Kobold NMF User manual

Operating Instructions
for
Membrane Level Monitor
for Bulk Goods
Model: NMF

NMF
page 2 NMF K07/0123
1. Contents
1.Contents ........................................................................................................ 2
2.Note .............................................................................................................. 3
3.Instrument Inspection .................................................................................... 3
4.Regulation Use ............................................................................................. 3
5.Operating Principle ........................................................................................ 4
6.Mechanical Connection ................................................................................. 4
6.1Installation with very coarse-grained and sharp-edged bulk goods ..... 4
7.Electrical Connection .................................................................................... 5
7.1Connection diagram ............................................................................. 5
8.Technical Information / Configuration ............................................................ 6
9.Order Codes ................................................................................................. 6
10.Dimensions ................................................................................................... 6
11.Disposal ........................................................................................................ 7
12.EU Declaration of Conformance ................................................................... 8
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.kobold.com

NMF
NMF K07/0123 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 instruction manuals on our website www.kobold.com are always for currently
manufactured version of our products. Due to technical changes, the instruction
manuals available online may not always correspond to the product version you
have purchased. If you need an instruction manual that corresponds to the
purchased product version, you can request it from us free of charge by email
([email protected]) in PDF format, specifying the relevant invoice number and
serial number. If you wish, the operating instructions can also be sent to you by
post in paper form against an applicable postage fee.
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
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
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 K07/0123
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.
6. Mechanical Connection
6.1 Installation with very coarse-grained and sharp-edged bulk
goods
The installation of guards is recommended for very large grained and sharp-
edged materials with high specific weight.
A proposal for such a guard is
shown in the sketch. The guard
mounted over the level monitor
protects sensor and membrane
against damage from dropping bulk
material. The curtain (made of
rubber or plastic, for instance) protects
the membrane from excessive
wear by hanging against the membrane
as the amount of bulk material
increases. Make sure that
the monitor is not in the path of
the inflowing material, as otherwise
monitor and membrane would be
destroyed very quickly.

NMF
NMF K07/0123 page 5
7. Electrical Connection
7.1 Connection diagram
Attention! Make sure that the voltage values of your system
correspond with the voltage values of the measuring unit.
 Make sure that the supply wires are de-energised.
 Plug in the system according to the connecting diagrams.
Attention! Incorrect wiring will lead to damage of the unit’s
electronics.
NONC C
P
3 or 4

NMF
page 6 NMF K07/0123
8. Technical Information / Configuration
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
9. Order Codes
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
10. Dimensions
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com

NMF
NMF K07/0123 page 7
11. Disposal
Note!
 Avoid environmental damage caused by media-contaminated parts
 Dispose of the device and packaging in an environmentally friendly
manner
 Comply with applicable national and international disposal regulations and
environmental regulations.
Batteries
Batteries containing pollutants are marked with a sign consisting of a crossed-out
garbage can and the chemical symbol (Cd, Hg, Li or Pb) of the heavy metal that
is decisive for the classification as containing pollutants:
Cd1 Hg2 Pb3 Li4
1. „Cd" stands for cadmium
2. „Hg" stands for mercury
3. „Pb" stands for lead
4. „Li" stands for lithium
Electrical and electronic equipment

NMF
page 8 NMF K07/0123
12. EU Declaration of Conformance
We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Membrane Level Monitor Model: NMF-...
to which this declaration relates is in conformity with the standards noted below:
EN 61010-1:2010 Safety requirements for electrical equipment for
measurement, control and laboratory use - Part 1: General requirements
EN 60529:2013 Degrees of protection provided by enclosures (IP Code)
EN 50581:2012 Technical documentation for the assessment of electrical
and electronic products with respect to the restriction of hazardous substances
Also the following EC guidelines are fulfilled:
2014/35/EU Low Voltage Directive
2011/65/EU RoHS (category 9)
2015/863/EU Delegated Directive (RoHS III)
Hofheim, 30 July 2019
H. Peters M. Wenzel
General Manager Proxy Holder