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April 2008
Diagnostic Record
Flowcell Problems
Gas Problems
3-4
Upon leaving the Diagnostic Menu via the
option on the option bar, the display screen will continue to show the
last diagnostic parameter that was selected. To return to normal
measurement mode, select a channel to display (for a 2-Channel
meter only) and then select the desired display parameter. See
Chapter 3, Operation, of the Startup Guide for detailed instructions.
The values for the diagnostic parameters immediately after initial
installation of the meter and verification of proper operation should
be entered in Table A-2 on page A-3. These values can then be
compared to future values to help diagnose any future malfunction of
the system.
If preliminary troubleshooting with the Error Code Messages and/or
the Diagnostic Menu indicates a possible flowcell problem, proceed
with this section. Flowcell problems fall into two categories:
•
gas problems
•
pipe problems.
Read the following sections carefully to determine if the problem is
indeed related to the flowcell. If the instructions in this section fail to
resolve the problem, contact the factory for assistance.
Most gas-related problems result from a failure to observe the
flowmeter system installation instructions, as described in the Startup
Guide. Refer to Chapter 1, Installation, of the Startup Guide to
correct any installation problems.
If the physical installation of the system meets the recommended
specifications, it is possible that the gas itself may be preventing
accurate flow rate measurements. The gas being measured must meet
the following requirements:
1. The gas must be homogeneous, single-phase and relatively clean.
Although a low level of entrained particles may have little effect
on the operation of the Model GC868, excessive amounts of solid
or liquid particles will absorb or disperse the ultrasound signals.
This interference with the ultrasound transmissions through the
gas will cause inaccurate flow rate measurements. In addition,
temperature gradients in the gas flow may result in erratic or
inaccurate flow rate readings.
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