6
NRS 2-50, NRS 2-51
Supply voltage
24 VDC +/– 20 %
Fuse
external 0.5 A (semi-delay)
Power consumption
4 VA
Connection of level electrode / level transmitter
(switch-selectable)
1 input for level electrode NRG 21-.. and NRG 26-21, with 3 poles and screen, or
1 analog input 4-20 mA, e. g. for level transmitter NRGT 26-1, with 2 poles and screen
Supply voltage of level electrode
12 VDC
Outputs
NRS 2-50, NRS 2-51: 2 volt-free change-over contacts, 8 A 250 V AC / 30 V DC cos
ϕ
= 1.
De-energizing delay: 3 sec. (MIN / MAX alarm, switchpoint adjustable).
NRS 2-51: 1 volt-free change-over contact, 8 A 250 V AC / 30 V DC cos
ϕ
= 1.
(e. g. feedwater pump ON, switchpoint adjustable).
Provide inductive loads with RC combinations according to manufacturer's specification to ensure
interference suppression.
NRS 2-50, NRS 2-51: 1 analogue output 4-20 mA, max. load 500 ohm, e. g. for actual-value indication.
Indicators and adjustors
1 rotary button with integrated pushbutton “Test” for simulating MIN / MAX alarm and setting the
parameter,
1 seven-segment LED display, four digits, green
2 LEDs red for MIN / MAX alarm,
1 LED amber, e. g. for feedwater pump ON (NRS 2-51),
1 code switch, 4 poles, for configuration
Housing
Housing material: base: polycarbonate, black; front: polycarbonate, grey
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 detached
Fixing of housing:
Mounting clip on supporting rail TH 35, EN 60715
Electrical safety
Pollution degree 2 for installation in control cabinet with protection IP 54, completely insulated
Protection
Housing: IP 40 to EN 60529
Terminal strip: IP 20 to EN 60529
Weight
approx. 0.2 kg
Technical data
