Kobold NSM User manual

Operating Instruction
for
Float Switch
Model: NSM

NSM
Page 2 NSM K04/0923
1. Contents
1.Contents ............................................................................. 2
2.Note .................................................................................... 3
3.Instrument Inspection ......................................................... 3
4.Regulation Use ................................................................... 4
5.Operating Principle ............................................................. 4
6.Mechanical Connection ...................................................... 4
7.Electrical Connection .......................................................... 5
8.Maintenance ....................................................................... 5
9.Technical Information ......................................................... 6
10.Order Codes ....................................................................... 6
11.Dimensions ......................................................................... 6
12.Disposal .............................................................................. 7
13.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

NSM
NSM K04/0923 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 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:
Standard scope of delivery applies:
 Float switch, model: NSM

NSM
Page 4 NSM K04/0923
4. Regulation Use
These units of type NSM are employed for purposes of monitoring the filling-level
status of liquids. Only such liquids may be measured which are compatible with
the materials used in the construction of these units.
Float switches are usable as switching elements for level control in almost any
situation, where a two-point control is sufficient to solve the problem under
consideration. These devices are easy to install and practically maintenance-free.
Float switches represent an inexpensive solution while offering high reliability at
the same time.
5. Operating Principle
The float switch consists of a body with built-in micro-switch. The supplied contact
is a change-over type (SPDT), which can be used selectively as a N.O. or N.C.
contact.
The contact switches when exceeding or falling short of the horizontal float
position. Setting switch point is carried out through on-site assembly of the switch
at the desired position by cable-clamping. When top mounting, the switching point
is determined by means of ballast cable weights.
6. Mechanical Connection
The float switch cable is fastened centrally between the lower and upper levels.
The switching angle of the switch is approx. 45°. Thus, the difference in level is
about 1.4 times that of free cable length.
Example: Free cable-length 10 cm
Level difference approx. 14cm
Attention: The bending radius of the cable is 15-times of the cable diameter.
Neoprene cable: approx. 11 cm
The cable should not be bound with strap-hardened cable binder and not in a
vertical direction, if possible. The use of bending protection trumpets is
recommended.

NSM
NSM K04/0923 Page 5
7. Electrical Connection
The maximum electrical load of the switch is indicated on the instrument sticker.
Wiring
Blue
Brown
Black
Green-yellow
N.O
.
N.C.
Yellow-green: Ground
Blue-brown: N.O. with increasing level
Brown-black: N.C. with increasing level
Note! Water can penetrate the cut-end jacketing of the cable and
seep along the line into the switch. Do not allow the liquid to rise
above this end. The wiring should be connected either in a dry area
or in a junction-box, satisfying the safety class IP65 requirement (or
better). The use of a ground-fault-interrupting circuit breaker is
recommended.
After connecting desired external devices to the limit-contact, the device is ready
for use.
8. Maintenance
Providing that, the medium to be measured is not contaminated, the NSM unit is
maintenance-free.

NSM
Page 6 NSM K04/0923
9. Technical Information
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
10. Order Codes
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com
11. Dimensions
Operating instructions, data sheet, approvals and further information via the QR
code on the device or via www.kobold.com

NSM
NSM K04/0923 Page 7
12. 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

NSM
Page 8 NSM K04/0923
13. EU Declaration of Conformance
We, KOBOLD Messring GmbH, Nordring 22-24, 65719 Hofheim, Germany,
declare under our sole responsibility that the product:
Float Switch Type: NSM...
to which this declaration relates is in conformity with the following EU directives
stated below:
2014/35/EU Low Voltage Directive
2011/65/EU RoHS
Also, the following standards are fulfilled:
EN 60730-1:2012 Automatic electrical controls for household and similar use -
Part 1: General requirements
EN 60730-2-15:2011 Automatic electrical controls for household and similar use -
Part 2-15: Particular requirements for automatic electrical air flow, water flow and
water level sensing controls
Hofheim, 19 Sept 2023
H. Volz J. Burke
General Manager Compliance Manager