Kobold VKG Manuel utilisateur

Operating Instruction

for

Viscosity Compensated

Flow Meter and Monitor

Model: VKG

VKG

Page 2 VKG K09/0322

1. Contents

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

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

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

4.Regulated Use .............................................................................................. 3

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

6.Mechanical Connection ................................................................................. 5

7.Electrical Connection .................................................................................... 6

8.Use in hazardous area .................................................................................. 7

8.1.Statement an apparatus not containing an own potential ignition

source .................................................................................................. 7

8.2.ATEX reed contact 41R57** ............................................................... 9

9.Commissioning............................................................................................ 15

10.Maintenance ............................................................................................... 16

11.Technical Information .................................................................................. 16

12.Ordering Codes ........................................................................................... 18

13.Recommended Spare Parts ........................................................................ 19

14.Dimensions ................................................................................................. 20

15.EU Declaration of Conformance (VKG) ....................................................... 22

16.UK Declaration of Conformity (VKG) ........................................................... 23

17.EU Declaration of Conformance (Reed contact 41R57**) ........................... 24

18.Statement of conformity reed contact 41R57** ........................................... 25

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

VKG

VKG K09/0322 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.

as per PED 2014/68/EU

In acc. with Article 4 Paragraph (3), "Sound Engineering Practice", of the

PED 2014/68/EU no CE mark.

Diagram 8, Pipe, Group 1 dangerous fluids

3. Instrument Inspection

These devices are checked before dispatch and sent away in perfect condition.

Should the 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:

 Viscosity Compensated Flow Meter and Monitor model: VKG

4. Regulated Use

Model VKG instruments are used for the measurement and monitoring of viscous

liquid flows (max. 760 mm2/s). Only clean and homogeneous media may be

measured, which do not affect the materials used in the instrument casing.

Large measuring errors will occur when using higher viscosity media. Large dirt

particles may lead to blocking of the float and therefore to large measurement and

signal errors.

VKG

Page 4 VKG K09/0322

Ferritic particles that deposit on the float body (with internal magnet) may also lead

to a similar effect.

The instruments are provided as follows:

Flow measurement

The actual flow may be read locally off the instrument. The top of the float indicates

directly the flow rate in litres per minute on the scale.

Limit Value Contacts (only for model VKG- 2.. and VKG-3..)

For the monitoring of the flow rate, the instruments may be fitted with one or two

adjustable limit value contacts.

Standard design: Normally open reed contacts (with increasing flow)

Special design: Changeover reed contacts

The contact is adjustable over the full measuring range.

Standard Material Combinations

Material: Brass Material: Stainless Steel

Outer casing

luminium, anodised

Spring St. Steel 301 St. Steel 301

Orifice St. Steel 301 / brass St. Steel 301

Magnet Ceramic oxide Ceramic oxide

Connections Brass St. Steel 304

Float Brass St. Steel 304

Measuring tube Borosilicate Borosilicate

O-rings NBR FPM

Tmax. 100 °C 100 °C

Pmax. 12 ba

12 ba

5. Operating Principle

A float with sharp edged orifice apertures is located within

a cylindrical glass measuring tube. When a flow occurs,

the medium lifts the float against a spring which exerts a

force downwards on the float. Each position of the float

corresponds to a particular flow throughput, which may be

read off the scale marked on the glass measuring tube.

Permanent magnets are mounted on the float which

activates reed switches positioned outside of the flow

throughput. The activation of the contacts is carried out by

means of magnetic field, i.e.: the contact is hermetically

separated from the flowing medium.

VKG

VKG K09/0322 Page 5

6. Mechanical Connection

Before installation:

 The instrument may be mounted in any position. No modifications are neces-

sary. The flow takes place in the direction of the arrow (on the label).

 Remove all transport packing and ascertain that no packing material is left in

the instrument.

 Sealing of the connection threads should be carried out with Teflon tape or

similar.

 During installation of the instrument, it must be checked that no strong forces

will be applied to the connections. We recommend fixing the inlet and outlet pipes

mechanically at approximately 50 mm from each instrument connection.

 The instrument must not be installed within an induction field.

Attention! The threaded connection of the instrument must be

tightened with a suitable size of open ended spanner. Otherwise,

the housing may be stressed which could lead to breakage of

the instrument.

 If possible, check directly after mechanical installation that the connection

thread to pipe is fully sealed (see section commissioning)

Attention! Please note that when installed in open spaces freezing

of the medium can lead to breakage of the glass tube.

 Please ascertain whether the allowable

maximum operating pressure and operating

temperature of the instruments will not be

exceeded (see table: standard material

combinations).

VKG

Page 6 VKG K09/0322

7. Electrical Connection

(Only for Models VKG-2.. and VKG-3..)

 Make sure that the supply wires are de-energized.

 Loosen the holding screw of the plug cap and remove the

cap from the plug.

 Connect the power cable to the plug cap in accordance

with the connection diagram below.

 If the contact has as yet not been adjusted, this should be

carried out at this stage (see section 9 commissioning)

 Connect the plug to the contact connections and secure it

with the holding screw (see section 9 commissioning).

Attention! Electrical values of the reed contacts may not be

exceeded even for short periods. For higher switching values we

recommend contact protection relays.

Following connection of the external equipment to the output and adjustment of the

required switch points, the external power supply to the equipment may be

switched on.

Examples for Contact Protection Measures

For capacitive and inductive loads (long cables and relays/protection) we

recommend protective switching.

VKG

VKG K09/0322 Page 7

8. Use in hazardous area

8.1. Statement an apparatus not containing an own potential

ignition source

VKG

Page 8 VKG K09/0322

VKG

VKG K09/0322 Page 9

8.2. ATEX reed contact 41R57**

ATEX N/O contact 41R57

II 3G Ex ic IIC T4 Gc

II 3 D Ex ic IIIC T125 °C Dc

-20 °C ≤Ta≤80 °C

max. 250 V

AC/DC

/1.5 A/100 W/100 VA

ATEX changeover contact 41R57U

II 3G Ex ic IIC T4 Gc

II 3 D Ex ic IIIC T125 °C Dc

-20 °C ≤Ta≤80 °C

max. 250 V

AC/DC

/1 A/30 W/60 VA

Ex-relevant excerpt of the operating instructions of the reed contact

41R57 **

1. Preambel

This excerpt of the operating instructions only represents the ex-relevant aspects.

It is copied into the original operating manual in the same or analogous form;

Textual changes are permitted, the ex-relevant statements remain.

To ensure the function and for your own safety, please read the enclosed operating

instructions carefully before you begin the installation. If you have any questions,

please contact the KOBOLD Messring GmbH, Hofheim. It applies with the original

operating instructions.

The following standard issues were considered in the evaluation of the product:

a) IEC 60079-0:2017 Ed. 7 / EN 60079-0:2018 Explosive atmospheres –

Part 0: Equipment - General requirements

b) IEC 60079-11:2011 Ed. 6 + Corr. 2012 / EN 60079-11:2012 Explosive

atmospheres - Part 11: Equipment protection by intrinsic safety "i"

2. General information on explosion protection

The reed switches work together with various KOBOLD products and serve there

for monitoring. It is available as N/O contact or changeover contact.

The electrical connection is made via a plug - only in intrinsically safe systems.

The reed switch is intended for commercial use and may only be used in

accordance with the specifications in the technical documentation of Kobold and

the information on the nameplate. It is only operated together with certified products

via an intrinsically safe circuit. They comply with the valid standards and

regulations.

The installation regulations (e.g. EN 60079-14) for systems in potentially explosive

atmospheres must be observed.

Further important details can be found in the corresponding EC-type examination

certificate.

VKG

Page 10 VKG K09/0322

Permitted use

• The intrinsically safe reed switch can be used as follows:

• In Zone 2 (Gas-Ex, EPL Gc) in explosion groups IIA, IIB and IIC

• In Zone 22 (Dust-Ex, EPL Dc) in explosion groups IIIA, IIIB and IIIC

• The requirements for simple electrical equipment for use in intrinsically safe

circuits in zones 1/21 are fulfilled.

• The qualification regarding the surface temperature is T4. For all gases, vapors,

mists with an ignition temperature> 135 ° C the equipment is not an ignition

source.

• In the dust Ex area, 125 ° C is the reference temperature for further

consideration regarding the safety distance from the smoldering temperature.

• The ambient temperature range is -20 ° C ≤ Ta ≤ 80 ° C.

2.1. Electrical characteristics for Ex i

Electrical data:

• Rated voltage up to 45 volt AC / DC

• Rated current up to 2 A

• UiIC ≤ 30 V AC / DC, IiIIC ≤ 250 mA

• UiIIB ≤ 45 V AC / DC, IiIB ≤ 2 A

• UiIIIC ≤ 45 V AC / DC, IiIIIC ≤ 250 mA

• Li = negligible, Ci = negligible

• Heating on the outer housing <15 K

2.2 Type code

The equipment is identified by the following type code:

Type Description Item-No. Remarks

41R57 A B

pe codin

41R57 Contact device

N/O contact

(

2 wires

)

, Plu

with black cap

Change-over contact (3 wires), Plug with grey

cap

B 70

–

75 with markin

(

not ex-relevant

)

202.289 N/O

45 – 50 with marking 202.285 N/O

–

55 with markin

202.286 N/O

–

65 with markin

202.287 N/O

70 – 75 with marking 202.288 Change-over

–

65 chan

e-over contact

202.290 Chan

e-over

2.3 Temperature class

The reed switch is suitable for temperature class T4 / T125 ° C.

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