Flowserve NRG211-1 Level Probe - Manual (Page 15)

15
1. Switch on the mains supply and check whether the mains voltage is applied
across the level switch. See installation instructions NRS 2-4 or NRS 2-5.
Commissioning
1. Check whether the 19" slide-in unit has been properly installed in the magazine.
2. Check whether the mains supply corresponds to the wiring carried out on the level
probe.
Check wiring
Apply mains voltage
Note
The level probe NRG 211-1 can only be operated and checked in com-
bination with the level switch NRS 2-4 (high level) or NRS 2-5 (low level).
1. With level switch NRS 2-4
Check the switching function “high level”. To assist with this objective raise the water
level in the tank above the preset high level. The LED high level located at the level
switch NRS 2-4 must light up and the corresponding function in the secondary
circuit must be operated.
With level switch NRS 2-5
Check the switching function “low level”. To assist with this objective lower the water
level in the tank below the preset low level. The LED low level located at the level
switch NRS 2-5 must light up and the corresponding function in the secondary
circuit must be operated.
2. Raise (NRS 2-5) or lower (NRS 2-4) the water level in the tank. The level electrode
NRG 211-1 must switch back to normal operation.
Check switching function
1. Check the supply and measuring voltage of the level electrode. The voltages can
be measured at the electrode or level switch. Fig. 4
Supply voltage: 12 V DC
Measuring voltage: see table 1 – measuring voltages on page 16
In order to check the measuring voltage for probe exposed refer to “Check
Resistance Thermometer”
Check voltage