Gestra NRS1-51

level switch NRS 1-51

Technical Data
NRS 1-51 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 Electrical connection of level electrode
1 input for level electrode NRG 1...-51, NRG 1...-12, 4-poles with screen
Sensitivity 0.5 μS/cm or 10 μS/cm (at 25 °C).
Stand-by input 1 volt-free input, 18-36 VDC, for monitoring the purging and bypass time.
Max. bypass time: 5 minutes.
Control circuit 2 volt-free make contacts, 6 A 250 V AC / 30 V DC cos ϕ = 1.
Delay of response: 3 seconds.
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 V DC, 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.
Cross section of connection: 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 1-51 - Installation Instructions - 818955-06