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ZIEHL industrie-elektronik, 74523 Schwäbisch Hall, Germany, +49 791 504-0, info@ziehl.de, www.ziehl.de
Lever-Relays NS20 for conducti-
ve liquids can be used as monitors
for 1 Level and for controlling a
level between 2 electrodes.
3 elektrodes for MIN/MAX-
control
2 elektrodes (E2 open) as
level-monitor
Sensitivity adjustable
5 kΩ...250 kΩ
LED for state of relay
Function of relay reversible
(picks up or releases at top
electrode)
Switching-delay adjustable
0,1 ... 10 s
Universal supply-voltage AC/
DC 24-240 V
Applications as level-monitor:
Protection from running dry or
overflow, seal-monitoring of
submersible pumps for leaks,
detection of leaks.
Applications Min/Max:
Controlling a level between mi-
nimum (elektrode E2) and maxi-
mum (E3). As long as E3 is dry,
a magnetic valve is opened (or a
pump is running) and liquid is inu-
enting. As soon as maximum (E3)
is reached, the NS 20 closes the
valve. When the level falls below
E2, the cycle starts new.
In reverse also discharging of a
container can be controlled.
Level Monitor Type NS20
1 Level and MIN / MAX-Control
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Technical Data
Supply voltage Us
Relay
Contact
Switching delay
Test conditions
Rated ambient temperature
range
Number of electrodes
Voltage at electrodes
Line capacity at 5 kΩ
at 150 kΩ
at 250 kΩ
Dimensions (h x w x d) mm
Attachment
Protection housing/terminals
Weight
AC/DC 24-240 V, 0/50/60 Hz, <2W, <3VA
(DC 20,4-297 V, AC 20-264 V)
1 change-over-contact (co)
type 2 see "general technical information"
adjustable 0,1...10 s
see "general technical information"
-20°C...+55°C
2 or 3 (with 2 electrodes: E2 not connected)
< AC 6 Ve
max. 500 nF = app. 2500 m
max. 20 nF = app. 100 m
max. 10 nF = app. 50 m
design V2: 90 x 35 x 58 mm, mounting height 55 mm
on 35 mm DIN-rail or with screws M4
IP 30/ IP 20
app. 100 g
1
2
4
E1 E2 E316 15 18
3
NC 12
Überwachung Flüssigkeitsstand mit 1 Elektrode (E3 benetzt, Relais an
15-18 geschlossen)
monitoring of liquid with 1 electrode (E3 dipped, relay on 15-18 closed)
1 Elektrode / electrode
2 Flüssigkeitsbehälter / tank
3 Magnetventil / magnetic valve
4 Bezugselektrode / basic electrode
Zulaufsteuerung mit 2 Elektroden (E3 benetzt, Relais aus 15-16 geschlossen)
lling tank with 2 electrodes (E3 dipped, relay o 15-16 closed)
1 Elektrode / electrode
2 Flüssigkeitsbehälter / tank
3 Magnetventil / magnetic valve
4 Bezugselektrode / basic electrode
NS20
Part number: V223440
Level Monitors