Heath Consultants Optical Methane Detector (OM) - Manual (Page 51)

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V. Transportation Requirements
Any vehicle designed for the terrain to be covered.
VI. Method of Operation
A. Maintenance of Instruments
Each instrument utilized for leak detection and evalua-
tion will be operated in accordance with the manufactur-
ers recommended operating instructions and the follow-
ing 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 instrument 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 calibration should be periodically “checked” by press-
ing 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-calibrated.
C. Survey Procedures (Regular Mobile Survey)
The survey is conducted by driving the unit along those
areas to be surveyed and passing the light path over the
most logical venting locations for gas leaking from be-
low ground. The survey is conducted at a speed slow
enough to allow an adequate sample to pass through the
light path, giving consideration to the location of the gas
facility and any adverse conditions that might exist.
S
URVEY