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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
10.3.6 Reaction Cell Temp
The reaction cell temperature is controlled by the CPU using advanced algorithm to control
constant temperature. It operates by reading a thermistor amplifier on the 01086 Status/Temp
board. First LED from the front indicates the control power on-off status which can be seen from
the cover of the PSM through the slot. A warning message is often present during initial warm-
up due to the temperature being below the 50.0°C set point.
10.3.7 Preamp Board
The Preamp Board is a multifunction board providing circuitry to support the following
functions.
1. Preamp, buffer amplifier, physical range control hardware for the PMT detector.
2. Precision voltage reference and voltage generation, and control for the PMT - HVPS inside
the sensor module.
3. Constant current generator and adjustment for the Optic Test LED.
4. Voltage generation and adjustment for Electric Test.
5. Thermistor amplifier and temperature control circuit for the PMT cooler.
The setup and adjustment of items 1-4 above is covered in the Factory Calibration procedure in
Section 10.1.6. Item 5 (see Section 10.3.9) is not adjustable.
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