General Troubleshooting & Service Teledyne API T703/T703U Calibrator Operation Manual
176
Cannot Zero 8.5.1.5.
Check for leaks in the pneumatic system as described in Section 7.2.
Confirm that the Zero gas is free of Ozone.
The photometer needs 800 cc
3
/min of gas flow. Make sure that this is
accounted for when calculating total required output flow for the calibrator (see
Section 3.4.7).
Cannot Span 8.5.1.6.
Check for leaks in the pneumatic systems as described in Section 7.2.
Check for proper operation of the meas/ref switching valve as described in
Section 8.5.2.
Check for dirty absorption cell and clean or replace as necessary as
described in Section 7.2
Check for operation of the A/D circuitry on the motherboard. See Section
8.4.9.1.
Confirm the Sample Temperature, Sample Pressure and Sample Flow
readings are correct. Check and adjust as required.
The photometer needs 800 cc
3
/min of gas flow. Make sure that this is
accounted for when calculating total required output flow for the calibrator
(see Section 3.4.7).
CHECKING MEASURE / REFERENCE VALVE 8.5.2.
To check the function of the photometer‟s measure / reference valve:
1. Set the calibrator‟s front panel display to show the PHOTO REFERENCE test
function (see Section 4.1).
2. Follow the instructions in Sections 6.1.1 and 6.1.3.1 for performing a zero
point calibration of the photometer.
Press XZRO and allow the calibrator to stabilize.
3. Before completing the calibration by pressing the ZERO button, note of the
displayed value.
4. Press the final Zero button, then press “NO” when asked, “ARE YOU SURE”.
5. Follow the instructions in Section 6.1.3.2 for performing a span point
calibration of the photometer.
Press XSPN and allow the calibrator to stabilize.
6. Before completing the calibration by pressing the SPAN button, note of the
displayed value of PHOTO REF.
If the O
3
REF value has decreased by more than 2 mV from its value
with Zero-gas, then there is a "cross-port" leak in the m/r valve.
7. Press the final Zero button then press “NO” when asked, “ARE YOU SURE”.
8.6. TROUBLE SHOOTING THE O
3
GENERATOR
Troubleshooting the O
3
generator differs between the T703 (Section 8.6.1) and
the T703U (Section 8.6.2).
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