Heath Consultants Optical Methane Detector (OM) - Manual (Page 12)

12
I
NSTALLATION
Appendix A at the end of this manual. Many vehicles have
vents below the bumper to allow airflow into the engine com-
partment. This is a good place for the optical path. If you
attach the OMD crossbar at bumper height, then hang the
optical path slightly below the bumper and gas will flow across
the optical path then on into the engine compartment.
The best location for your OMD crossbar assembly will vary
from vehicle to vehicle. However, one principle remains the
same, install the crossbar in such a way as to allow gas to
freely flow across the optical path.
Power box installation:
The original suggestion was if the vehicle had sufficient room,
that the Power Box should be mounted under the hood. This
reasoning was to eliminate the need for routing multiple cables
into the vehicle cab. However, field experience indicates that
in some instances, heat from the vehicle engine coupled with
high ambient temperatures can result in Power Box failures.
The current suggestion is to mount the Power Box inside the
cab of the vehicle. The first thing to consider when mounting
the power box inside the cab is cable length. The standard
cables are at least long enough to mount the power box directly
behind the front seat on most vehicles. If you desire to mount
it further back, check the length from the desired mounting
position to the OMD crossbar assembly mounted in front of the
front bumper.
After determining where you want to mount your power box,
simply place the box in the desired spot and mark through the
mounting holes on the ears of the box with a pencil. Drill
starter holes, then attach the box with four # 8 x ½” sheet metal
screws.