+GF+ 2281 Instruction Manual

GF Piping Systems

Instruction manual

2281 Conductive multipoint switch
with dual channel relay
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 switches
7
Electrical life-span 0,7x10 switches
5
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
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
2 / with insulation 1.5 mm 2
5. Dimensions
Switching unit: 2281-2-Relay
65
19 21
56,5
Separatur KLP-201
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.
U
n
A1 A2 C E2 E1 S
E1 E2
16 15 18 28 25 26

8. Putting into operation

8.1 Adjustment
The green LED (U ) shows that the unit is on, the energized state of the relays are
n
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.
ta: delay OFF
Selection of delay type for input E1
tb: delay ON
Selection of delay type for input E2 ta: delay OFF
tb: delay ON
Inversion of function type for input E2
1x: monitoring two independent levels
Function selection:
2x: level control
Power supply indicator
U
n
`relay 1 energised´ indicator
E1
`relay 2 energised´ indicator
E2
R(kΩ)
KRK-522
52
Probe KN-2xx
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
Function 2x
1x
Input inverse OFF
ON
Delay type E2 ta
tb
Delay type E1 ta
tb
Delay adjustment for E1
tE1(s)
Delay adjustment for E2
tE2(s)
Adjustment for probe sensitivity