Teledyne 100AH instruction manual Status/Temp Board, Temperature Amplifier Section, 10-38

Teledyne API Model 100AH SO2 Analyzer Instruction Manual, 02417, Rev. D

10.3.3 Status/Temp Board

The Status/Temp Board is a multifunction board that:

1.Converts the resistance readings of the thermistors to voltages

2.Provides status output circuitry

3.Provides circuitry for contact closure inputs

4.Provides circuitry for display brown-out/reset at low line voltage

5.Provides sockets for voltage-to-current modules

10.3.3.1 Temperature Amplifier Section

The Status/Temp board (01086) is a multifunction board consisting of 4 thermistor amplifiers that monitor:

1.Spare

2.Reaction Cell temperature

3.Box temperature

4.Spare

The voltages of the thermistor and thermocouple amplifier outputs are brought out to test points on the edge of the board. Refer to the schematic 01086 for details. The voltages can also be read using the DIAGNOSTIC - SIGNAL I/O feature (see Table 10-4for details).

Thermistor Temperature Amplifier Adjustments

The Status/Temp board has 3 thermistor temperature amplifiers:

1.Reaction Cell Temperature

2.Spare

3.Box temperature readout

These 3 outputs are controlled by a common pot (R34) on the upper edge of the card.

If the temperature readouts are in error:

1.Adjust R34 of the Status/Temp board to read 2.577 VDC between test point 6 and test point 2.

2.This will cause all of the readouts to accurately measure their respective temperatures.

10-38