VICI D-4-I - Manual (Page 22)

18
Checking for Leaks in the Discharge Gas Plumbing
Leaks can be detected with hydrogen. A small lecture bottle of hydrogen
with a regulated flow of 10-15 mL/min through a small outlet tube is all that
is required. (This method can only be used to detect leaks on the discharge
gas side of the plumbing and between the column and detector inlet.)
1. Make sure the controller is in its un-zeroed condition. (Refer to the
discussion about the ZERO push button on page 7.)
2. Hold the hydrogen outlet tube at a fitting connection for ten seconds
while monitoring the standing current display on the controller.
3. If the current remains the same, proceed to the next fitting. If the current
increases, there is a leak at that connection. Tighten the fitting and test
it again, repeating as necessary until there is no change in the standing
current.
4. Repeat the test for every fitting in the discharge gas plumbing.
5. Reinstall the column according to the instruction on page 14. When the
standing current reaches an acceptable level, the detector is ready for
use. Proceed to the next chapter, “Mode Selection and Setup”. If the
current stays high, use this method to check for leaks at the column/
detector connection.
Column Bakeout Precautions
To prevent detector contamination, we strongly recommend disconnecting
the column from the detector during column bakeout procedures.
When the column in reinstalled after bakeout (refer to page 14 if necessary),
the standing current should be at an acceptable level. If you have exhaust-
ed these troubleshooting methods and the standing current is still high,
consult the factory.
Installation