Maintaining a Valve 15
Maintaining Your GC 281
12 Plumb the new valve using the existing fittings.
13 Turn on the carrier and sample gases, then check for leaks at
the valve fittings.
• Using the needle-nosed pliers to toggle the valve, check
both the On and Off positions.
• When leak free, set the valve to Off (see step 11).
14 Install the upper valve box assembly. (See “To Install the
Upper Valve Box” on page 284.)
15 Restore the analytical method.
16 Reset the valve EMF counters. See To Reset an EMF Counter
in the Operation Manual.
Valve rotor index pin
Valve stop Off position
WARNING
Hazardous sample gases may be present.
1. Sample in
5. Carrier gas in
4. Column
2. Sample out
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