TSI Instruments SIZER 3321, User Manual

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B-1
A P P E N D I X B
T r o u b l e s h o o t i n g
This appendix lists potential problems and their solutions.
Note : If none of the solutions provided corrects the problem, call your TSI
representative for advice.
Table B-1
Troubleshooting Symptoms and Recommendations
Symptoms Recommendations
The pumps do not come on when the
instrument is powered up Check to see that the pumps are turned on from the front panel menu.
Rotate the control knob all the way clockwise until the menu button is shown. Press
the control knob in so that the menu appears.
Rotate the knob to scroll the cursor down the menu until the pumps item is
highlighted.
Press the control knob to toggle the pumps on and off.
Exit the menu.
If the pumps are off when you exit the menu, the APS
™ spectrometer will not start
them on power-up. If they are on when you exit the menu, they will turn on when
the APS
™ spectrometer is powered up.
The pumps do not control the flows to
the proper flow rates or the flows are
erratic Check for blockage in the flow path:
The outlet in the back panel may be blocked or covered. Check and clear any
obstruction.
The inner or outer nozzle may be dirty or clogged. See Appendix A, “
Maintenance
.”
The filters may be clogged. See Appendix A,
“
Maintenance
.”
The HI CONC (High concentration)
warning light is illuminated The HI CONC LED is an indicator that the concentration of aerosol that the
instrument is sampling is too high for the APS
™ spectrometer to accurately
measure. The LED is lit when the concentration exceeds 1000 particles/cm
3
.
Although the APS
™ spectrometer can measure aerosols at concentrations greater
than this value, concentration errors due to coincidence will increase and some of
the particles will not be counted. To correct this problem, reduce the concentration
of the sampled aerosol (by mixing filtered air with the sample, for instance) or use
one or two diluters (TSI Model 3302A) with the APS
™ spectrometer.