Flowserve NRGT26-1 - Manual (Page 20)

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.