Gestra Two Channel SMART Level Switch Hi Integ & Low Level 100-230v
The level switch NRS 1-50 in conjunction with level electrode 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 level electrode.
When the water falls below the set level, the electrode is exposed and triggers a low-level alarm in the level switch. The length of the electrode tip determines the switchpoint.

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 safety circuit and can only be deactivated when the level electrode enters the water again.
In addition, the signalling contact for external signalling devices closes instantaneously.

An alarm raises if a malfunction occurs in the level electrode and/or the electrical connection.

If the level electrode is installed in a level pot outside the boiler, ensure the connecting lines are cleaned and rinsed regularly. During the rinsing process, you cannot measure the water level 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 are ≥40mm and water ≥ 100mm the installation is considered to be internal. In this case, the rinsing processes do not require monitoring.

An automatic self-testing routine monitors the safety functions in the level switch and the level electrode. In the event of a malfunction, the safety circuit opens instantaneously and switches the heating off.

LED's on the unit will indicate any alarms or error messages. The Level Switch's Test button simulates an alarm.