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Teledyne API Model T360/T360M Operation Manual Troubleshooting and Service
235
8.2. GAS FLOW PROBLEMS
The T360 has two main gas flow path, the sample gas flow path and the GFC
purge gas flow path. Both are controlled by a critical flow orifice. Only the
sample gas path is measured and reported. When the IZS or zero/span valve
options are 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:
Flow is too high
Flow is greater than zero, but is too low, and/or unstable
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 6.3.4 is
essential. If this test shows the flow to be correct, check the pressure sensors as
described in Section 8.5.
7.5.
The flow diagrams
provided in this manual depicting the T360 in its standard
configuration and with options installed can help in trouble-shooting flow
problems. For your convenience they are collected here.
07272B DCN6552