To Check For A Plugged Npd Jet - Agilent Technologies 7890 Series Troubleshooting Manual

8
Troubleshooting Tasks

To Check for a Plugged NPD Jet

202
The detector EPC module controls flow by maintaining a
calibrated gas pressure against a fixed restriction. A plugged jet
will cause inaccurate flow readings.
To check for a plugged NPD jet, measure the actual hydrogen
and makeup flows. (See
lower than the displayed values,
Measuring NPD flows.) If the flows are
replace the jet.
Agilent 7890 Series Troubleshooting