Teledyne API T703/T703U Calibrator Operation Manual General Troubleshooting & Service
175
Since many photometer behaviors that appear to be a dynamic in nature are often
a symptom of a seemingly unrelated static problems, it is recommended that
dynamic problems not be addressed until all static problems, warning conditions
and subsystems have been checked and any problems found are resolved.
Once this has been accomplished, the following most common dynamic problems
should be checked.
Noisy or Unstable O
3
Readings at Zero 8.5.1.1.
Check for leaks in the pneumatic system as described in Section 7.2
Confirm that the Zero gas is free of Ozone.
Confirm that the Source Lamp is fully inserted and that the lamp hold-down
thumb- screw is tight.
Check for a dirty Absorption Cell and/or pneumatic lines. Clean as
necessary as described in Section 7.2
Disconnect the exhaust line from the optical bench (the pneumatic line at the
lamp end of the bench) and plug the port in the bench. If readings remain
noisy, the problem is in one of the electronic sections of the instrument. If
readings become quiet, the problem is in the instrument's pneumatics.
Noisy, Unstable, or Non-Linear Span O
3
Readings 8.5.1.2.
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.
Slow Response to Changes in Concentration 8.5.1.3.
Check for dirty absorption cell and clean or replace as necessary as
described in Section 7.2
Check for pneumatic leaks as described in Section 7.2
Check for improper materials in the inlet manifold.
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).
The Analog Output Signal Level Does Not Agree With Front Panel 8.5.1.4.
Readings
Confirm that the recorder offset (see Section 4.9.1.5) is set to zero.
Perform an AOUTS calibration (see Section 4.9.2) and photometer dark
calibration (see Section 6.1.4).
To Next Page