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Teledyne ML - T100 UV Fluorescence SO2 Analyzer
8.3.7. PERFORMING A SAMPLE FLOW CHECK
IMPORTANT
8.3.8. HYDROCARBON SCRUBBER (
8.3.8.1. CHECKING THE SCRUBBER FOR LEAKS
Use a separate, calibrated flow meter capable of measuring flows between 0 and 1000
cm³/min to measure the gas flow rate though the analyzer. For this procedure, do not
refer to the built in flow measurement shown in the front panel display screen.
Sample flow checks are useful for monitoring the actual flow of the instrument, to
monitor drift of the internal flow measurement. A decreasing, actual sample flow may
point to slowly clogging pneumatic paths, most likely critical flow orifices or sintered
filters. To perform a sample flow check:
1. Disconnect the sample inlet tubing from the rear panel SAMPLE port (Figure 3-4).
2. Attach the outlet port of a flow meter to the sample inlet port on the rear panel.
Ensure that the inlet to the flow meter is at atmospheric pressure.
3. The sample flow measured with the external flow meter should be 650 cm³/min
10%.
4. Low flows indicate blockage somewhere in the pneumatic pathway. Refer to
troubleshooting Section 10.3 for more information on how to fix this.
There are two possible types of problems that can occur with the scrubber: pneumatic
leaks and contamination that ruins the inner tube's ability to absorb hydrocarbons.
Leaks in the outer tubing of the scrubber can be found using the procedure described in
Section 8.3.6. Use the following method to determine if a leak exists in the inner tubing
of the scrubber.
This procedure requires a pressurized source of air (chemical composition is
unimportant) capable of supplying up to 15 psiA and a leak checking fixture such as the
one illustrated in Figure 8-3.
TO SCRUBBER
Figure 8-3: Simple Leak Check Fixture
1. Turn off the analyzer.
06807A(DCNxxxx)
)
KICKER
Vacuum/Pressure
Gauge
Manual Shut-Off
Valve
Instrument Maintenance
Needle Valve
FROM PUMP or
PRESSURIZED
AIR SOURCE
219
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