Cleaning and Maintenance
44
Cleaning Optics
Cleaning the optics is a necessary part of periodic routine maintenance. The amount
of time between cleaning the optics will depend a lot on how dirty the vehicles under
test are and how frequent the OmiSmoke is used. The OmiSmoke will automatically
inform the user when the optic signal is below recommended limits which will normally
indicate that the optics will need cleaning.
The optics consist of a transmitter LED and a receiver LED, these are mounted on
small PCB’s within the end covers –
See Introduction section
.
This cleaning procedure is the most critical for your Smoke meter and should be
carried out on a clean bench and should be carried out by a competent technician.
1.
Remove screws from end face of optics covers – these are usually socket screws
of 2 different sizes.
2.
Locate the LED mounted in the centre of the PCB facing the smoke chamber –
it is situated between 2 hexagonal mounts.
Note: Be very careful not to knock this assembly as optical alignment is critical
for normal operation.
3.
Using a cotton bud clean the domed lens of the LED removing black soot. If the
surface is particularly contaminated, the cotton bud can be moistened in tap
water to remove soot and then dried off with a clean dry cotton bud to finish.
Note: DO NOT use solvents to clean LEDs.
4.
Before replacing cover, check that the PCB and its mounts have not been
knocked or have come loose. If you suspect they have DO NOT tighten the
assembly – report to service help desk as these fixings are tightened to a torque
limit.
5.
Replace cover carefully ensuring seal is in place around perimeter.
6.
Tighten fixing screws. Ensure both halves of cover create a good seal to prevent
light and water ingress.
Important: It is advised that a linearity test is performed after cleaning optics to
ensure operation and calibration are correct.
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