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Troubleshooting & Repair Teledyne API - Model 200EH/EM Operation Manual
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11.2. GAS FLOW PROBLEMS
The M200EH/EM has two main flow paths, the sample flow and the flow of the ozone supply air. With IZS or
zero/span valve option installed, there is a third (zero air) and a fourth (span gas) flow path, but either one of
those is only controlled by critical flow orifices and not displayed on the front panel or stored to the iDAS. The
full flow diagrams of the standard configuration and with options installed (Appendix D, document 04574) help in
trouble-shooting flow problems. 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 essential 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 6.13.7.5 is essential.
The flow dia
grams found in a variety locations within this man
ual depicting the M200EH and M200EM in their
standard configuration and with options installed can help in trouble-shooting flow problems. For your
convenience they are colleted here in Sections 11.2.1 (M200EH) and 11.2.2 (M200EM)
11.2.1. M200EH INTERNAL GAS FLOW DIAGRAMS
Figure 11-5: M200EH – Basic Internal Gas Flow
04521C (DCN5731)