Appendix A: Troubleshooting
Page A-2
Lasair II Particle Counter Operations Manual
When starting the particle counter, the software generates an audible tone to
indicate a successful startup check. The lack of a tone means the Lasair II particle
counter startup was not successful. Press the OFF button and then try restarting the
Lasair II particle counter with the ON button. If you are still unable to get a tone,
call Instrument Service and Support.
D. The display is backlit, but there is nothing on the display.
First, try turning the particle counter off and then on again. If the problem persists,
your Lasair II particle counter software may be corrupted. Call Instrument Service
and Support.
E. The sample is invalid because the airflow is not 1 cubic foot per minute (1
CFM).
Try the following steps:
1
Run the sample again. The low airflow problem usually is self-correcting.
2
If the problem does not correct itself, test your power source.
3
If the power source appears to be adequate, look for obstructions in the Lasair II
particle counter’s intake port, exhaust port, and sample tubing. Remove any
obstructions that you find.
4
If there are no obstructions, call Instrument Service and Support.
F. Sampling is stopped because of pump flow error.
This can be caused by the following conditions:
•
pump over-current failure. If the pump draws too much current, it will shut
down causing sampling to terminate.
•
flow controller cannot control the flow to 1 CFM for 60 seconds or longer.
This may be caused by a blocked inlet port or a damaged pump. In a manifold
system, the displayed value is typically less than 1 CFM, but the software uses
an internal value. More information about Lasair II particle counter flow with
a manifold can be found in the
AM-II Operator’s Manual
.
•
a hardware error on the circuit board while attempting to read pressure and
flow data
Try the following:
1
Rebooting the instrument.
2
If rebooting the instrument fails to correct the problem, call Particle Measuring
Systems Service.
