65

LEVEL SWITCHES

MAGNETIC COUPLING LEVEL SWITCHES NIVOMAG

MAIN FEATURES

APPLICATIONS

Overflow protectionLevel controlsSupplementary fail safeswitch if combined with other devicesWater tanks, feedwater tanksFuel tanksPower plants

CERTIFICATIONS

ATEX II 1/2 G EEx dme II C T6…T2 (TÜV) IECEx II 2 G EEx dme IIC T6…T2SIL 1 Safety Integrity LevelGermanischer Lloyd (GL)Det Norske Veritas (DNV)Bureau Veritas (BV)

Magnetic coupling between the switch and the floatOperation w/o external power supplySide or top mounted versionsUnderwater versionFixed or variable hysteresisMax. 250°C medium temperatureExplosion proof versionIP 65/68 protection

GENERAL DESCRIPTION

TYPE SELECTION

NIVOMAG MK-200 series magnetic float level switches are used for point level detection and level control of liquids in all types of vessels. Operation principle: the permanent magnetof the float activates the output microswitch by a non-contact coupling system.The great variety of both the top and side mounted versions makes it easy to install the switch in any tank at any location. For the simplest level switching you can select models withfixed hysteresis, while for level control application we offer NIVOMAG switches with adjustable hysteresis. Models with rubber or silicon sleeves can be applied for contaminated liquids.You can fit the NIVOMAG switch with an MMK type tester, to check the switching function even when the liquid levels aren’t changing.

To assist in the selection of the correct model the following tables and diagrams are provided. When selecting a modeldue consideration must be given to liquid density, mounting position and process connection and to determine if thereis a need for adjustable or fixed hysteresis or a rubber sleeve.

Minimum liquid density (kg/dm3)

Arm length (mm)0 –100 200 300 1000-

3000Max. float Ø (mm)

52 0.7 0.8 0.85 –

64 0.7 0.8 0.8 –

124 – – – 0.7

Type MK-21 MK-22 MK-23

Fixed switching differential

Adjustable switching differential

Straight arm

L or Z arm

Side mounted

Top mounted (with „L” arm)

Submersible

Rubber protection sleeve

Flanged process connection *

Threaded process connection

Ex version

Tester

* Only with 92x92 flange

MKA-210-�

MKG-210-�

MKA-220-�

MKA-230-�MKA-210-� + MMK-120 tester

LEVE

L SW

ITCH

ES

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LEVEL SWITCHES

LEVEL SWITCH

ES

MAGNETIC COUPLING LEVEL SWITCHES NIVOMAG

Temperature specification for Ex versions Temperature diagram:

ADDITIONAL DATA FOR EX CERTIFIED MODELS

Temperature classes

Class T6 T5 T4 T3 T2

Max. mediumtemperature +80°C +95°C +130°C +200°C +250°C

Ambient temperature

–20°C…+60°C

–20°C…+70°C

–20°C…+80°C

–20°C…+80°C

–20°C…+80°C

TECHNICAL DATA

TypeCylindrical float (side and top mounting) Ball float (top mounting)

MKA-21MKU-21 MKA-22 MKG-21

MKV-21MKS-21MKZ-21 MKA-23

Nominal pressure 2.5 MPa (25 bar) [MKU: 0.2/2.5 MPa (2 bar/25 bar)] 2.5 MPa (25 bar)

Medium temperature see temperature diagram

Ambient temperature –20°C…+80°C, Ex version: see temperature specification for Ex version table

Liquid density min. 0.7–0.85 kg/dm3, see min. liquid density table

Switching differential Fixed Adjustable Fixed Fixed Adjustable

Insertion length 202…521 mm 245…573 mm 202…521 mm 1265…3265 mm

Material of wetted parts Stainless steel (1.4571, 1.3960, 1.4404), and MKG: rubber, MKS: silicone

Housing material Paint coated aluminium

Microswitch 1 micro-switch with 1 closing and 1 opening contact (NO and NC) *

Switch ratingStandard 250V 10A AC12; 220V 0.6A DC13

Ex version 250V 2.5A AC12; 220V 0.3A DC13

Electrical connection M20x1.5 cable gland, terminal (MKU, MKV, MKZ integrated cable NSSHöu-J 5x1.5 mm2, Ø15 mm) **

Ingress protection IP65 (MKU, MKV, MKZ IP68 up to 20 m underwater)

Electrical protection Class I.

Safety integrity level SIL1

Ex marking ATEX 1/2 G EEx dme IIC T6…T2 (TÜV) ; IEC Ex 2 G EEX dme IIC T6…T2

Mass _ 1.8 – 3.5 kg

* NO and NC terminals should be connected to equipotential circuits ** Cable length should be specified when ordered

MKU-210-�

MKA-210-4 with „L” arm

MKA-210-4 with „Z” arm

MKA-21�-�with flanged process

connection

MKA-21�-�with threaded process connection

MFF-110counter flange

MFF-111 counter flange+ MMK-120 tester

NIVOMAG MK-21

Germanischer Llyod (GL) and Det Norske Veritas certified magnetic float level switch

with fixed switch differential

All wetted parts stainless steel (1.4571, 1.3960, 1.4404), paint coated Alu-housing with IP65

Ex marking: ATEX x II 1/2 G EEx dme IIC T6…T2; IEC Ex 2G EEx dme IIC T6...T2*

Type

M K X 2 1 X X

Version

M K 2 1 X X

A Standard

G With rubber protection sleeve (not available in Ex version)

S With silicon protection sleeve (not available in Ex version)

U Underwater (IP68)

V Underwater (IP68), with rubber protection sleeve (not available

in Ex version)

Z Underwater (IP68), with silicon protection sleeve (not available

in Ex version)

Process connection

M K X 2 1 X

0 Square flange

B 2"BSP**

N 2"NPT**

1 DIN DN 80 PN 40, steel**

2 DIN DN 100 PN 40, steel**

5 DIN DN 80 PN 40, stainless steel**

6 DIN DN 100 PN 40, stainless steel**

Protrusion / Arm length / Approval

M K X 2 1 X

0 202 mm (189 mm for MKA-21B, 178 mm for MKA-21N)

1 321 / 100 mm

2 421 / 200 mm

3 521 / 300 mm

4 L or "Z" profile (specify dimensions when ordering)

9 202 mm (189 mm for MKA-21B, 178 mm for MKA-21N) / Ex

5 321 / 100 mm / Ex

6 421 / 200 mm / Ex

7 521 / 300 mm / Ex

8 "L" or "Z" profile (specify dimensions when ordering) / Ex

M K 2 1

* Need of IEC is to be specified with order ** Not available with protection sleeve

NIVOMAG MK-22

Germanischer Llyod (GL) and Det Norske Veritas certified magnetic float level switch

with adjustable switch differential

All wetted parts stainless steel (1.4571, 1.3960, 1.4404), paint coated Alu-housing with IP65

Ex marking: ATEX x II 1/2 G EEx dme IIC T6…T2

Type

M K X 2 2 X X

Version

M K 2 2 X X

A Standard

U Underwater (IP68)

Process connection

M K X 2 2 X

0 Square flange

1 DIN DN 80 PN 40, steel

2 DIN DN 100 PN 40, steel

5 DIN DN 80 PN 40, stainless steel

6 DIN DN 100 PN 40, stainless steel

Protrusion / Arm length / Approval

M K X 2 2 X

0 254 mm

1 373 / 100 mm

2 473 / 200 mm

3 573 / 300 mm

9 254 mm / Ex

5 373 / 100 mm / Ex

6 473 / 200 mm / Ex

7 573 / 300 mm / Ex

M K 2 2

Cable for MKU underwater version NIV24

To be specified in the order; each started 1 m NIVOMAG MKA-210-0

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LEVEL SWITCHES

MAGNETIC COUPLING LEVEL SWITCHES NIVOMAG

LEVE

L SW

ITCH

ES

NIVOMAG MKA-210-_

NIVOMAG MKG-210-_

NIVOMAG MKA-210-4Z

NIVOMAG MKA-210-4L

NIVOMAG MKA-21B-0

NIVOMAG MKA-21N-0

NIVOMAG MKA-220

NIVOMAG MK-23

Germanischer Llyod (GL) certified magnetic float level switch with vertical float arm

and adjustable switch differential

All wetted parts are made of stainless steel (1.4571, 1.3960, 1.4404), paint coated Alu-housing with IP65

Ex marking: ATEX x II 1/2 G EEx dme IIC T6…T2

Type

M K X 2 3 X X

Version

M K 2 3 X X

A Standard

Process connection

M K X 2 3 X

0 Square flange

Maximum switch differential (S)

Protrusion / Arm length / Approval

M K X 2 3 X

1 1265 mm / 1000 mm

2 2265 mm / 2000 mm

3 3265 mm / 3000 mm

5 1265 mm / 1000 mm / Ex

6 2265 mm / 2000 mm / Ex

7 3265 mm / 3000 mm / Ex

M K 2 3

NIVOMAG MFF

Counter flange for MK magnetic floats

Type

M F F 1 X X

Material

M F F 1 X

1 Steel

2 Stainless steel (1.3960, 1.4404)

Version

M F F 1 X

0 Standard

1 For units with MMK-100 tester

M F F 1

NIVOMAG MMKTester for MK magnetic floats

Type

M M K 1 1 0 Steel

M M K 1 2 0 Stainless steel

68

LEVEL SWITCHES

MAGNETIC COUPLING LEVEL SWITCHES NIVOMAG

LEVEL SWITCH

ES

NIVOMAG MKA-230

NIVOMAG MFF-110

NIVOMAG MFF-111

NIVOMAG MMK-110