SGB DLR-P CV Series Operator's manual

Documentation
Pressure leak detector DLR-P .. CV
Please read the instructions before commencing any work
Last updated: 07/2020
Item no.: 604442

PRESSURE LEAK DETECTOR DLR-P .. CV 30 July 2020
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Contents
1.General.................................................................................4
1.1Information .....................................................................4
1.2Explanation of symbols ..................................................4
1.3Limitation of liability ........................................................4
1.4Copyright........................................................................4
1.5Warranty.........................................................................5
1.6Customer Service...........................................................5
2.Safety....................................................................................6
2.1Intended Use..................................................................6
2.2Responsibility of the operating company........................6
2.3Qualification....................................................................7
2.4Personal protective equipment.......................................7
2.5Basic Hazards ................................................................8
3.Technical data of the leak detector ...................................9
3.1General Data ..................................................................9
3.2Electrical data.................................................................9
3.3Switching values.............................................................9
3.4Application area..............................................................10
4.Design and function............................................................12
4.1Design ............................................................................12
4.2Normal operation............................................................14
4.3Function in the event of a leak .......................................14
4.4Dry filter..........................................................................15
4.5Display and control elements .........................................15
5.Installation of the system ...................................................17
5.1General Information........................................................17
5.2Leak detector..................................................................17
5.3Dry filter..........................................................................17
5.4Pneumatic connection lines, requirements.....................18
5.5Making pneumatic connections ......................................18
5.6Electrical cables .............................................................19
5.7Electrical connection ......................................................20
5.8Installation examples......................................................22
6.Start-up.................................................................................26
6.1Leak tightness test .........................................................26
6.2Commissioning the leak detector ...................................26
7.Function test and maintenance .........................................28
7.1General...........................................................................28
7.2Maintenance...................................................................28
7.3Function test...................................................................29
8.Alarm (fault) .........................................................................32
8.1Alarm..............................................................................32
8.2Fault ...............................................................................32
8.3Behavior .........................................................................32
9.Spare parts...........................................................................33
10.Accessories .........................................................................34
Contents

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11.Disassembly and disposal .................................................35
11.1Disassembly ..............................................................35
11.2Disposal.....................................................................35
12.Appendix..............................................................................36
12.1Dimensions and drilling pattern, plastic housing .......36
12.2Dimensions and drilling pattern, stainless steel
housing for outdoor installation (IP 54)......................37
12.4Overview of the ex-zone arrangement
(Z-078 092R) .............................................................39
12.5Declaration of EU conformity.....................................40
12.6Declaration of performance ....................................... 41
12.7Manufacturer’s declaration of conformity...................41
12.8Certifications TÜV Nord.............................................42
Contents

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1. General
1.1 Information
This manual provides important information for handling the
DLR-P .. CV leak detector. The precondition for safe working is com-
pliance with all the specified safety information and instructions for
action.
In addition, all the applicable local accident prevention regulations
and general safety instructions must be complied with at the operat-
ing site of the leak detector.
1.2 Explanation of symbols
Warnings in this manual are indicated by a symbol next to them.
The signal word expresses the level of risk.
DANGER:
An immediately hazardous situation that results in death or serious in-
juries if not avoided.
WARNING:
A potentially hazardous situation that can result in death or serious in-
juries if not avoided.
CAUTION:
A potentially hazardous situation that can result in minor or slight inju-
ries if not avoided.
Information:
Highlights useful tips, recommendations and information.
1.3 Limitation of liability
All the data and information in this documentation have been com-
piled taking account of applicable standards and regulations, the cur-
rent state of technology and our many years of experience.
SGB will not accept liability for:
non-compliance with this manual,
improper use,
deployment of unqualified personnel,
unauthorized conversions,
connection to systems not approved by SGB.
1.4 Copyright
The contents, texts, drawings, pictures, and any other representations
are protected by copyright and are subject to industrial property
rights. Any misuse is a criminal offence.
General



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1.5 Warranty
We provide 24 months of warranty on the DLR-P .. CV leak detector
from the day of installation on-site in accordance with our General
Terms and Conditions of Sale and Delivery.
The warranty period is a maximum of 27 months from our date of
sale.
The prerequisite for any warranty is the presentation of the func-
tion/test report about initial commissioning by trained personnel.
Specification of the serial number of the leak detector is required.
The warranty obligation is rendered null and void in the case of
- Inadequate or incorrect installation
- Improper operation
- changes/repairs without the manufacturer’s consent.
Our warranty does not include parts, which may be perished prema-
ture due to their consistence or category of usage (e.g. pumps,
valves, gaskets, etc.). Furthermore, we are not liable for defects or
corrosion damages caused by humid or inappropriate installation en-
vironments.
1.6 Customer Service
Our Customer Service department is available to provide you with in-
formation.
You can find information about contacts on the World Wide Web at
sgb.de or on the rating plate of the leak detector.
General

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2. Safety
2.1 Intended Use
For underground, double-walled plastic pipes
The inner pipe is unpressurised (= filling, intake or ventilation pipe)
Pressure resistance of the interstitial space at least PN 5
Earthing/equipotential bonding in accordance with applicable regu-
lations1.
Leak tightness of the leak detection system according to section
6.1
Leak detector must be installed outside Ex-zone.
Explosive vapor-air mixtures cannot be drawn in through the dry fil-
ter.
Feedthroughs for connection lines into and out of the manhole
shaft are sealed gas-tight.
The leak detector should be (electrically) connected in a way which
cannot be switched off.
Due to the use of air as leak detection medium, the following
points must be observed for stored media with flashpoint ≤60 °C
(Germany ≤55°C in accordance with TRGS - technical regulation
on hazardous substances - 509 and 751):
oExplosive vapor-air mixtures must be able to be classified with
temperature codes T1 to T3 and in the gas group II A.
The max. temperature increase during filling may not exceed 40°C
The area in which the leak detector is installed must be well-
ventilated.
The yearly functional check must be performed according to this
documentation including the sequence provided.
Any claims resulting from misuse will not be accepted.
2.2 Responsibility of the operating company
The DLR-P .. CV leak detector is used in the industrial sector. The
operating company must therefore comply with statutory occupational
health and safety requirements.
In addition to the safety information in this documentation, all the ap-
plicable safety, accident prevention and environmental protection
regulations must be complied with. In particular:
- Compilation of a hazard analysis and implementation of its results
in operating instructions
- Regular checking of whether the operating instructions comply
with the current state of regulations
- The content of the operating instructions may also be the reaction
to a possible alarm
- Instigation of an annual function test
1For Germany: e.g. EN 1127
WARNING!
Danger from
misuse
WARNING!
Hazard in the
case of incom-
plete documen-
tation
Safety

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2.3 Qualification
The personnel must be sufficiently qualified to recognize and avoid
possible dangers on their own.
Companies that put the leak detector into operation should have been
trained at SGB, by SGB or by the authorized representative.
National regulations must be complied with.
For Germany:
Specialist company qualification for the installation, commissioning
and maintenance of leak detection systems.
2.4 Personal protective equipment
Personal safety equipment must be worn during work.
- Wear the necessary protective equipment for the respective work
- Observe and comply with any signs concerning PPE
Entry in the "Safety Book"
"Wear a warning vest"
Wear safety shoes
Wear a protective helmet
Wear gloves - where necessary
Wear protective goggles - where necessary
2.4.1 Personal protective equipment (PPE) on systems where explosion hazards can arise
The parts listed here particularly apply to safety when working on sys-
tems where explosion hazards can arise.
WARNING!
Danger to people
and the environ-
ment in the case
of insufficient
qualification
Safety

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If work is carried out in areas with a potentially explosive atmosphere,
the following items of equipment are required as an absolute mini-
mum:
Suitable clothing (risk of a build-up of electrostatic charge)
Suitable tools (compliant with EN 1127)
A suitable gas warning device which is calibrated for the existing
vapor-air mixture (work should only be performed at a concentra-
tion of 50 % below the lower explosion limit)2
Measuring device for determining the oxygen content of the air
(Ex/O meter)
2.5 Basic Hazards
DANGER
From electric current
When working on the leak detector, it must be disconnected from the
power supply unless otherwise stated in the documentation.
Comply with the relevant regulations for electrical installations, where
appropriate explosion protection (e.g. EN 60 079-17) and accident
protection regulations.
DANGER
From explosive vapor-air mixtures
The absence of gas must be established before carrying out work.
Comply with explosion protection regulations, such as the German
BetrSichV (or the Directive 1999/92/EC and the resulting laws in the
respective member states) and/or others.
DANGER
When working in shafts
Leak detectors are to be installed outside of manhole shafts. Pneu-
matic connections are to be set up as usual in the manhole shaft. The
shaft must be entered to perform the installation.
Before entry, the appropriate protection measures must be imple-
mented and the absence of gas and sufficient oxygen must be en-
sured.
2Other percentages may be applicable according to national, regional or plant-specific regulations.
Safety

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3. Technical data of the leak detector
3.1 General Data
Dimensions and drilling template: see appendix, section 12.1 to 12.2
Weight: 2.7 kg (plastic housing)
4.3 kg (VA housing)
Storage temperature range -40°C to +70°C
Operational temperature range 0°C to +40°C (plastic housing)
-40°C to +60°C (VA housing)
Protection rating of the housing: IP 30 (plastic housing)
IP 54 (VA housing)
3.2 Electrical data
Power supply 100 to 240 VAC, 50/60 Hz
optional: 24 VDC
Power consumption: 50 W
Terminals 5, 6, external signal: max: 24 VDC; max. 300 mA
Terminals 11…13 (floating): DC: ≤25 W or AC ≤50 VA
Terminals 17…19 (floating): DC: ≤25 W or AC ≤50 VA
Fuse protection: max. 10 A
Overvoltage category: 2
3.3 Switching values
Type
DLR-P .. CV pDP [bar] pAL_ON [bar] pPO [bar] pTEST [bar]
1.1 < 0.1 > 1.1 < 1.45 5.0
1.5 < 0.5 > 1.5 < 1.9 5.0
2.0 < 1.0 > 2.0 < 2.4 5.0
Special values agreed between SGB and the
customer.
pDP Max. delivery pressure in the inner pipe
pAL_ON "Alarm ON" switching value – an alarm is triggered at the lat-
est when this value is reached
pPA "Pump OFF“ switching value (=setpoint pressure)
pTEST Minimum test pressure of the interstitial space
Supplement to table:
pAL_OFF "Alarm OFF" switching value – the alarm is cancelled when
this value is exceeded.The switching value "Alarm OFF" is
approximately 100 mbar higher than the switching value
"Alarm ON" (pAL_OFF = pAL_ON + ~100 mbar)
pPU_ON "Pump ON" switching valueThe switching value "Pump ON“
is around 100 mbar lower than the switching value "Pump
OFF" (pPU_ON = pPU_OFF - ~100 mbar)
Technical Data

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3.4 Application area
3.4.1 Requirements for the interstitial space
oVerification of the pressure resistance of the interstitial space (see
3.3, switching values, table, column "pTEST" for the minimum test
pressure of the interstitial space)
oVerification of the suitability of the interstitial space (for Germany:
building authority certificate of suitability).
oSufficient passage in the interstitial space for the air leak detection
medium.
oTightness of the interstitial space according to this documentation.
oThe number of interstitial spaces to be monitored depends on the
overall volume of the interstitial space. According to EN 13160, this
must not exceed 10 m3. In order to make it possible to verify the
leak tightness of the interstitial space, we recommend that a value
of 4 m3is not exceeded.
The length of pipe which is to be monitored (per branch) should not
exceed 2500 m or as specified in the approval requirements of the
pipeline.
3.4.2 Pipelines
Underground double-walled plastic pipes, which are used as filling, in-
take or gas recirculation pipes and with a pressure rating in the inter-
stitial space of at least PN 5.
For Germany: More far reaching requirements may result from the
corresponding approvals or from the TRBS, the DIBt approval princi-
ples or EN 13160.
3.4.3 Materials conveyed
oLiquids which are hazardous to waters with a flash point > 60°C
(Germany: > 55 °C in accordance with TRGS 509 and 751)
oLiquids which are hazardous to waters with a flash point ≤60 °C
(Germany: > 55 °C in accordance with TRGS 509 and 751).
On pipes which are permanently filled with liquid, it must be en-
sured that the equipment carrying the product (delivery pumps,
etc.) is suitable for zone 0, as air is forced into the product in the
event of a leak.
oThe material being conveyed must not react with the leak detec-
tion medium.
oThe resistance of the pipeline to the material being conveyed and
its vapors must be verified by third parties (e.g. operator, manufac-
turer of the pipeline/fittings, etc.).
3.4.4 Additional clarification on explosion protection
This leak detector is for use on double-walled plastic pipes, in which
permeation into the interstitial space cannot be excluded with the
consequence of possible zone 0 conditions.
Technical Data

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Based on this approach, additional measures are to be implemented:
oSuitable flame barriers (designed to deal with overpressure) at
every inlet to the interstitial space.
oCheck valve in the connection line, to prevent back-flow of poten-
tially explosive vapor-air mixtures. The check valve (CV) is in-
stalled under the leak detector in the pulsation damper.
oAn overpressure valve cannot be used; therefore, the test pres-
sure of the interstitial space must be clearly above the operational
pressure of the leak detector.
Technical Data

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4. Design and function
4.1 Design
Interior view of plastic housing with:
01 Signal lamp – "Alarm" – red
09 Signal lamp – "Operation" – green
17 Overpressure pump
62 Check valve
69 Buzzer
71 “Mute” button
75 Display board
76 Main circuit board
102 Pressure sensor
140 Contact for serial data transfer
160 CV, check valve as isolator
Design and function
75
17
09
62
01
71
69
76
102
160
140

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Interior view of stainless steel, weather-proof housing with pulsation damper,
with:
17 Overpressure pump
20 Three-way valve in the pressure line
21 Three-way valve in the measuring line
62 Check valve
64 Dust filter
69 Buzzer
75 Display board
76 Main circuit board
102 Pressure sensor
140 Contact for serial data transfer
141 Keypad connection
160 CV, check valve as isolator
Design and function
75
64
62
69
76
102
21
140
141
17
20
160

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The pressure leak detector DLR-P..CV monitors both walls of the
double-walled system for leaks. The monitoring pressure under nor-
mal operating conditions is higher than any other pressure applied to
the inner or outer wall, so that leaks are indicated through a drop in
pressure.
Air is used as a leak detection medium. This is dried via the dry filter
in the suction pipe to less than 10% relative humidity. Used dry filter
cartridges must be regenerated or replaced.
The current pressure is shown in mbar/bar or in PSI on the display
screen3:
oValues under 150 mbar or 2.18 PSI are not displayed.
oValues up to 990 mbar are displayed in mbar without any decimal
places.
oValues over 1 bar are displayed with two decimal places.
oValues in PSI are displayed to one or two decimal place(s).
4.2 Normal operation
The leak detector is connected via the connection line(s) to the inter-
stitial space(s). The overpressure generated by the pump is meas-
ured by a pressure sensor and regulated.
When the operating pressure (Pump OFF) is reached the pump is
switched off. Due to unavoidable leaks in the leak indication system,
the pressure starts to slowly drop again. When the switching pressure
"Pump ON" is reached the pump is switched on and the system
builds operating pressure back up again.
Depending on the leak tightness and temperature fluctuations of the
overall system, the overpressure alternates between the "Feed OFF"
and "Feed ON" switching values.
4.3 Function in the event of a leak
If a leak occurs on the inside wall or the outside wall then air will es-
cape from the interstitial space. The pressure will drop until the over-
pressure pump is switched on in order to restore operating pressure.
If the volumetric flow escaping through the leak is greater than the
(limited) delivery rate of the pump then the pressure in the system
drops and the pump runs in continuous operation.
Any increase in the leak results in further pressure loss until eventual-
ly the alarm pressure is reached. At this point the system will gener-
ate visual, acoustic and floating alarm outputs.
3The conversion between bar and PSI is carried out at the manufacturing plant, but this conversion can also be carried
out on site upon consultation with the manufacturer.
Design and function

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4.4 Dry filter
A dry filter is needed to dry the drawn-in ambient air enough so that
no condensation occurs in the interstitial space.
The minimum requirement for underground interstitial spaces is a TF
200; but larger ones can also be used. The dry filter is designed to
last for a year provided the equipment is used for its proper intended
purpose and no additional temperature fluctuations occur.
Type
Max. volume (liters) of the interstitial space with
TF 200 TF 400 TF 600 TF 1200
DLR-P 1.1 400 750 1150 2600
DLR-P 1.5 300 650 800 1850
DLR-P 2.0
Initially the dry filter is an orange color, but this fades to a colorless
state (or green) when the filter has been used up. Once the filter car-
tridge has been used up it should be replaced or regenerated.
4.5 Display and control elements
4.5.1 Display
Signal
lamp
Operating
status
Alarm
status
Alarm, acous-
tic alarm sig-
nal acknowl-
edged/reset
Device fault
OPERA-
TION:
green
ON ON ON ON
ALARM:
red
OFF ON FLASHING ON
LED yellow
Without function or in the event that dry filter monitoring is connect-
ed, the yellow and red LEDs flash alternately.
4.5.2 Function: "Switch off audible alarm signal”
Briefly press the "mute" button once – the audible alarm signal is then
switched off and the red LED flashes.
Pressing the button again switches on the audible signal.
This function is not available in normal operation and for malfunc-
tions.
Design and function

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4.5.3 Function: "Test visual and audible alarm signal"
Press the "mute" button and keep it pressed (approx. 10 seconds) –
the alarm signal is triggered until the button is released again.
This test is only possible if the pressure in the system has exceeded
the "Alarm OFF" pressure level.
4.5.4 Function: "Test leak tightness"
Press the "mute" button and keep it pressed until the signal lamp
flashes quickly, then release the button. A value for the leak tightness
is indicated on the optional display. The same value is shown by the
number of flashes of the “Alarm” signal lamp.
This display goes off after 10 seconds and the current underpressure
in the system is displayed again.
For the “test leak tightness” function the leak detector must have per-
formed at least 1 automatic feed interval in normal operating condi-
tions (i.e. without being filled/evacuated by an assembly pump) in or-
der to obtain a valid result.
It is recommended to perform this test before performing any recur-
ring functional check of a leak detector. This makes it possible to di-
rectly assess whether to look for leaks.
Number of flashing signals Assessment of the leak tightness
0 Very leak tight
1 to 3 Leak tight
4 to 6 Sufficiently leak tight
7 to 8 Maintenance recommended
9 to 10 Maintenance urgently recommended
The smaller the above value, the tighter the system is. The meaning-
fulness of this value also depends on temperature fluctuations and
should therefore be considered as an indicative value.
4.5.5 Acknowledgement of the "Dry filter alarm" (only when the filter control FC is present)
Press "Dry filter message acknowledgement" button briefly so that the
audible signal is switched off. The visual display (alternating flashing
of the red and yellow LEDs) continues.
For complete reset of the dry filter alarm, press the button and keep
pressed until an audible signal sounds.
Design and function
(103)

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5. Installation of the system
5.1 General Information
oBefore starting work, the documentation must be read and under-
stood. If anything is unclear, please contact the manufacturer.
oThe safety instructions in this documentation must be observed.
oInstallation and assembly must only be performed by qualified
companies
oThe relevant accident prevention regulations must be complied
with.
oFeedthroughs for pneumatic and electrical connection lines, via
which the Ex atmosphere can spread, must be sealed so that they
are gas-tight.
oComply with explosion protection regulations (if required), such as
the German BetrSichV (or the Directive 1999/92/EC and the re-
sulting laws in the respective member states) and/or others.
oIf nitrogen is used for the initial pressurization of the interstitial
space, corresponding safety precautions are to be taken (e.g. se-
cure canister, use a suitable pressure reducer, ventilation in room
and shafts, etc.).
oA test valve should be provided at the end of the pipe(s)/fitting(s)
away from the leak detector.
oBefore entering inspection chambers, check the oxygen content
and, if necessary, flush the inspection chamber.
oWhen metal connection lines are used, it must be ensured that
the mains power supply earth has the same potential as the pip-
ing to be monitored.
oHints for personal protective equipment are listed in chapter 2.4.
5.2 Leak detector
(1) Usually wall-mounted with wall plugs and screws.
(2) NOT in potentially explosive atmospheres.
(3) Plastic housing: in a dry room
(4) VA housing: outdoors or in the building
(5) Dimensions of the housings and hole patterns are shown in ap-
pendices 12.1 to 12.2.
(6) If several double-walled pipes are connected to a leak detector, a
shut-off valve is to be provided for each branch.
5.3 Dry filter
(1) Preferably close to the leak detector.
(2) Installed in such a way that under no circumstances will explo-
sive vapor-air mixtures be drawn in.
Installation

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(3) Attachment with mounting materials supplied.
TF 180: Vertical with intake opening facing downwards
TF 200, 300, 400, 600, 1200: Vertical with intake opening facing
upwards, if possible, near the leak detector
(4) The dry filter and intake connection port of the leak detector
should be connected via a PVC hose (or similar).
5.4 Pneumatic connection lines, requirements
oMetal (usually copper) or plastic pipes with a pressure resistance
corresponding to at least the test pressure of the interstitial space
– also applies for valves and screw connections. Observe the tem-
perature range, particularly when using plastic.
oClear width at least 6 mm for air as leak detection medium
oLength should not exceed 50 m, but if it does: use a pipe with a
greater clear width together with bridging pieces.
oThe full cross section must be maintained. Pinching and kinking4
are not permitted.
oMetal or plastic pipes laid underground and plastic pipes laid over-
ground should be laid inside a protective pipe.
oThe protective tube should be sealed gas-tight and protected to
prevent liquids from penetrating inside.
oAvoid any build-up of electrostatic charge (e.g. when drawing in
lines).
oPressure and measuring lines are joined under the leak detector
by the pulsation damper.
oAll conducting parts must be linked to each other. The bleeder re-
sistance must be ≤106𝛺at the same time.
5.5 Making pneumatic connections
5.5.1 Fitting the connection to the interstitial space, or test valves
(1) As a rule, according to the specifications of the manufacturer of
the pipeline/interstitial space.
(2) If Schrader valves are used, the following points are to be ob-
served:
- Unscrew protective cap
- Tighten locknut
- Remove valve insert and tape down close to the connection
with a piece of adhesive tape.
- Screw the connection on to the interstitial space or test valve
and tighten by hand.
- If necessary, tighten further with suitable pliers.
4
Commercially available moulded parts (with given bending radii) may need to be used for plastic pipes
Installation

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5.5.2 Between the leak detector and the interstitial space
(1) Select and lay suitable pipe.
(2) When laying the hose/pipe, check that the hoses are protected
against damage when the manhole is inspected.
(3) Observe earthing/potential equalization of metal parts in non-
conductive connection lines.
(4) Create the appropriate connection (according to the depictions in
the following images)
5.5.2.1 Flange screw connection (for flanged pipes)
(1) Lubricate O-rings
(2) Insert spacer ring loosely into the screw socket
(3) Slide union nut and pressure ring over the pipe
(4) Hand-tighten union nut
(5) Tighten union nut until need for increased force is clearly notice-
able
(6) Final assembly: Tighten by another ¼ turn
5.5.2.2 Clamping ring screw connection for metal and plastic pipes
(1) Insert support sleeve (only plastic pipe) into end of the pipe
(2) Insert pipe (with support sleeve) as far as the stop
(3) Tighten nut of screw connection by hand to the resistance; then
turn further 1¾ turns with the wrench
(4) Loosen nut
(5) Tighten nut by hand until stop is felt
(6) Final fitting of the screw connection by tightening ¼ turn
5.5.2.3 Quick screw connection for PA hose
(1) Cut the pipe to length at a right angle
(2) Unscrew union nut and push it over the pipe end
(3) Push pipe on nipple as far as the threaded end
(4) Tighten the union nut by hand
(5) Tighten the union nut with a spanner until there is a noticeable
increase in force (approx. 1 to 2 turns)
5.6 Electrical cables
Mains power connection:
Suggested cable: Ölflex Classic 100
- 2.5 mm2without wire end ferrule
- 1.5 mm2with wire end ferrule and plastic collar
Installation

PRESSURE LEAK DETECTOR DLR-P .. CV 30 July 2020
- 20 -
Floating contacts and external signal:
Suggested cable: Ölflex Truck 1700
- 1.5 mm2without wire end ferrule
- 0.75 mm2with wire end ferrule and plastic collar
5.7 Electrical connection
(1) Power supply in the range of 100 to 240 V (terminals 1/2) or di-
rect with 24 V DC at terminals 40/41.
(2) Hard-wired, i.e. no plug-in or switchable connections.
(3) The regulations of the electricity supply companies must be satis-
fied5.
(4) Terminal assignment (Also see section 5.8.3/5.8.4 block dia-
grams):
1/2 Network connection (100…240 V AC)
Note: Both terminals are duplicated!
3/4 Assigned (to internal pump)
5/6 External signal (24 V DC in the event of an alarm - it
is switched off by pressing the "Audible alarm" but-
ton).
11/12 Potential-free contacts (open in the event of an alarm
and in the event of a power failure)
12/13 As above, however closed contacts
17/18/19 Potential-free contacts, while power failure:
17/18 closed
18/19 open
Potential-free contacts, while pump running:
17/18 open
18/19 closed
21/22 Assigned (to internal sensor)
40/41 24 V DC as permanent power supply for supplying
other components or the power supply is connected
here for a device using 24 V DC supply voltage.
5For Germany: also, VDE regulations