Kobold NMT User manual

Operating Instructions
for
Magnetostrictive Level Meter
Model: NMT/NBK-T

NMT/NBK-T
Seite 2 NMT/NBK-T K05/0123
1. Contents
1.Contents ............................................................................. 2
2.Note .................................................................................... 3
3.Instrument Inspection ......................................................... 3
4.Regulation Use ................................................................... 4
5.Operation Principle ............................................................. 4
6.Mechanical Connection ...................................................... 4
7.Electrical Inspection ............................................................ 5
8.Commissioning ................................................................... 5
9.Maintenance ....................................................................... 5
10.Technical Information ......................................................... 6
11.Order Codes ....................................................................... 6
12.Dimensions ......................................................................... 6
13.Disposal .............................................................................. 7
14.EU Declaration of Conformance ......................................... 8
15.UK Declaration of Conformity ............................................. 9
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

NMT/NBK-T
NMT/NBK-T K05/0123 Seite 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 with the prevailing regulation applying to
procedural safety and the prevention of accidents.
When used in machines, the measuring unit should be used only when the
machines fulfil the EC machinery directive.
3. Instrument Inspection
These devices are checked before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of
the delivery packing. In case of damage, please inform your parcel service/
forwarding agent immediately, since they are responsible for damages during
transit.
Scope of delivery NMT:
 Magnetostrictive Level Meter, model: NMT
Scope of delivery NBK-…T:
The standard scope of delivery includes:
 Sensor with transmitter type: NBK-…T

NMT/NBK-T
Seite 4 NMT/NBK-T K05/0123
4. Regulation Use
The level meter is to be installed only in the specified applications. Any usage
which exceeds the specifications is considered to be non-specified. Any damages
resulting therefrom are not the responsibility of the manufacturer. The user
assumes all risk for such usage. The application specifications include the
installation, start-up and service requirements specified by the manufacturer.
5. Operation Principle
The Kobold level meter NMT/NBK-…T is a very accurate float-controlled sensor
for the continuous measurement of levels.
The principle of measurement is based on echo time measurement. A magne-
tostrictive wire is tensioned in the guide tube. Current pulses are transmitted
through the wire thus generating an annular magnetic field around the wire. The
wire is also magnetized axially by magnets fitted in the float. Due to the superim-
position of both magnetic fields, a torsional impulse is generated in the vicinity of
the float magnet, which propagates with ultrasonic speed in both directions. The
distance from the float magnet to a defined zero-point is measured by an echo
time measurement. The integrated electronics transforms the signal to a stan-
dardized analog signal.
6. Mechanical Connection
NMT
Mount the level meter with guide tube on the vessel.
Use a suitable flat gasket for screwing.
NBK-…T
The measuring transducer is installed and adjusted at the factory on the level
bypass tube.

NMT/NBK-T
NMT/NBK-T K05/0123 Seite 5
7. Electrical Inspection
Connect level meter according to the following wiring diagram:
GND
+Us
AGND
AOUT
+
-
4-20mA
24 V DC
+
-
Terminal assignments
GND: 0 V supply
+US: 24 VDC supply
AGND: analog output GND
AOUT: analog output 4-20 mA
8. Commissioning
The magnetostrictive level meter is ready for operation after mechanical and
electrical connection.
9. Maintenance
The instrument needs no maintenance when the measured medium is not
polluted.
Remove any dirt from guide tube and float with a suitable cleaning agent.
To dismantle the float, undo the retaining washer with the flat-head screw.
For installation after cleaning, secure the flat-head screw with a Locktite fluid to
prevent loosening.

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10. Technical Information
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
11. Order Codes
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
12. Dimensions
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com

NMT/NBK-T
NMT/NBK-T K05/0123 Seite 7
13. 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

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14. EU Declaration of Conformance
We, KOBOLD-Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Magnetostrictive Level Meter model: NMT/NBK-…T
to which this declaration relates is in conformity with the standards noted below:
EN 61000-6-2:2005/AC:2005
Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission
standard for residential, commercial and light-industrial environments
EN 61000-6-3:2007/A1:2011
Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission
standard for residential, commercial and light-industrial environments
EN IEC 63000:2018
Technical documentation for the assessment of electrical and electronic products
with respect to the restriction of hazardous substances.
Also, the following EC guideline is fulfilled:
2014/30/EU EMC Directive
2011/65/EU RoHS (category 9)
Hofheim, 22 March 2023 H. Volz M. Wenzel
General Manager Proxy Holder

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NMT/NBK-T K05/0123 Seite 9
15. UK Declaration of Conformity
We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole
responsibility that the product:
Magnetostrictive Level Meter model: NMT/NBK-…T
to which this declaration relates is in conformity with the standards noted below:
EN 61000-6-2:2005/AC:2005
Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission
standard for residential, commercial and light-industrial environments
EN 61000-6-3:2007/A1:2011
Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission
standard for residential, commercial and light-industrial environments
EN IEC 63000:2018
Technical documentation for the assessment of electrical and electronic products
with respect to the restriction of hazardous substances.
Also, the following UK guidelines are fulfilled:
S.I. 2016/1091 Electromagnetic Compatibility Regulations 2016
S.I. 2012/3032 The Restriction of the Use of Certain Hazardous
Substances in Electrical and Electronic Equipment
Regulations 2012
Hofheim, 22 March 2023
H. Volz M. Wenzel
General Manager Proxy Holder