SGB VLX A-Ex Series Manuel utilisateur

Vacuum leak detector

VLX .. A-Ex

with leak indicating unit LAE

Documentation VLX .. A-Ex

SGB GMBH

Hofstr. 10

57076 Siegen

GERMANY

Art. No.: 602 642

Issue: 07/2019

VACUUM LEAK DETECTOR VLX .. A-Ex

- GI-1 - 03/07/2019

Table of contents for documentation

1 Technical description of VLX .. A-Ex 16 pages

2 Drawings for the technical description of VLX .. A-Ex 16 pages

3 Appendix to the technical description of VLX .. A-Ex 5 pages

4 Dimension and drilling illustration 1 page

5 Worksheet: Installation of pneumatic connections 2 pages

6 EU declaration of conformity 1 page

7 Declaration of performance (DoP) and manufacturer’s declaration of

compliance (MDC) 1 page

8 Certifications TÜV Nord 2 pages

9 Warranty 1 page

VACUUM LEAK DETECTOR VLX .. A-Ex

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Table of contents Page

1 Object..................................................................................................................2

2 Field of Application..............................................................................................2

2.1 Requirements for the Interstitial Spaces 2

2.2 Containers up to 0.5 Bar Overlay Pressure 2

2.3 Pipelines/Hoses 3

2.4 Permissible Overlay Pressures/Conveyance Pressures 3

2.5 Stored/Conveyed Product 3

2.6 Resistance/Materials 3

3 Functional Description.........................................................................................4

3.1 Normal Operating Condition 4

3.2 Air Leak 4

3.3 Liquid Leak 4

3.4 Switching Values of the Leak Detector 4

4 Installation Instructions........................................................................................5

4.1 Basic Instructions 5

4.2 Personal Protective Equipment 5

4.3 Assembly of the Leak Detector 5

4.4 Installation of the Pneumatic Connection Lines 6

4.5 Installation of the Electric Connection Lines 8

4.6 Electrical Connection 8

4.7 Additional Notes for Underground Tanks/Pipelines 9

4.8 Installation Examples 9

5 Commissioning....................................................................................................10

6 Operating Instructions..........................................................................................10

6.1 General Notes 10

6.2 Intended Use 11

6.3 Maintenance 11

6.4 Functional Check 12

6.5 Alarms 15

7 Disassembly........................................................................................................15

8 Marking................................................................................................................16

9 Index Used..........................................................................................................16

Drawings:

Position of three-way valves P –096 000

Interior view of magnetic valve version I –000 000

Installation examples (schematic diagrams) for tanks A–01 bis H/I/J–02

Installation examples (schematic diagrams) for pipes L/M–01 bis L/M–03

Testing device P –115 392-a

Testing device (V4A version) P –115 392-b

Wiring diagram (VLX .. A-Ex and LAE) SL –854 400-25

Wiring diagram (VLX .. A-MV-EX) SL –854 500

Wiring diagram (VLX .. A-MV-Ex with floating probe) SL –854 510

Wiring diagram (VLX .. A-MV-Ex with vibrating fork probe) SL –854 520

Appendix:

A VLX .. A-Ex to tanks with leak detector liquid in the interstitial space A-1

E Usage limits for VLX .. A-Ex E-1

TD Technical Data TD-1

LS Expansion of leak detection probe LS-1

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1. Subject

Vacuum leak detectors of Type VLX .. A-Ex in partially explosion-proof models as part of a leak

detection system.

2. Field of Application

2.1. Requirements for the Interstitial Spaces

•Vacuum-resistant with respect to the operating vacuum of the leak detector, even with tem-

perature fluctuations.

•Ensuring the suitability of the interstitial space as part of a leak detection system (e.g. DIN

standards, applicability certificates, suitability of use declarations, etc.).

•No leak-detector liquid in the interstitial space (if there is liquid, see Appendix A).

•Tanks listed under 2.2 must fulfill the above requirements.

2.2. Tanks up to 0.5 bar overlay pressure

Group

Tank design

Installa-

tion

exam-

ple

Suitable

leak detec-

tor type

Usage limits

Single-walled horizontal (underground or over-

ground) cylindrical tanks with leak protection lin-

ing or leak protecting jacket and suction line lead-

ing to the low point

A–01

VLX 34 A-Ex

VLX 330 A-Ex

None for density

and diameter

Same as A, but with no suction line to the low

point

B/C–01

VLX 330 A-Ex

Appendix E, No.

E.1

Double-walled horizontal cylindrical (underground

or overground) tanks

Double-walled (or single-walled with leak protec-

tion lining or leak protecting jacket) vertical cylin-

drical tanks or troughs with a dished bottom (un-

derground or overground) with a suction line

leading to the low point

D–01

VLX 34 A-Ex

VLX 330 A-Ex

Appendix E, No.

E.3

Same as D, but with no suction line to the low

point

E–01

VLX 330 A-Ex

Appendix E, No.

E.1

Rectangular or cylindrical tanks or troughs with a

flat bottom (double-walled or with leak detection

lining or leak detection jacket) with a suction line

to the low point

F–01

VLX 34 A-Ex

VLX 330 A-Ex

Appendix E, No.

E.2

Same as F, but with no suction line to the low

point

G–01

VLX 330 A-Ex

Appendix E, No.

E.1

Standing cylindrical tanks with double-layered

floor made of metal (e.g. according to DIN 4119)

H/I/J–01

H/I/J–02

VLX 330 A-Ex

None regarding

tank height and

stored material

density

Same as H, but with leak protection lining (stiff or

flexible)

Standing cylindrical tanks made of plastic with

double-layered floor

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2.3. Pipelines

/Hoses

Group

Pipeline

Installa-

tion

exam-

ple

Suitable

leak detector

type

Usage limits

Pipes made at the factory or on-site of metal or

plastic with general building site approval or with

acceptance as part of an individual determination

by the responsible authority

L/M–01

L/M-02

L/M-03

VLX 330 A-Ex

Up to 10 bar

conveyor

pressure

Double-walled hoses made at the factory or on-

site of metal or plastic with general building site

approval or with acceptance as part of an indi-

vidual determination by the responsible authority

2.4. Permissible overlay pressures/conveyance pressures

VLX .. A-Ex: Designs as listed under 2.2 and 2.3 with overlay pressures/conveyance pres-

sures up to 10 bar.

VLX .. A-MV-Ex: Designs as listed under 2.2 and 2.3 with overlay pressures/conveyance pres-

sures up to 25 bar

2.5. Stored/Conveyed Product

Water-polluting liquids, the (possible) explosive steam-air mixture (also such ones that can arise

through the stored/conveyed liquids in contact with air, humidity, condensation or the materials

used) of which classes them in gas groups II A to II B3 (II C), as well as temperature codes T1

to T3 (T4) such as gasoline, for example.

If different water-polluting liquids are transported in individual pipes and monitored with a leak

detector, these liquids must not have any hazardous effects on one another or cause any chem-

ical reactions.

2.6. Resistance/Materials

For VLX .. A-Ex leak detectors, material MS 58 or (1.4301, 1.4306, 1.4541)

or 1.4571

, as well

as the material used for the connection lines, must be sufficiently

resistant to the stored materi-

al.

Double-walled fittings can also be integrated in the pipe.

Double-walled fittings can also be monitored for themselves with this leak detector. To do this, refer to the corre-

sponding installation examples for pipes.

See DIN 6601, center section

See DIN 6601, right section

Sufficient means that the physical properties are not adversely affected; discoloration is acceptable.

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3. Function Description

3.1. Normal Operating Condition

The vacuum leak detector is connected to the interstitial space via suction, measuring and con-

nection line(s). The vacuum generated by the pump is measured and controlled by a pressure

switch.

When the operating vacuum is reached (Pump OFF), the pump shuts off. The vacuum slowly

drops due to slight, unavoidable leaks in the leak detector system. When the Pump ON switch-

ing value is reached, the pump turns on and the interstitial space is evacuated until the operat-

ing vacuum is reached (Pump OFF).

Under normal operating conditions, the vacuum swings between the Pump OFF and Pump ON

switching values, with short periods when the pump is run and longer standstills, depending on

the tightness and temperature fluctuations of the entire unit.

3.2. Air leak

If an air leak occurs (in the outer or inner wall, above the liquid level), the vacuum pump switch-

es on to restore the operating vacuum. If the leak causes the incoming air to exceed the pump’s

capacity limit, the pump remains on continuously.

Increasing leak rates lead to a further increase in pressure (with the pump running) until the

Alarm ON switching value is reached. This triggers the visual and acoustic alarms.

In Version VLX .. A-MV (called MV version in the following), the solenoid valve in the suction

line is also closed.

3.3. Liquid Leak

In case of a liquid leak, the liquid enters the interstitial space and collects in the low point of the

interstitial space.

The incoming liquid decreases the vacuum, which causes the pump to turn on and evacuate the

interstitial space(s) until the operating vacuum is reached. The process repeats itself until the

liquid stop valve in the suction line closes.

Because of the vacuum that still exists on the measuring line side, additional leaked liquid is

sucked into the interstitial space, the measuring line and, if applicable, into a pressure compen-

sation vessel. This causes the vacuum to drop until the “Alarm ON” pressure is reached. This

triggers the visual and acoustic alarms.

In the MV version, the solenoid valve in the suction line is also closed.

3.4. Switching values of the Leak Detector

Type

Alarm ON

Pump OFF

Used in Group:

VLX 34 A-Ex

60 25

100 25

A/D/F

VLX 330 A-Ex

370 40

500 40

A/B/C/D/E/F/G/H/I/J/L/M

➢The measured switching value for ”Alarm OFF” must be less than the measured switching value for

”Pump OFF”.

➢The measured value for ”Pump ON” must be greater than the measured value for ”Alarm ON”.

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4. Installation Instructions

4.1. Basic Instructions

(1) Observe the approvals of the manufacturer for the tank/pipeline and the interstitial space.

(2) Only qualified service companies may be used for assembly and commissioning

(3) Comply with relevant regulations regarding electric installation

(e.g. EN 60 079-14), explo-

sion protection

(e.g. EN 60 079-17), and accident prevention.

(4) Comply with explosion regulations, e.g. BetrSichV (and/or directive 1999/92/EC and the

laws of the respective member states resulting therefrom) and/or others.

(5) Pneumatic connections, connection lines and fittings must be designed to at least PN 10

and/or PN25 for the entire temperature range.

(6) Before entering inspection chambers, the oxygen content must be tested and the inspec-

tion chamber flushed if necessary.

(7) Lead-throughs for pneumatic and electric connection lines, through which the EX atmos-

phere can carry over, must be sealed gas-tight.

(8) If metallic connection lines are used, it must be ensured that the power supply grounding is

on the same potential as the pipeline/tank to be monitored.

4.2. Personal Protective Equipment

The parts listed here refer in particular to safety when working with systems that may be subject

to risk of explosion.

If work is performed in areas in which an explosive atmosphere must be expected, the minimum

required equipment is as follows:

•Suitable clothing (risk of electrostatic charge).

•Suitable tools (e.g., per EN 1127).

•Suitable combustible gas indicator calibrated to the existing vapor-air mixture (work should

be performed only at a concentration of 50 % below the lower explosion limit)

•Measuring equipment to determine the oxygen content in the air (Ex/O-meter).

4.3. Assembly of the Leak Detector

(1) The leak detector VLX consists of an leak indicating unit (LAE) and the leak detector

VLX .. A-Ex and/or a monitoring device ME-MV(-LS) with the leak detector VLX .. A-MV-Ex

(2) In accordance with EN 13160, the monitoring device fits the term ”leak indicating unit” and

the tool is a ”leak detector”

(3) All housings are designed for installation on a wall.

For Germany: Specialist service companies per Water Law, which have documented qualifications to install leak

detection systems, including proof of work in the Ex-area.

For Europe: Authorization by the manufacturer.

For Germany: e.g. VDE regulations, EN, regulations of the electricity providers.

For Germany: e.g. ElexV, GSiG, BetrSichV

Other countries’ regulations may give different percentages.

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4.3.1 Tool installation

(4) Outside and inside the Ex-area (zone 1), in the open air, without any more protective box-

es.

Select the place of installation so that the ventilation in the housing (by way of convection)

between the offset flange plate and slots is not impaired.

Should it nevertheless be necessary to install a protective box, it has to be ventilated so

that the above-stated ventilation is not impaired.

(5) If it is assembled in an enclosed space, it must be well ventilated. The operator shall apply

EN 60 079-10/EN 13 237 as a basis for evaluation.

(6) Not in manhole pits or inspection chambers.

4.3.2 Installation of the monitoring device (LAE)

(4) See documentation 605 602 “Leak Indicating Unit (LAE)”

4.3.3 Installation of the monitoring device ME-MV(-LS)

(4) NOT in potentially explosive areas.

(5) Inside a closed, dry area.

Alternatively: Installation in suitable protective boxes, use an additional external signal or

assignment of the potential free contacts to alarm transmission.

(6) Do not install directly next to a strong heat source.

(7) At least 1 m away from the tool.

(8) NOT in potentially explosive areas.

(9) Inside a closed, dry area.

Alternatively: Installation in suitable protective boxes, use an additional external signal or

assignment of the potential free contacts to alarm transmission.

(10) Do not install directly next to a strong heat source.

(11) At least 1 m away from the tool.

4.4. Installation of the Pneumatic connection lines

(1) Fixed, metallic pipes (e.g. Cu pipe) or sufficiently pressure-resistant plastic pipes in ac-

cordance with section 4.1. (across the entire temperature range), the latter only if the inter-

stitial space is NOT Zone 0.

When using plastic pipes, the underground pipes and overground pipes have to be protec-

tive pipes whose inlets and outlets must be sealed against gas and liquid.

(2) Inside clearance min. 6 mm.

(3) Resistant to the stored product.

(4) Color coding: Measuring line: RED; suction line: WHITE or CLEAR; exhaust: GREEN.

(5) The full cross section must be maintained.

(6) The lines between the interstitial space and leak detector must not exceed 50 m in length.

If the distance is greater than this, a larger cross section must be used. There are special

requirements for the exhaust line, see section 4.4.1.

(7) Condensate traps must be installed at all low points of the connection lines.

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(8) Install a liquid stop valve in the suction line.

(9) If liquids are being stored or transported that require compliance with explosion protection,

suitable detonation flame arresters must be installed at the entry to the interstitial space.

(10) Detonation flame arresters

–must be used on the leak detector side if either the suction line or exhaust line (or both)

is/are connected to Zone 0.

–Not necessary if both suction and exhaust line are NOT connected to Zone 0.

(11) For applications with pressure compensation vessel (see drawing L/M-01 to L/M-03):

Length of the measuring line from the pressure compensation vessel (V=0.1 l)

Type 330: Lmax 8 m 

For every 10 ml of the condensate trap(s) used in the measuring line between the pressure

compensation vessel and leak detector, Lmax is reduced by 0.4 m OR (alternatively to the

pressure compensation vessel): 50% of the overall length of the measuring line must be

laid horizontally, or with a 0.5 to 1 % gradient to the node point. Lmin = 0.5 x total length of

the measuring line (compare with L/M-01 top drawing).

(12) When using the V4A version, as a rule, shut-off cocks should be provided on the interstitial

space side.

4.4.1 Exhaust line installation

(1) The following lengths may not be exceeded for the exhaust line:

Pipe with 6 mm inside clearance: 35 m (F 501 + F 502)

If these lengths are not sufficient, the manufacturer must be consulted.

(2) The exhaust line is generally routed to the tank ventilation, in which case a detonation

flame arrester must be installed on the tank vent side.

Exceptions:

Tanks with interior overlay pressure, tanks according to DIN 4119 with double-layered floor,

or comparable:

A) The exhaust line can lead outside to a safe

area, outside of the explosion area:

Provide a condensate trap and liquid stop valve in the exhaust. The area within 1 m di-

ameter of the end of the exhaust is considered as having Zone 1 conditions; attach a

warning sign if necessary.

B) The exhaust ends in zone 1 (e.g. remote fill chamber or collection space):

A detonation flame arrester

must be provided at the end of the exhaust line. Conden-

sate traps must be provided at low points; a liquid stop valve is not required if the end of

the exhaust is in an area which is made liquid-tight according to water protection laws

(e.g. collecting area).

(3) Caution: An exhaust line which ends outdoors must not in any circumstances be used to

detect leaks (e.g. by ”sniffing”). Attach warning signs if necessary.

If this volume is multiplied, Lmax is multiplied in the same way.

Among other things, not acceptable for public contact / persons

The detonation flame arrester can be omitted, if the exhaust is laid frost-free and a kink (e.g. shifting of a protective

tube) or a block in the exhausted can be precluded.

VACUUM LEAK DETECTOR VLX .. A-Ex

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4.4.2 Connecting several pipeline interstitial spaces parallel to a leak detector via a

distributor (see L/M 02)

(1) Lay connection lines at a downward angle to the interstitial space or the manifold. If there

are low points in the connection lines and lines are laid out of doors as well, install conden-

sate traps at all low points.

(2) Lay suction and measuring lines at a downward angle to the manifold. If this is not possi-

ble, place condensate traps at all low points.

(3) Connect a liquid stop valve to each connection line to the interstitial space, against the

valve direction.

This prevents leaking liquids from entering the interstitial spaces of the other pipelines.

(4) If shut-off cocks are installed in the connection lines then they must be sealable in open

position.

4.5. Installation of Electric Connection Lines (Leak Detectors –Monitoring Device)

(1) Requirements for the Line:

- Insulated, with screen depending on local conditions

- Color of the jacket: Gray (also other colors, but no blue)

- Outside diameter: 13 to 18 mm

- Number of leads: 5 (4 + PE) (Leads must be distinguishable)

- Cross section of VLX .. A-Ex: 1.5 mm2to 200 m lead length

- Cross section of VLX .. A-MV-EX: 1.5 mm2to 100 m lead length,

max. lead capacity: 120 nF/km

(2) If the cable is laid in a line, then only together with measurement, controller, or regulation

technology cables, not together with cables carrying load.

(3) Fixed wiring, no plug or switch connections

4.6. Electrical connection

(1) Power supply: 230 V –50 Hz

(2) Observe GROUNDING.

(3) Fixed wiring, i.e. no plug or switch connections

(4) Terminal layout for LAE:

See also documentation 605 600 “Indicating unit”

51–54 Connection between LAE and VLX .. A-Ex

(4) Terminal layout for ME-MV(-LS)

2 Outer conductor (phase)

3 Zero conductor

4/5 External signal (230 V in case of alarm, can be turned off by

activating the "mute" button)

21/22/24 voltage-free contacts (two-way)

51–54 Connection line between ME-MV(-LS) and VLX.. A-MV-Ex

11/12 connection of a leak detection probe, if present (remove bridge for this)

Ce manuel convient aux modèles suivants

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