Gestra Valve Control & Alarm Low & High-Level Switch
24VDC
The level controller NRR 2-51 for use in conjunction with level electrodes NRG 2.-.. and level transmitter NRGT 26-1 as a limit switch and water level controller (for example) in steam boilers, (pressurized) hot-water installations as well as condensate and feedwater tanks. The level controller indicates when the preset water level limit MIN or MAX is reached and opens or closes the control valve accordingly.

Designed for use with level electrodes NRG 21-.. and NRG 26-21 as well as the level transmitter NRGT 26-1.

Level controller NRR 2-51: The Level Controller works alongside an electrically actuated control valve as a three-position stepping controller with proportional-plus integral control action (PI controller). In the event of a deviation from the set point, the electrical actuator is under the control of two output contacts and two flashing LEDs indicating whether the control valve opens or closes.

An additional output contact indicates when the MIN or MAX water level is reached (the desired function is switch selectable). After the de-energizing delay has elapsed, the output contact switches over, illuminating the LED for MIN or MAX.

The Level Controller can be configured for fill or discharge control.
When reaching the MIN or MAX water level, the MIN or MAX output contact is switched over in the level controller after a de-energizing delay and illuminating the MIN or MAX LED.

Level controller NRR 2-51: Any faults or malfunctions in the level electrode, the level transmitter, the electrical connection or the settings will be indicated as an error code by the seven-segment LED display. In the event of a malfunction, a MIN and MAX alarm is triggered.

The Rotary Button allows the configuration of parameter settings or simulation of a MIN/MAX Alarm.