CHAPTER 7
Calibrating the CPC
7-1
This chapter gives a description of the calibration methods used by
TSI to calibrate the Model 3022A Condensation Particle Counter
(CPC).
In the realtime and live-time, single-particle-counting modes (below
10,000 particles/cm
3
), no calibration is required except for
flowrate. The particle concentration is simply calculated from the
flowrate, time, and number of particles that pass through the
sensing chamber.
Figure 7-1 shows the setup for calibrating in the photometric
calibration mode, the Model 3022A Condensation Particle Counter
(CPC) is calibrated according to two different methods. From 10,000
to about 500,000 particles/cm
3
, the standard method used is an
electrostatic mobility classifier and an aerosol electrometer. For
details of this calibration procedure, see Appendix C.
Model 3074
Clean Air
Supply
Compressed
Air
35 psi
Model 3076
Constant Output
Atomizer
Model 3062
Diffusion Dryer
Model 3012
Aerosol Neutralizer
Sheath
Air In
Excess
Air
Monodisperse
Aerosol Out
Polydisperse
Aerosol
Model
3071
Electrostatic
Classifier
Model 3022A
Condensation
Particle Counter
Filter
Valve
Valve
Model 3068
Aerosol Electrometer
Model 3708
Flow Splitter
Exhaust
Vacuum
Concentration
Adjustment
Figure 7-1
Calibration of the Condensation Particle Counter
To Next Page
Loading...
Need help?
General
