Figure 5-1: Probe Leakage Paths, Bottom View
A. Corrugated seal
B. Reference air exhaust port
C. Probe head
D. Probe flange gasket
The sensing cell is bolted to the end of the probe and uses a corrugated metallic seal
(Item 25,
).
3. This seal can only be used one time, so always replace this seal when replacing a
cell. Always apply anti-seize compound on both sides of the corrugations.
5.7
Probe passes calibration, but still appears to
read too low
Potential cause
The diffusion element at the end of the probe is a passive filter. It plugs very slowly since
there is no active flow being drawn across it. In applications that have a heavy particulate
loading (coal or wood fired boilers, cement and lime kilns, catalyst regeneration, recover
boilers, etc.) the diffusion element will eventually plug. This may cause a calibration shift.
Recommended actions
1. Do not pressurize the sensing cell during calibrations by flowing excessive cal gas
against a plugged diffuser.
2. Only set calibration flow rates when a new diffuser is installed.
3. As the diffuser plugs, do not adjust the flow rates upward.
Reference Manual
Troubleshoot
00809-0100-4880
October 2019
Rosemount Oxymitter DR
71
Summary of Contents for Rosemount Oxymitter DR
Page 4: ...4 ...
Page 52: ...Startup and operate Reference Manual October 2019 00809 0100 4880 52 Emerson com Rosemount ...
Page 72: ...Troubleshoot Reference Manual October 2019 00809 0100 4880 72 Emerson com Rosemount ...
Page 74: ...Return material Reference Manual October 2019 00809 0100 4880 74 Emerson com Rosemount ...
Page 84: ...Replacement parts Reference Manual October 2019 00809 0100 4880 84 Emerson com Rosemount ...