Kobold VKG Operating Manual

KOBOLD VKG FLOWMETER/SWITCH

User Instructions

Manual-VKG_8-16

Table of Contents

1.0 General . . . . . . . . . . . . . .. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 1

2.0 Specifications . . . . . . . . . . .. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 2

3.0 Principle of Operation . . . .. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 5

4.0 Installation Instructions. . . .. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 5

4.1 Mounting . . . . . . . . . . . . .. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 5

4.2 Adjusting the Set point for Increasing Flow. . . . . . . . . . . . . . . . . . . . 6

4.3 Adjusting the Set point for Decreasing Flow . . . . . . . . . . . . . . . . . . 6

4.4 Contact Protection . . . . . . .. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 7

5.0 Arrival of Damaged Equipment . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 7

6.0 Need help with your VKG? . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 7

VKG

List Of Diagrams

Diagram 2.3 Dimensions . . . . . . .. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 3

Diagram 2.4 Wiring of the Reed Switch . . . . . . .. . . . . . . . . . . . . . . . . . . . . 4

Diagram 2.6 Contact Protection . .. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 7

List of Tables

Table 2.1 Material Composition. . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 2

Table 2.2 Operational Limits . .. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 2

Table 2.5 Electrical Data and Operational Limits. . . . . . . . . . . . . . . . . . 4

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1VKG

KOBOLD VKG FLOWMETER

User Instructions

CAUTION: For safety reasons, please read the cautionary information located at

the end of the manual, before attempting installation.

1.0 __General

The KOBOLD VKG is a viscosity compensated flowmeter intended for use in
applications where changing viscosities of the measured media make flow determination
difficult.

The VKG offers viscosity independent behavior for fluids in the range of 1-540 cSt (full
compensation). Ordinary float-type flow meters experience measurement errors of up to
1000% with this type of a viscosity change in the medium.

At a glance, the special features of the VKG are:

• Viscosity compensated for ∆v = 540 cSt (mm²/s) enabling use of same scale - no

need for recalibration.

• Density compensated for ∆p = 0.5 kg/l, enabling use of same scale - no recalibration

needed.

• Can be installed in any position.

• Can accurately measure flow of a wide range of media without recalibration.

• Compact.

• A large number of flow set points available (3 reed contacts and/or 5 electronic
contacts).

• Hermetic separation between media and indicator/ electronics.

• Suitable for dark and turgid liquids (with side indicator).

• Easy installation.

• Reliable.

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VKG 2

2.0 __ Specifications

Table 2.1; Material Composition

Material: Brass Material: Stainless Steel

Outer Castings

Spring

Orifice

Magnet

Connections

Float

Measuring Tube

O-ri ngs NBR FKM

A lum inum, ano di ze d

301 Stainless Steel

301 Stainless Steel / Brass

Ceramic oxide

Brass

Brass

Borosilica te Glass

Aluminum, anodized

301 Stainless Steel

301 Stainless Steel

Ceramic oxide

304 Stainless Steel

304 Stainless Steel

Borosilicate Glass

Viscosity Range:

Maximum Medium Temperature:

Maximum Internal Pressure:

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Table 2.2; Operational Limits

v = 1 - 540 cSt (mm²/s)

212° F

175 PSIG

3VKG

Diagram 2.3; Dimensions

HEX ( mm) NPT L (in) B (in) D (in) Weight (lb)

VKG-..01
VKG-..02
VKG-..03
VKG-..04
VKG-..05
VKG-..06
VKG-..07
VKG-..08
VKG-..09
VKG-..10
VKG-..11

41
41
41
41
41
41
41
41
41
41
41

1/4
1/4 (1/2)*
1/4 (1/2)*
1/4 (1/2)*
1/4 (1/2)*
1/2 (3/4)*
1/2 (3/4)*
3/4 (1)*
3/4 (1)*
3/4 (1)*
1

5.63

5.63

5.63

5.63

5.63

5.63 (6.02)*

5.63 (6.02)*

6.02

6.02

6.02

6.02

2.09

2.09

2.09

2.09

2.09

2.09

2.09

2.09

2.09

2.09

2.09

1.89

1.89

1.89

1.89

1.89

1.89

1.89

1.89

1.89

1.89

1.89

1.55

1.55 (1.77)**

1.55 (1.77)**

1.55 (1.77)**

1.55 (1.77)**

1.77

1.77

1.77 (2.0)**

1.77 (2.0)**

1.77 (2.0)**

2.0

* Larger fitting size listed in parenthesis is optional.

** Weight in parenthesis is for the VKG series with
optional larger fitting size.

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