No Or Low Reagent Gas Signal - HP 5973 MSD Hardware Manual

No or low reagent gas signal

Possible Cause
If you have just installed the CI ion source, and have an air leak or large amounts of
water in the system, and have run one or more autotunes, the ion source is probably
dirty now.
Action
Fix the air leak.
Clean the ion source. Then bake out for 8 hours before tuning. See the
Maintenance chapter in this manual for more information.
Possible Cause
The wrong reagent gas is flowing.
Action Turn on the correct reagent gas for your tune file.
Possible Cause
Ion polarity is set to
Action
Switch to
Possible Cause The reagent gas flow is set too low.
Action Increase the reagent gas flow.
Possible Cause
Reagent gas supply tubing is blocked, kinked, pinched, or disconnected.
Action
Inspect and, if necessary, repair or replace the reagent gas supply tubing.
Possible Cause Wrong filament wires are connected to filament.
Action
Make sure that the filament 1 wires are connected to the CI ion source filament and
that the filament 2 wires are connected to the dummy filament.
Possible Cause
Carbon has built up on the filament, or filament has sagged out of alignment.
Action Inspect the filament. If necessary, replace the filament.
Negative . No reagent gas ions are formed in NCI.
ionization mode.
Positive
 Troubleshooting
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