Kobold NV Series User manual

Operating Instructions

for

Level Switches

Model: NV

Page 2 NV K08/0917

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 .......................................................... 5

8.Commissioning ................................................................... 5

9.Maintenance ....................................................................... 5

10.Technical Information ......................................................... 6

11.Order Codes ....................................................................... 7

12.Dimensions......................................................................... 7

13.EU Declaration of Conformance ......................................... 8

Manufactured and Marketed 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

NV K08/0917 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 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

Operating Instructions

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.

Page 4 NV K08/0917

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.

NV K08/0917 Page 5

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.

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.

Page 6 NV K08/0917

10.Technical Information

Housing: NV-11...: brass, Ms 58

NV-12...: stainless steel, 1.4301

Connections: NV-11...: brass, Ms 58

NV-12...: stainless steel, 1.4301

Float: stainless steel, 1.4301

Leaf spring: stainless steel, 1.4310

Balance arm: stainless steel, 1.4310

Sleeve: NV-11...: brass, Ms 58

NV-12...: stainless steel, 1.4301

Contact tube: Polyamide

Seal: NV-11...: NBR

NV-12...: FPM

Max. temperature: 110 °C

Max. pressure: 16 bar

Installation position: horizontal

Bistable reed contact:

R N/O contact / N/C contact standard

max. 2 A, max. 230 VAC/DC

max. 40 W, 40 VA

UChangeover contact standard

max. 0,5, max. 150 VAC/DC

max. 20 W, 20 VA

CN/O contact / N/C contact

2 A, 20 VAC, 0.18 A, 230 VAC

max. 40 W

DChangeover contact

0.13 A, 150 VAC, 0.5 A, 40 VAC

max. 20 W

Elektr. Anschluss: PVC-Kabel

Electrical connection: 1.5 m cable, PVC

Contact resistance: max. 80 mΩ

Closing point: max. 6 mm (above centre line)

Opening point: max. 3 mm (below centre line)

Switching hysteresis: approximately 8 mm

Ex-area: ATEX Zone 1 as “Simple operator”

Density: > 0.8 kg/dm3 ...25 mm float

> 0.7 kg/dm3...50 mm float

Protection: IP 65

Average electrical switch contact life (MTTF):

at max. electrical load: 105 switching operations

at half load (<10% max. load): 5*107 switching operations

at low load (<10V/<1mA): 108 switching operations

USC

NV K08/0917 Page 7

11.Order Codes

Example: NV-1101 R1

Model Material Connection/

Length of float Contact type, Cable type/length

NV- 11 = brass

12 = st.st.

01 = G ¾; 25 mm

02 = M27x1.5; 25 mm

03 = G ¾; 50 mm

04 = M27x1.5; 50 mm

R=N/O contact

(Standard CE)

C=N/O contact

(cCSAus)

U=Changeover contact

(Standard CE)

D=Changeover contact

(cCSAus)

PVC cable

1 =1.5 m (standard)

2 =2.0 m1)

4 =3.0 m1)

6 =4.0 m1))

8 =5.0 m1)

P= PVC-cable, special length2)

S = silicone cable2)3)

G = yellow PUR cable2)3)

1) only for N/O contact “R” and “C”

2) length as described

3) only for N/O contact “R”

12.Dimensions

155 resp. 130

AF 32

AF 30

94 50 or 25

G3/4 or M27x1.5

min. 63

Page 8 NV K08/0917

13.EU Declaration of Conformance

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

responsibility that the product:

Level Monitor model: NV...

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

EN 61010-1:2011

Safety requirements for electrical equipment for measurement, control and

laboratory use – Part 1: General requirements

EN 60529:2014

Protection through housing (IP-Code)

Also the following EC guidelines are fulfilled:

2014/35/EU Low voltage guidelines

2011/65/EU RoHS

EN 50581:2012 Technical documentation for the assessment of electrical

and electronic products with respect to the restriction of hazardous substances

Hofheim, 12. Sept. 2017

H. Peters M. Wenzel

General Manager Proxy Holder

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