Kobold NMF Series, NMF-ENN, NMF-EVE, NMF-ENE, NMF-FNN Operating Instructions Manual

Operating Instructions

for

Membrane Level Monitor

for Bulk Goods

Model: NMF

NMF

page 2 NMF K04/0218

1. Contents

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

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

3. Instrument Inspection .................................................................................... 3

4. Regulation Use .............................................................................................. 3

5. Operating Principle ........................................................................................ 4

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

6.1 Installation with very coarse-grained and sharp-edged bulk goods ..... 5

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

7.1 Connection diagram ............................................................................. 6

8. Technical Information / Configuration ............................................................ 7

8.1 Model NMF-E... configuration standard ............................................... 7

8.2 Model NMF-F...configuration for greater wall thicknesses ................... 7

8.3 Model NMF-D...configuration with double-membrane .......................... 8

8.4 Model NMF-B...configuration for higher temperatures ......................... 8

9. Order Codes ................................................................................................. 9

9.1 NMF-E ................................................................................................. 9

9.2 NMF-F .................................................................................................. 9

9.3 NMF-D ................................................................................................. 9

9.4 NMF-B ................................................................................................. 9

10.Dimensions ................................................................................................. 10

10.1 NMF-E... ............................................................................................ 10

10.2 NMF-F... ............................................................................................. 10

10.3 NMF-D... ............................................................................................ 11

10.4 NMF-B... ............................................................................................ 11

11.EU Declaration of Conformance .................................................................. 12

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

NMF

NMF K04/0218 page 3

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 EC-machine guidelines.

3. Instrument Inspection

Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of
the delivery packaging. In case of damage, please inform your parcel service /
forwarding agent immediately, since they are responsible for damages during
transit.

Scope of delivery:

The standard delivery includes:

 Membrane Level Monitor model: NMF
 Operating Instructions

4. Regulation Use

Any use of the Membrane Level Monitor, model: NMF, which exceeds the
manufacturer’s specifications, may invalidate its warranty. Therefore, any
resulting damage is not the responsibility of the manufacturer. The user assumes
all risk for such usage.

NMF

page 4 NMF K04/0218

5. Operating Principle

Membrane level monitors allow economic level monitoring of bulk goods in
storage vessels. They may be used to indicate full and empty states and load
demand for dusty, powdery, granulated and grainy bulk goods. They are suitable
for use with bulk materials (0.3 to 2.5 t/m3) and particle sizes up to 30 mm. The
devices will operate faultlessly provided the bulk goods flow easily at not too
small an angle. Only such materials exert sufficient operating pressure on the
detector fitted in the wall of the silo.

The housing made of cast aluminium or glass-fibre reinforced plastic carries the
membrane retained by a screwed-on ring. With its own weight the bulk material
presses against the membrane which is prestressed with a spring through to the
support. A plunger fixed to the membrane transfers the pressure directly to a
microswitch with changeover contact. If the bulk material subsides, the
membrane is relieved and the contact is switched back. The sensitivity can be
adjusted with a spring. The monitor can thus be optimised for the type of fill and
the installation conditions.