on the other hand, from the actual or proposed
transaction arising in connection with the Engagement. With respect to any other
losses,  and for losses referred to in clause (i) of the preceding  paragraph if
the allocation provided by the immediately preceding sentence is unavailable for
any reason,  each of the Company and the  Consultant  shall  contribute  in such
proportion as is  appropriate  to reflect not only the relative  benefits as set
forth above,  but also the relative fault of each the Company and the Consultant
in connection with the actions, omissions or other conduct that resulted in such
losses,  as  well  as any  other  relevant  equitable  considerations.  Benefits
received (or anticipated to be received) by the Company and its security holders
shall be deemed to be equal to the  aggregate  cash  consideration  and value of
securities or any other property payable, issuable, exchangeable or transferable
in such  transaction  or  proposed  transaction,  and  benefits  received by the
Consultant shall be deemed to be equal to the  compensation  paid by the Company
to the Consultant in connection  with the Engagement  (exclusive of amounts paid
for  reimbursement  of expenses or paid under this  Agreement).  Relative  fault
shall be determined  by reference  to, among other  things,  whether any alleged
untrue statement of omission or any other alleged conduct relates to information
provided  by the  Company or other  conduct  by the  Company  (or the  Company's
employees or other agents), on the one hand, or by the Consultant,  on the other
hand. The parties agree that it would not be just and equitable if  contribution
were determined by pro rata allocation or by any other method of allocation that
does not  take  account  of the  equitable  considerations  referred  to  above.
Notwithstanding anything to the contrary above, in no event shall the Consultant
be  responsible  for any  amounts  in excess of the  amount of the  compensation
actually paid by the Company to the Consultant in connection with the Engagement
(exclusive  of amounts  paid for  reimbursement  of  expenses or paid under this
Agreement).

                                      A-1




         The Company agrees that it will not,  without prior written  consent of
the Consultant,  settle any pending or threatened claim or proceeding related to
or arising out of the Engagement or any actual or proposed transactions or other
conduct  in  connection   therewith  (whether  or  not  the  Consultant  or  any
indemnified party is a party to such claim or proceeding) unless such settlement
includes a provision  unconditionally  releasing the  Consultant  and each other
indemnified  party from,  and holding all such  persons  harmless  against,  all
liability in respect of claims by any releasing  party related to or arising out
of the Engagement or any  transactions or conduct in connection  therewith.  The
Company will also promptly  reimburse  each  indemnified  party for all expenses
(including  counsel fees and expenses) as they are incurred by such  indemnified
party in connection with investigating,  preparing for, defending,  or providing
evidence in, any pending or threatened claim or proceeding related to or arising
out of the engagement or any actual or proposed  transaction or other conduct in
connection  therewith  or  otherwise  in  respect  of which  indemnification  or
contribution may be sought hereunder (whether or not the Consultant or any other
indemnified  party is a party to such claim or  proceeding) or in enforcing this
Agreement.

         The  Company  further  agrees  that the  Consultant  shall not have any
liability (whether direct or indirect,  in contract or tort or otherwise) to the
Company or any of the Company's affiliates, creditors or security holders for or
in  connection  with the  Engagement or any actual or proposed  transactions  or
other conduct in connection  therewith except for losses incurred by the Company
that  are  finally  judicially  determined  to  have  resulted  from  the  gross
negligence or willful misconduct of the Consultant.

         The  provisions  set forth above shall  remain in full force and effect
and shall survive the completion or termination of the Engagement.


                                       A-2