• Move the meter.
14.22 Check for leakage
Leakage can cause process problems and inaccurate readings.
Tip
Micro Motion recommends checking for leakage on a regular schedule.
Procedure
1. Check for a leak from the reference chamber to the atmosphere.
This can cause low primary variable readings.
a) Observe the reference chamber pressure reading. If this leak is present, the reference chamber
pressure will be low.
b) Apply a soap solution around the reference chamber valve and the fitting into the reference
chamber.
c) Watch for bubbles.
If you find a leak, you may be able to plug it. If you cannot resolve the problem, contact customer
service.
2. Check for a leaky diaphragm.
The diaphragm can allow leaks from the sample path into the reference chamber. This produces high
density readings.
a) Observe the reference chamber pressure reading. If this leak is present, the reference chamber
pressure will increase, and will eventually match line pressure.
Contact customer service.
3. Check for leaks in the pipework or fittings.
Leaks in the pipework or fittings will reduce input pressure. When the input pressure is too low to
create flow, the density reading will be low.
a) Apply a soap solution to all locations where you suspect leaking, including both internal and
external pipework.
b) Watch for bubbles.
If you find a leak, you may be able to plug it. If you cannot resolve the problem, contact customer
service.
14.23 Check the coalescing filter
For accurate measurement, the coalescing filter must be clean and functional.
Procedure
• Check the coalescing filter frequently for liquid or particulate contamination, and replace as needed.
Frequency of checking depends on the condition of the sample gas.
Configuration and Use Manual Troubleshooting
MMI-20020954 March 2021
Configuration and Use Manual 143
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