Troubleshooting Unexpected Readings - Teledyne 8800T Instruction Manual

• Do not install any devices upstream of the sensor, such
as other measuring systems, flow meters etc., which are
not absolutely necessary as these are potential leak
sources.
• Installation of a coalescing and / or particulate filter
ahead of the sensor is desirable to prevent any liquid or
particulate contamination of the sensor.
• 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. The two should be the same; if they are not, the
instrument may not be calibrated with the installed sensor.
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.
Section 2: Sensor and Sampling Techniques
page 9