Heathus OMD, Manual

Page: 11 / 60

11
I
NSTALLATION
is not flat, some other type of brackets, supports, etc. will need
to be used to attach the strut channels to the front of the ve-
hicle. Mount the two strut channels approx. one-foot from the
ground to the bottom of each strut channel. A drawing is
included in Appendix A.
Once the strut channels are mounted, use standard strut chan-
nel shelf brackets (Heath P/N 2510654) to mount to the strut
channels with two bolts (Heath P/N 2510655) and channel-nuts
(Heath P/N 2510653) each. The OMD crossbar can then be
attached to the shelf brackets with the insulated u-bolts pro-
vided (Heath P/N 2510657).
Once this installation is complete, the height of the OMD can
easily be adjusted by loosening the bolts attaching the shelf
brackets to the strut channel and sliding the OMD up or down
to the desired position. In addition, the shelf brackets can be
mounted facing upward so that the OMD can be extended
another 10” up toward the hood. The shelf brackets can also
be mounted downward so that the OMD can be extended
another 10” down toward the ground.
Additional Notes On Crossbar Installation:
One of the most important points to consider when installing
the crossbar assembly is air- flow. Unlike the flame ionization
technology, which has a vacuum pump to bring the sample to
the analyzer, the OMD relies strictly on the flow of gas through
the optical path. Therefore, it is of the utmost importance that
you install the OMD in such a way as to allow the gas to flow
continuously through the optical path. It is important that you
don’t configure your mounting brackets in a way that creates a
dead space thus preventing gas from flowing freely across the
optical path. A drawing illustrating this problem is included in