Flowserve NRG211-1 Level Probe Manual de usuario descargar pdf (Pagina 19)

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 – continued –

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Flowserve NRG211-1 Level Probe Manual de usuario Pagina 19