20
Operational Malfunctions
If faults occur that are not listed above, please contact our subsidiary or agency in your country.
Fault finding list for troubleshooting
Equipment fails to work
Fault:
Mains voltage has not been applied.
Remedy:
Apply mains voltage. Wire equipment according to the wiring diagram.
Fault:
The thermal fuse has been activated.
Remedy:
In case of a defective thermal fuse the mains voltage has not been applied to terminal
R
.
Replace defective thermal fuse (ref. no. 05629).
The ambient temperature must not exceed 70 °C.
Fault:
The electrode housing does not have earth connection to the vessel.
Remedy:
Clean seating surfaces and insert metal joint ring (of stainless steel .430) D 27 x 32 to
DIN 7603.
Do
not
insulate compact system with hemp or PTFE tape!
Fault:
Electronic board is defective.
Remedy:
Replace board (ref. no. 39360).
Equipment does not work accurately
Fault:
Electrode has been installed without protection tube.
The protection tube serves as reference electrode.
Remedy:
Install protection tube.
Fault:
The vent hole in the protection tube does not exist, is obstructed or flooded.
Remedy:
Check protection tube and, if necessary, provide vent hole.
Fault:
The isolating valves of the external measuring pot (optional) are closed.
Remedy:
Open isolating valves.
Fault:
The desired zero point does not lie within the measuring range of the electrode.
The electrode is too short.
Remedy:
Replace the compact system. Choose adequate electrode length.
Fault:
The adjustment of the measuring range is wrong.
Remedy:
Adjust switch
K
correctly. See
“Basic Adjustments“.
Fault:
Dirt deposits have accumulated on the electrode rod.
Remedy:
Remove compact system and clean electrode rod with a wet cloth.
Fault:
The gasket of the electrode rod is damaged.
Measuring current at terminal and 2
≥
20 mA.
Fig. 13
Remedy:
Replace compact system.
Summary of Contents for NRGT 26-1
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