Kobold NM Operating Manual

Operating Instructions

for

Liquid Level Transducer

Model: NM-..

NM

1. Contents

1. Contents........................................................................................................2

2. Note ..............................................................................................................3

3. Regulation Use .............................................................................................3

4. Operating Principle .......................................................................................4

5. Instrument Inspection....................................................................................5

6. Mechanical Connection.................................................................................5

7. Electrical Connection ....................................................................................6

7.1. General................................................................................................6

7.2. Level Sensors with remote Sensor......................................................6

7.3. Operation in explosion-hazardous zones 1 or 2 ..................................7

8. Technical Information....................................................................................8

9. Order Codes .................................................................................................8

10. Maintenance .................................................................................................9

11. Assistance in Case of Problems .................................................................10

Manufactured and sold by:

Kobold Messring GmbH

Nordring 22-24

D-65719 Hofheim

Tel.: [phone]

Fax: [phone]

E-Mail: [e-mail]

Internet: www.kobold.com

page 2 NM 07/04

2. Note

Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
The devices are only to be used, maintained and serviced by persons familiar
with these operating instructions and in accordance with local regulations
applying to Health & Safety and prevention of accidents.

When used in machines, the measuring unit should be used only when the
machines fulfil the EWG-machine guidelines.

3. Regulation Use

Kobold level transducers are used for the continuous level indication and level
control of all kinds of liquids. The simple design with only one moving part (the
float) allows for demanding applications where special reliability is demanded.
Kobold level transducers allow the continuous level indication and level control of
liquids unaffected by electrical conductivity, temperature, pressure or viscosity.
The level transducer may only be used in liquids that will assure free movement
of the float. The following points must be noted:

NM

• no large particles

• density of the fluid must not be less than that specified for the float type

• viscosity, pressure and temperature to be held within the limits given in the

technical specifications.

• no corrosive media

A variety of transducers in various designs, connecting configurations and
materials are available for the acquisition of the measuring values. The analogue
control instruments provide an electrical output signal which can be changed over
from 0-20 to 4-20 mA and stepless adjustable relay contacts for level control.
They may also contain integral level indicating circuitry (option RM).

NM 07/04 page 3