SGB VL Series Operator's manual

Vacuum leak detector
VL ..
Documentation VL
SGB GMBH
Hofstraße 10
57076 Siegen
GERMANY
Art. No.: 605 302
Issue: 07/2019

Design variants
VACUUM LEAK DETECTOR VL ..
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Overview of the design variants
The vacuum leak detectors of the VL-serie are available in different designs which are
described in detail by the suffix characters.
VL .. E FA P M LE S Si
“Service indication“: integrated service in-
dicator (LED) with an adjustable service
period
”S/Service display“: integrated service indica-
tor (LED) with a fixed 12-month interval
”LOD Ethernet“: Remote monitoring “Leak Detec-
tion-Online-Diagnostics”with Ethernet-module
”Manometer“: The leak detector is equipped with a
digital pressure display in the housing cover.
”Protected“: Construction of the leak detector in a
weatherproof housing.
”Füllstandsanzeige/filling level indication“: The leak detec-
tor is equipped with an electronic filling level indicator
„Enlarged functions“: With this design there is the option to
connect and control additional equipment like magnetic valves
and/or sensors.
„..“ = “Numerical value” for the alarm-vacuum of the leak detector.
The alarm pressures range from 34mbar to 570 mbar.
“Vacuum leak detector“: The leak detector operates with negative
pressure towards the atmosphere.

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Contents of the documentation
1 Technical description 17 pages
2 Drawings to the technical description 15 pages
3 Appendix to the technical description 9 pages
3.1 Appendix A: Use of the vacuum leak detector VL ..
on interstitial spaces filled with leak detection liquid 1 page
3.2 Appendix E: Height (diameter) and density 2 pages
3.3 Appendix TD: Technical Data 1 page
3.4 Appendix DP: Evaluating the display for the function "Tightness test" 1 page
3.5 Using the leak detector on tanks which have been allowed to warm up 4 pages
3.6 VL .. FA7: Programming the level indicator 2 pages
4 Dimension and Drilling, Plastic-housing 1 page
5 Dimension and Drilling, Steel-housing, weather protected 1 page
6 Working sheet „pneumatic connections“ 2 pages
7 EU Declaration of Conformity 1 page
8 Declaration of performance (DoP) and
manufacturer’s declaration of compliance 1 page
9 Certification TÜV Nord 1 page
10 Warranty 1 page

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Table of contents Page
1 Object..................................................................................................................2
2 Field of application...............................................................................................2
2.1 Interstitial space requirements 2
2.2 Material to be stored 2
2.3 Resistance/materials 2
2.4 Tanks with up to 0.5 bar superimposed pressure 3
2.5 Tanks with pressures up to 5 bar (in liquid leak case) 4
2.6 Tanks with up to 10 bar superimposed pressure 4
3 Functional description..........................................................................................4
3.1 Normal operation 4
3.2 Air leak 4
3.3 Liquid leak 5
3.4 Switching values of the leak detector 5
3.5 Description of the display and operating elements 6
4 Mounting instructions...........................................................................................7
4.1 General notes 7
4.2 Mounting the leak detector 7
4.3 Mounting the (pneumatic) connection lines 8
4.4 Mounting the probe (VL .. E only) 9
4.5 Mounting the solenoid valve(s) (VL .. E only) 9
4.6 Selection of the (electrical) supply line (VL .. E only) 10
4.7 Electrical connection 10
4.8 Installation examples 11
5 Start-up................................................................................................................11
6 Operating instructions..........................................................................................12
6.1 General instructions 12
6.2 Intended use 12
6.3 Maintenance 12
6.4 Functional test 13
6.5 Alarm 16
7 Marking ...............................................................................................................16
8 Index used...........................................................................................................16
Drawings:
Position of three-way valves P–060 000
Installation examples (basic sketches) for tanks A–01 to O–01
Block diagram VL .. SL–853 600
Block diagram VL .. E SL–854 800
Testing equipment P–115 392
Appendices:
A Use of the leak detector VL .. on tanks with interstitial spaces filled
with leak detection liquid A-1
E Usage limits VL .. E-1
TD Technical data TD-1
DP Evaluating the display for the function “Tightness test” DP-1
W Using the VL .. leak detector on tanks which have been W-1
allowed to warm up
FA Programming the filling level indicator FA7 FA-1

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1. Object
Vacuum leak detector of the type VL .. (dots stand for alarm vacuum) as part of a leak detection
system in the following versions:
a) VL ..
b) VL .. E (Extended version, i.e. either a leak probe or solenoid valve or both can
be connected in addition)
Leak probe: Either in place of the liquid stop valve if special installation conditions or
resistance matters make it necessary or as a probe used separately (e.g.
in the leakage containment).
Solenoid valves: Must be used whenever tanks are operated at more than 5 bar overlay
pressure or if resistance requirements make them necessary (system is
then executed resistant up to the solenoid valves).
2. Area of application
2.1. Interstitial space requirements
•Vacuum resistance to the operating vacuum of the leak detector, also taking fluctuations in
temperature into account.
•Assurance of the suitability of the interstitial space as part of a leak detection system (e.g.
DIN standards, proofs of usability issued by the building inspection authorities, determina-
tion of suitability etc.)
•No leak detection liquid in the interstitial space (see app. A if this is nevertheless the case)
•The tanks listed under sections 2.4 to 2.6 meet the above requirements acc. to App. E.
•The volume of the space monitored by the leak detector may not exceed 8 m3for tanks. The
manufacturer recommends not to exceed 4 m3.
2.2. Material to be stored
Liquids hazardous to water with a flash point > 60°C (for Germany > 55°C acc. to TRGS 509
and 751), where no potentially explosive vapor-air mixtures occur.
2.3. Resistance/materials
For the leak detector VL .. the material polyamide (PA) in connection with brass (MS-58) or
(1.4301, 1.4306, 1.4541)
1
or 1.4571
2
as well as the material of the connecting tubes used has to
be sufficiently resistant to the material to be stored/conveyed.
If the materials mentioned above are not sufficiently resistant, correspondingly resistant sole-
noid valves can be used in the tanks.
1
cf. DIN 6601, centre column
2
cf. DIN 6601, right-hand column

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2.4. Tanks with up to 0.5 bar superimposed pressure
Group
Tank design
Installa-
tion ex-
ample
Suitable
leak de-
tector
type
Use limits
A
Single-wall, horizontal (below / above ground),
cylindrical tanks or spherical tanks with leak de-
tection lining or jacketing and suction line leading
to the low point
A –01
VL 34
to
VL 570
None with respect
to density and
diameter
B
As A, but without suction line to the low point
B –01
VL 230
to
VL 570
Appendix E,
No. E.1
C
Double-walled, horizontal, cylindrical (below /
above ground) tanks or spherical tanks
D
Double-walled (also single-wall with leak detec-
tion lining or jacketing), vertical, cylindrical tanks
or troughs with a dished bottom (below / above
ground) with suction line to the low point
D –01
VL 34
to
VL 570
Appendix E,
No. E.3
E
As D, but without suction line to the low point
E –01
VL 230
to
VL 570
Appendix E,
No. E.1
F
Rectangular or cylindrical tanks or troughs with
flat bottom (completely double-walled or with leak
detection lining or jacketing) with suction line to
the low point
A –01
VL 34
to
VL 570
Appendix E,
No. E.2
G
As F, but without suction line to the low point
B –01
VL 230
to
VL 570
Appendix E,
No. E.1
H
Battery tanks in series, with suction line to the
low point
H –01
VL 30-70
Manufacturer-
related
Appendix E, No.
E.4
I
Battery tanks parallel, without suction line to the
low point, individually monitored battery tanks as
G
I –01
VL 320-
420
Installation instruc-
tions acc. to I-01
J
Double-walled surface seals
J –01
VL 230
to
VL 570
Appendix E,
No. E.1
K
Double-walled shafts of hydraulic cylinders (e.g.
in lifts)
K –01
VL 34
to
VL 570
Appendix E,
No. E.2

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2.5. Tanks with pressures up to 5 bar (in liquid leak case)
Group
Type of tank
Installa-
tion ex-
ample
Suitable
leak de-
tector
type
Use limits
L
Vertical cylindrical tanks with double bottom (leak
detection lining), leak detector connected at the bot-
tom (e.g. GFK tanks or tanks according to DIN
4119)
L –01
VL 255
Tank height:
25 m
M
As L, but suction and measuring pipe as joint pipe
leading from the tank (with node point)
M –01
N
As L, but with several (parallel) pipes leading from
the tank. Interstitial space divided into segments.
2.6. Tanks with superimposed pressures up to 10 bar
Group
Type of tank
Installation ex-
ample
Suitable leak
detector type
Use limits
O
Versions as under 2.4, in as far as overlay
pressures up to 10 bar are permissible in
the respective tank.
As 2.4, but with
solenoid valve(s):
O –01
VL 34 E
to
VL 570 E
See 2.4
3. Functional description
3.1. Normal operation
The vacuum leak detector is connected to the interstitial space via the suction and measuring
line, possibly also via the connection line(s). The vacuum generated by the pump is measured
and controlled by a pressure sensor.
When the operating vacuum (pump OFF) has been reached, the pump is switched off. Due to
slight, unavoidable leaks in the leak detection system, the vacuum begins to fall slowly. When
the switching value for “pump ON” has been reached, the pump is switched on and the intersti-
tial space evacuated until the operating vacuum (pump OFF) has been reached again.
During normal operation the vacuum moves between the switching value pump OFF and the
switching value pump ON, with the pump running for a short time and then switching off for a
longer time, depending on the tightness and temperature fluctuations in the complete system.
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 in order to re-establish the operating pressure. If the air flow leaking into the pipe exceeds
the limited feed flow of the pump, the pump remains on continuously.

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Increasing leak rates lead to a further increase in pressure until the switching value for alarm
ON has been reached. An optical and audible alarm signal is triggered. If solenoid valves are
closed, the pump stops.
3.3. Liquid leak
In the case of a liquid leak, liquid enters the interstitial space and collects at the lowest point of
the interstitial space.
The incoming liquid leads to the vacuum dropping, the pump is switched on and evacuates the
interstitial space(s) until operating pressure has been reached. This process is repeated until
the liquid stop valve in the suction line closes.
Due to the vacuum still present in the measuring line, further leak liquid is sucked into the inter-
stitial space, the measuring pipe and into a pressure compensating vessel if appropriate. This
leads to reduction of the vacuum until the pressure has reached the “alarm ON” level. The opti-
cal and audible alarm signal is triggered. If solenoid valves are connected, they close and the
pump stops.
If in place of the liquid stop valve a leak probe is mounted in the suction line in connection with
solenoid valves, the alarm signal is triggered when leak liquid reaches the leak probe. This
closes the solenoid valves and the pump stops.
3.4. Switching values of the leak detector in mbar
NOTE: The leak detector with the lowest alarm pressure for the respective application should be
used whenever possible (lower component wear)
Type
alarm ON
Pump OFF
Use on Group:
VL 34, VL 34 E
> 34
< 90
A/D/F/K/O
VL 30-70
> 30
< 70
H
VL 230
> 230
< 360
A to G and J/K/O
VL 255, VL 255 E
> 255
< 380
L/M/N also poss.: A to G and J/K/O
VL 320-420
> 320
< 420
I
VL 330, VL 330 E
> 330
< 450
A to G and J/K/O
VL 410, VL 410 E
> 410
< 540
A to G and J/K/O
VL 500, VL 500 E
> 500
< 630
A to G and J/K/O
VL 570, VL 570 E
> 570
< 700
A to G and J/K/O
VL .. - .. (E)
Special switching values agreed between SGB and customer
The measured switching value for "alarm OFF" has to be at least 5 mbar smaller than the
measured switching value for "pump OFF".
The measured switching value for "pump ON" has to be at least 15 mbar bigger than the meas-
ured switching value for "alarm ON".

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3.5. Description of the display and operating elements
3.5.1 States of the display elements (signal lamps)
Signal lamp
Operating state
Start-up
Start-up, alarm acknowledges
Alarm, vacuum below the "alarm ON" level
Alarm, as left- hand column, acknowledged
Alarm probe
Alarm probe, acknowledged
Alarm solenoid valve
Alarm solenoid valve, acknowl- edged
Device malfunc- tion
OPERA-
TION: green
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ALARM:
red
OFF
BLINK
ING
BLINK
ING
ON
BLINK
ING
OFF
OFF
ON
BLINK
ING
ON3
ALARM 24:
red
OFF
BLINK
ING
BLINK
ING
OFF
OFF
ON
BLINK
ING
ON
ON
OFF
Description:
Start-up: If the alarm is acknowledged as the pump is being put into operation, an optical dis-
tinction is not made, the audible signal is on or off depending on the button position. When the
switching value "alarm OFF" has been exceeded, the audible signal is always off.
Alarm p<pAE: Alarm signal when the vacuum in the monitored system is below the switching val-
ue "alarm ON".
NOTE: If an alarm probe should occur following this alarm signal, the alarm probe has priority!
(i.e. the alarm probe is displayed. Once the cause for this has been eliminated, the Alarm p<pAE
will be displayed again.) The audible alarm signal is not given, but the other LED blinks accord-
ing to the table.
Alarm probe: See Alarm p<pAE
Alarm solenoid valve: Is triggered when the solenoid valve has an electrical defect.
Device malfunction: Is displayed if a fault should occur on the PCB.
3.5.2 Operating functions via buttons
•Switch off audible alarm signal:
Press the "mute" button briefly once, the audible signal is switched off, the red LED blinks.
If the button is pressed again, the audible signal is switched back on.
This function is not available during normal operation and in the event of a malfunction.
•Testing the optical and audible alarm signal
Press the "mute" button and keep it pressed (approx. 10 seconds), the alarm signal is trig-
gered until the button is released again. This scan is only possible if the pressure in the sys-
tem has exceeded the "alarm OFF" pressure.
•Checking the tightness of the system monitored
Press the "mute" button and keep it pressed until the signal lamp "alarm" blinks quickly after
approx. 5 seconds, then release the button. The "alarm" signal lamp displays a value for
tightness on the basis of the number of blinks (see chapter 6.4.5)
3
The "mute" button is without function
4
Only applies to VL .. E

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10 seconds after this value has been displayed the signal lamp returns to normal operation.
The leak detector must have carried out at least 1 automatic post-feed interval in normal op-
eration (i.e. without external assembly pump) to achieve a valid statement.
•Zero-point adjustment
Three-way valve 21 in position II.
Press the "mute" button and keep it pressed until the "alarm" signal lamp blinks quickly after
approx. 5 seconds, then release the button. Press the button again immediately and then re-
lease it again. Adjustment is confirmed by 3 optical and audible signals.
Before repeating zero-point adjustment the "pump OFF" switching value must be reached.
VL .. /E ONLY
•Start-up (opening the solenoid valves)
Press the "start-up" button and keep it pressed for approx. 5 seconds until both red signal
lamps light up. The solenoid valves are opened, the pump starts to run. If this button is kept
pressed longer than 10 seconds, the alarm signal is generated. Shortly after the button is re-
leased the alarm signal triggered is deleted again.
For information about activating or deactivating the solenoid valves, refer also to chapter
4.5.1
4. Mounting instructions
4.1. General notes
(1) Heed manufacturers' approval for the tanks and the interstitial space.
(2) Installation and start-up must be carried out by a qualified company
5
.
(3) Heed relevant regulations concerning electrical installation
6
.
(4) Heed and observe accident prevention regulations.
(5) Pneumatic connections, connection lines and fittings must be able to withstand the pres-
sure (static pressure plus superimposed pressure) which could occur in the case of a leak,
for the whole temperature range possible.
(6) Before anyone enters a dome or control shaft, the oxygen content must be checked and
the shaft flushed out if necessary.
4.2. Mounting the leak detector
(1) Wall mounting, within a building
(2) Wall mounting in the open, using a suitable protective box.
If the detector is to be mounted in a protective box, at least one of the following points must
be observed:
- Signal lamps for operation must be visible from the outside (protective box with trans-
parent lid or signal lamps mounted on the outside)
- Use of potential-free contacts to extend alarm - if these contacts are not used, additional
external signal
5
For Germany: Specialist firms according to the Federal Water Act, which have verified their qualification
for the installation of leak detection systems. For Europe: Authorisation from the manufacturer.
6
For Germany: e.g. VDE regulations, regulations issued by utilities companies.

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(3) OUTSIDE potentially explosive areas.
(4) As near to the tank as possible (cf. section (6) of the following chapter).
4.3. Mounting the (pneumatic) connecting lines
(1) Plastic hoses (e.g. PVC) or tubes made of plastic or metal.
Pressure resistance, see requirements specified in chapter 4.1.
(2) Clearance at least 6 mm.
(3) Resistant to the product to be stored.
(4) Color marking: Measuring line: RED; Suction line: WHITE or TRANSPARENT, Exhaust
line: GREEN.
(5) The full cross-section must be retained.
(6) The length of the lines between the interstitial space and the leak detector should not ex-
ceed 50 m. If the distance is bigger, a larger pipe cross-section must be used.
(7) Routing lines with lowest points: mounting of condensate traps at each lowest point (heed
pressure resistance specified in 4.1).
(8) Mount the liquid stop valve in the suction line (heed pressure resistance specified in 4.1).
(9) Exhaust line must lead with slope to the tank ventilation outlet. In the case of laying with
lowest points, use condensate traps.
Alternatively: The exhaust line can terminate out in the open, at a non-dangerous spot. In
this case, provide for a condensate trap and liquid stop valve in the exhaust line
7
.
(10) Conduits for connecting lines have to be sealed gas- and liquid tight at the inlet and outlet
points.
(11) For applications using a pressure compensating vessel in the measuring line, if suction and
measuring line are connected together in a node point, the following shall apply:
Per 0.1 liter volume
8
of the pressure compensating vessel, the length of the measuring line
(Lmax) may only be a maximum of
VL 230 and VL 255 17 m (6 mm clearance) 39 m (4 mm clearance)
VL 320-420 21 m 47 m
VL(R) 330 16 m 36 m
VL(R) 410 12 m 28 m
VL(R) 500 10 m 22 m
VL(R) 570 8 m 18 m
NOTE: The lower edge of the pressure compensating vessel must not be lower than the
node point, the upper edge of the pressure compensating vessel must not be more than 30
cm above the node point.
Per 10 ml of the condensate trap(s) mounted in the measuring line between pressure com-
pensating vessel and leak detector, Lmax is reduced by:
0.5 m (6 mm clearance)
1 m (4 mm clearance).
ALTERNATIVELY: In place of the pressure compensating vessel, the measuring line can
be laid from the node point over 50% of the measuring line length (=Lmin) with approx. 1%
slope to the node point.
7
Condensate trap and liquid stop valve are not required if the exhaust pipe ends above a liquid-proof
area (e.g. filling area, leak containment room).
8
Multiplying this volume leads to a multiplication of Lmax. Dividing this volume leads to a division of Lmax.

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4.4. Mounting the probe (VL .. E ONLY)
4.4.1 Probe requirements
(1) Approval as overload protection or as leak probe is required.
(2) Voltage supply identical to voltage supply of the leak detector.
(3) Current consumption of the probe P < 200 W
(4) Dry relay contacts which open in the case of alarm.
(5) Other versions can be agreed with the manufactures, since adaptation could be necessary.
4.4.2 Probe in place of the liquid stop valve
(1) A probe can be integrated in the suction line as a component part of the installation kit in
place of a liquid stop valve (agree version of installation kit (MBS) with the manufacturer).
The probe can also be mounted as an additional fixture at the low point of the interstitial
space.
(2) With this version the leak detector indicates that liquid (product or groundwater) is in the
suction line (and thus usually in the interstitial space).
(3) This version can become necessary if
–the alarm signal is not possible due to the pneumatic principle
–the liquid to be monitored is extremely dangerous (e.g. potentially fatal).
–if escaping liquid (e.g. due to "just" sufficient resistance of the interstitial space) has to be
established immediately.
4.4.3 Probe in addition to the leak detector for monitoring increase in liquid level
(1) Set up or mount the probe in the space to be monitored (dome or control shaft, leak tub,
leakage containment) according to the manufacturer's instructions.
(2) Install the electrical supply line to the leak detector and connect it according to the instruc-
tions in chapter 4.7.
4.5. Mounting the solenoid valve(s) (VL .. E ONLY)
(1) The solenoid valves must be mounted as near to the interstitial space as possible. Pres-
sure resistance, resistance to substances (incl. sealing materials), temperature range and
protective rating (in the case of mounting in the open air) must be guaranteed.
(2) For VL .. E: Connect two solenoid valves (one each in the suction and measuring line) to
the leak detector according to the instructions in chapter 4.7:
- Voltage supply: per solenoid valve 115 V (with 230 V supply) respectively
per solenoid valve 12 VDC (with 24 VDC supply)
- Current consumption: 5 to 10 W

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4.5.1 Activation or deactivation of the solenoid valve monitoring
(1) If solenoid valves (or one solenoid valve) are used, solenoid valve mon-
itoring must be ACTIVATED: The coding plug must be inserted accord-
ing to the photo. The photo shows an active solenoid valve monitoring
case.
NOTE: If solenoid valve monitoring is not activated, the valve will not
open, the start-up button will not work!
4.6. Selection of the electrical supply line (VL .. E ONLY)
4.6.1 Probe
(1) Cable length should not be longer than 30 meters
9
(2) Recommended cable type: NYM 5 x 1.5 mm2, LiYY 5 x 0.75 mm2with wire-end sleeves
4.6.2 Solenoid valve(s)
(1) Cable length should not be longer than 30 meters
10
(2) Recommended cable type: NYM 3 x 1.5 mm2, LiYY 3 x 0.75 mm2with wire-end sleeves
4.7. Electrical connection
(1) Voltage supply: see type plate.
(2) Firmly laid, i.e. no plug or switch connectors.
(3) Terminal assignment (see also SL-853 600 (VL ..) and SL-854 800 (VL .. E):
1 230 V respectively “+” with 24 VDC voltage supply
2 230 V respectively “-“ with 24 VDC voltage supply
3/4 Occupied (leak detector pump)
5/6 External signal (voltage supply in case of alarm, is switched off using "mute" button.
7/8 VL .. E ONLY connection of the solenoid valve(s)
11/12 Dry relay contacts, open in case of alarm and power failure
21/22 VL .. E ONLY connection of the dry relay probe contacts (contacts have to be
open in case of alarm and power failure)
11
NOTE: When the device is delivered a bridge is used which must be removed when
the probe is connected
X/X Serial data transmission (no. 106 in the circuit diagrams)
4.8. Installation examples
Installation examples are given in the appendix.
The following notes must always be heeded:
Note: The connection of interstitial spaces is only permitted for battery tank plants and
pipework UNDER the following conditions.
9
The length is limited for EMC-related reasons, longer lengths only after consultation and agreement with
the manufacturer.
10
The length is limited for EMC-related reasons, longer lengths only after consultation and agreement
with the manufacturer.
11
9/10 ONLY for probes requiring a voltage supply. E.g. not for floating switches.

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1. For tanks with suction line to the low point:
The suction line must lead either in the interstitial space or on the outside of the tank (but
then pressure-resistant) from the low point of the interstitial space to above the interstitial
space and also above the max. tank filling level.
2. Installation example A –01:
Here, the probe is drawn with a dotted line for the version VL .. E in order to show the differ-
ent possibilities.
3. Installation example H –01:
This series connection is ONLY permitted and possible for the tank type(s) listed in
Appendix E.4.
4. Installation example K –01:
The exhaust pipe ends in a non-dangerous position.
The following possibilities are available for monitoring these shafts:
–Double-walled pipe around the hydraulic cylinder, suction line in the interstitial space lead-
ing to the low point.
–Interstitial space between the single-wall pipe and hydraulic cylinder, with the suction line
leading to the low point of the interstitial space.
–Suction and measuring line connected to the highest point of the interstitial space. In addi-
tion, probe at the low point of the interstitial space. This means the shaft can be as deep as
required.
5. Start-up
(1) Heed and observe specifications in chapter 4.
(2) Carry out pneumatic connection.
(3) Set up electrical connection, do not apply voltage supply yet.
(4) Close the housing cover.
(5) Apply voltage supply.
(6) Establish lighting up of operating and alarm lamp as well as the audible alarm signal. Press
the "mute" button, the signal lamp "alarm" will blink.
(7) Only VL .. E with solenoid valve: carry out the start-up sequence (see chapter 3.5.2).
(8) Three-way valve 21 in position "III", connect measuring gauge. (cf. P-060 000)
(9) Apply vacuum to the system.
To do this, the installation pump can be connected to the muff on three-way valve 20, posi-
tion IV. Switch on the installation pump. The interstitial space will be evacuated. Monitor the
vacuum build-up on the measuring gauge.
NOTE: If no pressure is built up with the installation pump connected, the leak must be lo-
cated and eliminated (if necessary, check the feed capacity of the pump and/or the position
of the three-way valve).
(10) Once the leak detector has reached operating vacuum (pump in the leak detector switches
off), the three-way valve must be set to position I, the installation pump switched off and
removed.
(11) Three-way valve 21 in position "I", remove the measuring gauge.
(12) Carry out the functional test according to section 6.4.

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6. Operating instructions
6.1. General instructions
(1) If the leak detection system is installed tightly and correctly then it can be assumed that the
leak detector is working in the range of control.
(2) Frequent switching on, or continuous running of the pump indicates leaks which must be
eliminated within a reasonable period of time.
(3) In the case of an alarm there is always either a major leak or a fault. The cause must be
established quickly and the problem eliminated.
(4) The leak detector must be disconnected from the mains for any repair work.
(5) Current interruptions are indicated by the "operation" signal lamp going out. The alarm sig-
nal is triggered via the dry relay contacts (if used to extend the alarm).
Following the current interruption, the green signal lamp lights up again, the alarm signal is
switched off via the potential-free contacts (unless the pressure has fallen below the alarm
pressure during power failure). Carry out the start-up sequence for leak detectors with con-
nected solenoid valve(s).
6.2. Intended use
•Double-walled tanks according to chapter 2, under the listed conditions
•Grounding according to valid regulations
•Leak detection system is tight according to the table in the documentation
•Leak detector is mounted outside the potentially explosive area
•Conduits into and out of dome or control shafts are closed airtight
•Electrical connection cannot be switched off
6.3. Maintenance
(1) Maintenance work and functional tests may only be carried out by trained staff
12
.
(2) Work is carried out once a year to assure functional and operating safety.
(3) Extent of the tests is described in chapter 6.4.
(4) It must be checked whether the conditions described in chapters 4 to 6.3 are being ob-
served.
(5) Disconnect from the mains before opening the leak detector housing.
6.4. Functional test
Tests of the functional and operating safety must be carried out
•after every start-up,
•acc. to chapter 6.3
13
,
•after every case of troubleshooting.
12
For Germany: qualified knowledge or under the responsibility of a qualified person.
For Europe: Authorisation from the manufacturer.
13
For Germany: heed state-specific regulations accordingly (e.g. AwSV)

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6.4.1 Extent of the test
(1) If necessary, discuss the tasks to be carried out with the person responsible on-site.
(2) Heed the safety instructions regarding contact with the stored products present.
(3) Monitoring and emptying the condensate traps if necessary (6.4.2).
(4) Testing the probe if appropriate (chapter 6.4.3)
(5) Check the free passage of air in the interstitial space (chapter 6.4.4).
(6) Test the switching values with the interstitial space (chapter 6.4.5).
Alternatively: test the switching values using the test device (chapter 6.4.6).
(7) Test the lift of the vacuum pump (chapter 6.4.7).
(8) Check tightness of the leak detection system (chapter 6.4.8).
(9) Set up operating state (chapter 6.4.9).
(10) A qualified person must fill out a test report confirming function and operational safety.
6.4.2 Checking and emptying the condensate traps if necessary
(1) If there are shut-off cocks on the interstitial space, close these.
(2) Three-way valve 20 and 21 to position IV to ensure aeration of the connecting lines.
(3) Open condensate traps and empty them. NOTE: Condensate traps can contain storage
product(s), make sure you take suitable precautions.
(4) Close condensate traps.
(5) Three-way valves 20 and 21 to position I.
(6) Open shut-off cocks on the interstitial space.
6.4.3 Testing the probe
(1) If there are shut-off cocks on the interstitial space, close these.
(Not applicable when the probe is installed separately from the leak detector. Also applica-
ble for section (2) and section (6))
(2) Three-way valve 20 in position IV, thus aeration of the connecting line.
(3) Remove probe and check reaction in storage products or water.
(4) Establish optical and audible alarm signal on the leak detector. Press the "mute" button if
necessary.
(5) Clean/dry and insert the probe.
(6) Move three-way valve 20 to position I and open the shut-off cocks.
6.4.4 Checking the free passage of air in the interstitial space
(1) Connect the measuring gauge to three-way valve 21, then position III.
(2) Three-way valve 20 to position IV, thus aeration of the interstitial space.
(3) Determine the drop in pressure on the measuring gauge. If there is no drop in pressure,
establish the cause and eliminate it.
(4) Three-way valve 20 and 21 to position I.
(5) Remove measuring gauge.

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6.4.5 Testing the switching values using the interstitial space
(1) Connect the measuring gauge to three-way valve 21 and three-way valve 21 in position III.
(2) Three-way valve 20 to position IV, thus aeration of the interstitial space.
(3) Determine switching values "pump ON" and "alarm ON" (with optical and audible alarm
signal). Note values.
(4) Press the "mute" button if necessary.
(5) Three-way valve 20 to position I (if necessary, carry out the start-up sequence (see chapter
3.5.2)) and determine switching values "alarm OFF" and "pump OFF". Note values.
(6) The test is considered passed if the switching values measured are within the specified
values.
(7) Three-way valve 21 to position I. If necessary, press "mute" button again.
(8) Remove the measuring gauge.
6.4.6 Testing the switching values using the testing device (P-115 392)
(1) Connect the testing device with both hose-ends on one of the free muffs of three-way
valves 20 and 21 respectively.
(2) Connect the measuring gauge to the T-piece of the testing device.
(3) Close the needle valve of the testing device.
(4) Three-way valves 20 and 21 to position II. Operating pressure is built up in the test tank.
(5) Aerate using the needle valve, determine the "pump ON" and "alarm ON" (optical and au-
dible) switching values. Note values.
(6) Press the "mute" button if necessary.
(7) Carry out the start-up sequence if necessary.
(8) Slowly close the needle valve and determine the switching values "alarm OFF" and "pump
OFF".
(9) The test is considered passed if the switching values measured are within the specified
values.
(10) Three-way valves 20 and 21 to position I. Press the "mute" button if appropriate.
(11) Remove the testing device.
6.4.7 Testing the lift of the vacuum pump
(1) Connect a measuring gauge to three-way valve 20. Three-way valve 20 to position II.
(2) Three-way valve 21 to position II, thus aeration of the pressure switch, the alarm is trig-
gered, the pump runs (carry out the start-up sequence if necessary, to make the pump run)
(3) Read off the lift of the pump on the measuring gauge.
(4) The test is considered passed when the pressure value reached is
> 150 mbar (Type 34 and 30-70),
> 430 mbar (Type 230, 255)
> 500 mbar (Type 330, 230-340),
> 600 mbar (Type 410)
> 680 mbar (Type 500) or
> 750 mbar (Type 570).

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(5) Three-way valve 20 and 21 to position I.
(6) Remove the measuring gauge.
6.4.8 Tightness test on the leak detection system
(1) Check that all the shut-off cocks between the leak detector and interstitial space are open.
(2) Connect the measuring gauge to three-way valve 21, position III.
(3) For the tightness test, the vacuum pump must have reached the "pump OFF" switching val-
ue. Wait for possible pressure compensation and then begin with the tightness test.
(4) It must be evaluated as positive if the values in the following table are observed. A higher
drop in pressure means increased stress on the wear parts.
Volume of interstitial space in liters
1 mbar drop in pressure 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 to position I, remove measuring gauge.
6.4.9 Setting up the operating condition
(1) Seal the housing.
(2) Seal the shut-off cocks (between leak detector and interstitial space) in the open position for
every interstitial space connected.
6.5. Alarm
(1) In case of alarm the "alarm" signal lamp lights up and the audible signal sounds.
(2) If available, close the shut-off cocks in the connection line between interstitial space and
leak detector.
(3) Switch off the audible signal by pressing the "mute" button. The button will light up.
(4) Determine the cause of the alarm signal according to the table in chapter 3.5.1.
(5) Inform the installation company (detailing the cause of the problem if possible).
(6) The installation company has to determine and eliminate the cause.
(7) Carry out the functional test according to chapter 6.4, observing the conditions specified in
chapters 4 to 6.2.

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7. Marking
•Type
•Electrical data
•Manufacturer or manufacturer's mark
•Model year (month/year)
•Serial number
•Statutory marks
8. Index used
01 Signal lamp "alarm", red
01.2 Signal lamp "alarm 2", red (leak probe)
02 Shut-off cock
03 Exhaust line
09 Signal lamp "operation", green
20 Three-way valve in the suction line
21 Three-way valve in the measuring pipe
22 Needle valve
24.1 Fine-wire fuse T 1 A (230 V version)
T 1 A (24 VDC version)
24.2 Fine-wire fuse T 250 mA (230 V version)
T 1 A (24 VDC version)
24.3 Fine-wire fuse T 1 A (230 V version)
T 1 A (24 VDC version)
27 Liquid stop valve
27* Liquid stop valve, connection against the block direction
30 Device housing
33 Condensate trap
36 "Start-up" button
43 Measuring pipe
44 Solenoid valve
52 Measuring gauge
57 Test valve
59 Relay
60 Vacuum pump
61 Check valve with filter
68 Suction line
69 Buzzer
71 "Mute" button
73 Interstitial space
74 Connection line
76 Main PCB
84 Test tank 1 liter
85 Test muff for measuring gauge
88 Double-walled pipe
89 Double-walled battery tank
93 Tank ventilation
95 Pressure compensating vessel

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96 Node point
97 Leak probe (only VL .. E)
98 Sealing plug
101 Suction line leading to low point
102 Pressure sensor
105 Control unit
106 Contacts for serial data transmission
111 Cooling section
112 Insulation