Thermo Scientific Nanopure Analytical 1367 Series Operating Manual And Parts List page 57

Section 13
Troubleshooting
Problem
Purity display continuously
"OVERRANGE."
Display reads, "Overpressure
Error."
Display reads, "Meter Board
Problem."
Water is leaking between the
manifold and the cartridge
pack.
Water is leaking at atmos-
pheric drain connection
13-2 Nanopure™ Analytical
Possible Causes
Poor quality feed water.
Air in system.
Bad cell connection.
Incorrect N.I.S.T. calibration
offset.
0.2 micron filter clogged.
PC board communication error. Turn the Nanopure OFF (I/O Switch) and restart the unit.
System electronics failure.
Wing head screws are not
tight enough.
New cartridge pack: o-ring
missing from post (each of the
4 posts must contain an o-
ring.)
Tubing not fully inserted.
Solutions
If a ROpure is the feed water source, check that the membrane is functioning
properly.
If a Still is the feed water source, ensure that the distillate temperature to the
NANOpure does not exceed 40°C (104°F).
If feed water is from a central water purification system, verify water quality
and proper functioning of the system. See "General Specifications."
Dispense more water through the Nanopure to purge air from the unit.
Check the connection of the cell as it attaches to the meter circuit board
mounted on the inside of the right door.
If you have a N.I.S.T. module, perform a N.I.S.T. calibration.
If you do not have a N.I.S.T. module, perform the calibration function WITHOUT
the calibration module (as if you had it; answer (YES) to prompt. The display
will read "Calibration (failed)" but this will clear any incorrect offset to zero.
Replace final filter as indicated in "0.2 Micron Filter Replacement."
Replace the resistivity meter board mounted on the inside of the right door.
Tighten wing head screws on unit manifold.
Disconnect inlet water and depressurize system. Next, disconnect
the manifold and verify/replace missing o-ring. Reinstall cartridge pack as
indicated in "Cartridge Pack Replacement."
Insert tubing into connection until it bottoms out.
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