Kari 3L User manual

3H 3L 3Y 3A 3HE 3LE 3YE 3AE
3
Start
Large amount of liquid.
Discharging pump starts.
High level alarm
Issued when the level of liquid
gets too high, or initiates valve
discharging when, for example,
the pump is out of order.
Stop
Lower limit for discharging.
Discharging pump stops.
KARI Float Switch
Operation
Manual
Image 3H shows the operation
of the KARI Float Switch

3H |3L |3Y |3A |3HE |3LE |3YE |3AE
KARI Float Switch
– compact and reliable
The KARI Float Switch is a control device for charging and discharging pumps
and motor and magnetic valves. It is also an alarm device that alerts the
user at specied surface levels. Thanks to its large oat casing (Ø 170 mm),
the KARI Float Switch has a buoyancy that guarantees smooth, trouble-
free operation under all conditions. SGS FIMKO Oy (the Finnish Electrical
Inspectorate) has performed testing in accordance with the Low Voltage
Directive (LVD) and approved the KARI Float Switch for use in non-ammable
liquids at 250 volts.
3H Discharging-pump control + high level alarm.
Pump control with one switching element.
3HE
Discharging-pump control + isolated high
level alarm. Pump control with one switching
element.
3Y Discharging-pump control + high level alarm
Pump control with two switching elements.
3YE
Discharging-pump control + isolated high
level alarm. Pump control with two switching
elements.
3L Charging-pump control + low level alarm.
Pump control with one switching element.
3LE
Charging-pump control + isolated low level
alarm. Pump control with one switching
element.
3A Charging-pump control + low level alarm.
Pump control with two switching elements.
3AE
Charging-pump control + isolated low level
alarm. Pump control with two switching
elements.
FUNCTIONS
ORDER CODE
3HE _20
Circuit diagram
3H, 3L, 3Y, 3A, 3HE, 3LE, 3YE, 3AE
Cable types
Empty = PVC
A = rubber
N = TPU
S = silicone
T = teon
U = UL/CSA PVC
K = heat-resistant
Heat-resistant cable types
N = TPU
S = silicone
T = teon
U = UL/CSA PVC
Gold-plated contacts (Au)
1mA ... 100 mA
Special type ID
Vxx
Deviating
surface levels (cm)
Dxx-xx
1st letter
Non-standard cable weight
K = 700 g
L = 1000 g
2nd letter
P = pressure-resistant
Cable
length
(m)
_KP
K N Au
DISCHARGING-PUMP CONTROL CHARGING-PUMP CONTROL

i
The KARI Float Switch is mounted
to hang from its own cable. The oat
switch oats on the surface of the liquid
and follows the movement of the liquid’s
surface. Functions are controlled in
the various tilt angles of the oat. The
switching distance differential is adjusted
by moving the weight along the cable.
Cable
length
(m)
Installation considerations
•The height at which the oat hangs
and the distance of the cable weight
from the oat can be adjusted. The
differential between the start and stop
levels is at its lowest when the cable
weight is about 10 cm from the tip of
the oat’s strain-relief (see page 7).
•If the viscosity of the liquid is high
or oating to the sides needs to be
restricted, we recommend a heavier
weight of cable, which we supply as
required. The weights are xed to the
cable with a clamp wedge (see Image 1).
•It is important to keep the junction
box in a dry environment. If this is not
possible, the ends of oat switch cables
must be covered with, for example,
protective grease (see Images 2 and 3).
An IP68 junction box is also available.
•The oat switch needs a cable weight
or other anchor point to operate.
•The installation site must be selected
such that the oat cannot become
caught under or stay on top of any
surface or get entangled in other
structures (see Image 4).
•When the oat switch is tested without
being oated, its correct orientation
must be considered: the ‘UP’ mark on
the side of the bottom portion must
face upward. For example, when placed
on the oor on its side, the oat switch
settles into this position because of its
internal keel weight (see Image 5).
•Tying the oat switch from its cable
near the oat to, for example, the
ascension pipe of the pump decreases
the useful life of the cable; the oat
switch should hang freely from its cable
(as shown in Image 6).
Image 1. Cable weights and the hanging loop are
xed to the cable with a clamp wedge (A–B).
Image 2.Avoid extending or
connecting the cable in humid
conditions.
Image 3.
Image 4.Take care to ensure
the free movement of the
oat.
Image 6. Avoid xing the oat such that
a sharp corner can cause kinks or wear to the cable.
Image 5. Note the correct
orientation of the oat.
A) B)
INSTALLATION AND
ADJUSTMENT
Up!

3H |3L |3Y |3A |3HE |3LE |3YE |3AE
CIRCUIT DIAGRAM
2
3
1
3H
M
UL1
L2
L3
PE
V
W
1-2 1-3
Alarm
High level alarm
6...250 V
DISCHARGING-PUMP CONTROL + HIGH LEVEL ALARM
Circuit
open
Start
Stop
Circuit
closed
Pump control with one switching element.
2
3
1
3L
M
UL1
L2
L3
PE
V
W
1-2 1-3
6...250 V
Low level alarm
Stop
CHARGING-PUMP CONTROL + LOW LEVEL ALARM
Start
Alarm Circuit
open
Circuit
closed
Pump control with one switching element.
3Y 1
M
2
3
4
6...250 V
L1
L2
L3
PE
U
V
W
1-4 1-3 1-2
High level alarm
DISCHARGING-PUMP CONTROL + HIGH LEVEL ALARM
Alarm
Start
Stop Circuit
open
Circuit
closed
Pump control with two switching elements.Take note of the auxiliary contact of the contactor.
2
3
4
1
PE
3A
1-2 1-3 1-4
6...250 V
L1
L2
L3
U
V
W
Circuit
closed
Circuit
open
Stop
Start
Alarm
CHARGING-PUMP CONTROL + LOW LEVEL ALARM
Low level alarm
M
Pump control with two switching elements.Take note of the auxiliary contact of the contactor.

3HE 3
1
2
4
U
V
W
L1
L2
L3
PE
1-2 3-4
6...250 V
M
High level alarm
DISCHARGING-PUMP CONTROL + ISOLATED LOW LEVEL ALARM
Circuit
closed
Circuit
open
Alarm
Start
Stop
Pump control with one switching element.
1
2
4
3
6...250 V
L1
L2
L3
PE
3LE
U
V
W
1-2
3-4
M
Low level alarm
Stop
Start
Alarm
CHARGING-PUMP CONTROL + ISOLATED LOW LEVEL ALARM
Circuit
closed
Circuit
open
Pump control with one switching element.
3YE 1
M
2
3
5
4
6...250 V
L1
L2
L3
PE
U
V
W
1-3 1-2
4-5
High level alarm
DISCHARGING-PUMP CONTROL + ISOLATED HIGH LEVEL ALARM
Alarm
Start
Stop Circuit
open
Circuit
closed
Pump control with two switching elements.Take note of the auxiliary contact of the contactor.
1
2
3
5
4
PE
3AE
6...250 V
L1
L2
L3
U
V
W
1-3 1-2
4-5
M
Stop
Start
Alarm
CHARGING-PUMP CONTROL + ISOLATED LOW LEVEL ALARM
Low level alarm
Circuit
open
Circuit
closed
Pump control with two switching elements.Take note of the auxiliary contact of the contactor.

3H |3L |3Y |3A |3HE |3LE |3YE |3AE
CONNECTION EXAMPLES
Control of two pumps with 3H or 3Y
Switching element Microswitch
Voltage 6 ... 250V AC
Max. rated current 6A res., 3A ind.
Rated current with gold-plated contacts 1mA ... 100 mA
Maximum DC power 75 VA (=0,3A, 250V)
Pressure rating for special types 200 kPa
Max. operating temperature +55 °C (+75 °C supplied to order)
Range of adjustment for standard product (start to stop) 200 mm ... 1200 mm
Cable length 5 m (other lengths supplied to order)
Weight of 5 m cable 1,6 kg... 1,9 kg
Largest diameter 170 mm
Length of oat casing 155 mm
Buoyancy in water 6 N
Float material Polypropylene (PP)
Cable insulation (standard) PVC
Other cable options Rubber, TPU, teon, silicone
Water-tightness IP 67
TECHNICAL INFORMATION
2
3
1
3H
MM
UL1
N
L
L2
L3
PE
V
W
L1
N
L2
L3
1-2 1-3
U
V
W
Start 2
Pump 1Pump 2
Circuit
open
Start 1
Stop 1and 2
Circuit
closed
3
1
4
2
3Y
MM
PE
L1
N
L2
L3
1-4 1-3 1-2
L1
N
L2
L3
Start 2
Pump 1
Pump 2
Start 1
Stop 1and 2
U
V
W
Circuit
open
Circuit
closed
U
V
W

55 mm
100 mm
155 mm
ø170 mm
ROHS
THE DIMENSIONS OF KARI FLOAT SWITCH
The switching height differential is adjusted to the required level by means of the
cable weight. Curve B shows the start- and stop-height differential of the KARI Float
Switch in relation to the distance of the weight from the oat. Curve C shows the
corresponding differential between start and alarm levels. Example: For a type 3H
oat switch, if the distance of the weight from the bottom of the oat (A) is 50 cm,
the start/alarm height differential is about 12 cm.
OPERATING CURVES TO
FLOAT SWITCH ADJUSTMENT
The dimensions in
the drawings are for
illustrative purposes
only.
cm
cm
120
60
80
100
40
20
30 50 70 90
C
A
BD
Switching height differential
Distance of the weight from the float
A
B
C
Weight
A QUALITY FINNISH PRODUCT
Our quality control is based on the ISO 9001 quality management
system. Each product is subject to a full operation test.The KARI
Float Switch is also available in versions which fullls the U.S. and
Canadian national safety standards.