Flowserve NRG211-1 Level Probe - Manual (Page 19)

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Fault: Defective temperature sensor.
Remedy: Check the measuring voltage across terminals 2 and 3 of NRG 211-1.
If the supply voltage 1 – 4 V check temperature sensor. If temperature
sensor is defective replace level probe.
Level switch NRS 2-5: No function when level falls or rises or when level is
below min. level – only the green LED
OPERATION
of the level switch NRS 2-5 is
illuminated
Fault: Level probe does not enter the liquid.
Remedy: Measure voltage across C18/A18 of NRS 2-5. Check installation of
NRG 211-1 and measure voltage across terminals 2 and 3. If necessary
change position of installation of the level probe.
Fault: Defective level switch.
Remedy: Measure voltage across C16/A18 (supply voltage for level probe) on
NRS 2-5. Replace level switch if no voltage can be measured.
Fault: Defective preamplifier.
Remedy: Measure voltage across C18/A18 of NRS 2-5. Measure supply voltage
across terminals 1 and 3 of NRG 211-1 and measuring voltage across
terminals 2 and 3. If supply voltage = 12 V and no measuring voltage
can be measured, replace preamplifier.
Fault: Defective temperature sensor.
Remedy: Check the measuring voltage across terminals 2 and 3 of NRG 211-1.
If supply voltage = 1 – 4 V check temperature sensor. If temperature
sensor is defective replace level probe.
The temperature measured by means of the resistance thermometer does not
correspond to the actual installation temperature
Fault: Defective Pt 1000.
Remedy: Replace level probe.
Designation Reference no.
Amplifier board NRV 2-30 391 241
Spare parts
Annex
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