Gestra NRS2-50

level switch NRS 2-50

Technical data
NRS 2-50, NRS 2-51 Supply voltage 24 VDC +/– 20% Fuse external 0.5A (semi-delay)
Power consumption 4W Connecting a level electrode/level transmitter (switch-selectable)
1 input for NRG 21-.. and NRG 26-21 level electrode, 3pole with shield, or
1 analogue input 4-20 mA, e.g. for the NRGT 26-. level transmitter, 2-pole with shield.
Supply voltage to level electrode 12 VDC Outputs:
NRS 2-50, NRS 2-51: 2 volt-free relay contacts, 8 A 250 V AC / 30 V DC cos ϕ = 1.
Off delay 3 seconds (MIN/MAX alarm, adjustable switchpoint).
NRS 2-51: 1 volt-free relay contact, 8 A 250 V AC / 30 V DC cos ϕ = 1.
(e.g. feedwater pump on, adjustable switchpoints).
Inductive loads must have interference suppression (RC combination) as per the manufacturer's
specifications.
NRS 2-50, NRS 2-51: 1 analogue output 4-20 mA, max. output load 500 ohms, e.g. for actual value
indication.
Displays and controls 1 rotary knob with integrated pushbutton for testing the MIN/MAX alarm and setting the parameters,
1 four-digit seven-segment LED display, green 2 red LEDs for MIN/MAX alarm,
1 amber LED e.g. for feedwater pump on (NRS 2-51), 1 four-pole code switch for configuration.
Housing Housing material: base of black polycarbonate; front of grey polycarbonate
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 1.5 mm2 per stranded wire with sleeve to DIN 46228 (min. ∅ 0.1 mm) Terminal strips can be removed separately
Housing attachment: Mounting clip on support rail TH 35, EN 60715 Electrical safety
Pollution degree 2 for installation in control cabinet with protection rating IP 54, fully insulated
IP rating Housing: IP 40 to EN 60529 Terminal strip: IP 20 to EN 60529 With panel adapter: IP 65 to EN 60529
Weight approx. 0.2 kg
6
NRS 2-50, NRS 2-51 - Installation & Operating Manual - 819179-07