Boiler level controller NRR 2-50, NRR 2-51

Continuous water level controller with variable switchpoints Capacitance proportional controllers NRR 2-50 and NRR 2-51 These closed-loop controllers use both capacitance probes and level transmitters from the SPECTORcompact line, and feature a three-position proportional stepping output for electric valves, or a modulating control output for pneumatic valves. The icon-based menus are navigated using a rotary knob/pushbutton. The values are shown on a 4-digit, 7-segment display. 100% measuring range adjustment is possible from a water level of 25% or more.