Specifications are subject to change without notice (25.06.99) 1
Level Sensors
• Level control for conductive liquids
• Max.-min. control of CHARGING
• SV 120/220: Fixed sensitivity
• SV 125/225: Adjustable sensitivity
• 10 A SPDT or 8 A DPDT output relay
• LED-indications: Power supply and relay on
• AC or DC power supply
Product Description Ordering Key SV 120 230
Level control relay for con-
ductive liquids which can
control two levels of charg-
ing. Usable for one level
detection with pin 5 and 7
short-circuited.
Housing
Output
Power supply
Type Selection
Plug Output Supply: 24 VAC Supply: 115 VAC Supply: 230 VAC Supply: 24 VDC
Circular SPDT SV 120 024 SV 120 115 SV 120 230 SV 120 724
DP DT SV 220 024 SV 220 115 SV 220 230 SV 220 724
SPDT SV 125 024 SV 125 115 SV 125 230 SV 125 724
DPDT SV 225 024 SV 225 115 SV 225 230 SV 225 724
Amplifier, Conductive
Types SV 120/220, SV 125/225 (Charging)
Input Specifications
Level probe supply Max. 24 VAC
Level probe current Max. 2.5 mA
Sensitivity
SV120/SV220 ON From 25 to 50 kΩ
OFF From 15 to 37 kΩ
SV125/SV225 ON From 3-11 to 35-55 kΩ(adj.)
OFF From 1-5 to 20-30 kΩ(adj.)
Supply Specifications
General Specifications
Power supply AC types Overvoltage cat. II (IEC 60664)
Rated operational voltage
through pins 2 and 10 230 230 VAC ± 15%
50/60 Hz, -5/+5 Hz
115 115 VAC ± 15%
50/60 Hz, -5/+5 Hz
024 24 VAC ± 15%
50/60 Hz, -5/+5 Hz
Rated insulation voltage 250 VAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs) (line/neutral)
Power supply DC types Overvoltage cat. II (IEC 60664)
Rated operational voltage
724 24 VDC ± 15% (pin 2 pos.)
Rated insulation voltage None
Rated impulse withstand volt. 800 V (1.2/50 µs)
Indication for
Power supply ON LED, green
Output ON LED, red (724 only red)
Environment
Degree of protection IP 20 B
Pollution degree 3 (IEC 60664)
Operating temperature -20 to +50ºC (-4 to +122ºF)
Storage temperature -50 to +85ºC (-58 to +185ºF)
Approvals UL, CSA
CE-marking Yes
SV 120/220 SV 125/225
2Specifications are subject to change without notice (25.06.99)
Mode of Operation
Max. and min. control of
charging.
Example 1
The diagram shows the level
control connected as max.
and min. control, i.e. detec-
tion of 2 levels. The relay
releases until the max. elec-
trode is in contact with the li-
quid. The relay operates
when the min. electrode is no
longer in contact with the li-
quid. By use of a container of
a conductive material (pin 7)
can be connected to the con-
tainer. If the container is made
of a non-conductive material,
an additional electrode is
needed, indicated by the dot-
ted line in the diagram.
Example 2
If only one level is required,
pins 5 and 7 must be inter-
connected to select either
max. or min. control.
Wiring Diagrams
SV 1xx/SV 2xx, two levels
Example 1
SV 120/220, SV 125/225
SV 1xx/SV 2xx, one level
Example 2
Power Supply
Min.
Max.
Max. or Min.
Power Supply
Output Specifications
SV120/SV125 SV220/SV225
Output SPDT relay DPDT relay
Rated insulation voltage 250 VAC (rms) 250 VAC (rms)
(cont./elec.) (cont./elec., cont./cont.)
Contact ratings (Ag-CdO) µ (micro gap) µ (micro gap)
Resistive loads AC 1 10 A/250 VAC (2500 VAC) 8 A/250 VAC (200 VA)
DC 1 1 A/250 VAC (250 W) 0,4 A/250 VDC (100 W)
or 10 A/25 VDC (250 W) 4 A/25 VDC (100 W)
Small inductive loads AC 15 2.5 A/230 VAC 2.5 A/230 VAC
DC 13 5 A/24 VDC 5 A/24 VDC
Mechanical life ≥5 x 107operations ≥5 x 107operations
Electrical life ≥105operations ≥105operations
Operation frequency ≤7200 operations/h ≤7200 operations/h
Insulation voltages
Rated insulation voltage AC ≥2.0 kVAC (rms) ≥2.0 kVAC (rms)
(cont./elect.) (cont./elect.)
DC None None
Rated impulse withstand voltage AC 4 kV (1.2/50 µs) 4 kV (1.2/50 µs)
(cont./elect.) (IEC 60664) (cont./elect.) (IEC 60664)
DC 800 V 800 V
Operation Diagram
Power supply
Max. electrode in liquid
Min. electrode in liquid
Relay on
Accessories
Conductive level probe: 1 or 2 electrodes
VH..., VPC..., VPP...
VN..., VNY..., VNI...
VT..., VTI..., VS...
