320 Nitrogen Phosphorus Detector (NPD)
Replacement procedures
20 of 32
Jun 2001
Detectors
Agilent 6890 Gas Chromatograph Service Manual
Figure 320-10 Removing the NPD electrometer
3. Loosen the three Torx T-10 screws on the lid weldment and remove the
lid.
4. Remove one Torx T-20 screw from each end of the electrometer. (You do
not need to remove the screw on the top of the electrometer that holds
the cover on.)
5. Unlock and detach the electrometer’s ribbon cable from the detector’s
interface board and lift the electrometer from the detector pallet.
6. Reassembly is the reverse of removal.
Removing an EPC flow manifold
WARNING Before proceeding, turn off the detector and any detector gases at their
supply. Then turn off the main power switch and unplug the power cord.
Early models of the 6890 GC used Type 1 EPC flow manifolds. Later models
use the Type 2 manifold. Both types are discussed here.
Lid weldment
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