4-1
C H A P T E R 4
Instrument Operation
This chapter describes the basic operation of the Model 3772/3771
Condensation Particle Counter (CPC) and provides information on the use
of controls, indicators, and connectors found on the front and back panels.
Opera t i n g Preca u t i o ns
Read the following before applying power to the 3772/3771 CPC:
Review the operating specifications for the CPC in Appendix A.
Do not operate the CPC outside the range of 10 to 35 C. If the CPC is
operated outside this range, the displayed concentration may be
inaccurate.
If the CPC reservoir contains butanol, be very careful when moving the
CPC. Refer to “Moving and Shipping the CPC” for more details.
W A R N I N G
Although the Condensation Particle Counter is appropriate for monitoring
inert process gases such as nitrogen or argon, it should not be used with
hazardous gases such as hydrogen or oxygen. Using the CPC with
hazardous gases may cause injury to personnel and damage to equipment.
Power S w i tch
The power switch is found on the back panel of the CPC. The switch is
combined with the power cord receptacle.
Warm - up
When the CPC is turned on, the saturator, condenser, and optics have to
reach set operating temperatures. This “warm-up interval” takes about 10
minutes at room temperature. The Status LED indicator on the front panel
will remain unlit during this time. Under extremes in ambient temperature, it
may take considerably longer for the instrument to warm-up.
On the 3772 front panel display, a countdown is also displayed during the
warm-up time, as shown in Figure 4-1.
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