Product Description

GESTRA NRS 2-1

The GESTRA NRS 2-1 is a high-integrity level switch designed for steam boiler plants and (pressurised) hot water installations. Operating on the conductivity principle in conjunction with GESTRA level electrodes, it functions as a water level limiter, providing high or low-level alarms. This compact unit is built for safety-critical applications, offering reliable level detection and switching. It is TÜV type-approved and suitable for installations requiring up to SIL 3 safety integrity levels.

Technical Specifications:

Type: High-Integrity Level Switch (Conductivity Principle)
Application: Water level limiter (High or Low Level) for steam boilers and pressurised hot water
Supply Voltage: 230 V AC, 50/60 Hz (Standard – other options may exist)
Power Consumption: Approx. 3 VA
Output: 1 volt-free change-over contact
Switching Voltage / Current (Output): Max. 250 V AC / Max. 4 A AC; Max. 300 V DC / Max. 0.2 A DC
Ambient Temperature: -20 °C to +70 °C
Enclosure Protection: IP 40 (Terminal strip IP 20) when installed in a control cabinet or housing with IP40 or higher
Approvals: TÜV Type-Approved, SIL 3 capable (acc. to IEC 61508)
Mounting: DIN rail mounting TS 35
Compatibility: Used with GESTRA level electrodes (e.g., NRG 1x-x, NRG 2x-x series)