12
NRS 1-51 - USA - Installation & Operating Manual -
850695-00
Supply voltage
24 VDC +/– 20%, 0.3 A; SELV / PELV / CLASS2
100 – 240 VAC +10 / –15%, 47 – 63 Hz, 0.2 A (optional)
Fuse
External 0.5A; UL category JDYX, e.g., RND 170-00012
Power consumption
7 W
Response sensitivity
[Water conductivity at 77 °F (25 °C)]
> 5 ... < 5000 ppm (> 10 ... < 10000 µS/cm)
Level electrode connection
1 input for NRG 1...-51 level electrode, 4-pole with shield,
sensitivity 5 ppm (10 µS/cm) [at 77 °F (25 °C)]
Control circuit
2 volt-free NO contacts, 6 A 250 V AC / 30 V DC cos
ϕ
= 1.
Off delay 3 seconds.
Inductive loads must have interference suppression (RC combination) as specified by the manufacturer.
Signal output
2 volt-free outputs for external signaling without delay, 24 V DC, max. 100 mA (semiconductor output).
Indicators and controls
2 buttons for testing and
diagnosis, 2 red/green LEDs for indicating operating state and alarm.
3 red LEDs for diagnosis.
Terminal box
Terminal box material: base of black polycarbonate, front of gray polycarbonate
Wire size: 1 x AWG12 (4.0 mm
2
) solid, or
1 x AWG14 (2.5 mm
2
) stranded with sleeve acc. to DIN 46228, or
2 x AWG16 (1.4 mm
2
) stranded with sleeve acc. to DIN 46228
Terminal strips can be removed separately
Terminal box attachment: Mounting clip on support rail TH 35, EN 60715
Electrical safety
Pollution degree 2, overvoltage category II according to UL 60730-1
Protection
Terminal box: IP 40 according to EN 60529
Terminal strip: IP 20 according to EN 60529
As a UL open type, the equipment must be installed in a control cabinet.
Weight
Approx. 1.1 lb (0.5 kg)
Ambient temperature
at power-on 32 ° ... 131 °F (0 ° … 55 °C)
in operation 14 ° … 131 °F (-10 ° … 55 °C)
Transport temperature
-4 ° … 176 °F (-20 ° … +80 °C) (<100 hours), defrosting time of de-energized equipment
before it can be put into operation: 24 hours.
Storage temperature
-4 ° … 158 °F (-20° … +70 °C), defrosting time of de-energized equipment
before it can be put into operation: 24 hours.
Relative humidity
Max. 95%, non-condensing
Site altitude
Max. 6560 ft (2000 m)
Other information
Incorporated Type 2 action protective control Class B (C)
Pollution degree 2, impulse voltage 2500 V
Technical data
