Noisy Or Unstable O Readings At Zero; Noisy, Unstable, Or Non-Linear Span O; Slow Response To Changes In Concentration; Readings - Teledyne T750 User Manual

Noisy or Unstable O
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Noisy, Unstable, or Non-Linear Span O

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Slow Response to Changes in Concentration

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The Analog Output Signal Level Does Not Agree With Display
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Cannot Zero

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150
Readings at Zero
3
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.
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.
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
The photometer needs 800 cc
accounted for when calculating total required output flow for the calibrator (see
Section 2.5.5).

Readings

Confirm that the recorder offset (see Section 3.3.9.2) is set to zero.
Perform an Analog Output calibration (see Section 3.3.9.3).
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
accounted for when calculating total required output flow for the calibrator (see
Section 2.5.5).
Readings
3
3 /min of gas flow. Make sure that this is
3 /min of gas flow. Make sure that this is
083730750B DCN8606