4–2 AEROTRAK™ Remote Airborne Particle Counters
Do not touch any area on the laser bench marked High Voltage and do
not touch any part of the laser tube or any part extending from the laser
tube.
After the instrument has been allowed to warm up, the following
procedure can be used to clean the laser window (located next to
the laser tube) and the external mirror (located at the back of the
sensor).
Cleaning Procedure
Cleaning Tips
• A vacuum line, with a shut off valve in line, should be connected to the
vacuum connection on the back panel. This assists in keeping the optics
clean.
• Never turn on the vacuum when a cleaning port is removed from the block of
the instrument. This will further contaminate the optics.
1. Turn the power off to the instrument and remove any
attachments to the inlet.
2. Attach a zero count filter onto the inlet. Turn the instrument
back on and apply a vacuum for approximately 20 to 30
seconds. Turn the vacuum off, but leave the power on.
3. Attach a DVM positive lead to the LVREF test point at the
back of the instrument. Attach the ground lead of the DVM to
the Chassis ground at the back of the instrument. This will
give the current reading of the laser reference voltage. The
original voltage can be found on a label on the back panel. If
measured LVREF is less than 50% of the original value, the
service light is on. The optics may require cleaning even if the
service light is not on.
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