SGB VLX A-Ex Series User manual

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
24/07/2019
- 1 -
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

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 2 -
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
A
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
B
Same as A, but with no suction line to the low
point
B/C–01
VLX 330 A-Ex
Appendix E, No.
E.1
C
Double-walled horizontal cylindrical (underground
or overground) tanks
D
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
E
Same as D, but with no suction line to the low
point
E–01
VLX 330 A-Ex
Appendix E, No.
E.1
F
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
G
Same as F, but with no suction line to the low
point
G–01
VLX 330 A-Ex
Appendix E, No.
E.1
H
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
I
Same as H, but with leak protection lining (stiff or
flexible)
J
Standing cylindrical tanks made of plastic with
double-layered floor

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 3 -
2.3. Pipelines
1
/Hoses
Group
Pipeline
Installa-
tion
exam-
ple
Suitable
leak detector
type
Usage limits
L
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
M
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)
2
or 1.4571
3
, as well
as the material used for the connection lines, must be sufficiently
4
resistant to the stored materi-
al.
1
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.
2
See DIN 6601, center section
3
See DIN 6601, right section
4
Sufficient means that the physical properties are not adversely affected; discoloration is acceptable.

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 4 -
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”.

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 5 -
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
5
.
(3) Comply with relevant regulations regarding electric installation
6
(e.g. EN 60 079-14), explo-
sion protection
7
(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)
8
.
•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.
5
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.
6
For Germany: e.g. VDE regulations, EN, regulations of the electricity providers.
7
For Germany: e.g. ElexV, GSiG, BetrSichV
8
Other countries’ regulations may give different percentages.

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 6 -
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.

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 7 -
(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)
9
:
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
10
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
11
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.
9
If this volume is multiplied, Lmax is multiplied in the same way.
10
Among other things, not acceptable for public contact / persons
11
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
24/07/2019
- 8 -
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)

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 9 -
(5) Voltage may be only applied when:
–all electric and pneumatic lines are connected properly.
–the housing lid for the Ex terminal box in the tool is closed.
4.6.1 Grounding and potential compensation
(1) The housing of the leak detector must be connected to the equipotential bonding of the
overall system by means of the ground stud provided for that purpose.
(2) The fittings in the connection lines must likewise be integrated into the equipotential bond-
ing, especially when plastic pipes (connection lines to tanks) have been used.
(3) Before replacing a leak detector (tool), disconnection lines or similar work, it must be en-
sured that the equipotential bonding remains intact (if necessary, pull electrically conduct-
ing bridges).
4.7. Additional Notes for Underground Tanks/Pipelines
If a tank / pipeline is installed in a KKS system (cathode corrosion protection) that requires volt-
age isolation, then electrical isolators need to be installed in the pneumatic lines. These isola-
tors must be provided with overload protection (spark plug gaps) and the isolators need to be
protected against accidental bridging.
4.8. Installation Examples
Installation examples are given in the Appendix.
Observe the following information at all times:
The 82 pipe unions (connection assembly pump) are listed in the installation examples only as
examples. These pipe unions can be installed anywhere. These pipe unions are not needed,
when, for example, the test valve is used to connect the vacuum generator.
1. Installation example L/M –02:
–The laying system can also be combined with L –01
2. Installation example L/M –03:
TOP: If there is a liquid leak in the (suction line side) first pipeline, the interstitial space
for the second (and following) pipeline(s) can also become filled with liquid.
The length of the measuring line must not exceed 3.5 m; if it does, use of a pressure
compensation vessel as per section 4.4.
CENTER and BOTTOM:
The liquid stop valves installed against the direction of flow (27*) prevent that the
other interstitial spaces become filled with liquid in case of a leak in a pipeline.
The volumes of the connected pipes must meet the following criteria:
3 •VMS 1 > VMS 1 + VMS 2 + VMS 3 + VMS 4 and
3 •VMS 2 > VMS 2 + VMS 3 + VMS 4, etc.
VMS (number) is the volume of the specific interstitial space. No. 1 is the interstitial
space where the suction lines are connected (see also L/M-03, center and bottom).

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 10 -
5. Commissioning
(1) Connect the pneumatic lines.
(2) Complete the electrical wiring, but do not yet connect to the power supply.
(3) Close the lids on the Ex terminal box and the housing.
(4) Apply voltage supply.
(5) Determine illumination of the operating and alarm lights, as well as the acoustic alarm and
turn the ”mute” button to OFF.
(6) a) Set three-way valve 21 to position ”III” and connect the test measuring gauge.
(See P-096 000)
b) V4A Version: Connect the shut-off cock on the measuring side in position 2 and connect
the test measuring gauge. (See P-098 000)
CAUTION: Only equipment which meets Category 1 on the inside (for interstitial spaces in
Zone 0) and Category 2 (for interstitial spaces in Zone 1) may be connected to the test
cocks.
(7) Apply a vacuum to the system. (When necessary, use explosion-proof installation pump.
CAUTION: Be aware of temperature code and EX group!).
Connect installation pump to pipe union 82, switch it on and open the appropriate shut-off
cock. The interstitial space will then be evacuated. Monitor the vacuum build-up on the
measuring instrument.
NOTE: If no pressure build-up is achieved with the installation pump connected, the leak
must be located and corrected (check the performance of the installation pump as well, if
necessary).
(8) After the operating vacuum of the leak detector has been achieved (pump in the leak de-
tector switches off
12
), close the opened shut-off cock, switch off the pump and remove it.
(9) a) Put the three-way valve 21 in position I, remove the pressure measurement instrument.
b) V4A Version: Put the shut-off cock on the measuring side in position 1 and remove the
pressure measuring instrument.
(10) Perform the functional check as per section 6.4.
6. Operating Instructions
6.1. General Notes
(1) If the leak detection system is installed properly and tightly, it can be assumed that the leak
detector works within the control range.
(2) Frequent switching on or continuous running of the pump indicates leaks, which should be
corrected within a reasonable time.
(3) If the alarm goes off, this always indicates a more significant leak or a defect. Determine
the cause and correct it quickly.
(4) The operator must check the function of the operating lights at regular intervals.
(5) For any repair work, disconnect the power to the leak detector. Test EX atmosphere, if
necessary.
12
In the solenoid valve version, the pump stands still in the event of an alarm. When the switching value for alarm
OFF is exceeded, the pump is switched on and stops again when it reaches the pump OFF switching value.

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 11 -
(6) CAUTION: For single-walled tanks with a flexible leak protection lining the interstitial space
can never be without pressure (collapse of the leak protection lining)!
(7) A loss of power is indicated by the "Operation" signal lamp going off. A loss of power to the
voltage-free relay contacts (if used for alarm transmission) triggers the alarm.
After the power loss, the green signal lamp lights up again and the voltage-free contacts no
longer generate an alarm (unless the power loss has caused the pressure to drop below
the alarm pressure
13
.)
(8) To clean the leak detector, use a damp cloth.
6.2. Intended Use
•Double-walled tanks and pipelines/hoses
•Tank-/pipeline-/hose-side detonation flame arrester
•Leak detector side detonation flame arresters may be used under the following conditions
•Grounding as per EN 1127
•The leak detection system must be leak-proof according to the table in the documentation
•Leak detector installed outdoors, i.e. outside or inside (max. Zone 1) the Ex-area (inside the
building possible if the listed requirements are met)
•Explosive vapor-air mixtures: IIA to II B3, T1 to T3(T4)
•Lead-throughs inside and outside of the manhole or inspection chamber must be sealed
gas-tight
•The power supply cannot be disconnected
6.3. Maintenance
(1) Maintenance work and functional check must be performed by trained personnel
14
only.
(2) Once a year
15
to ensure functional and operational safety.
(3) 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
(4) Test scope according to section 6.4.
(5) Compliance with the conditions per sections 4 to 6.3 must also be tested.
(6) Disconnect the power to the leak detector before opening the housing.
(7) The conditions in section 4.6.1 must be observed and complied with at all times.
(8) As part of the annual functional check, check the motor of the pump for running noises
(damaged bearings).
(9) The pump has to be changed after 30000 h (working hours (rotation) of the pump).
(10) Should the pump or its exhaust pipe be swapped or detached, then a tightness test of the
installed pump should be carried out with a pressure of 10 bar after the exchange in order
to ensure the impermeability of the exhaust in the housing.
–Additionally, for the VL-H9 version with solenoid valve:
- CAUTION: solenoid valve could be hot!
- If the solenoid valve has to be exchanged, you must ensure that the system has been
drained of pressure and fluid.
13
In the MV version, this also means that the commissioning switch must be switched again to recommission.
14
For Germany: specialist or under the supervision of a specialist.
For Europe: Authorization by the manufacturer.
15
For Germany, national regulations must also be observed (e.g. AwSV)

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 12 -
- Never pull the magnet off the body under tension.
- No repairs on-site (send in completely)
- NOTE: cable is firmly potted; can not be solved at the valve
6.4. Functional Check
The functional and operational safety tests must be performed
•after each commissioning,
•according to section 6.3,
•each time a malfunction has been corrected.
The explosion-protection measures must be considered in all functional checks.
Only equipment which meets Category 1 on the inside (for interstitial spaces in
Zone 0) and Category 2 (for interstitial spaces in Zone 1) may be connected to the
test cocks.
6.4.1 Test Scope
(1) Coordinate the work to be performed with those responsible for operation, if necessary.
(2) Observe the safety instructions for working with the stored material.
(3) Checking and if necessary, emptying the condensate traps (6.4.2).
(4) Check the free passage of air in the interstitial space (section 6.4.3).
(5) Testing the switching values with the interstitial space (section 6.4.4)
Alternatively: Testing the switching values with the testing device (section 6.4.5).
(6) Test the vacuum pump delivery (section 6.4.6).
(7) Perform the tightness test on the leak detection system (section 6.4.7).
(8) Create the operating conditions (section 6.4.8).
(9) A qualified person must complete a test report, confirming functional and operational safe-
ty.
6.4.2 Checking and emptying the condensate traps, if required
(1) Close any shut-off cocks on the interstitial space side.
(2) Set three-way valves 20 and 21 to position IV to ventilate the connection lines.
(P-096 000)
(3) Open and empty the condensate traps.
CAUTION: The condensate traps may contain the stored/conveyed product. Take appropri-
ate protective measures.
(4) Close the condensate traps.
(5) a) Set three-way valves 20 and 21 to position I. (P-096 000)
b) MV version: Additionally activate “Commissioning” switch if the leak detector
alarm is active.
(6) Open the shut-off cocks on the interstitial space side.
6.4.3 Checking the free passage of air in the interstitial space
(1) Connect the measuring instrument to three-way valve 21, then set to position III.
(P-096 000)

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 13 -
(2) For tanks and pipes per installation example L/M -3:
Set three-way valve 20 to position IV. (P-096 000)For pipelines as per installation exam-
ple L/M-1 and L/M-2: Open the test valve at the end opposite the leak detector; in case of
multiple pipe interstitial spaces, the test valves must be opened sequentially at the end op-
posite the leak detector.
(3) Check if the measuring instrument registers a vacuum drop. If no pressure drop occurs,
locate and correct the cause.
(4) Close three-way valve 20 in position I, or suction line side shut-off cock (V4A Version) of
test valve(s) respectively.
(5) Set three-way valve 21 to position I. (P-096 000)
(6) Remove the measuring instrument.
6.4.4 Testing the switching values with the Interstitial Space
(1) Connect the measuring instrument to three-way valve 21, position III. (P-096 000)
(2) For tanks and pipes per installation example L/M -3:
Ventilate with three-way valve 20 (position III) (P-096 000)For pipelines as per installa-
tion example L/M-1 and L/M-2: Open the test valve at the end of the interstitial space oppo-
site the leak detector. In case of multiple pipes, the leak detector-side shut-off cocks of the
interstitial spaces not included in the test can be closed.
(3) Check switching values ”Pump ON” and ”Alarm ON” (with visual and audible, if available).
Record the values.
(4) Activate the “mute” button.
(5) Set three-way valve 20 to position I and close suction line side shut-off cock (V4A Version)
or test valve (in MV version, switch “Commissioning” switch) and check switching values
"Alarm OFF” and "Pump OFF”. Record the values.
(6) The unit passes the test if the measured switching values fall within the specified tolerance.
(7) Open any shut-off cocks that were closed prior to the test.
(8) Set three-way valve 21 to position I. (P-096 000)
(9) Remove the test measuring instrument.
6.4.5 Testing the switching values with the test equipment
(1) Connect the testing device to the two hose ends on each of the free pipe unions of three-
way valves 20 and 21. (P-096 000 and P-115 392-a)
(2) Connect the measuring instrument to the tee of the testing device.
(3) Close the needle valve of the testing device.
(4) a) Set three-way valves 20 and 21 to position II. The operating vacuum is built up in the
test vessel. (P-096 000 and P-115 392-a)
b) MV version: Turn switch “Commissioning”, (build-up of operating vacuum).
(5) Ventilate using the needle valve, check switching values ”Pump ON” and ”Alarm ON” (visu-
al and acoustic, if necessary). Record the values.
(6) Activate the “mute” button, if necessary.
(7) Slowly close the needle valve and check switching values “Alarm OFF” and “Pump OFF”.
(MV version, turn ”Commissioning” switch)

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 14 -
(8) The unit passes the test if the measured switching values fall within the specified tolerance.
(9) Set three-way valves 20 and 21 to position I. (P-096 000)
(10) Remove the testing device.
6.4.6 Testing the Vacuum Pump Delivery Pressure
(1) Connect the measuring instrument to three-way valve 20 and set to position II. (P-096 000)
(2) a) Set three-way valve 21 to position II to ventilate the pressure switch. The alarm is trig-
gered and the pump runs. (P-096 000)
b) MV version: Turn switch “Commissioning”, the pump runs.
(3) Read the delivery rate of the pump from the measuring instrument.
(4) The test has been passed when the pressure value reached > 150 mbar (type 34) and/or
> 550 mbar (Type 330).
(5) a) Set three-way valves 20 and 21 to position I. (P-096 000)
b) MV Version: Turn switch ”Commissioning” back.
(6) Remove the measuring instrument.
6.4.7 Leak detection system tightness test
(1) Check that all shut-off cocks between the leak detector and interstitial space are open.
(2) Connect the measuring instrument to three-way valve 21, position III. (P-096 000)
(3) The vacuum pump must have reached the Pump OFF switching value for the tightness test.
Wait for a possible pressure compensation and then start the tightness test.
(4) The test is positive if the values of the following table are met. A higher pressure drop
means a higher load on the wear parts.
Interstitial space volume in liters
1 mbar pressure drop in
100
9 minutes
250
22 minutes
500
45 minutes
1000
1.50 hours
1500
2.25 hours
2000
3.00 hours
2500
3.75 hours
3000
4.50 hours
3500
5.25 hours
4000
6.00 hours
(5) Test cock in position I
(6) Remove the measuring instrument.
6.4.8 Creating the operating condition
(1) Set the „mute“button to sealing screw position and seal.
For central monitoring dev ice: Press “sound off” button, if necessary – the red LED must
not be illuminated.
(2) Seal the housing.

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 15 -
(3) Seal the shut-off cocks (between the leak detector and interstitial space) for each connected
interstitial space in the open position.
(4) Ensure that the test cocks are set to standard operation.
6.5. Alarms
(1) If an alarm goes off, one must assume that there is an explosive vapor-air mixture in the
interstitial space. Take appropriate protective measures.
(2) An alarm is indicated by the “Alarm” signal lighting up and the sounding of the acoustic sig-
nal, if available.
(3) Close any shut-off cocks in the connection line between the interstitial space and leak de-
tector.
(4) Shut off the acoustic signal by activating the “mute” button.
(5) Inform the installation company.
(6) The installation company must detect the cause and correct it.
CAUTION: Depending on the tank, there could be liquid under pressure in the connection
lines.
CAUTION: Do not allow the interstitial space in the tanks with flexible leak protection lining
to become pressure less (collapse of the insert).
(7) Repairs to the leak detector (e.g. replacement of components) may only be made outside
the ex-area, or if suitable safety measures have been met.
(8) Perform the functional check per section 6.4, observing the conditions from sections 4 to 6.3.
7. Disassembly
For disassembly, the following points must be observed in particular:
•Make sure the unit is free of gas before and during removal (see also section 4 above).
•Seal any openings gas-tight through which an explosion atmosphere can carry over.
•Avoid using spark-producing tools (saws, parting grinders, etc.) for disassembly whenever
possible. Should this be unavoidable, however, comply with EN 1127 or the area must be
free of explosive atmosphere.
•Avoid the buildup of electrostatic charges (e.g., through friction).
•Properly dispose of contaminated components (possibly through outgassing).
8. Marking
•Type
•Electrical Data
•Manufacturer or manufacturer's mark
•Year (month/year)
•Serial number
•Symbol specified by law
•EX data

VACUUM LEAK DETECTOR VLX .. A-Ex
24/07/2019
- 16 -
9. Index Used
01 Signal lamp "Alarm", red
02 Shut-off cock
03 Exhaust line
09 Signal lamp "Operation", green (white)
11 Vacuum switch
18 Detonation flame arrester
20 Three-way valve in suction line
21 Three-way valve in the measuring line
22 Venting device
24.1 Fuse 1 A MT (H)
24.2 Fuse 2.5 A MT (H)
24.3 Fuse 0.1 A T (H)
27 Liquid stop valve
27* Liquid stop valve, connected opposite the valve direction
30 Housing
33 Condensate trap
34 Terminal box
36 “Commissioning” switch
41 Alarm switch in 11
42 Pump switch in 11
43 Measuring line
44 Solenoid valve
45 Signal light “Feed”, yellow (= pump running)
48 “Network” signal light, green
52 Measuring gauge
57 Test valve
59 Relay
60 Vacuum pump
68 Suction line
69 Buzzer
71 “Mute” button
73 Interstitial space
74 Connection line
82 Connection assembly pump
84 Test vessel 1 liter
85 Test pipe union (measuring gauge)
86 Indicating unit
87 Leak detector
88 Double-walled pipe
95 Pressure compensation vessel
96 Node point
98 Sealing plug
101 Suction line leading to the low point

II
IIII
IIIIII
IVIV
21
21
21
21
20
20
20
20
15-01-2002 /01-2004
P - 096 000

Ex
73
73
101
101
60 30
21
20
43
43
03 68
68
18
27
02
82
11
87
34
31.08.2018
A - 01
230 V / 50 Hz
86
69
48
23
01
71
Ex
Ex /