3-10 Model 3775 Condensation Particle Counter
saturator wick. See “User Settings” in Chapter 4 and “Maintenance”
in Chapter 8.
Pressure Transducers
The Model 3775 CPC uses three pressure transducers for
monitoring instrument flows. The differential pressure across the
Critical Orifice is measured to verify that a critical pressure is
maintained across the orifice. Differential pressure across the
nozzle is measured and verifies the nozzle in the optics block is free
from obstruction. The ambient pressure is also measured. These
pressure transducers are mounted to the main PC board. Pressure
information is provided on the Status screen.
Electronics Boards
Five electronics boards identified in Figure 3-6, are used in the
Model 3775. The boards include Main PC board, laser board,
detector board, communication connector board, and flash memory
board.
Figure 3-6
Electronics Boards Inside the Model 3775 CPC
1. Main PC board 4. Communication connector board
2. Detector board 5. Flash memory board
3. Laser board
1
2
3
4
5
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