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Troubleshooting and Service Teledyne API – Model T700 Dynamic Dilution Calibrator
266
9.5.1.2. Noisy, Unstable, or Non-Linear Span O
3
Readings
Check for leaks in the pneumatic systems as described in Section 8.2.1.
Check for proper operation of the meas/ref switching valve as described in Section
9.5.2.
Che
ck for dirty absorption cell and clean or replace as necessary as described in
Section 8.2.2.
Che
ck for operation of the A/D circuitry on the motherboard. See Section 9.4.11.1.
Confirm the Sample Tem
perature, Sample Pressure and Sample Flow readings are
correct. Check and adjust as required.
9.5.1.3. Slow Response to Changes in Concentration
Check for dirty absorption cell and clean or replace as necessary as described in
Section 8.2.2.
Che
ck for pneumatic leaks as described in Section 8.2.1.
The photo
meter needs 800 cm
3
/min of gas flow. Ensure that this is accounted for
when calculating total required output flow for the calibrator (see Section 3.4.9).
9.5.1.4. The Analog Output Signal Level Does Not Agree With Front Panel Readings
Confirm that the recorder offset (see Section 4.10.1.5) is set to zero.
Perform an AIO calibration (see Section 4.10.1.6) and photometer
dark calibration
(see Section 7.3.5).
9.5.1.5. Cannot Zero
Check for leaks in the pneumatic system as described in Section 8.2.1.
Confirm that the Zero gas is free of Ozone.
The photometer needs 800 cm
3
/min of gas flow. Ensure that this is accounted for
when calculating total required output flow for the calibrator (see Section 3.4.9).
9.5.1.6. Cannot Span
Check for leaks in the pneumatic systems as described in Section 8.2.1.
Check for proper operation of the meas/ref switching valve as described in
Section9.5.2.
Che
ck for dirty absorption cell and clean or replace as necessary as described in
Section 8.2.2.
Che
ck for operation of the A/D circuitry on the motherboard. See Section 9.4.11.1.
Confirm the Sample Tem
perature, Sample Pressure and Sample Flow readings are
correct. Check and adjust as required.
The photometer needs 800 cm
3
/min of gas flow. Ensure that this is accounted for
when calculating total required output flow for the calibrator (see Section 3.4.9).
06873B DCN6388