Gestra NRS 1-50 Two-electrode device Level Switch

Water Level Limiter Level Switch
NRS 1-50
Dimensions
100
74
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Technical Data Supply voltage 24 VDC +/– 20 %, 0.3 A 100 – 240 VAC + 10/– 15 %, 47 – 63 Hz, 0.2 A (optional)
External fuse M 0.5 A (semi-delay) Power consumption 7 VA Sensitvity of response
(Electrical conductivity of water at 25 °C) > 0.5 ... < 1000 μS/cm or > 10 ... < 10000 μS/cm
Electrical connection of level electrode To connect the level electrodes please use:
n For level switch NRS 1-50 with response sensitivity 10 μS:
Screened multi-core control cable, min. conductor size 0.5 mm2, e.g. LiYCY 4 x 0.5 mm2, max. length 100 m.
n For level switch NRS 1-50 with response sensitivity 0.5 μS:
Double-screened multi-core low-capacitance data cable, min.
conductor size 0.5 mm2, Li2YCY PiMF 2 x 2 x 0.5 mm2, max. length 30 m.
Stand-by input 2 volt-free inputs, 24 V DC, for monitoring the purging and
bypass time. Max. bypass time: 5 minutes.
Wiring: control cable 2 x 0.5 mm2.
Safety circuit 2 volt-free make contacts, 6 A 250 V AC / 30 V DC cos ϕ = 1.
Delay of response: 3 seconds, 15 sec. for marine ­applications.
Provide inductive loads with RC combinations according to manufacturer‘s specification to ensure interference
suppression.
Signal output 2 volt-free outputs for instantaneous external signalling,
24 V DC, max. 100 mA (semiconductor output).
Wiring: control cable 2 x 0.5 mm2.
Indicators and adjustors 2 buttons for test and diagnosis, 4 red/green LEDs for
indicating the operating mode and alarm.
3 red LEDs for fault diagnosis, 2 two-pole code switches for setting the number of electrodes.
Housing Housing material: base: polycarbonte, black; front: poly­ carbonate, grey. Terminal strips separately detachable
Fixing of housing: Mounting clip on supporting rail
TH 35, EN 60715.
Order & Enquiry Specification
GESTRA Level switch NRS 1-50 as water level limiter acc. to TRD, EN 12952/EN 12953
For TWO electrodes Certified to IEC 61508 (SIL3) Supply voltage ..................
Sensitivity ..................... μS/cm
Directives and Standards For more information on the conformity of the equipment as
well as applied Directives and Standards please refer to our Declaration of Conformity and associated certificates and/
or approvals.
Supply in accordance with our general terms of business.
GESTRA AG Münchener Straße 77, 28215 Bremen, Germany Telefon +49 421 3503-0, Telefax +49 421 3503-393
E-mail [email protected], Web www.gestra.com 818912-09/10-2024cm (808818-11) · GESTRA AG · Bremen
Test
Test
0
12 1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
Wiring diagram
8
9
N
LL N (+) (-) (-) (+)
0
-– + +
a
0
9
-– + +
M 0,5A 0.5A M
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Test
1
Test
2
3
4
5
*
NRG 1..-50
NRG 1..-11
6
7
+ –
b
+ -
8
9 10 11 12 13 14 15
*
+ –
b
+ -
CEP 3 2
3 2
1
1
c
CEP
NRG 1..-50
NRG 1..-11
c 3 4 1
2
Key 8 Supply voltage 9 Signal output 1 / 2 for external alarm 24 V DC, 100 mA (semiconductor
output) 0 Safety circuit, input and output, external fuse: 2 A (anti-surge) or 1 A (anti-surge),
72 hours a Wire link, on site, when used as water level limiter acc. to
EN 12952 / EN 12953 b Stand-by input 1 / 2, 24 V DC, for connecting the logic unit
SRL 6-50 c Level electrode NRG 1...-50,
NRG 1...-11, NRG 16-36
CEP Central earthing point in control cabinet
* NRS 1-50 with response sensitivity 0.5 μS: Connect the two internal screens
to terminal 5/13 and to the CEP.
c
NRG 16-36
Electrical safety Degree of contamination: 2, overvoltage category III to
EN 61010-01.
Protection Housing: IP 40 to EN 60529, Terminal strip: IP 20 to
EN 60529 Weight approx. 0.5 kg 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 Site altitude max. 2000 m
Interlock In the event of an alarm the level switch NRS 1-50 does not interlock automatically. If an interlocking function in the
installation is required, the follow-up circuit (safety circuit) must be equipped with an interlock. The circuitry must meet
the requirements of the EN 50156.
Power supply and stand-by input Use a safety power supply unit (SELV) to feed the level switch
NRS 1-50 with 24 V DC. Only devices with protection by electrical separation or with low voltage may be connected
to the stand-by inputs.
Order & Enquiry Specification
GESTRA Level switch NRS 1-50 as water level limiter acc. to TRD, EN 12952/EN 12953
Supply voltage ..................
Sensitivity ..................... μS/cm