| Gas Calibration outside recommended limits |
Possible Causes |
Action Required |
| NO gas concentration low due to absorption in regulator |
Allow cal gas to flow for at least 5 minutes before calibrating |
| Cal gas flow rate too low(no flow out open leg of tee) |
Increase cal gas flow rate to > 250 mL/min |
| Dirty/clogged frit restrictor |
Clean or replace the frit restrictor |
| Dirty filter |
Replace Teflon filter in gas sampling line |
| Dirty Reaction chamber |
Cleanreaction chamber |
| High voltage needs adjustment |
Contact GE Analytical Instruments |
| |
| Zero Air Calibration outside recommended limits |
Possible Causes |
Action Required |
| Leak at zero air filter |
Confirm all connections are tight |
| No flow through zero air filter |
Insure caps are removed from both ends of zero air filter. |
| Light Leak |
See PMT test in Detector Problems troubleshooting section. |
| Cooler Temperature too high |
Allow at least 30 minutes after turning power on before calibrating. |
| Perform cooler maintenance if necessary. |
| |
| High Background after NO calibration |
| Possible Causes |
Action Required |
| Dirty Teflon filter |
Replace the filter |
