Bộ công tắc báo mức nước Gestra NRS 2-50, NRS 2-51
Technical data
Supply voltage
24 VDC, + / –20 %
Fuse
external 0.5 A (semi-delay)
Power consumption
4W
Connection for level electrode, level transmitter
(switch-selectable)
1 input for level electrode NRG 21-.. and NRG 26-21, with
3 poles and screen or
1 analogue input 4-20 mA, e. g. for level transmitter NRGT 26-., with 2 poles and screen.
Supply voltage for 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 speci cation 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 adjusters
1 rotary button with integrated pushbutton “Test” for simu- lating MIN / MAX alarm and setting the parameter,
1 seven-segment LED display, four digits, green
2 red LEDs for MIN / MAX alarm,
1 amber LED, e. g. for “Feedwater pump ON” (NRS 2-51), 1 code switch, 4 poles, for con guration
Housing
Housing material: base: polycarbonate, black;
Front: polycarbonate, grey.
Terminal strips separately detachable.
Fixing of housing: Mounting clip on supporting rail TH 35, EN 60715
Electrical safety
Contamination class 2.
Protection
Housing: IP 40 to EN 60529
Terminal strip: IP 20 to EN 60529
with panel adaptor: IP 65 to EN 60529
Weight
Approx. 0.2 kg
Further conditions:
Ambient temperature
when system is switched on: 0 … 55 °C, during operation: –10 … 55 °C
Transport temperature
–20 … +80 °C (< 100 hours), defrosting time of the de-energized equipment before it can be put into operation: 24 hours.
Storage temperature
–20 … +70 °C, defrosting time of the de-energized equipment before it can be put into operation: 24 hours.
Relative humidity
max. 95%, no moisture condensation
