Manuals / Teledyne / Household Appliance / Carbon Monoxide Alarm

Teledyne 300 Checking the pneumatic sensor board, Checking the Synchronous Demodulator Board

Models: 300

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TP1 Sample Temp

30oC=2.5 V, ±.125 V/oC

TP2 Optical Bench

50oC=2.5 V, ±.125 V/oC

TP3 Filter Wheel Temp

50oC=2.5 V, ±.125 V/oC

TP4 Chassis Temp

20oC=2.5 V, ±.125 V/oC

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

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Teledyne 300 instruction manual Checking the pneumatic sensor board, Checking the Synchronous Demodulator Board
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FAQ

How can I check the pneumatic sensor board?

You can check the pneumatic sensor board by comparing the values of Flow and Pressure Test functions to measurements obtained with independent flow and pressure meters. Further details can be found in Section 10.6.5 of the instruction manual.

What should I do if the Synchronous Demodulator does not produce a stable output during Electric Test?

If the Synchronous Demodulator does not produce a stable output, you should first confirm the proper operation of the V/F Board as described in Section 10.6.3. Other steps are outlined in the manual under Section 10.6.6.

How do I adjust the signal levels for the CO MEAS and CO REF test functions?

You can adjust the signal levels by turning Pot R7 on the Synchronous Demodulator Board. Specific details can be found in the instruction manual on page 96.