Bộ công tắc báo mức nước Gestra NRS 1-50 For ONE Electrode
Technical Data
Supply voltage
24 VDC + / – 20 %, 0.3 A; 100 – 240 VAC +10 / –15 %, 47 – 63 Hz, 0.2 A (optional)
External fuse
M 0.5 A (semi-delay)
Power consumption
7VA
Sensitivity of response
(Electrical conductivity of water at 25 °C)
> 0.5 … < 1000 μS/cm or
> ,10 … < 10000 μS/cm
Electrical connection of level electrode
To connect the level electrode please use:
n For level switch NRS 1-50 with response sensitivity 10 μS:
Screened multi-core control cable, min. conductor size
0.5 mm2, e.g. LiYCY 4 x 0.5 mm2, max. length 100 m.
n For level switch NRS 1-50 with response sensitivity 0.5 μS:Double-screened multi-core low-capacitance data cable, min. conductor size 0.5 mm2, Li2YCY PiMF 2 x 2 x 0.5 mm2, max. length 30 m.
Stand-by input
2 volt-free inputs, 24 V DC, for monitoring the purging and bypass time. Max. bypass time: 5 minutes.
Wiring: control cable 2 x 0.5 mm2.
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 speci cation to ensure interference suppression.
Signal output
1 volt-free output for instantaneous external signalling,
24 V DC, max. 100 mA (semiconductor output).
Wiring: control cable 2 x 0.5 mm2.
Indicators and adjustors
2 buttons for test and diagnosis, 2 red/green LEDs for indicating the operating mode and alarm.
3 red LEDs for fault diagnosis.
2 code switches with 2 poles for setting the number of electrodes.
Housing
Housing material: base: polycarbonate, black; front: poly- carbonate, grey. Terminal strips separately detachable Fixing of housing: Mounting clip on supporting rail TH 35, EN 60715.
