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FM
APPROVED
C
US
2281 Multipoint Switch
Features
• Easy on site probe length configuration
• Fast installation due to 2 to 4 individual switching
points integrated in one sensor
• Up to 4 relays for pump and valve control
• Adjustable sensitivity
• Adjustable delay time
The Multipoint Switch is based on the conductivity
principle and can be applied to liquids with conductivity
higher than 10 μS/cm.
The probes have to be placed into the tank for level
detection. The probe length should be in accordance
with the level to be detected. Filling liquid in the tank will
change the electrical conductivity between the reference
probe and the outer probes. The established connection
will be converted and activate a relay providing the
output.
Applications
• Potable Water
• Cooling Water
• Chemicals
• Pump Control
www.gfps.com/level
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Dimensions
89 mm (3.5 in)
121 mm (4.76 in)
64 mm (2.52 in.)
35 mm (1.38 in.)
16 mm (0.63 in.)
17,6
mm
(0.69 in.)
14
mm
(0.55 in.)
65 mm (2.56 in.)
52 mm (2.05 in.)
M20x1,5
1½” BSP
M6
121 mm (4.76 in)80 mm
(1.3 in)
33 mm
(3.15 in)
Multiprobe sockets:
2281-S-BT-2; 2 electrodes
2281-S-BT-3; 3 electrodes
35 mm
90 mm (3.54 in.)
67,5 mm (2.66 in.)
45 mm (1.77 in.)
3,4
mm (0.13 in.)
(1.38 in.)
Conductive Level Control
Switch Type 2281-1-Relay;
1 SPDT Relay
90 mm (3.54 in.)
67,5 mm (2.66 in.)
45 mm (1.77 in.)
19 mm
21 mm
(0.83 in.)
(0.75 in.)
56,5 mm (2.22 in.)
Conductive Level Control
Switch Type 2281-2-Relay;
2 SPDT Relay
2281-S-BT-4; 4 electrodes
Specifications
General
Type 2281-Y-YY-Y 2281-1-Relay 2281-2-Relay
Probes 2, 3, 4
Environmental
Process Temperature max. +80 °C (176 °F)
Ambient Temperature -20 °C…+50 °C (-4 °F…+122 °F)
Process Pressure (absolute) 0.1 MPa (1 bar) 14.5 psi
Enclosure
Enclosure Material PBT
Process connection material PP
Probe socket material Stainless Steel 1.4571
Ingress protection IP65, NEMA 4 IP20, NEMA 1
Process Connection 1½ in.
Probes
Material Stainless Steel 1.4571
Standards Lengths Available 0.5 m (19.69 in.), 1.0 m
(39.37 in.), 1.5 m (59.06 in.)
(72 in., 108 in. on request)
Please contact GF for special lengths up to 3 m
Probe separator
Material PP
Electrical
Probe Voltage 3.5 V AC 5 V AC
Probe Current < 0.2 mA AC < 1mA AC
Response max. 400 ms
Delay Adjustable: 0.5…10 s
Relay Output 1x SPDT 2x SPDT
Switching Voltage 250 V AC1, 24 V DC
Switching Current 8 A AC1 16 A AC1
Switching Power 2500 VA AC1, 240 W DC 4000 VA AC1, 384 W DC
Power Supply 24 V…240 V AC / DC 24 V AC / DC
Mechanical Connection DIN EN 60715 rail
Electrical Connection Class II Class III
Standards and Approvals
General Approvals CE, RoHS
www.gfsignet.com
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Accessories
Ø6
Probe dimension Probe separator 2281-5 spacer,
Wiring
M6
L=0.5 m (19.68 in.)... 3m (118.11 in.)
30 mm (1.18 in.)
30 mm (1.18 in.)
to be used every 0.5 m (19.69 in.)
1 SPDT Relay: Type 2281-1-Relay
Part No.: 159 300 258
A1, A2 - power supply
C - reference probe
E1 - upper level probe
E2 - bottom level probe
S - shielding
15, 16, 18 - 1. relay output
25, 26, 28 - 2. relay output
Single Level Monitoring
2 SPDT Relay: Type 2281-2-Relay
Part No.: 159 300 259
C
E2
E1 E2
C
E1
Device Settings
level control
level control
To detect two independent levels in one or two seperate tanks
One Tank
Level Control
E1 E2
Output relay for pump control.
Selection of contacts depends on required function.
Level Control - Two levels in one tank
C
E1
E2
Device Settings
www.gfsignet.com
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Ordering Information
2281
Example
with 4 probes
Max, Max Alarm
Probe
Max Alarm
Probe
Reference
Electrode
Probe
Insulators
Min Alarm
Probe
Min, Min Alarm
Probe
How to Order
The 2281 can be utilized for alarming 2-4 level set-points, any
combination of LO or HI levels. The 2281 housing must always
remain out of the fluid being measured.
Step 1 - Select Multiprobe Enclosure based upon the quantity of
desired alarms 2, 3, or 4.
Step 2 - Select one stainless steel rod to serve as the reference
electrodes. Choose either a 19.69 in., 39.37 in., or 59.06 in., the
length should be longer than any of the alarm probes. Note: The
rod can be cut shorter onsite with a hack saw for a precise fit.
Step 3 - Select one stainless steel rod for each alarm set-point (up
to four rods). For each length choose either a 19.69 in., 39.37 in., or
59.06 in. Note: The rod can be cut shorter onsite with a hack saw
for a precise dimension.
Step 4 - Select probe insulator, a minimum of one is required. It's
suggested to add one more for every additional 20 in. of assembly
length (maximum 3).
Step 5 - Select the amount of alarm relays to match the amount of
alarm set-points. Choose either 2 or 1 and 2=3, or 2 and 2=4.
Step 1
Step
2 &3
Step 4
Step 5
Options
Mfr. Part No. Code Description
2281-S-BT-2 159 300 250 Multiprobe enclosure, 2 probes + reference probe, PBT enclosure,
1 1/2" BSP thread
2281-S-BT-3 159 300 251 Multiprobe enclosure, 3 probes + reference probe, PBT enclosure,
1 1/2" BSP thread
2281-S-BT-4 159 300 252 Multiprobe enclosure, 4 probes + reference probe, PBT enclosure,
1 1/2" BSP thread
2281-E-205 159 300 253 Stainless steel electrode, 0.5 m (19.69 in.)
2281-E-210 159 300 254 Stainless steel electrode, 1.0 m (39.37 in.)
2281-E-215 159 300 255 Stainless steel electrode, 1.5 m (59.06 in.)
2281-5-Spacer 159 300 257 Probe separator for conductive level switch
2281-1-Relay 159 300 258 Conductive level control switch, 1 SPDT relay, 24 - 240 V AC/DC
2281-2-Relay 159 300 259 Conductive level control switch, 2 SPDT relay, 24V AC/DC
Enclosure NEMA 4A, fiberglass with SS hardware,
7.69 in. L x 7.69 in. W x 6.38 in. D
6205-0002 159 000 858 1 meter length DIN Rail
6205-0003 159 000 859 End clip for DIN Rail
195.27 mm
(7.69 in.)
4X 8.86 mm
(0.34 in)
Rev C (11/15)
195.27 mm
(7.69 in.)
162.05 mm
(6.38 in.)
127.36 mm
(5.01 in.)
185.93 mm
(7.32 in.)
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