Maintaining the NPD 11
Maintaining Your GC 229
25 Install the J-clamp and screws to secure the electrometer to
the pallet.
26 Install the bead assembly and restore normal operating
conditions. (See “To Replace the NPD Bead Assembly” on
page 219.) (Do not reset the bead counter unless replaced.)
After installing new collector parts, the NPD leakage current
should be lower. (See “To Check the NPD Leakage Current”
on page 230.) If the leakage current is abnormal, check for
proper reassembly of the detector (especially where the
electrometer interconnect contacts the collector assembly)
and for leaks.
27 Reset the EMF counters. See To Reset an EMF Counter in the
Operation Manual.
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