Flow Check; No Response To Sample Gas - Teledyne 6400A Instruction Manual

TAI Model 6400A SO

9.2.2 Flow Check

1. Check TEST function SAMP FLOW - Should be 650 ± 65cc/min.
2. Check that pump is running. Observe pump for proper operation.
3. Test that pump is producing vacuum by removing fitting at the inlet of the pump and
checking for suction at fitting.
4. Check for flow at the reaction cell.
A. Remove the 1/8" fitting from the reaction cell and plug the fitting on the reaction cell
with your finger and note the weak vacuum produced.
B. Using independent flow meter verify the flow rate into the reaction cell. It should be
about same as the TEST function SAMP FLOW reading. If not within the range, then
flow sensor is out of adjustment or broken (see Section 9.3.6).
5. Check instrument inlet flow using separate flow meter and compare the flow rate to the
SAMP FLOW reading. If the flow is lower than expected flow, then leak check the analyzer
as described in Section 8.8.
6. If there is no leak and all above procedures can not correct flow rate reading, then replace the
flow meter (see Figure 9-6).

9.2.3 No Response to Sample Gas

Confirm general operation of analyzer.
A. Check for AC Power, Section 9.2.1.
B. Do flow checks, Section 9.2.2.
C. Confirm that sample gas contains SO
Check instrument electronics.
A. Do ELEC TEST procedure in DIAGNOSTIC menu Section 9.1.3.2.
B. Do OPTIC TEST procedure in the DIAGNOSTIC menu Section 9.1.3.3.
C. Check if UV LAMP reading of TEST function is greater than 350mV.
If the 6400A passes ET and OT that means the instrument is capable of detecting light and
processing the signal to produce a reading. Therefore, the problem is most likely in the
pneumatics.
Analyzer Operator Manual, 02164, Rev. G
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