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Combustion & Control Systems,Mumbai,India.

The level switch NRS 1-50 is used in conjunction with level electrodes NRG 1...-.. to limit the water level in steam boilers and (pressurised) hot-water plants. Water level limiters switch off the heating when the water level falls below the set minimum level (low water).

The level switch NRS 1-50 is designed for different electrical conductivities of the boiler water and for connecting one or two level electrodes.

When the water level falls below the low level the level electrodes are exposed and a low level alarm is triggered in the level switch. This switchpoint is determined by the length of the electrode rod (level electrode NRG 1...-50, NRG 1...-11, NRG 16-36). After the de-energizing delay has elapsed, the two output contacts of the level switch will open the safety circuit for the heating. The switching-off of the heating is interlocked in the external safety circuit and can only be deactivated when the level electrode enters the water again. In addition, two signal outputs for external signalling devices close instantaneously. An alarm will also be raised if a malfunction occurs in the level electrode and/or the electrical connection.

If the level electrode is installed in an isolatable level pot outside the boiler, make sure that the connecting lines are rinsed regularly. During the rinsing process the water level cannot be measured in the level pot for 5 minutes. The level switch therefore bypasses the level electrode and monitors the rinsing and bypass time (standby input, controlled by the logic unit SRL 6-50).

If the connecting lines for steam ≥ 40 mm and water ≥ 100 mm, the installation is considered to be internal. In this case the rinsing processes do not have to be monitored.

An automatic self-testing routine monitors the safety functions in the level switch and the level electrodes.

In the event of a malfunction the safety circuit opens instantaneously and switches the heating off.

Alarm and errror messages are indicated by LEDs and a signal output for each level electrode is energised without delay.

An alarm can be simulated by pressing the test button.