Kari 3L, 3Y, 3H, 3HE, 3LE Operation Manual

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KARI Float Switch

Operation

Manual

3H 3L 3Y 3A 3HE 3LE 3YE 3AE

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.

Start

Large amount of liquid. Discharging pump starts.

Stop

Lower limit for discharging. Discharging pump stops.

Image 3H shows the operation of the KARI Float Switch

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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, troublefree 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.

FUNCTIONS

DISCHARGING-PUMP CONTROL CHARGING-PUMP CONTROL

Discharging-pump control + high level alarm.

Pump control with one switching element.

Discharging-pump control + isolated high level alarm. Pump control with one switching

3HE

element.

Discharging-pump control + high level alarm

Pump control with two switching elements.

Discharging-pump control + isolated high level alarm. Pump control with two switching

3YE

elements.

ORDER CODE

3HE

K N Au

Gold-plated contacts (Au)

1 mA ... 100 mA

Heat-resistant cable types

N = TPU S = silicone

T = teon

U = UL/CSA PVC

Cable types

Empty = PVC A = rubber N = TPU S = silicone T = teon U = UL/CSA PVC K = heat-resistant

Circuit diagram

3H, 3L, 3Y, 3A, 3HE, 3LE, 3YE, 3AE

Deviating surface levels (cm)

Dxx-xx

Special type ID

Vxx

Charging-pump control + low level alarm.

Pump control with one switching element.

Charging-pump control + isolated low level alarm. Pump control with one switching

3LE

element.

Charging-pump control + low level alarm.

Pump control with two switching elements.

Charging-pump control + isolated low level alarm. Pump control with two switching

3AE

elements.

_KP

_20

Cable length

(m)

1st letter

Non-standard cable weight K = 700 g L = 1000 g

2nd letter

P = pressure-resistant

3H | 3L | 3Y | 3A | 3HE | 3LE | 3YE | 3AE

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INSTALLATION AND ADJUSTMENT

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.

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).

A) B)

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 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 3.

Up!

Image 5. Note the correct

orientation of the oat.

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CIRCUIT DIAGRAM

U V

Alarm Start

Stop

DISCHARGING-PUMP CONTROL + HIGH LEVEL ALARM

Pump control with one switching element.

High level alarm

6...250 V

L1 L2 L3 PE

1-2

1-3

Circuit closed

Circuit open

U V

Stop

Start Alarm

Low level alarm

6...250 V

L1 L2 L3 PE

1-2

1-3

Circuit closed

Circuit open

CHARGING-PUMP CONTROL + LOW LEVEL ALARM

Pump control with one switching element.

2 3

U V

Alarm Start

Stop

High level alarm

6...250 V

L1 L2 L3 PE

1-4

1-3

1-2

Circuit closed

Circuit open

DISCHARGING-PUMP CONTROL + HIGH LEVEL ALARM

Pump control with two switching elements. Take note of the auxiliary contact of the contactor.

2 3

CHARGING-PUMP CONTROL + LOW LEVEL ALARM

Pump control with two switching elements. Take note of the auxiliary contact of the contactor.

3H | 3L | 3Y | 3A | 3HE | 3LE | 3YE | 3AE

Stop

Start Alarm

Low level alarm

6...250 V

L1 L2 L3

1-2

1-3

1-4

Circuit closed

Circuit open

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3HE

Alarm Start

U V W

Stop

1-2

3-4

High level alarm

6...250 V

L1 L2

L3 PE

Circuit closed

Circuit open

DISCHARGING-PUMP CONTROL + ISOLATED LOW LEVEL ALARM

Pump control with one switching element.

3LE

4 3

U V

Stop

Start Alarm

1-2

Low level alarm

6...250 V

L1 L2 L3 PE

3-4

Circuit closed

Circuit open

CHARGING-PUMP CONTROL + ISOLATED LOW LEVEL ALARM

Pump control with one switching element.

3YE

2 3

U V

Alarm Start

Stop

High level alarm

6...250 V

L1 L2 L3 PE

4-5

1-3

1-2

Circuit closed

Circuit open

DISCHARGING-PUMP CONTROL + ISOLATED HIGH LEVEL ALARM

Pump control with two switching elements. Take note of the auxiliary contact of the contactor.

3AE

5 4

2 3

Stop

Start

Alarm

Low level alarm

6...250 V

L1 L2 L3

4-5

1-3

1-2

Circuit closed

Circuit open

CHARGING-PUMP CONTROL + ISOLATED LOW LEVEL ALARM

Pump control with two switching elements. Take note of the auxiliary contact of the contactor.

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CONNECTION EXAMPLES

Control of two pumps with 3H or 3Y

Pump 1

Pump 2

U V W

Start 2 Start 1

Stop 1 and 2

N L1 L2 L3

L N L1 L2 L3

1-2

1-3

Circuit closed

Circuit open

2 3

Pump 1

Pump 2

U V W

Start 2 Start 1

Stop 1 and 2

TECHNICAL INFORMATION

Switching element Microswitch

Voltage 6 ... 250V AC

Max. rated current 6A res., 3A ind.

Rated current with gold-plated contacts

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)

Cable length 5 m (other lengths supplied to order)

Weight of 5 m cable

Largest diameter

Length of oat casing

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

1 mA ... 100 mA

200 mm ... 1200 mm

1,6 kg... 1,9 kg

170 mm

155 mm

N L1 L2 L3

1-4

1-3

1-2

Circuit closed

Circuit open

3H | 3L | 3Y | 3A | 3HE | 3LE | 3YE | 3AE

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OPERATING CURVES TO

Switching height differential

FLOAT SWITCH ADJUSTMENT

120

100

30 50 70 90

Distance of the weight from the float

Weight

The dimensions in the drawings are for

illustrative purposes only.

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.

THE DIMENSIONS OF KARI FLOAT SWITCH

55 mm

100 mm

155 mm

ø170 mm

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.

ROHS

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