Flowserve NRG 16-38S - Manual (Page 20)

20
1. Fill boiler or vessel with liquid until the lower measuring point is reached.
2. Raise the pressure in the steam boiler or tank until the service pressure is reached.
3. Turn potentiometer to the left until the red LED lights up.
4. Turn potentiometer to the right until only the green LED lights up.
The lower measuring point is now adjusted.
Adjusting lower measuring point NRGT 26-1
Commissioning
Danger
1. Make sure that the level electrodes NRG 16-11 and NRGT 26-1 are properly
connected according to the wiring diagram, Fig. 10, Fig. 11
2. Check whether the mains voltage corresponds to the voltage rating indicated on
the name plate.
The terminal strips and the electronic components of the NRGT 26-1 are
live during operation. This presents the danger of electric shock.
Use only a completely insulated screwdriver according to VDE 0680 for
setting the measuring points.
Check wiring
1. Apply power. The LED of the electrode NRGT 26-1 lights up (exposed
condition), Fig. 6
Apply mains voltage
1. Fill boiler or vessel with liquid until the upper measuring point is reached.
2. Turn potentiometer to the right until only the red LED lights up.
3. Turn potentiometer to the left until the green LED lights up.
4. Turn potentiometer to the right until the green LED goes out.
The upper measuring point is now adjusted.
5. Attach housing cover .
Adjusting upper measuring point NRGT 26-1
When adjusting the measuring points of the electrode in a cold liquid,
the measuring points will shift with rising temperature as a result of the
longitudinal expansion of the electrode rod. Be sure to correct the
settings accordingly.
If a higher accuracy (for 0 % = 4 mA and 100 % = 20 mA) than ± 0.5 is
required, measure the level-proportional current at terminals 1 (–) and
2 (+) in order to establish more accurate settings.
Note
M
L
L
N
M
M
I
O
O
O
K
K