Heath Consultants Optical Methane Detector (OM) - Manual (Page 29)

29
A
LIGNMENT
Then, the alignment screws on the Receiver are used to optimize the
light level as observed on the Display. This last step directs the
optical beam through the optical components of the Receiver to the
Detector.
Place a piece of tracing paper in front of the receiver input lens
and you will be able to see the rectangular shaped light beam
projected onto the lens as well as the outline of the lens itself. If
this light beam is not projecting onto the receiver lens at its cen-
ter, adjust the alignment screws on the back of the light source
until it is.