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TP1 Sample Temp 30
o
C=2.5 V, ±.125 V/
o
C
TP2 Optical Bench 50
o
C=2.5 V, ±.125 V/
o
C
TP3 Filter Wheel Temp 50
o
C=2.5 V, ±.125 V/
o
C
TP4 Chassis Temp 20
o
C=2.5 V, ±.125 V/
o
C
If any of these voltages is incorrect, check thermistor operation as described in Section
10.6.2. If thermistors are operating correctly, it is probable the DC Power Supply Board
is defective and should be replaced.
10.6.5 Checking the pneumatic sensor board
A schematic and physical diagram of the Pneumatic Sensor Board are shown on
Drawings 402 and 403 in Appendix C. Proper operation of the pneumatic sensor board
can best be determined by comparing the values of Flow and Pressure Test functions to
measurements obtained with independent flow and pressure meters. Flow and pressure
readings can be adjusted as described in Section 9.5.
If it is not possible to adjust the pneumatic sensor board to agree with independent flow
and pressure measurements, confirm the presence of +15V at connector J1 pin 6. If this
voltage is not present, check the DC Power Supply Board as described in Section 10.6.4.
If +15V is present, it is probable that the Pneumatic Sensor Board is defective and should
be replaced.
10.6.6 Checking the Synchronous Demodulator Board
A schematic and physical diagrams of the Synchronous Demodulator Board are shown in
drawings 798 and 799 in Appendix C.
Proper operation of the Synchronous Demodulator can best be confirmed by performing
the Electric Test Diagnostic as described in Section 5.2.4.
When activated, the Electric Test Diagnostic should produce a constant, stable analyzer
output of approximately 50 ppm. If this stable output is produced it is probably that the
Synchronous Demodulator is functioning properly.
If Electric Test does not produce a stable output, check the following:
1. Confirm proper operation of the V/F Board as described in Section 10.6.3.
2. Confirm that during Electric Test the values of the CO MEAS and CO
REF test functions are between 2500mV and 4500mV. If they are not,
adjust the signal levels by turning Pot R7 on the Synchronous
Demodulator Board.
P/N 02163G1 Teledyne API Model 300 CO Analyzer Instruction Manual - Page 96