Exhibit
      31.1





CERTIFICATIONS





I,
      Robert
      S. Kendall, certify that:





1.
      I have
      reviewed this quarterly report on Form 10-QSB for the quarter ended February
      28,
      2007 of Sentex Sensing Technology, Inc.





2.
      Based
      on my knowledge, this report does not contain any untrue statement of a material
      fact or omit to state a material fact necessary to make the statements made,
      in
      light of the circunstances under which such statements were made, not misleading
      with respect to the period covered by this report.





3.
      Based
      on my knowledge, the financial statements, and other financial information
      included in this report, fairly present in all material respects the financial
      condition, results of operations and cash flows of the small business issuer
      as
      of, and for, the periods presented in this report.





4.
      The
      small business issuer’s other certifying offer(s) and I are responsible for
      establishing and maintaining disclosure controls and procedures (as defined
      in
      Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial
      reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f) for the
      small business issuer and have:





|a) | designed
              such disclosure controls and procedures, or caused such disclosure
              controls and procedures to be designed under our supervision, to ensure
              that material information relating to the small business issuer, including
              its consolidated subsidiaries, is made known to us by others within
              those
              entities, particularly during the period in which this report is being
              prepared;
|-- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------




|b) | designed
              such internal control over financial reporting, or caused such internal
              control over financial reporting to be designed under our supervision,
              to
              provide reasonable assurance regarding the reliability of financial
              reporting and the preparation of financial statements for external
              purposes in accordance with generally accepted accounting
              principles;
|-- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------




|c) | evaluated
              the effectiveness of the small business issuer’s disclosure controls and
              procedures and presented in this report our conclusions about the
              effectiveness of the disclosure controls and procedures, as of the
              end of
              the period covered by this report based on such evaluation;
              and
|-- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------




|d) | disclosed
              in this report any change in the small business issuer’s internal control
              over financial reporting that occurred during the small business issuer’s
              most recint fiscal quarter (the small business issuer’s fourth fiscal
              quarter in the case of an annual report) that has materially affected,
              or
              is reasonable like to materially affect, the small business issuer’s
              internal control over financial reporting;
              and
|-- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------




5.
      The
      small business issuer’s other certifying officer(s) and I have disclosed, based
      on our most recent evaluation of internal control over financial reporting,
      to
      the small business issuer’s auditors and the audit committee of the small
      business issuer’s board of directors (or persons performing the equivalent
      functions):





|a) | all
              significant deficiencies and material weaknesses in the design or
              operation of internal control over financial reporting which are
              reasonable likely to adversely affect the small business issuer’s ability
              to record, process, summarize and report financial information;
              and
|-- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------




|b) | any
              fraud, whether or not material, that involves management or other
              employees who have a significant role in the small business issuer’s
              internal control over financial
              reporting.
|-- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------




Date:
      April 20, 2007





/s/
      Robert S. Kendall, Chairman and Treasurer


Signature
      & Title