TSI Instruments AEROTRAK 7201-A2F - Page 37

5-1
C H A P T E R 5
Troubleshooting
The chapter contains suggestions for troubleshooting common issues
with the AeroTrak
®
Remote Airborne Particle Counters.
Symptom
Possible Cause
Corrective Action
Instrument does not
power up -
Power/Service LED is
off (should be green)
24 VDC has not been
applied to the correct
pins as indicated by the
pin out diagram.
Apply 24 VDC to pins
number 1 and 2,
according to the pin out
diagram.
Power/Service LED is
yellow indicating a flow
error
Vacuum line may be
disconnected, blocked,
or kinked.
Check vacuum line to
make sure it is
connected, unblocked
and not kinked.
Inlet may be plugged.
Remove any
obstructions from inlet.
Vacuum level may be
below minimum
requirements for flow.
Use a vacuum gauge to
make sure vacuum at
outlet of particle
counter is at least
15 inHg.
Critical orifice may be
blocked.
Contact service.
Power/Service LED is
red indicating a service
error
Instrument may require
routine service due to a
laser error, scatter
error.
Check service required
date on calibration
label. Arrange for
service if required.
Internal instrument
error.
Contact service.
Counting LED is off
This is normal if
counting is disabled.
Use software to enable
counting.
Instrument does not
meet zero count
specification (<1
particle/5 mins)
May require cleaning.
Contact service.
An internal component
has become damaged
due to operation
outside specifications.
Contact service.
The zero filter is not
connected properly and
room air is leaking into
the HEPA filter
assembly.
Check that the rubber
O-ring on the inlet of
the instrument has not
become dislodged.
Check that the zero
filter is screwed tight.