Kobold NST Manual de usuario

Operating Instructions

for

Float Switch

Model: NST

NST

page 2 NST K06/0422

1. Contents

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

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

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

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

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

6.Mechanical Connection ................................................................................. 4

7.Electrical Connection .................................................................................... 4

7.1General ................................................................................................ 4

7.2Connection example ............................................................................ 5

8.Technical Information .................................................................................... 6

9.Order Codes ................................................................................................. 6

10.Dimensions ................................................................................................... 7

11.EU Declaration of Conformance ................................................................... 8

Manufactured and sold by:

Kobold Messring GmbH

Nordring 22-24

D-65719 Hofheim

Tel.: +49(0)6192-2990

Fax: +49(0)6192-23398

E-Mail: [email protected]

Internet: www.kobold.com

NST

NST K06/0422 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.

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:

 Float Switch model: NST

4. Regulation Use

Any use of the Float Switch, model: NST, 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.

NST

page 4 NST K06/0422

5. Operating Principle

The ﬂoat comprises a hollow cylinder or a ball with integrated Reed contact or

microswitch.

The switch is supplied as a changeover contact; it can be connected as a N/O

contact or N/C contact as an option. The contact switches when the liquid passes

above or below the horizontal ﬂoat position.

The switch point is set either by the side installation of the switch at the desired

height or by clamping the cable. In case of installation from the top, switchpoint

will stabilize itself through the bading weights.

6. Mechanical Connection

Before installation:

 Remove the transport locks and make sure that there are no more packaging

parts on the device.

 Check whether the maximum allowable operating pressures and temperatures

of the device are not exceeded (see technical data).

 If possible, should already be in accordance with the mechanical installation,

check whether the connection fitting is tight.

As contact protection, concerning protection against contact, we recommend our

contact protection relay MSR.

Installation

 From the inside via G ½ threaded (only type NSTB)

 Externally by means of G 2 fitting

7. Electrical Connection

7.1 General

Attention! Make sure that the maximum voltage power values of

the level switch are not exceeded.

With rising levels: black/ blue: NO

black/ brown: NC

NST

NST K06/0422 page 5

7.2 Connection example

NST

page 6 NST K06/0422

8. Technical Information

Typ NST…: PTFE

Float material: PTFE

Bellows: PTFE (model NST-B only)

Cable: Model NST-A: 2 m FEP cable

Model NST-B: 2 m silicone or FEP cable

Max. pressure: 1 bar

Max. temperature: 150 °C (TPK cable)

Medium density: > 0,79 kg/ dm³

Contact: Reedcontact, connectable as N/O or N/C

Switch capacity: 4...250 VAC/DC

1 mA...1 A, 60 VA

Switch hysteresis: ca. 100 mm

Switch angle: +20° / -20°

Protection: IP 68

9. Order Codes

Example: NST-AW 02 FEP

Model Description

NST-

NST-Anschl. R50A

NST-Anschl. R50B

AW 02 FEP = standard-design, 2 m FEP-cable

BW 02 FEP = PTFE bellows, 2 m FEP-cable

BW 02 SIL = PTFE bellows, 2 m SIL-cable

PTFE cable gland, G 2, for standard design

PTFE cable

land, G 2, for bellows

NST

NST K06/0422 page 7

10. Dimensions

NST

page 8 NST K06/0422

11. EU Declaration of Conformance

We, KOBOLD Messring GmbH, Hofheim-Ts, Germany, declare under our sole

responsibility that the product:

Float Switch Model: NST

to which this declaration relates is in conformity with the standards noted below:

EN 61010-1:2010 + A1:2019 + A1:2019/AC:2019 Safety requirements for

electrical equipment for measurement, control and laboratory use - Part 1:

General requirements

EN 61326-1: 2013

Electrical equipment for measurement, control and laboratory use - EMC

requirements - Part 1: General requirements

Also, the following EC guidelines are fulfilled:

2014/30/EU EMC Directive

2014/35/EU Low Voltage Directive

2011/65/EU RoHS (category 9)

2015/863/EU Delegated Directive (RoHS III)

Hofheim, 21 April 2022

H. Volz M. Wenzel

General Manager Proxy Holder

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