8-14 Model 3772/3771 Condensation Particle Counter
Calibr a t i o n Remind e r
TSI recommends yearly calibrations for your CPC. Ten months after the
instrument’s last calibration, a series of periodic reminders are generated
to notify the user that a yearly recalibration is due soon. These reminders
come in two forms: a message appears on the screen (3772 only) and an
error bit is set which is seen with the RIE firmware command. The
message and bit will remain until cleared by either of these two methods:
pressing a front panel key (3772 only), or sending the SCCR firmware
command. After this, the reminder remains cleared until either another one
is generated in several days, or the last reminder is given, or the unit is
recalibrated. Be aware this is only a reminder and will not affect the
operation of your instrument in any way, even if it is not recalibrated.
Although not necessary, if you wish to check the instrument’s last
calibration date or reminder status, use the SCD firmware command, which
is explained in the appendix.
False C o u n t Check
If you find that the CPC is continually counting a lot of particles even with a
high efficiency (HEPA or ULPA) filter on the inlet, the CPC may have
developed a leak or the aerosol flow path may have become contaminated
with butanol.
To eliminate the possibility of butanol contamination, follow the directions
for “Correcting Flooded Optics” in this chapter. If the false count problem
continues, it is most likely due to a leak. If the wick has recently been
replaced, confirm that the aerosol inlet is secured on the front panel.
If the false count problem continues, return the CPC to TSI for service.
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