Gestra NRS1-50-1E Low Level Switch

Technical Data
NRS 1-50 Supply voltage 24 VDC + / – 20 %, 0.3 A;
100 – 240 VAC +10 / –15 %, 47 – 63 Hz, 0.2 A (optional) External fuse 0.5 A (semi-delay)
Power consumption 7 VA Response sensitivity (Electrical conductivity of water at 25 °C)
> 0,5 ... < 1000 µS/cm or > 10 ... < 10000 µS/cm Connection of level electrode
1 input for level electrode NRG 1...-50, NRG 1...-11, NRG 16-36, 4 poles, with screen.
Stand-by input 1 volt-free input, 24 V DC, for monitoring the purging and bypass time.
Max. bypass time: 5 minutes.
Safety circuit 2 volt-free make contacts, 6 A 250 V AC / 30 V DC cos ϕ = 1.
Delay of response: 3 seconds, 15 sec. for marine applications.
Provide inductive loads with RC combinations according to manufacturer's specification to ensure
interference suppression.
Signal output 1 volt-free output for instantaneous external signalling, 24 VDC, max. 100 mA (semiconductor output).
Indicators and adjustors 2 buttons for test and diagnosis, 2 red/green LEDs for indicating the operating mode and alarm.
3 red LEDs for diagnosis.
Housing Housing material: base: polycarbonate, black; front: polycarbonate, grey.
Conductor size: 1 x 4.0 mm2 solid per wire or 1 x 2.5 mm2 per stranded wire with sleeve to DIN 46228 or
2 x 1.4 mm2 per stranded wire with sleeve to DIN 46228;
terminal strips can be detached Fixing of housing: Mounting clip on supporting rail TH 35, EN 60715
Electrical safety Degree of contamination: 2, overvoltage category III to EN 61010-01.
Protection Housing: IP 40 to EN 60529 Terminal strip: IP 20 to EN 60529 Weight
approx. 0.5 kg
8
NRS 1-50 For ONE Electrode - Installation Instructions - 818987-07