Kobold NV User manual

Operating Instructions
for
Level Switches
Model: NV

NV
Page 2 NV K13/1023
1. Contents
1.Contents ............................................................................. 2
2.Note .................................................................................... 3
3.Instrument Inspection ......................................................... 3
4.Regulation Use ................................................................... 4
5.Operating Principle ............................................................. 5
6.Mechanical Connection ...................................................... 5
7.Electrical Connection .......................................................... 6
8.Commissioning ................................................................... 6
9.Maintenance ....................................................................... 7
10.Disposal .............................................................................. 8
11.EU Declaration of Conformance ......................................... 9
12.UK Declaration of Conformity ........................................... 10
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

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NV K13/1023 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:
 Level Switch model: NV

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4. Regulation Use
Any use of the Level Switch, model: NV, which exceeds the manufacturer’s
specification may invalidate its warranty. Therefore, any resulting damage is not
the responsibility of the manufacturer. The user assumes all risk for such usage.
The units of type NV are intended to be used for monitoring of liquid-level
measurement. Only use liquids which are chemically inert to the materials used in
the construction of these devices.
By using at least two level monitors, where one is used for minimum level and the
other for max. level, liquid level control may be accomplished.

NV
NV K13/1023 Page 5
5. Operating Principle
The Kobold Level Switch model NV is a reasonably-priced compact instrument
for monitoring levels. A stainless steel cylindrical float attached to one end of a
balance arm moves up and down with the liquid level.
The motion of the float is transferred to a permanent magnet fitted at the other
end of the balance arm. The permanent magnet switches a reed contact that is
fitted in a sliding tube outside the medium. The tube is set as a N/O contact at the
factory, that is, the contact closes when the level rises. The switching function is
reversed by moving the tube. The instruments are delivered in standard sleeves
for side installation. PTFE tape is used to seal the switch.
6. Mechanical Connection
The float switch is to be attached in such a way that the float can move freely
over its entire range and must not come in contact with the walls, bottom, or
cover of the container. Positions, where turbulence may be encountered, due to
agitators or intake valves, are unsuitable for proper operation.
The container should not have freely moving solids or ferrite particles, since these
will deposit on float magnet- resulting in disturbance in switching process. If the
liquid contains sediments or suspended materials, special care must be exercised
in order to keep these materials away from the float system.
The switch should be attached to the system while keeping in mind the need for
easy access for installation and maintenance.
 Ensure that the permitted max. operational pressure and temperature limits are
not exceeded.
 Make sure that no remains of packing material exist inside the unit.
 The installation position must be horizontal.
 If possible, examine all the connection joints for proper sealing, just after
mechanical installation.

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7. Electrical Connection
 Make sure that the electric supply lines are not active.
 Connect the cable with your power supply.
 The contact box is made of fibreglass reinforced plastic. This material provides
protective insulation according to VDI 0720 class II; a separate protection
conductor is not required.
Connection scheme
After connections are made to the desired external devices, the unit is ready for
operation.
8. Commissioning
Readjustment of switching unit
For the adjustment of switching unit, the locking disk on the upper part of housing
must be loosened and the switching unit repositioned. To assist the adjustment
procedure, a blue (white) or red arrow is provided on the switching unit. The
leading edge of locking disk serves as adjustment mark.
N.O. contact:
The switching unit is to be set within the range of red arrow.
The contact closes on increasing liquid-level.
N.C. contact:
The switching unit is to be set within the range of blue (white) arrow.
The contact opens on increasing liquid-level.

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9. Maintenance
As long as the medium to be measured is not contaminated, the device NV is
maintenance-free. In particular, pay attention to ferrite particles in the medium,
which tend to settle on the magnet, and can lead to problems. Larger dirt particles
can cause seizure of the horizontal beam. Depending upon the degree of
pollution of your medium, we recommend checking the device(s) after regular
intervals.
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

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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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NV K13/1023 Page 9
14. EU Declaration of Conformance
We, KOBOLD Messring GmbH, Nordring 22-24, 65719 Hofheim, Germany,
declare under our sole responsibility that the product:
Level Monitor model: NV...
to which this declaration relates is in conformity with the following EU directives
stated below:
2014/35/EU Low voltage guidelines
2011/65/EU RoHS
2015/863/EU Delegated Directive (RoHS III)
Also, the following standards are fulfilled:
EN 61010-1:2010 + A1:2019 + A1:2019/AC:2019
Safety requirements for electrical equipment for measurement, control and
laboratory use
EN 60529:2014
Protection through housing (IP-Code)
EN IEC 63000:2018 Technical documentation for the assessment of electrical
and electronic products with respect to the restriction of hazardous substances
Hofheim, 10 October 2023
H. Volz J. Burke
General Manager Compliance Manager

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Page 10 NV K13/1023
15. UK Declaration of Conformity
We, KOBOLD Messring GmbH, Nordring 22-24, 65719 Hofheim, Germany,
declare under our sole responsibility that the product:
Level Monitor model: NV...
to which this declaration relates is in conformity with the following UK directives
stated below:
S.I. 2016/1101 Electrical Equipment (Safety) Regulations 2016
S.I. 2012/3032 The Restriction of the Use of Certain Hazardous
Substances in Electrical and Electronic Equipment Regulations 2012
Also, the following standards are fulfilled:
BS EN 61010-1:2010+A1:2019
Safety requirements for electrical equipment for measurement, control, and
laboratory use. General requirements
BS EN 60529:1992+A2:2013
Degrees of protection provided by enclosures (IP-Code)
BS EN IEC 63000:2018
Technical documentation for the assessment of electrical and electronic products
with respect to the restriction of hazardous substances.
Hofheim, 10 October 2023
H. Volz J. Burke
General Manager Compliance Manager