Page 1
`relay 1 energised´ indicator
`relay 2 energised´ indicator
GF Piping Systems
Instruction manual
2281 Conductive multipoint switch
with dual channel relay
5. Dimensions
Switching unit: 2281-2-Relay
65
45
90
67,5
52
Georg Fischer Piping Systems Ltd CH-8201 Schaffhausen
Phone +41(0)52 631 30 26 / info.ps@georgfischer.com /
www.gfps.com
GFDO 6354_4 (07.14)
© Georg Fischer Rohrleitungssysteme AG
CH-8201 Schaffhausen/Schweiz, 2014
Printed in Switzerland
Follow instruction manual
The instruction manual is part of the product and an important element within the safety
concept.
• Read and follow instruction manual.
• Always keep instruction manual available for the product.
• Pass on instruction manual to all subsequent users of the product.
1. Intended use
The product is applicable for liquids with specific conductivity over 10 µS/cm. The
switching unit can sense the resistance between probes. Conductivity measurement is
suitable only for detecting the presence of liquid at a given level of the tank. This level
is represented by the length of the probe. The conductive switch is suitable for fìlling or
emptying control with 2 to 4 relay outputs working simultaneously or for level detection
of 2-4 independent levels (in 1 or 2 tanks) with 2 independent relay outputs.
2. Safety and responsibility
In order to provide safety in the plant, the operator is responsible for the following
measures:
• Products may only be used for its intended purpose, see intended use
• Never use a damaged or defective product.
Immediately sort out damaged product.
• Make sure that the piping system has been installed professionally and serviced
regularly.
• Products and equipment shall only be installed by persons who have the required
training, knowledge or experience.
• Regularly train personnel in all relevant questions regarding locally applicable
regulations, safety at work, environmental protection especially for pressurised pipes.
The personnel is responsible for the following measures:
• Know, understand and follow the instruction manual and the advices therein.
3. Function
The level switch consists of 1 or 2 switching unit and the KLN-2 type probes. Probes are
to be connected to the 2281 type probe socket head that can be screwed into the tank.
lf the material of the tank or its internal insulation is not conductive then a reference
probe should be used in addition to the one, two, three or four probe(s), if the material of
the tank is conductive, the tank can be used as a reference probe.
4. Technical Data
4.1 Technical Data of the switching unit
Probe Voltage 5 V AC
Probe current < 1 mA AC
Sensitivity Adjustable: 5 kΩ ... 100 kΩ
Max. cable capacity 4 nF
Response max. 400 ms
Setting accuracy (mech.) ± 5 %
Delay Adjustable: 0.5 ... 10 s
Relay output 2x SPDT
Switching voltage 250 V AC1, 24 V DC
Switching current 16A AC1
Switching power 4000 vA AC1. 384 W DC
Electrical strength 4 kV
Mechanical life-span 3 x10
Electrical life-span 0,7x10
Power supply Un 24 V AC/DC
Voltage range allowed nominal voltage -15 %...+100 %
Power consumption max. 2.5 VA/ W
Ambient temperature -20°C ... +55°C
Electrical connection max. 2.5 mm
Electrical protection Class III
Ingress protection IP 20
Mechanical connection DIN EN 60715 rail
Mass 240 g
7
switches
5
switches
2
/ with insulation 1.5 mm
2
19 21
56,5
Separatur KLP-201
Probe KN-2xx
Ø6
38
38
6. Installation
• Mount switching unit on DIN EN 60715 rail.
• Cut the KLN-2 type probes to the length required for level detection on site.
• Screw probes into the sockets.
• Tighten the probe with an M6 nut.
• Use separators at every 0.5 m for multiple probe devices to keep the probes apart.
7. Electrical Connection
lf the wall of the tank is conductive no reference probe is needed, ln this case terminal C
is to be connected to the tank. On multiple probe units E1 and E2 are marked with
1,,.4, the reference probe is marked with C. Admissible length of cable between signal
processor and probes depends on cable capacity and conductivity. Make sure E1 in
upper level, E2 buttom level.
Un
A2 E1E2
A1
CS
E1 E2
16 15 252818 26
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
E1 max. probe
E2 min. probe
C reference probe
8. Putting into operation
8.1 Adjustment
The green LED (Un) shows that the unit is on, the energized state of the relays are
indicated by the E1 respectively E2 LEDs. Operating mode, delay ON and delay OFF can
be set with the DIP switch on the front panel. tE1(s) and tE2(s) potentiometers are for
adjusting the delay time. The sensitivity setting (R potentiometer) should comply with lhe
conductivity of the fluid. Do not set sensitivity higher than required because the vapour
precipilation may lead to operation disturbance.
Selection of delay type for input E1
Selection of delay type for input E2
Inversion of function type for input E2
Function selection:
Power supply indicator
1x: monitoring two independent levels
2x: level control
KRK-522
ta: delay OFF
tb: delay ON
ta: delay OFF
tb: delay ON
Function 2x
n
U
E1
E2
Input inverse OFF
Delay type E2 ta
Delay type E1 ta
R(kΩ)
Adjustment for probe sensitivity
tE1(s)
tE2(s)
1x
ON
tb
tb
Delay adjustment for E1
Delay adjustment for E2
Page 2
E1
8.4 Level control
U
n
U
Georg Fischer Piping Systems Ltd CH-8201 Schaffhausen
Phone +41(0)52 631 30 26 / info.ps@georgfischer.com /
www.gfps.com
GFDO 6354_4 (07.14)
© Georg Fischer Rohrleitungssysteme AG
CH-8201 Schaffhausen/Schweiz, 2014
Printed in Switzerland
8.2 Level detection
The relay allows level detection of 2 independent levels even in one tank or in two
separated tanks.
n
C
E2
A2 E1E2
A1
CS
E1
15 2528
16
18 26
E2
C
E1
A1 A2 E1E2CS
C
E2
E1
16 15 252818 26
Output relay for pump control.
Selection of contacts depends on required function.
9. Maintenance, Repair
The device does not require regular maintenance. Repair within and beyond the wananty
period is carried out at the manufacturer‘s location.
10. Storage
• Ambient temperature: -30 to +70 °C
• Relative humidity: max. 85%
11. Disclaimer
The technical data are not binding. They neither constitute expressly warranted characteristics nor guaranteed properties nor a guaranteed durability.
They are subject to modification. Our General Terms of Sale apply.
level control level control
8.3 State of relays
Un
E1
level
E2
E1
E2
E1
E2
E1
E2
E2
ta
ta
ta
tb
ta
ta
tb
ta
tb
tb
tb
ta
tb
tb
tb
ta
Function 2x
Input inverse OFF
Delay type E2 ta
Delay type E1 ta
Function 2x
Input inverse OFF
Delay type E2 ta
Delay type E1 ta
Function 2x
Input inverse OFF
Delay type E2 ta
Delay type E1 ta
Function 2x
Input inverse OFF
Delay type E2 ta
Delay type E1 ta
1x
ON
tb
tb
1x
ON
tb
tb
1x
ON
tb
tb
1x
ON
tb
tb
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