VICI D-4-I-TQ-R - Manual (Page 20)

16
High Noise Level
If the noise lievel is high:
1. See if it improves with the GC fan turned off.
2. Check the column insertion position (14.5 cm for capillary columns,
13.0 cm for packed columns.)
3. If the noise level is still high, do a hydrogen leak test, described below.
4. If there are no leaks found, or leaks are found and repaired and the noise
level is still high, consult Valco.
Performing a Hydrogen Leak Test
A hydrogen leak test allows you to pinpoint loose fittings and leaks inside
the detector.
1. Connect a length of plastic tubing to a regulated hydrogen bottle.
Establish a flow of 5-10 ml/min.
2. Hold the hydrogen outlet tube at a fitting connection for ten seconds while
monitoring the baseline.
3. Tighten the fitting and test it again, repeating as necessary until every
connection has passed the ten second test.
4. If the current remains high, hold the hydrogen outlet close to the detector.
(Do not insert the tube into any detector holes.) If a leak in the detector is
indicated, contact Valco.
NOTE: This method may also be used to test for leaks in other parts of the
system, but remember – a leak upstream from the column will not cause an
immediate baseline change. There must be time allowed for the hydrogen to
pass through the column.
Troubleshooting