Checking For Blockage - Agilent Technologies 8860 User Manual

6 Maintenance and Troubleshooting

Checking for Blockage

3 Check fittings and connections that undergo thermal cycling, since thermal cycling tends to
loosen some fitting types. Use the electronic leak detector to determine if a fitting is leaking.
• Start by checking any newly made connections first.
• Remember to check connections in the sample supply lines after changing filters, quick
For any visible connections and fittings, you can use an electronic leak detector to do the leak
check.
To Check for Gasifier Leaks
1 Power off the Gasifier.
2 Connecting a N
3 Disconnect Gasifier from GC.
4 End capping the Gasifier vent outlet and sample outlet.
5 Performing a pressure drop test:
• Set the N
• Fully turn the regulator pressure adjustment knob counterclockwise to shut the valve.
• Wait 10 min. If there is a pressure loss greater than 7 kPa (1 psi), there is a leak within the
If there is gasifier internal leak, you should send the gasifier to Agilent Repair Center.
Checking for Blockage
1 Gather the following:
• 7/16-in, 9/16-in, and 1/4-in wrenches for tightening Swagelok fittings
• End caps
2 Power off the Gasifier.
3 Remove any installed filter.
4 Connecting a N
5 Disconnect Gasifier from GC.
6 End capping the Gasifier vent outlet and transfer line outlet.
7 Set the N
8 Remove the Gasifier transfer line outlet end cap, adjust the sample flow control needle valve.
The output flow should be able to increase to larger than 500 mL/min. If there is no flow at all,
the gasifier has a serious blockage, send the gasifier to Agilent for service. If the flow can be
increased but cannot reach 500 mL/min, the gasifier may have a moderate blockage issue.
Try purging the system using maximum flow for 15 to 30 minutes to see if the blockage issue
can be eliminated, otherwise send the gasifier to Agilent for service.
9 End cap the Gasifier transfer line outlet, remove the Gasifier vent outlet end cap, adjust the
vent flow control needle valve. Repeat
10 If there is no blockage in either the transfer line or vent line, the blockage may be caused by the
filter. Change to a new or clean filter prior to analysis afterwards.
54
connectors or supply cylinders.
or Air cylinder to the Gasifier.
2
or Air cylinder regulator pressure to 415 kPa (60 psi).
2
gasifier.
or Air cylinder to the Gasifier.
2
or Air cylinder regulator pressure to 415 kPa (60 psi).
2
step 8 to evaluate the vent line blockage issue.
Agilent 8860, 8890, and 990 Micro GC Gasifier User Manual