Checking The Pneumatic Sensor Board; Checking The Source Lamp And Detector - Teledyne 401 Instruction Manual

O3 calibrator

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Teledyne API Model 401 O

Four Temperature linearization circuits are contained on the DC Power Supply board. The

outputs of these circuits can be checked by measuring the voltages at test points on the board as

follows:

TP1

Sample Temp

TP2

Source Lamp Temp

TP3

IZS Lamp Temp

TP4

Chassis Temp

If any of these voltages is incorrect, check thermistor operation as described in Section 9.6.2. If

thermistors are operating correctly, it is probable the DC Power Supply Board is defective and

should be replaced.

9.6.5 Checking The Pneumatic Sensor Board

A schematic and physical diagram of the Pneumatic Sensor Board are shown on Drawings 00402

and 00403 in Appendix D. 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 8.5.

If it is not possible to adjust the pneumatic sensor board to agree with independent flow and

pressure measurements, confirm the presence of +15 V at connector J1 pin 6. If this voltage is

not present, check the DC Power Supply Board as described in Section 9.6.4. If +15 V is present,

it is probable that the Pneumatic Sensor Board is defective and should be replaced.

Basic operation of the source lamp and detector can be determined by observing the value of the

O3 REF test function. After the analyzer is warmed-up (15 min to 30 min after power-on), this

value will give a good indication of the state of Lamp and Detector operation as follows.

Photometric Calibrator Instruction Manual, 01124, Rev. J1

30 ° C=2.5V, ± 0.125V/ ° C

50 ° C=2.5V, ± 0.125V/ ° C

20 ° C=2.5V, ± 0.125V/ ° C

9-14

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