Heath Consultants Optical Methane Detector (OM) - Manual (Page 42)

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II. Equipment Requirements
A. A vehicle for the terrain to be surveyed should be used. It
should have good visibility and maneuverability and must
be equipped with safety lights.
B. Combustible Gas Indicator
C. Plunger Bar
D. Report Forms
E. Other - as needed
III. Method of Operation
A. Maintenance of Instruments
Each OMD utilized for leak detection and evaluation
will be operated in accordance with the manufacturers
recommended operating instructions and the following
maintenance procedures will be performed:
1. The light path should be checked for dirt build-up at
the beginning of each day. If necessary clean with a
cotton rag, soap and water.
2. The OMD will be periodically “checked” while in
use to insure that it is responding to methane gas by
pressing the “CALIBRATION/TEST” button.
B. Calibration of Instrument
The functionality should be periodically “checked” by
pressing the “CALIBRATION/TEST” button. If the
OMD is suspected to be out of calibration it should be
verified with an external calibration cell. If the OMD™
is verified to be out of calibration, it must be re-cali-
brated.
C. Survey Procedures
The consultant drives along those areas to be surveyed
placing the light path of the OMD just above the soil or
pavement surface. While conducting a mobile survey
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