Flowserve NRS1-9 - Manual (Page 12)

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1. Check length of electrode tip (see installation instructions for NRG 16-36).
2. Completely open valves of water-level gauge glass on steam boiler.
3. Fill boiler with feedwater until the level exceeds the required max. level.
After the response delay of 2 sec. the red LED must light up, fig. 2.
4. Decrease level in the boiler until the level falls below high level, the red LED
must extinguish.
High-level limiter
Water level controller
1. Check length of electrode tips (see installation instructions for NRG 16-36).
2. Lower water level in boiler until electrode tip “2” (lower switch point) is completely
exposed, fig. 1.
3. The green led must light up, fig. 2.
Simultaneously the switching function for feedwater control (PUMP ON)
is released.
4. When the water level reaches electrode tip “3” (upper switch point), LED must
extinguish. Simultaneously the switching function for feedwater control (PUMP
OFF) is released.
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Performance Tests
Low-level limiter
1. Check length of electrode tip (see installation instructions for NRG 16-36).
2. When switching on the mains voltage the green LED should light permanently,
fig. 2.
3. Completely open valves of water-level gauge glass on steam boiler.
4. Fill boiler with feedwater (2 cm above required min. level).
5. Decrease level in boiler until the level falls below min. level. After the response
delay the two red LEDs must light up.
6. A low-level alarm can be simulated by pushing the button “TEST I” whilst the
electrode tip is submerged. Push the button until the response delay has expired.
Both red LEDs must light up.
7. To check the function of the checking circuitry of the switching controller proceed
as follows: Operate switch “TEST II/INSPECTION” in the direction of the arrow
with the electrode tip submerged. After max. two minutes the two red LEDs
should signal low-level alarm.
The button “TEST I” must not be operated during this test nor must the level
fall below the low level mark.
After the test return switch into its original position. After the response delay the
two red LEDs must extinguish.
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