Kobold NEK Specifications

Conductive Level Switches

for Conductive Liquids

measuring

•

monitoring

•

analysing

NEK

 Pressure: max. 20 bar

 Temperature: max. 85 °C

 Connection:

R ¾ or ¾" NPT

 Material:

PPS/stainless steel
Polypropylene/stainless steel

2/02- 2014

KOBOLD companies worldwide:

ARGENTINA, AUSTRIA, BELGIUM, BULGARIA, CANADA, CHILE, CHINA, COLUMBIA, CZECHIA,
DOMINICAN REPUBLIC, EGYPT, FRANCE, GERMANY, GREAT BRITAIN, HUNGARY, INDIA, INDO­NESIA, ITALY, MALAYSIA, MEXICO, NETHERLANDS, PERU, POLAND, ROMANIA, SINGAPORE,
SOUTH KOREA, SPAIN, SWITZER-LAND, TAIWAN, THAILAND, TUNISIA, USA, VIETNAM

KOBOLD Messring GmbH
Nordring 22-24
D-65719 Hofheim/Ts.

Head Of ce:

[phone]

[phone]
[e-mail]
www.kobold.com

1

Conductive Level Switches Model NEK

Description

The KOBOLD level switch of model NEK is a complete
functional unit which is specially designed for monitoring
conductive liquids under extreme conditions. Due to the
design without any moving or protruding parts, the switches
are very suitable for monitoring critical media with, for example,
solid content, negligible density or high viscosity.
The double-thread allows a variety of installations. The
lengthof the shaft can be extended by attaching an additional
protective tube. The instruments operate on the conductive
principle of measurement. The conductive medium touches
both electrodes causing a negligible alternating current to
fl ow; the output state changes.

Dimensions

Technical Details

Housing: PPS or Polypropylene

Electrodes: stainless steel 1.4571

Connections: R ¾ or ¾" NPT male thread

Operating
temperature: -25 ... +85 °C (PPS)

-25 ... +60 °C (Polypropylene)

Max. pressure: 20 bar (PPS)
6 bar (Polypropylene)

Installation position: horizontal or vertical

Contact components: open collector (NPN or PNP)
wet signal

Option:
relay (fl oating changeover contact)

Electrical connection: 2 m encapsulated cable
3-core screened (open collector)
5-core unshielded (relay)

Supply: 18-29 V

, < 20 mA

DC

Switch-in delay: dry/wet: 0.5 s
wet/dry: 0.5 s

Sensitivity: approx. 50 kΩ

Min. conductance: approx. 100 μS/cm

Switch capacity: Open Collector:
max. 32 V / max. 100 mA
short-circuit-proof

Relay:
max. 1 A / 30 V
short-circuit-proof

Protection: IP 68

Applications

 Chemical tanks

 Fresh-water tanks

 Mixing vessels

 Run-dry protection for pumps

Order Details (Example: NEK-1136 R20 C)

Immersion

length

36 mm

Relay (changeover contact) NEK-3136... NEK-3236...

73 mm

Relay (changeover contact) NEK-3173... NEK-3273...

2

Contact Model

Open collector (NPN) NEK-1136... NEK-1236...

Open collector (PNP) NEK-2136... NEK-2236...

Open collector (NPN) NEK-1173... NEK-1273... ...N20... = ¾ NPT

Open collector (PNP) NEK-2173... NEK-2273...

PPS Polypropylene

www.kobold.com

Mechanical
connection

...R20... = R ¾

Electrical

connection

...C = 2 m PVC cable

No responsibility taken for errors;

subject to change without prior notice.

2/02- 2015