Maintenance and Service 8-15
Error M e ssages a n d T r ouble s h ooting
The table below provides basic information on the errors generated by the
Model 3772/3771 CPC, and suggestions for corrective action.
When an error occurs, the status LED on the front panel of the CPC turns
off. Status parameters can provide information for troubleshooting the
error. On the 3772/3771, the RIE firmware command will list instrument
errors. On the 3772, in addition, refer to the Status Screen for status errors
(see Figure 4-8). An exclamation mark will appear next to the parameter
which is out of range. For both CPCs, refer to the table below to help
identify the problem.
When called upon to remove the cover for service in the troubleshooting
table, follow instructions below:
1. Read warnings and cautions at the beginning of this chapter.
2. Unplug the instrument and remove the instrument cover screws before
lifting off the cover.
Table 8-2
Troubleshooting
Concentration out of
range
Concentration is higher than 10
4
particles/cm
3
Concentration entering the CPC is too high.
Dilute the aerosol before it enters the CPC.
Saturator temp out of
range
Saturator temperature out of
range ~±0.5 degrees C.
Warm up is not complete, instrument is operating in an
environment outside its specified operating range (10 to
35 C), or instrument was removed recently from a
temperature extreme.
Place instrument in an appropriate environment, allow
temperature to stabilize.
Condenser temp out of
range
Condenser temperature out of
range ~±0.5 degrees C.
Warm up is not complete, instrument is operating in an
environment outside its specified operating range (10 to
35 C), instrument was removed recently from a
temperature extreme, or fan flow is impaired.
Place instrument in an appropriate environment, allow
temperature to stabilize. Clean or replace fan filter,
remove object blocking fan flow
Optics temperature out of range
±2 degrees C.
Warm up is not complete, instrument is operating in an
environment outside its specified operating range (10 to
35 C), or instrument was removed recently from a
temperature extreme.
Place instrument in an appropriate environment, allow
temperature to stabilize.
Nozzle or orifice
pressure getting near
to out of range; aerosol
flow rate getting near
to out of range –
Indicated by a ‘?’
instead of a ‘!’ on the
display.
The orifice and/or nozzle flow is
getting close to being out of
range. This uses tighter criteria
than the “Nozzle or orifice
pressure out of range” condition
described in the next row, so it is
a warning and not an error.
Apply sufficient external vacuum.
Contact a TSI service technician.
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