To Replace A Gas Sampling Valve Loop - Agilent Technologies 8860 Maintaining

15 Maintaining a Valve

To Replace a Gas Sampling Valve Loop

To Replace a Gas Sampling Valve Loop

1 Gather the following:
2 Place GC in maintenance mode: Maintenance > Instrument > Perform Maintenance >
3 Turn off the detector.
The oven, inlet, detector, and valve box may be very hot.
WAR N IN G
Sample and/or harmful gases may be present. Refer to your company's standard operating
procedures for purging the chemicals from the sample line.
4 Set all valve box valves to Off.
5 Leave on the GC and valve actuator air.
6 Turn off the carrier gas and sample line flows and relieve any back pressure to the valve.
The valve box insulation is made of refractory ceramic fibers (RCFs). To avoid inhaling RCF
WAR N IN G
particles, we recommend these safety procedures:
• Ventilate your work area
• Wear long sleeves, gloves, safety glasses, and a disposable dust/mist respirator
• Dispose of insulation in a sealed plastic bag
• Vacuum any residual particles and discard
• Wash your hands with mild soap and cold water after handling RCFs.
7 Remove the upper valve box. See
8 Vacuum any loose particulate insulation.
9 When the valve is cool, loosen the sample loop's two 1/4-inch fittings on the valve head
230
• Replacement sample loop, see
• 1/4-inch wrench
• Vacuum cleaner
Maintenance Mode > Start Maintenance. Wait for the GC to become ready.
and remove the loop.
"Consumables and Parts for Valves"
"To Remove the Upper Valve Box"
Sample loop
on page 228.
on page 236.
Maintaining Your GC