Teledyne T300, Operation Manual, Page: 269 / 426

Teledyne API – Model T300/T300M CO Analyzer Troubleshooting and Service
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12.2.
GAS FLOW PROBLEMS
When troubleshooting flow problems, it is a good idea to first confirm that the actual
flow and not the analyzer’s flow sensor and software are in error, or the flow meter is in
error. Use an independent flow meter to perform a flow check as described in Section
11.3.4. If this test shows the flow to be correct, check the pressure sensors as described
in Section 12.5.7.6.
The T300/T300M has one main gas flow path. With the IZS or zero/span valve option
installed, there are several subsidiary paths but none of those are displayed on the front
panel or stored by the DAS.
With the O
2
sensor option installed, third gas flow controlled with a critical flow orifice
is added, but this flow is not measured or reported.
In general, flow problems can be divided into three categories:
1. Flow is too high
2. Flow is greater than zero, but is too low, and/or unstable
3. Flow is zero (no flow)
When troubleshooting flow problems, it is crucial to confirm the actual flow rate without
relying on the analyzer’s flow display. The use of an independent, external flow meter
to perform a flow check as described in Section 11.3.4 is essential.
The flow diagrams found in a variety of locations within this manual depicting the
T300/T300M in its standard configuration and with options installed can help in trouble-
shooting flow problems. For your convenience they are collected here.
06864B DCN6314