4 troubleshooting unexpected readings – COSA Xentaur Xentaur HDT User Manual
Page 16
Section 2: Sensor and Sampling Techniques
page 9
•
If filters are used upstream of the sensor, make sure
these contain non-hygroscopic filter materials only.
•
If pressure regulators, shut off valves etc. are used
upstream of the sensor, make sure these do not contain
rubber or other hygroscopic materials.
2.4 Troubleshooting unexpected readings
If erroneous readings are suspected on a newly acquired
instrument, compare the serial number engraved on the sen-
sor sintered filter, to the one stored in the instrument mem-
ory. This comparison can be performed utilizing a HART
communicator. The two should be the same; if they are not,
the instrument may not be calibrated with the installed sen-
sor. To troubleshoot other problems, identify the unexpected
reading category in the following table, and consider the
possible causes and appropriate diagnostic action and rem-
edy.