KROHNE VA40 Wiring diagram

Variable area flowmeter

Equipment category II 2 G with electrical components

Ex supplementary instructions

Ex supplementary instructionsEx supplementary instructions

Ex supplementary instructions

VA40

VA40VA40

VA40 Supplementary instructions

Supplementary instructionsSupplementary instructions

Supplementary instructions

AD_VA40_II2G_R01_en_4002262401_PRT.book Page 1 Monday, October 15, 2012 2:46 PM

CONTENTS

2 www.krohne.com 10/´2012 - 4002262401 MA VA40-Ex-II2G-AD R01 en

VA40

1 Safety instructions 3

1.1 General notes ................................................................................................................... 3

1.2 EC conformity ................................................................................................................... 3

1.3 Security information......................................................................................................... 3

2 Device description 4

2.1 Device description ............................................................................................................ 4

2.2 Description code............................................................................................................... 4

2.3 Marking............................................................................................................................. 5

2.4 Flammable products ........................................................................................................ 7

2.5 Equipment category .........................................................................................................7

2.6 Protection types................................................................................................................ 7

2.7 Ambient temperature / temperature classes.................................................................. 8

2.8 Electrical data................................................................................................................... 9

3 Installation 10

3.1 Installation...................................................................................................................... 10

4 Electrical connections 11

4.1 General notes ................................................................................................................. 11

4.2 Grounding and equipotential bonding............................................................................ 11

5 Operation 12

5.1 Start-up........................................................................................................................... 12

5.2 Operation ........................................................................................................................ 12

5.3 Electrostatic charge .......................................................................................................12

6 Service 13

6.1 Maintenance ................................................................................................................... 13

6.2 Dismantling .................................................................................................................... 13

AD_VA40_II2G_R01_en_4002262401_PRT.book Page 2 Monday, October 15, 2012 2:46 PM

SAFETY INSTRUCTIONS 1

VA40

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Safety instructions

1.1 General notes

These additional instructions apply to explosion-protected versions of the VA40/./../..-Ex variable

area flowmeter with the designation II 2 G. They complement the Installation and Operating

Instructions for the non-explosion protected versions.

The information given in these Instructions contains only the data relevant to Category 2

explosion protection. The technical details given in the Installation and Operation Instructions for

the non-explosion protected versions apply unchanged unless excluded or superseded by these

Instructions.

1.2 EC conformity

The manufacturer declares with the EC Declaration of Conformity on his own responsibility

conformity with the protection goals of Directive 94/9/EC for use in hazardous areas with gas.

The EC Type Test Certificate of the Physikalisch Technische Bundesanstalt (PTB) forms the basis

of the EC Declaration of Conformity:

The "X" after the certificate number refers to special conditions for safe use of the device, which

have been listed in these Instructions.

The EC type test certificate may be downloaded from the manufacturer's website as needed.

1.3 Security information

Assembly, installation, start-up and maintenance may only be performed by personnel trained in

explosion protection!

PTB 05 ATEX 2026 X

PTB 05 ATEX 2026 XPTB 05 ATEX 2026 X

PTB 05 ATEX 2026 X

CAUTION!

The operator respectively his agent is responsible to follow further standards, directives or laws

if required due to operating conditions or place of installation. This applies particularly for the

use of easy detachable process connections such as SMS or Clamp when measuring flammable

mediums.

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2DEVICE DESCRIPTION

VA40

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Device description

2.1 Device description

Variable area flowmeters measure and display the volume flow of flammable and non-

flammable gases and liquids. Up to two separately adjustable electrical limit switches can be

mounted to the on-site display.

2.2 Description code

The safety description code * consists of the following elements:

* positions which are not needed are omitted (no blank positions)

1 Type of connection

V - Screw connection

S - Tube socket

F - Flange connection

A - Aseptic connection, conforming to food standards

2 Material of the connection

R - Stainless steel 1.4404 (316 L)

ST - Steel, electroplated and chromized

PV - Platics PVDF

3 Limit switches

K1 - one limit switch

K2 - two limit switches

Safety description code MS14:

1 Inserting limit switch

2 Version 21

Safety description code MS14:

1 Magnetic switch

2 Reed cartridge 14

without Limit switch with connected cable

A - Limit switch with terminal box (standard)

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DEVICE DESCRIPTION 2

VA40

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2.3 Marking

The marking of the complete device is shown in the following nameplate. The variable-area

flowmeter is marked on the roundly housing.

1 Type of meter

2 Manufacturer

3 Website

4 Appointed ATEX body

5 Pay regard to manual

6 Ex-data

7 Serial number

8 Year of manufacture

9 PED-data

10 Design data: Temperature & pressure rating

Marking Limit switch TG21

1 Type

2 Manufacturer

3 Ex data

4 KROHNE website

5 Built-in components

6 Observe Operation and Installation manual

AD_VA40_II2G_R01_en_4002262401_PRT.book Page 5 Monday, October 15, 2012 2:46 PM

2DEVICE DESCRIPTION

VA40

www.krohne.com 10/´2012 - 4002262401 MA VA40-Ex-II2G-AD R01 en

Marking Limit switches MS14

1 Type

2 Manufacturer

3 Year made

4 PTB number

5 KROHNE website

6 Electrical connection data

7 Ex data

Marking Limit switches MS14A

1 Type

2 Manufacturer

3 PTB number

4 Year made

5 Electrical connection data

6 Ex data

7 KROHNE website

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DEVICE DESCRIPTION 2

VA40

www.krohne.com10/´2012 - 4002262401 MA VA40-Ex-II2G-AD R01 en

2.4 Flammable products

Atmospheric conditions

An explosive atmosphere is a mixture of air and flammable gases, vapours, mists or dusts under

atmospheric conditions. The following values define it

Tatm = -20°C...+60°C / -4°F...140°F and Patm = 0.8...1.1bar.

Outside of this range, no key data are available as to ignition behaviour for most mixtures.

Operating conditions

Variable area flowmeters operate outside of atmospheric conditions, which means that

explosion protection according to Directive 94/9/EC (ATEX) –regardless of the zone assignment

–is fundamentally not applicable due to the lack of key safety data for the interior of the

measuring section.

2.5 Equipment category

The flowmeters are designed in category II 2G according to EN 60079-0 and EN 60079-11 for use

in zone 1.

2.6 Protection types

The circuits of the limit switches and of the electronic signal output are designed in Type of

protection "Intrinsic

Safety", Category ”ia“and ”ib“respectively.

CAUTION!

Operation with flammable products is only permissible if no explosive fuel/air mixture is formed

on the interior of the flowmeter under operating conditions. The user is responsible for the safe

operation of the flowmeter with regard to the temperatures and pressures of the products used.

In case of operation with flammable products the measuring units must be included in the

periodic pressure tests of the system.

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2DEVICE DESCRIPTION

VA40

www.krohne.com 10/´2012 - 4002262401 MA VA40-Ex-II2G-AD R01 en

2.7 Ambient temperature / temperature classes

Because of the influence of the temperature of the product, no fixed temperature class is

assigned to variable area flowmeters. In fact, the temperature class of a device is a function of

the temperature of both the product and the environment. There is no distinction between

devices with one or two contacts. The classification is outlined in the following tables.

The tables take into account the following parameters:

•Ambient temperature Tamb.

•Product temperature Tm

Maximum permissible product and ambient temperatures TG21

Maximum permissible product and ambient temperatures MS14/.

The maximum medium and ambient temperature is -20°C...+85°C / -4°F...+185°F.

These values may be limited by the information contained in the installation and operating

instructions. The maximum values listed in the installation and operating instructions must be

taken into consideration.

INFORMATION!

The maximum permissible product temperatures listed in the tables are valid under

the following conditions:

•

The measuring device is installed and operated in accordance with the installation

instructions in the manual.

•

It must be ensured that the flowmeter is not heated by the effects of additional heat radiation

(sunshine, neighbouring system components) and thus operated above the permissible

ambient temperature range.

•

Insulation must be limited to the piping.

Unobstructed ventilation of the indicator part must be ensured.

Supply Type 1 Type 2 Type 3

Temperature class T6 T5 T4...T1 T6 T5 T4...T1 T6 T5 T4...T1

Max. medium

temperature [°C] 70 85 95 60 75 95 35 50 70

Max. medium

temperature [°F] 158 185 203 140 167 203 95 122 158

AD_VA40_II2G_R01_en_4002262401_PRT.book Page 8 Monday, October 15, 2012 2:46 PM

DEVICE DESCRIPTION 2

VA40

www.krohne.com10/´2012 - 4002262401 MA VA40-Ex-II2G-AD R01 en

2.8 Electrical data

Limit switch TG21

The built-in intrinsically safe NAMUR limit switch TG21 may only be connected to isolation

switching amplifiers with separated intrinsically safe circuits to EN 60947 -5 -6 with the

following max. values:

Maximum values of the power supply units

When connecting to intrinsically safe circuits, take into consideration the following maximum

values per circuit for the energy stores.

Limit switch MS14

Built-in limit switch MS14 may only be connected to separate intrinsically safe circuits with the

following maximum values:

When connecting to intrinsically safe circuits, take into consideration the following maximum

values per circuit for the energy stores.

Supply Pi[mW] Ui[V] Ii[mA]

Type 1 34 16 25

Type 2 64 16 25

Type 3 169 16 52

Ci[nF] Li[µH]

165 150

Pi[W] Ui[V] Ii[mA]

130 100

Ci[nF] Li[µH]

0 0

AD_VA40_II2G_R01_en_4002262401_PRT.book Page 9 Monday, October 15, 2012 2:46 PM

3INSTALLATION

VA40

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Installation

3.1 Installation

Installation and setup must be carried out according to the applicable installation installation

standards (e.g. EN 60079-14) by qualified personnel trained in explosion protection. The

information given in the Installation and Operation Instructions and the Supplementary

Installation and Operation Instructions must always be observed.

Variable area flowmeters must be installed in such a way that

•There is no danger from mechanical impact effects.

•There are no external forces affecting the indicator part.

•The device is accessible for any visual inspections that are necessary, and can be viewed from

all sides.

•The nameplate is clearly visible.

•It can be operated from a location with secure footing.

CAUTION!

The manufacturer is not liable for any damage resulting from improper use or use other than the

intended purpose. This applies in particular to hazards due to insufficient corrosion resistance

and suitability of the materials in contact with product.

AD_VA40_II2G_R01_en_4002262401_PRT.book Page 10 Monday, October 15, 2012 2:46 PM

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