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8
Troubleshooting and Maintenance
This analyzer is designed to be maintenance and trouble free. However should problems occur
due to process conditions or other factors, use this chapter for troubleshooting purposes. If the
encountered circumstances are not discussed in this manual please contact Phymetrix. Spare
parts may be ordered through Phymetrix.
8.1
Cleaning
The analyzer enclosure may be cleaned using a moist cloth.
The flow control orifice of the PLMaEx can be removed and cleaned with solvents.
The sensor is not user serviceable and should not be cleaned by the user. If it is contaminated
please acquire an RMA and send the analyzer for repair.
8.2
Self Diagnostics
The analyzer constantly performs self diagnostics to determine if all parts are operating properly.
The results of the diagnostics are communicated based on the alarm selection settings of HART
command #15. The factory default is that a fault will cause the current to go to its high value
(20mA).
8.3
Suspected Erroneous Measurements
Some of the most common suspected erroneous conditions are listed in the following table
included are common reasons and suggested remedies.
If the measurement is suspected to be erroneous, before calling for support, it may be helpful to
have the following information:
Type of gas being measured.
Expected dewpoint.
Nominal pressure (consider back pressure).
Nominal temperature.
Nominal flow rate though the analyzer.
Flow diagram or description of system, showing items and their materials of construction.
Include materials of filer elements, regulator diaphragms, and valve seats.
Possible contaminants (particulates, liquids, oil, glycol, cleaning solutions, etc.).
Are the pipes and analyzer purged before measuring? How long? Flow rate? With the
same gas that will be measured?
If other equipment was used to verify the dewpoint, what is the equipment (include
model number)? What is its specified measuring range? When was it last
calibrated/certified?
If using bottled gas for reference: Manufacturer? Content and accuracy markings? What
is the pressure in the bottle at time of comparison? What is the ambient temperature
where the bottle is stored? What are the materials of construction of the pressure
regulator, especially the diaphragm?