SIKA induQ VMZ.2 Series User manual

Please keep this operating manual for future reference.
If the device is resold, please provide the operating manual along with it.
© SIKA • Ba_VMZ.2_en • 08/2020 .
Magnetic Inductive Flow Sensor
Series VMZ.2
Types VMZ03 / VMZ06 / VMZ08 / VMZ15 / VMZ20 / VMZ25
Operating manual
Operating manual
..................................................page 1 - 20

— VMZ.2
- 2 - © SIKA • Ba_VMZ.2_en • 08/2020
Table of contents page
0About this operating manual......................................................................................3
1Device description.....................................................................................................4
1.1 Delivery, unpacking and accessories ......................................................................4
1.2 Intended use ...........................................................................................................5
1.3 Exclusion of liability .................................................................................................5
2Safety instructions.....................................................................................................6
3Construction and function..........................................................................................7
4Installation of VMZ.2..................................................................................................8
4.1 Installation instructions............................................................................................8
4.2 Assembly.................................................................................................................9
5Electrical connection ...............................................................................................10
5.1 Wirings ..................................................................................................................11
6Commissioning and measuring operation ...............................................................12
6.1 Commissioning......................................................................................................12
6.2 Switching on and off..............................................................................................12
6.3 Measuring operation .............................................................................................12
7Maintenance and cleaning ......................................................................................13
7.1 Return shipment to the manufacturer....................................................................13
8Disassembly and disposal.......................................................................................14
9Technical data.........................................................................................................15
9.1 Characteristics VMZ.2...........................................................................................15
9.2 Materials table.......................................................................................................16
9.3 Dimensions ...........................................................................................................17
is a registered trademark of SIKA Dr. Siebert & Kühn GmbH & Co. KG.
Copyright notice:
The reproduction, distribution and utilization of this operating manual as well as the communication
of its contents to others without express authorization is prohibited. Offenders will be held liable for
the payment of damages. All rights reserved in the event of the grant of a patent, utility model or de-
sign.

— VMZ.2 About this operating manual
Technical changes reserved - 3 -
0 About this operating manual
•The operating manual is aimed at specialists and semi-skilled personnel.
•Before each step, read through the relevant advice carefully and keep to the specified
order.
•Thoroughly read and understand the information in the section “Safety instructions”.
If you have any problems or questions, please contact your supplier or contact us directly
at:
Dr. Siebert & Kühn GmbH & Co. KG
Struthweg 7-9 • D - 34260 Kaufungen
[phone] • [phone]
[e-mail] • www.sika.net
Hazard signs and other symbols used:
WARNING! / CAUTION! Risk of injury!
This sign indicates dangers that cause personal injuries that can lead to health defects or
cause considerable damage to property.
CAUTION! Electric current!
This sign indicates dangers which could arise from handling of electric current.
CAUTION! Material damage!
This sign indicates actions which could lead to possible damage to material or environmental
damage.
ADHERE TO OPERATING MANUAL!
NOTICE!
This symbol indicates important notices,
tips or information.
NO DOMESTIC WASTE!
The device must not be disposed of to-
gether with domestic waste.
Pay attention to and comply with infor-
mation that is marked with this symbol.
Follow the specified instructions and steps.
Adhere to the given order.

Check the specified points or notices.
Reference to another section, document or
source.
• Item.

Device description — VMZ.2
- 4 - © SIKA • Ba_VMZ.2_en • 08/2020
1 Device description
The of the VMZ.2 series from SIKA is a flow sensor without moving parts. The
measurement is performed using magnetic induction.
The VMZ.2 is used for measuring or metering water and electrically conductive fluids. The
compact design and independence from the intake and discharge sections allows the VMZ.2
to be used under a variety of conditions.
Versions:
The VMZ.2 is available in different nominal sizes from DN 3 to DN 25.
Type plate:
You can find the type plate on the back of the VMZ.2.
It contains the most important technical data.
1.1 Delivery, unpacking and accessories
All units have been carefully checked for their operational reliability before shipment.
Immediately after receipt, please check the outer packaging for damages or any signs of
improper handling.
Report any possible damages to the forwarder and your responsible sales representative.
In such a case, state a description of the defect, the type and the serial number of the de-
vice.
Report any in-transit damage immediately. Damage reported at a later date shall not be
recognized.
Unpacking:
Carefully unpack the unit to prevent any damage.
Check the completeness of the delivery based on the delivery note.
Scope of delivery:
1x VMZ.2 according to the order data.
1x Operating manual.
IMPORTANT!
Use the type plate to check if the delivered unit corresponds to your order.
In particular, for devices with electrical components, check to see if the correct power
supply voltage is specified.

— VMZ.2 Device description
Technical changes reserved - 5 -
Accessories:
Connection cable with moulded M12x1 coupling socket.
M12x1 coupling socket as component.
1.2 Intended use
The magnetic inductive flow sensor VMZ.2 must only be used for measuring and metering
liquids with a minimum conductivity of 20 μS/cm.
WARNING! No safety component!
The magnetic inductive flow sensor of the series VMZ.2 is no safety component in ac-
cordance with Directive 2006/42/EC (Machine Directive).
Never use the VMZ.2 as a safety component.
The operational safety of the device supplied is only guaranteed by intended use. The speci-
fied limits (§ 9 “Technical data”) may under no circumstances be exceeded.
Before installing the device, check that the wetted materials of the device are compatible with
the media being used (§ 9.2 “Materials table”).
Measuring tube empty (or partially filled). / Conductivity too low.
The green LED may blink irregularly if the measuring tube of the VMZ.2 is empty or par-
tially filled or if the conductivity of the fluid being used is too low. Random pulses will be
present at the output, but they do not represent an actual flow.
Ensure that the measuring tube of the VMZ.2 is always completely filled
(§ 4.1 “Installation instructions”).
Ensure that the conductivity of the fluid is at least 20 μS/cm.
1.3 Exclusion of liability
We accept no liability for any damage or malfunctions resulting from incorrect installation, in-
appropriate use of the device or failure to follow the instructions in this operating manual.

Safety instructions — VMZ.2
- 6 - © SIKA • Ba_VMZ.2_en • 08/2020
2 Safety instructions
Before you install the VMZ.2, read through this operating manual carefully. If the instructions con-
tained within it are not followed, in particular the safety guidelines, this could result in danger for
people, the environment, and the device and the system it is connected to.
The VMZ.2 corresponds to the state-of-the-art technology. This concerns the accuracy, the
operating mode and the safe operation of the device.
In order to guarantee that the device operates safely, the operator must act competently and
be conscious of safety issues.
SIKA provides support for the use of its products either personally or via relevant literature.
The customer verifies that our product is fit for purpose based on our technical information.
The customer performs customer- and application-specific tests to ensure that the product is
suitable for the intended use. With this verification all hazards and risks are transferred to our
customers; our warranty is not valid.
Qualified personnel:
•The personnel who are charged for the installation, operation and maintenance of the
VMZ.2 must hold a relevant qualification. This can be based on training or relevant tui-
tion.
The personnel must be aware of this operating manual and have access to it at all times.
•The electrical connection should only be carried out by a fully qualified electrician.
General safety instructions:
•In all work, the existing national regulations for accident prevention and safety in the
workplace must be complied with. Any internal regulations of the operator must also be
complied with, even if these are not mentioned in this manual.
•Degree of protection according to EN 60529:
Please ensure that the ambient conditions at the site of use does not exceed the re-
quirements for the stated protection rating (§ 9 “Technical data”).
•Prevent freezing of the medium in the device with appropriate measures.
•Only use the VMZ.2 if it is in perfect condition. Damaged or faulty devices must be
checked without delay and, if necessary, replaced.
•When fitting, connecting and removing use only suitable appropriate tools.
•Do not remove or obliterate type plates or other markings on the device, as otherwise the
warranty is rendered null and void.
Special safety instructions:
•Crystallizing liquids:
Liquids which crystallize when dried out can cause a malfunction of the VMZ.2.
Make sure that the VMZ.2 is not run dry.
Prevent the crystallization of the fluid in the device by taking appropriate measures.
Further warnings that are specifically relevant to individual operating procedures or activities
can be found at the beginning of the relevant sections of this operating manual.

— VMZ.2 Construction and function
Technical changes reserved - 7 -
3 Construction and function
Components:
Housing:
The Housing consists of plastic and has the
IP65 degree of protection.
Electrical connection:
The electrical connection is made via 4-pin
plug M12x1.
Process connection:
The process connections are available in dif-
ferent sizes.
Operation / flow indicator LED.
Construction:
The measuring tube with its earthing sleeves and electrodes passes
through the housing and forms the external process connection of the
VMZ.2.
A magnetic field for the measurement process is generated inside the
housing, which also contains the sensor and signal conditioning circuit-
ry.
The two stainless steel electrodes are located in the middle of the
measuring tube between the earthing sleeves.
The VMZ.2 does not need any moving parts to make measurements. The inside of the
measuring tube is completely open, allowing the fluid to flow unhindered through the measur-
ing tube.
Function:
The magnetic inductive flow sensor functions according to the induction principle. A DC volt-
age is generated by the movement of a conductor in a magnetic field:
The measuring tube of the VMZ.2 is located in a mag-
netic field (B).
An electrically conductive medium (V) flows through
the measuring tube. The positive and negative charge
carriers are oppositely deflected.
A voltage (U) is generated at right angles to the mag-
netic field, which is picked up by the two electrodes.
Thereby, the induced voltage is proportional to the av-
erage flow velocity of the liquid.
The electronics of the VMZ.2 converts the induced
voltage into a flow-proportional frequency signal.

Installation of VMZ.2 — VMZ.2
- 8 - © SIKA • Ba_VMZ.2_en • 08/2020
4 Installation of VMZ.2
Before installing, check that
the wetted materials of the device are suitable for the media being used
(§ 9.2 “Materials table”).
the equipment is switched off and is in a safe and de-energised state.
the equipment is depressurised and has cooled down.
SUITABLE TOOLS:
Use only suitable tools of the correct size.
4.1 Installation instructions
CAUTION! Risk of malfunction due to external magnet-
ic fields!
Magnetic fields close to the device can cause malfunctions and
should be avoided.
Ensure that no external magnetic fields are present at the installa-
tion site of the VMZ.2.
•The VMZ.2 can always be installed anywhere along the pipeline.
However, straight sections of piping are preferable.
Bubble-formation / run empty possible
Dirt deposits
possible
Run empty
possible
Dirt deposits
possible

— VMZ.2 Installation of VMZ.2
Technical changes reserved - 9 -
•Installation can occur in horizontal and vertical pipes. The flow sensor is only suitable for
application in completely filled pipe systems.
•As a matter of principle magnetic inductive flow sensors are widely independent from the
flow profile. An inlet section is not absolutely necessary.
To reach a most highly accuracy of the measurement, you should use straight inlet and
outlet sections according to the nominal width (DN). The inlet section has to be at least
10 x DN; the outlet section 5 x DN in order to achieve the specified accuracy.
•The inlet and outlet sections and the gaskets must have the
same or a slightly larger inside diameter than the measuring
tube in order to achieve the specified accuracy.
•If two or more VMZ.2 devices are used side by side, maintain
a separation of at least 2.5 cm between adjacent devices.
If adjacent devices are too close together, operation of both
devices may be impaired due to mutual interference.
4.2 Assembly
The VMZ.2 is installed directly into the pipeline. The compact design and light weight of the
unit make wall-mounting unnecessary.
IMPORTANT NOTICES:
• Only use suitable gaskets for installation.
• Observe the flow direction indicated on the type plate.
• Observe the mounting dimensions (§ 9.3 “Dimensions”).
Select an appropriate location for installation
(§ 4.1 “Installation instructions”).
To ensure the best possible measuring accuracy, a vertical
installation position with increasing flow is preferable (no col-
lecting of dirt deposits).
Install the appropriate screwed connections at the installation
location.
Insert the VMZ.2 together with the gaskets.
Screw the union nuts of the screwed connection onto the pro-
cess connections of the VMZ.2.
CAUTION! Material damage!
Maximum torque 5 Nm.
While tightening, counter the VMZ.2 only by hand!
If you use an open-end or a pipe wrench, the VMZ.2 can be
damaged.
Tighten both union nuts with a maximum torque of 5 Nm.

Electrical connection — VMZ.2
- 10 - © SIKA • Ba_VMZ.2_en • 08/2020
5 Electrical connection
The electrical connection of the VMZ.2 is made via the 4-pin plug M12x1 at the top of the
housing.
The wiring of the VMZ.2 depends on the ordered version. A distinction is made between fre-
quency output or analogue output and frequency output.
CAUTION! Electric current!
The electrical connection should only be carried out by a fully qualified electrician.
De-energize the electrical system before connecting the VMZ.2.
Connection cable:
Suitable connection cables with moulded coupling socket M12x1 are available in different
lengths as SIKA accessories. The maximum permissible cable length is 10 m.
Connection 4-pin plug M12x1:
Screw the coupling socket of the connection cable to the plug of the VMZ.2.
Tighten the knurled nut of the coupling socket with a maximum torque of 1 Nm.

— VMZ.2 Electrical connection
Technical changes reserved - 11 -
5.1 Wirings
Pinout:
The pinout differs according to the chosen configuration of the device.
Pinout:
M12x1
Possible pinout:
Pin 1: +UB
Pin 2: n. c. (not connected) / Analogue U/I
Pin 3: GND
Pin 4: Frequency
Connect the connection cable according to your version and the pinout on the type plate.
Supply voltage:
VMZ.2 with frequency output:
Push-Pull: NPN Open Collector: PNP Open Collector:
*1: Push-Pull switching outputs of several VMZ.2 may not be connected in parallel.
*2: Recommendation Pull-Up / Pull-Down resistance RL~2.5 kΩ (12 V) or ~5 kΩ (24 V).
Ensure that the maximum signal current of 25 mA is not exceeded.
Use of frequency and analogue output
Push-Pull: NPN Open Collector: PNP Open Collector:
Recommendation for resistance RL~2.5 kΩ (12 V) or ~5 kΩ (24 V).
Ensure that the maximum signal current of 25 mA is not exceeded.

Commissioning and measuring operation — VMZ.2
- 12 - © SIKA • Ba_VMZ.2_en • 08/2020
6 Commissioning and measuring operation
Before switching on the VMZ.2 for the first time, please follow the instructions in the following
section.
6.1 Commissioning
Check that
the VMZ.2 has been installed correctly and that all screw connections are sealed.
the electrical wiring has been connected properly.
the measuring system is vented by flushing.
6.2 Switching on and off
The VMZ.2 has no switch and cannot be switched on or off on its own. Switching on and off
is carried out by the applied supply voltage.
Switch on the supply voltage.
The green LED lights up. The VMZ.2 is ready and goes into measuring mode.
6.3 Measuring operation
In the measuring mode, the green LED flashes proportional to the measured flow.
For the human eye, the flashing is no longer visible from a frequency of ~30...40 Hz.
The green LED then seems to light up permanently.
VMZ.2 with frequency output:
The VMZ.2 provides according to the version
a flow proportional NPN, PNP or Push-Pull
square wave signal.
The frequency of the pulse output changes
according to the flow (Fig.).
VMZ.2 with analogue output:
According to the configuration of the VMZ.2, the analogue output provides a voltage or cur-
rent signal.
This signal is proportional to the measured flow. You will find the scaling of the analogue out-
put on the type plate.

— VMZ.2 Maintenance and cleaning
Technical changes reserved - 13 -
7 Maintenance and cleaning
Maintenance:
The VMZ.2 is maintenance-free and cannot be repaired by the user. In case of a defect, the
device must be replaced or sent back the manufacturer for repair.
CAUTION! Material damage!
When opening the device, critical parts or components can be damage.
Never open the device and perform any repair yourself.
Cleaning:
Clean the VMZ.2 with a dry or slightly damp lint-free cloth. Do not use sharp objects or ag-
gressive agents for cleaning.
7.1 Return shipment to the manufacturer
Due to legal requirements placed on environmental protection and occupational safety and
health and to maintain the health and safety of our employees, all units returned to SIKA for
repair must be free of toxins and hazardous substances. That also applies to cavities in the
devices. If necessary, the customer must neutralise or purge the unit before return to SIKA.
Costs incurred due to inadequate cleaning of the device and possible costs for disposal
and/or personal injuries will be billed to the operating company.
WARNING! Risk of injury due to insufficient cleaning!
The operating company is responsible for all damages and harm of any kind, in particular
physical injuries (e.g. caustic burns or toxic contaminations), decontamination measures,
disposal etc. that can be attributed to insufficient cleaning of the measuring instrument.
Comply with the instructions below before returning the unit.
The following measures must be taken before you send the unit to SIKA for repair:
Clean the device thoroughly. This is of extreme importance if the medium is hazardous to
health, i.e. caustic, toxic, carcinogenic or radioactive etc.
Remove all residues of the media and pay special attention to sealing grooves and slits.
Attach a note describing the malfunction, state the application field and the chemi-
cal/physical properties of the media.
Please follow the instructions on the procedure for sending returns which are on our
website (www.sika.net/en/services/return-of-products-rma.html) and please specify a
point of contact in case our service department has any questions.
The customer must confirm that the measures were taken by filling out the declaration of de-
contamination. It can be found on our website as a download:
www.sika.net/images/RMA/Formular_Warenruecksendung.pdf

Disassembly and disposal — VMZ.2
- 14 - © SIKA • Ba_VMZ.2_en • 08/2020
8 Disassembly and disposal
CAUTION! Risk of injury!
Never remove the device from a plant in operation.
Make sure that the plant is shut down professionally.
Before disassembly:
Prior to disassembly, ensure that
the equipment is switched off and is in a safe and de-energised state.
the equipment is depressurised and has cooled down.
Disassembly:
Remove the electrical connectors.
Remove the VMZ.2 using suitable tools.
Disposal:
Compliant with the Directives 2011/65/EU (RoHS) and 2012/19/EU (WEEE)*, the device
must be disposed of separately as electrical and electronic waste.
NO HOUSEHOLD WASTE!
The VMZ.2 consists of various different materials. It must not be disposed of with house-
hold waste.
Take the VMZ.2 to your local recycling plant
or
send the VMZ.2 back to your supplier or to SIKA.
* WEEE reg. no.: DE 25976360

— VMZ.2 Technical data
Technical changes reserved - 15 -
9 Technical data
The technical data of customised versions may differ from the data in these instructions.
Please observe the information specified on the type plate.
9.1 Characteristics VMZ.2
Type
VMZ03 VMZ06 VMZ08 VMZ15 VMZ20 VMZ25
Measurement device characteristics
Flow range [l/min]
0.1…2
0.25..5
1…20
2.5…50
5…200
12.5…250
Accuracy*
±0.7 % of reading ±0.3 % of range
Repeatability
±1%
Output signal starting
from [l/min]
0.05
0.1
0.25
1
4
5
Max. flow rate [l/min]
2.5
6
25
60
240
300
Response time
< 100 ms
Indication
LED green, flow proportional flashing
Output signal characteristics
Frequency output:
- Pulse rate / K-Factor
[pulses/l]
10 000
4000
1000
400
200
80
- Resolution [ml/pulse]
0.1
0.25
1.0
2.5
5.0
12.5
- Signal shape
Square wave signal • duty cycle 50:50
Push-Pull • NPN open collector • PNP open collector
- Signal current
≤100 mA
Analogue output 4...20 mA (optional)
Corresponds to flow rate
[l/min]
0...2
0...5
0…20
0…50
0…200
0…250
Max. burden
250 Ω to GND
Analogue output 0.5...10 V (optional)
Corresponds to flow rate
[l/min]
0...2
0...5
0…20
0…50
0…200
0…250
Electrical characteristics
Supply voltage
12...24 VDC (±10 %)**
Power consumption
Max 3.6 W
Electrical protection
measures
short-circuit proof • protected against polarity reversal
Electrical connection
4-pin plug M12x1
Degree of protection
(EN 60529)
IP 65 (only with a connected coupling)
* test conditions: Water 23 °C
** Voltage output 0.5…10 V only available with 16…24 VDC

Technical data — VMZ.2
- 16 - © SIKA • Ba_VMZ.2_en • 08/2020
Type
VMZ03 VMZ06 VMZ08 VMZ15 VMZ20 VMZ25
Process variables
Medium to measure
Water and other conductive liquids
- Conductivity
> 20 μS/cm
- Temperature
-10…60 °C (non-freezing)
Ambient temperature
5…60 °C
Storage temperature
-15…60 °C
Nominal diameter
DN 3
DN 6
DN 8
DN 15
DN 20
DN 25
Inner diameter
3 mm
8 x 2 mm
8 mm
14 mm
18 mm
25 mm
Max. working pressure
(at … °C)
10 bar (20 °C) • 8 bar (40 °C) • 6 bar (60 °C)
higher pressure ratings on request
Process connection
- male thread
G⅜B
G½ B
G½ B
G¾ B
G1 B
G1¼ B
9.2 Materials table
Component
Material
Component-
wetted
Housing
ABS
Measuring tube
POM or PVDF (option)
X
Process connections
POM or PVDF (option)
X
O-ring
EPDM or FKM (option)
X
Electrodes and earthing rings
Stainless steel 1.4404 or Hastelloy C®*
X
* Available for VMZ03, VMZ06, VMZ08, VMZ25

— VMZ.2 Technical data
Technical changes reserved - 17 -
9.3 Dimensions
VMZ.2 DN 3 / DN 6 /DN 8 / DN 15 / DN 20:
VMZ06
Type
L1
L2
D1
D2
VMZ03
85 13 G⅜ B Ø 3
VMZ06
85 13 G½ B Ø 8 x 2
VMZ08
85 13 G½ B Ø 8
VMZ15
90 16 G¾ B Ø 14
VMZ20 90 16 G1 B Ø 18
VMZ.2 DN 25:
L1
58
M12x1
13.5
D2
89
36
D1
L2
LED
122
65
13.5
M12x1
25
120
60
28.5
LED
G11/4

— VMZ.2
- 18 - © SIKA • Ba_VMZ.2_en • 08/2020
For your notes

— VMZ.2
Technical changes reserved - 19 -
For your notes

© SIKA • Ba_VMZ.2_en • 08/2020
SIKA Dr. Siebert & Kühn GmbH & Co. KG
Struthweg 7–9
34260 Kaufungen / Germany
[phone]
[phone]
[e-mail]
www.sika.net