GF 2281 User manual

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 filling /
emptying control or level limit.
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 and 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 a switching unit and the KLN-2 type probes. Probes are to
be connected to the 2281 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 3.5 V AC
Probe current < 0.5 mA AC
Sensitivity Adjustable: 5 kΩ ... 100 kΩ
Max. cable capacity 800 nF
Response max. 400 ms
Setting accuracy (mech.) ± 5 %
Delay Adjustable: 0.5 ... 10 s
t1delay 1.5 s
Relay output 1x SPDT
Switching voltage 250 V AC1, 24 V DC
Switching current 8A AC1
Switching power 2500 vA AC1. 240 W DC
Electrical strength 3.75 kV
Mechanical life-span 3 x107switches
Electrical life-span 0,7x105 switches
Power supply Un 24V-240V 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 mm2/ with insulation 1.5 mm2
Electrical protection Class II.
Ingress protection IP 20
Mechanical connection DIN EN 60715 rail
Mass 72 g
5. Dimensions
Switching unit: 2281-1-Relay Probe KLN-2XX
64
45
67,5
90
3,4
35
35
16
17,6
14
Probe socket 2281 Separator KLP-201
89
M20x1,5
1 ½BSP
M6
12180
33
43
12
C
38
38
Ø6
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.
max
min
A1, A2 - power supply
C - reference probe
E1 - upper level probe
E2 - bottom level probe
15, 16, 18 - relay output
A1 A2
E1 E2
16 C
15 18
Un
Georg Fischer Piping Systems Ltd CH-8201 Schaffhausen
Phone [phone] / [e-mail] /
www.gfps.com
GFDO 6353_4 (07.14)
© Georg Fischer Rohrleitungssysteme AG
CH-8201 Schaffhausen/Schweiz, 2014
Printed in Switzerland
Instruction manual
2281 Conductive multipoint switch
with single channel relay
GF Piping Systems

Georg Fischer Piping Systems Ltd CH-8201 Schaffhausen
Phone [phone] / [e-mail] /
www.gfps.com
GFDO 6354_4 (07.14)
© Georg Fischer Rohrleitungssysteme AG
CH-8201 Schaffhausen/Schweiz, 2014
Printed in Switzerland
8. Putting into operation
8.1 Adjustment
The green LED (Un) shows that the unit is on, and the energized state of the relay is
indicated by the red LED. Operating mode and delay time (ON and OFF) can be set with
the rotary selector switch and potentlometer on the front panel.
To set the sensitivity using SENS potentiometer do the following: submerge all probes
into the fluid. Set a minimal delay time (t). Adjust the sensitivity from min. to max. value
until the relay becomes energized. Now set the sensitivity a little higher, but don‘t set a
higher sensitivity than needed.
Power supply terminals
Probe connection terminals
Output indicator
(red LED)
Probe connection terminal
Output terminals
Delay adjustment
Function
Probe sensitivity adjustment
Power supply indicator
(green LED)
1
2
3
456 7
8
9
10
Un
E1 E2
A1 A2
16 C
15 18
8.2 LED Indication
Green LED is on • power supply is on
Red LED is on • relay is switched on (contacts 15 and 18 are closed)
Red LED is off • relay is disconnected (contacts 15 and 16 are closed)
Red LED is blinking • output delay indication
8.3 Single-Level monitoring limit switching
lf only one level is monitored, the sensor probe should be connected to both E1 and
E2 terminals. For High Fail-safe mode indication the‘PUMP‘ switch should be in ‚UP‘
position and for Low level alarm indication in ‚DOWN‘ posìtion. Level alarm conditions
are indicated in the same way (by de-energized relay state) as when a power cut-off
occurs.
8.4 Level control
The level switch can be used for control of tilling or emptying. During fìlling control
the ‚PUMP‘ switch should be in position ‚UP‘ and during emptying control in position
‚DOWN‘. That way in case a power supply outage occurs (energized relay) overfilling or
unwanted emptying is prevented
.
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 cha-
racteristics nor guaranteed properties nor a guaranteed durability.
They are subject to modification. Our General Terms of Sale apply.
A1 A2
E1 E2
16 C
15 18
E2C
E1
max
min
Un
FILLING
Un
max
level
min
EMPTYNG
Un
max
level
min
tt
tt
t1
t1
tt
tt
A1 A2
E1 E2
16 C
15 18
max
U
n