6
NRS 2-50, NRS 2-51 - Installation & Operating Manual -
819179-05
NRS 2-50, NRS 2-51
Supply voltage
24 VDC +/– 20%
Fuse
external 0.5A (semi-delay)
Power consumption
4 W
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 mm
2
solid per wire, or
1 x 2.5 mm
2
per stranded wire with sleeve to DIN 46228, or
2 x 1.5 mm
2
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
Technical data
