Heath Consultants Optical Methane Detector (OM) - Manual (Page 30)

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Receiver Alignment:
Next, remove the paper and clear the light path of all obstacles.
Observe the “LIGHT LEVEL” on the display. The alignment
screws on the Receiver are used to optimize the light level as
observed on the Display. Adjust the receiver alignment screws
until the light level reaches its most negative number. This last
step directs the optical beam through the optical components of
the Receiver to the Detector. Be sure to tighten all nuts on
lamp and receiver after alignment.
LIGHT
LEVEL
-746.2
-756.5
-767.1
-777.4
-786.8
Push
Display
To Exit
A
LIGNMENT