Product Description

GESTRA NRS 2-50 Level Switch

The GESTRA NRS 2-50 is a level switch designed for detecting minimum or maximum liquid levels in steam boilers, pressurized hot water installations, feedwater tanks, and condensate tanks. It operates based on the conductive measurement principle in conjunction with GESTRA level electrodes (like NRG 1…-50 / NRG 1…-51). The NRS 2-50 provides reliable level signalling (e.g., High or Low level alarm) and features self-checking capabilities to ensure safe plant operation. It is suitable for applications requiring compliance with EN 12952 and EN 12953 standards.

Technical Specifications:

Supply Voltage Options: 230 V AC, 115 V AC, 24 V AC (50/60 Hz) or 24 V DC
Power Consumption: Approx. 3 VA (AC) or 2 W (DC)
Output Contact: 1 potential-free change-over contact
Switching Capacity (Max): 250 V AC, 4 A, 1000 VA (cos φ ≥ 0.7); 300 V DC, 0.2 A, 60 W; 24 V DC, 1 A, 24 W
Sensitivity (Response Value): Adjustable, approx. 0.5 μS/cm to 1000 μS/cm
Time Delay: Approx. 1 second (standard), other options available
Function Test: Integrated TEST button
Indicators: LEDs for operational status and level alarm
Ambient Temperature: -20 °C to +60 °C
Housing Material: Base: Polyamide (PA), Front cover: Polycarbonate (PC)
Protection Class: Housing IP40, Terminals IP00
Mounting: DIN rail TS 35 acc. to EN 60715
Approvals: TÜV type-approved acc. to EN 12952 / EN 12953, SIL 2 (when used as part of a High Level or Low Level limiting system)