Flowserve NRS 1-7 - Manual (Page 17)

17
Operational Malfunctions
Fault-finding list for troubleshooting
Electrode submerged – low-level alarm
Fault: The level switch indicates a low-level alarm before the level in the boiler has fallen below
the low level mark.
Remedy: Check length of electrode tip. Measure the conductivity of the process or boiler water and
compare the values obtained with the marking on the name plate. Check correct wiring of
level switch and electrode in accordance with wiring diagram, Fig. 10, Fig. 11.
Fault: After raising the water level above the low-level mark, the two red LEDs 2 are not
extinguished or only after quite a considerable period.
Remedy: Check whether a vent hole has been provided in the protection tube. If the electrode is
fitted in a measuring pot outside the boiler, check position of isolating valves.
Fault: One or both red LEDs 2 light up without the level having fallen below the low-level mark.
Remedy: This means electronic failure within the level switch, i. e. failure of one or two of the
channels. Replace level switch.
Low-level reached – no function
Fault: The water level falls below the low-level mark but neither of the two red LEDs 2 lights
up.
Remedy: Check whether a vent hole has been provided in the protection tube. If the electrode is
fitted in a measuring pot outside the boiler, check position of isolating valves.
Fault: The testing with the switch “TEST 2/ INSPECTION” 1 was not successful, i. e. only one
red LED 2 or none of the two lighted up at the latest two minutes after the start of the
test.
Remedy: Replace level switch.
Operation
Application in steam and (pressurized) hot water boilers in accordance with TRD 401, TRD 602, TRD
604, EN 12952, EN 12953 or in accordance with national regulations.
Water-level alarm
Note
■ For troubleshooting consult section “Operational Malfunctions” on pages 17/18.
If faults occur that are not listed above, please contact our Technical Services or agency in your
country.