202 Agilent 7890 Series Troubleshooting
8 Troubleshooting Tasks
To Check for a Plugged NPD Jet
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 Measuring NPD flows.) If the flows are
lower than the displayed values, replace the jet.
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