Kobold VKA-1 Manuel utilisateur

Operating Instructions

for

Viscosity Compensated

Flowmeter/ Monitor

Model: VKA

VKA

page 2 VKA 01/0722

1. Contents

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

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

3. Regulation Use.........................................................................................................3

4. Operating Principle..................................................................................................4

5. Instrument Inspection..............................................................................................5

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

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

8. Commissioning.........................................................................................................7

9. Technical Information..............................................................................................8

10. Order Codes.............................................................................................................9

11. Maintenance.............................................................................................................9

11.1. Dimensions..................................................................................................10

12.Recommended Spare Parts ................................................................................10

13. Disposal...................................................................................................................11

14.EU Declaration of Conformance..........................................................................12

Manufactured and sold by:

KOBOLD Instruments Inc.

1801 Parkway View Drive

Pittsburgh PA 15205-1422

Tel.: 412-788-2830

Fax: 412-788-4890

E-Mail: [email protected]

Internet: http://koboldusa.com

VKA

VKA01/0722 page 3

2. Note

Please read these operating instructionsbefore unpacking and putting the unit

intooperation.Follow theinstructionspreciselyas described herein.

The instruction manualson ourwebsitewww.koboldusa.comare alwaysfor

currentlymanufactured version of ourproducts. Due to technical changes, the

instruction manuals available online may not alwayscorrespond to theproduct

version you have purchased. If you need an instruction manual that

corresponds to the purchased product version,you can request itfrom us

free of charge by email (info.@koboldusa.com)inPDF format, specifyingthe

relevantinvoicenumberandserial number. If you wish,the operating

instructionscan also be sentto you by post in paper form against an applicable

postage fee.

Thedevices are only to be used, maintained and serviced by persons familiar

withthese operating instructions and inaccordance withlocal regulations

apply-ingto Health&Safety andpreventionofaccidents.

When usedin machines, the measuring unit should be used only when

the machinesfulfiltheEC-machineguidelines.

as per PED 2014/68/EU

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

PED2014/68/EU noCE mark.

Diagram 8, Pipe, Group 1 dangerousfluids

3. Regulation Use

The models VKA-... are usedfor measuring andmonitoringof viscousliquidflows

(30- 540 mm2/s). They are suitablefor measuringclean andhomogeneousfluids

which havenoeffectson theinstrumentmaterials used.

If using higher viscosity media, large deviations will occur to the measured

values.

Large dirt particles may lead to blocking of the float and cause false alarm condi-

tions.

Ferritic particles deposited on the float (with magnet) may lead to the same

effects.

Theinstrumentsare provided as follows:

Flow measurement(onlyfor ModelVKA-2.. andVKA-3..)

The actual flow rate may be read off the magnetically operated pointer indicator

mounted on the instrument. The scale indicates the flow rate directly in litres per

minute.

VKA

page 4 VKA 01/0722

Limit ValueSwitches(onlyfor ModelVKA-1.. andVKA-3..)

The instrument is fitted with one or two adjustable limit value switches for the

monitoringof flow throughputvalues.

Standarddesign: Normally open reed contact (for increasing flow)

Special design: Changeoverreedcontact

The contact is adjustable over the full measuringrange.

StandardMaterialCombinations

Housing

Nickelplated brass

Float

Brass

Spring

Stainless steel 301

Orifice

stainless steel 301

Magnets

Ceramic oxide

Fixing ring

Brass

Reduction (Option)

Nickelplated brass

O-Rings

PTFE (only for opion reduction)

Pointer indication

Plastic

Switchhousing

Plastic

4. Operating Principle

KOBOVAR flow meters /monitors of model VKA have

been developedfor measuring andmonitoringof viscous

flow. They employ a special float principle, with

cylindrical measurement pipe, orifice and spring-loaded

suspended float. This ensures an on-going viscous

compensation within 30 to 540 cSt. All of these units

work independent of position. The recommended

position, however, is vertical, with flowdirection from

belowto upwards.

These units are supplied in following versions:

VKA-1… Flow monitor with 1 contact

VKA-2… Flowmeter with Side-display;

withoutcontact

VKA-3… Flow meter/ monitorwith side-display,

andcontact

VKA

VKA01/0722 page 5

5. Instrument Inspection

Instrumentsare inspected beforeshippingandsentoutin 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.

Scopeof delivery:

The standard deliveryincludes:

•Viscosity CompensatedFlowmeter / Monitor model: VKA

6. Mechanical Connection

Beforeinstallation:

•It shouldbe confirmedthat the maximum allowed

operatingpressures andoperatingtemperatures of the

equipmentare notexceeded

(see technical specifications).

•Theinstrumentsmaybe mountedin every flow

direction.No recalibration is requiredwhen changing

position.The flow must always take place in the

direction of thearrow (see label).

•Remove all transport packing andascertain that no

packing material is left in the instrument.

•Sealing of theconnection threadsshould becarried out

with Teflon tape or similar.

•Theinstrumentsmustnot be installedwithin an

induction field.

•Where possibleafter the mechanical installationit

shouldbe checked that the connection thread to pipe is

fullysealed(see also Commissioning).

VKA

page 6 VKA 01/0722

7. Electrical Connection

(Only for ModelVKA-1.. and VKA-3..)

•Checkthat electrical supply voltageis switched off.

•Loosen the mountingscrewfromtheplugcap and remove the

cap from theplug.

•Connectthepower supplycableto the plugas shown in the

connection diagram.

•If the contact hasnot yet been adjusted, it shouldbedoneso

at this stage (see Commissioningof theInstruments).

•Placethe plugon the contact andfasten it with themounting

screw.

Warning! The given electrical values of the reed contacts must not

be exceeded, not even singly or for short durations. For increased

switch values we recommend a contact protection relay or other

contact protection measures.

After connection of your external equipment at the connection points, and after

adjustment of the chosen switch points, the external power supply to the instru-

ment may be switched on.

Examplesforcontactprotectionmeasures

For capacitive and inductive loads (long cables and relay/protection) we recom-

mendrelay switching.

VKA

VKA01/0722 page 7

8. Commissioning

Adjustmentof the Limit Values (for instrumentswith indicator)

•With a screwdriver, loosen both mountingscrewsat

the contact.

•Move theswitch housingto thelowest position.

•After looseningthescrews, remove the plugcap from

the contact.

•Connectasuitablemultimeter to PIN 1 & 2

(changeovercontactPIN 2 & 3).

•When theinstrumentisalready installed,open the

inletpipe andslowlyallow themedium to flow until

the pointerindicatorshowsthe requiredminimum

flowthroughput.TheReed switch is then closed

(electrical continuity).

•Move theswitch housingupwardsuntil theReed

switch just opens(no electrical continuity).

•At thisposition tighten themountingscrews.Replace

the plugcap. The instrumentisnowready for

operation.

•By correct adjustment of the limit switch,a bi-stable

switch condition isachieved,i.e.: even when

exceeding theadjusted limit value,the contact

remainsclosed

(PIN 1 + 2 or PIN 2 + 3 for changeovercontact option).

Adjustmentof the Limit Value(for InstrumentswithoutIndicator)

•Loosen the mountingscrewson thecontact.

•Position themarkingon thecontact in linewith therequired valueon the

housingscale.

•Tighten the mountingscrewsat thisposition.

Hysteresis

Hysteresis is characterised by the difference between the switching on and

switching off points of the contact. By matching the magnet and reed contact

strength (AW Number) a hysteresis of approx. 3.5 mm of float movement is

achieved. At the same time, it may be assured that the contacts have a bi-stable

switchingcharacteristic.

Exceeding measuringrange

The flow range may be exceeded by a large marginwithanon-pulsating flow.

Only acertainincrease inpressure loss is experienced. (The permissible maxi-

mumoperatingpressure must not be exceeded).

VKA

page 8 VKA 01/0722

Viscosityrange

The instrument scale is suitable for a viscosity range of 30 - 540 mm2/s. Within

thisrange there is noneedfor recalibration.

9. Technical Information

Housing:

Connections:

Float:

Orifice:

Spring:

Magnet:

Sealing:

Max. temperature:

Max. pressure:

Mountingposition:

Contact type:

Elect. Connection:

SwitchingPower:

Accuracy:

Measurementerror w.r.t.

variation in viscosity:

Repeatability:

Viscosity Range:

Brass, Ms 58, (nickel-plated)

Brass, Ms 58

St. Steel 1.4310

Ceramic-oxide

PTFE (only by optional reduction)

Ambient-25…+75°C

Medium-25…+100°C

PN 250

vertical, inflow frombelow

(recommended)

1 N / O contact,

Adjustablefrom 10 – 90% of F.S.

PlugDIN 43 650

Contact: 2-pole

max. 250 VAC / max. 100 VA /

max. 1.5 A

± 4 % of F.S.

(at a viscosity of 105 cSt)

changesin viscositywithin

30…540 cSt causeadditional

deviation.Maximum ± 4% of F.S.

≤1%

30…540 cSt

VKA

VKA01/0722 page 9

11. Maintenance

For clean medias the models VKA-... are almost maintenance-free. However,

where calcium or dirt deposits form in the housing or other internal parts, the

instrumentsshouldberegularlycleaned.

For disassemblingtheunit,pleasefollow thesteps listed below:

1. Use a spannerto dismounttheunitfrom the pipe.

2. If the unitisassembled with a connection reduction,remove theconnection

reduction of the inletsidewith the helpof a spanner.

3. Remove the threadedringwith the helpof a pointedpliers.

4. Take care that themagnets do not fall out of the float, during thesliding of the

float andthe springfrom the housing.

5. Clean all theinnerparts. Thereby take care, that the very sensitiveorificewill

not be damaged.

6. Reassemblethe unitin thecorrect sequenceafter thecleaning.Therebythe

southpolesof themagnets haveto be faced upwards.

10. Order Codes

Order Details (Example: VKA-5102 U)

Range Model Number

GPH Oil GPM Oil Switch

Only

Meter

Only

Meter &

Switch

2...6.3 - VKA-5102 VKA-6102 VKA-7102

6...20 - VKA-5104 VKA-6104 VKA-7104

- 0.3...0.9 VKA-5106 VKA-6106 VKA-7106

- 0.6...1.6 VKA-5108 VKA-6108 VKA-7108

- 1.5...4.2 VKA-5110 VKA-6110 VKA-7110

- 3.0...8.5 VKA-5112 VKA-6112 VKA-7112

- 6...15 VKA-5114 VKA-6114 VKA-7114

- 8...26 VKA-5116 VKA-6116 VKA-7116

Options (Add Suffix to Order Number)

Suffix ..B = ¾" NPT Connection Fittings

Suffix ..C = ½" NPT Conduit Fitting for Electrical Connector

Suffix ..U = SPDT Switch in Place of N/O Switch

VKA

page 10VKA01/0722

12. Recommended Spare Parts

Only the instrument parts and material are listed. Depending on the instrument

type the parts are available in various sizes (when ordering please indicate

instrumenttype).

1.1) Float brass with orifce withoutmagnets

2.1) Set magnets for float

3.1) Spring

4.1) Inlet connection reduction,G 1/2 brass with PTFE O-Ring

4.2) Inlet connection reduction,G 3/4 brass with PTFE O-Ring

4.3) Inlet connection reduction,1/2" NPT brass with PTFE O-Ring

4.4) Inlet connection reduction,3/4" NPT brass with PTFE O-Ring

5.1) Pointerindication

6.1) Contact (Normally Open)

6.2) Contact (Changeoverswitch)

11.1. Dimensions

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