Kobold LFM Manuale utente

Operating Instruction

for

Micro Flow Meter

Model: LFM

LFM

Page 2 LFM K03/0422

1. Contents

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

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

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

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

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

6.Mechanical connection .................................................................................. 5

7.Electrical connection ..................................................................................... 5

8.Operation ...................................................................................................... 5

9.Technical Information .................................................................................... 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

LFM

LFM K03/0422 Page 3

2. Note

Please read these operating instructions before unpacking and putting the unit

into operation and 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 with the prevailing regulation applying to

procedural safety and the prevention of accidents.

When used in machines, the measuring unit should be used only then when the

machines fulfil the EC-machine guide lines.

PED 2014/68/EU

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

PED 2014/68/EU no CE mark.

Table 8, Pipe, Group 1 dangerous fluids

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:

 Micro flow meter: model LFM

 Connector plug

LFM

Page 4 LFM K03/0422

4. Regulation Use

The LFM is a new flowmeter designed for use on clean low-viscosity liquids and

is particularly suitable for dosing and filling applications. Extremely low flow rates

can be measured down to 0.005 l/min. Care should be taken that liquid which

may attack the wetted parts of the flowmeter are not used.

Please ensure that all steps in this manual are observed as the flowmeters war-

ranty does not cover damage resulting from failure to comply with these

instructions.

We recommend a filter with 40 µm mesh size.

5. Operating Principle

The measuring mechanism is based on a dual-ring piston pendulum. The right-

hand measuring chamber is opened, and the left-hand chamber closed, by the

pendulum arm that is inclined to the right. The pressure of the forced liquid acts

on the upper surface of the piston pendulum. The right-hand ring piston is

pressed clockwise downwards, and the left-hand ring piston is pressed clockwise

upwards by the larger surface (opened measuring chamber) on the right. Thus

the right-hand measuring

chamber is closed, and

the left-hand chamber

opened. The surface on

the left is now greater –

causing motion in the

opposite direction. This

cycle is repeated with

continuous flow at a rate

proportional to the flow

rate 1–230 cycles/s. A volume of approximately 0.01 cm3 is displaced per pass.

The built-in carrier frequency transducer senses the oscillating motion of the

piston pendulum and pendulum arm without contact through the case, and

outputs a digital signal with a frequency proportional to the volumetric flow. Due

to the negligible pendulum mass and minimum friction loss, the LFM detects

minimum volumetric flow rates. Leakage loss is minimized by the piston design,

which also provides good linearity and repeatability.

Inlet bore

Outlet bore

Meas. Chamber 1

Pendulum

Ring piston

Meas. Chamber 2

LFM

LFM K03/0422 Page 5

6. Mechanical connection

 Please ensure that the permitted values of maximum pressure and

temperature are not exceeded.

 The recommended filter size is 40µm.

 The flowmeter should be installed vertically with flow from bottom to top.

 Fibrous seals should be avoided as pieces can cause damage to the unit if

they enter the flowmeter. Connection should only be made using a correct fit-

ting and appropriate seal.

 We recommend that you pressure test the unit for leaks after installation.

7. Electrical connection

 When wiring the plug or making electrical connections to the flowmeter please

ensure that the power supply is isolated.

 Electrical connections should be made according to the diagram.

Attention! Incorrect wiring may cause damage to the electronics.

Check!

Plug-Connector

5-pin plug M12 SPEEDCON

1 = +UB

2 = n.c./NAMUR- (“N”, “U”)

3 = 0 V (not “N”)

4 = Signal Push-Pull (not “N”)

5 = n.c.

8. Operation

Please pay attention to the technical data printed on the type-label as well as

given in the data sheets.

The system must be evacuated from air otherwise the accuracy

will be affected.

LFM

Page 6 LFM K03/0422

9. Technical Information

Measurin

ran

e: 0.005....0.25 l/min

Linearity: 2.5 % of reading

Repeatabilit

: ± 0.1 %

Viscosit

e: 0.6...6 mm²/s

K facto

: approx. 75000 pulses/L

Material:

Sensor housing:

Pendular:

Seal:

stainless steel 1.4435

stainless steel 1.4122

PTFE, FKM, FFKM

Connection: G 1/8 female thread (output)

6 mm Swagelock (input),

NPT thread on request

Filte

: 40 µm; filter with 2x6 mm Swa

elok

Max. pressure: 100 ba

Max. Δp:

Max. temperature:

300 mbar at 5 cSt/0.25 L/min

-40 °C...+80 °C

Electrical data:

Electrical connection:

Push-pull

Umax= 30 V

5-pin M12

Installation position: vertical, flow rate from bottom to top

Weight

(

with transducer

)

approx. 650

Protection: IP 65

LFM

LFM K03/0422 Page 7

10. Dimensions

LFM

Page 8 LFM K03/0422

11. EU Declaration of Conformance

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

responsibility that the product:

Micro Flow Meter Model: LFM

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

EN 61000-6-2:2005 Electromagnetic compatibility (EMC) - Part 6-2:

Generic standards - Immunity for industrial environments

EN 61000-6-4:2007+A1 Electromagnetic compatibility (EMC) - Part 6-4:

Generic standards - Emission standard for industrial environments

EN 61010-1:2015 Safety requirements for electrical equipment for

measurement, control, and laboratory use - Part 1: General requirements

Also, the following EC guidelines are fulfilled:

2014/30/EU EMC Directive

2011/65/EU RoHS (category 9)

2015/863/EU Delegated Directive (RoHS III)

Hofheim, 11 Sept. 2019

H. Peters M. Wenzel

General Manager Proxy Holder

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