Kobold Heinrichs K12 User manual

Heinrichs Messtechnik GmbH
Operating Manual K12
January 2021
Variable-Area Flowmeter
K12
Operating Instructions
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Heinrichs Messtechnik GmbH
Page 2
Operating Manual K12
Contents
1IDENTIFICATION .......................................................................................................................................4
2APPLICATIONS..........................................................................................................................................5
2.1 K12.......................................................................................................................................................5
2.2 K12-..V / N differential pressure regulator ....................................................................................5
3OPERATIONAL MODE AND SYSTEM DESIGN K12 .................................................................................6
3.1 K12 system design .............................................................................................................................6
3.2 Measuring principle for K12-…V / N ................................................................................................6
3.3 K12-..V / N system design.................................................................................................................6
4INPUT ........................................................................................................................................................7
4.1 Measured variable..............................................................................................................................7
4.2 Measuring ranges...............................................................................................................................7
5ELECTRICAL OUTPUT (OPTION)...............................................................................................................8
5.1 Ad-on limit switches Type RC 10/15-14-XX, Manufacturer Pepperl & Fuchs .............................8
5.2 Ad-on limit switches Type N7R**A, Manufacturer ifm electronic.................................................8
6MEASURING ACCURACY ..........................................................................................................................9
6.1 Reference conditions .........................................................................................................................9
6.2 Measured error...................................................................................................................................9
6.3 Repeatability.......................................................................................................................................9
6.4 Influence of ambient temperature....................................................................................................9
6.5 Influence of fluid temperature..........................................................................................................9
7CONDITIONS OF USE............................................................................................................................. 10
7.1 Safe operation ................................................................................................................................. 10
7.1.1 General conditions for safe operation..........................................................................................................10
7.1.2 Requirements for installation in all environments ...................................................................................10
7.1.3 Requirements for installation dust environments ...................................................................................10
7.1.4 Mounting and commissioning ........................................................................................................................11
7.2 Ambient conditions ......................................................................................................................... 11
7.2.1 Ambient temperature ranges .........................................................................................................................11
7.2.2 Storage temperature .........................................................................................................................................11
7.2.3 Climatic category ................................................................................................................................................11
7.2.4 Degree of protection..........................................................................................................................................11
7.2.5 Shock resistance/vibration resistance.........................................................................................................11
7.2.6 Electromagnetic compatibility........................................................................................................................11
7.3 Fluid conditions ............................................................................................................................... 12
7.3.1 Fluid temperature ranges ................................................................................................................................12
7.3.2 Fluid pressure limit.............................................................................................................................................12
7.3.3 Inlet and outlet sections ...................................................................................................................................12
7.3.4 Physical state.......................................................................................................................................................12
7.3.5 Pressure for gas measurement .....................................................................................................................12
7.3.6 Pressure loss........................................................................................................................................................12

Heinrichs Messtechnik GmbH
Operating Manual K12
Page 3
8CONSTRUCTION DETAILS ..................................................................................................................... 13
8.1 Construction/dimensions K12 ....................................................................................................... 13
8.2 Design / Dimensions / Commissioning V / N (option diff. pressure regulator) ........................ 14
8.2.1 Dimension K12-...V as regulator c/w constant inlet pressure..............................................................14
8.2.2 Dimension K12-…N as regulator c/w constant outlet pressure..........................................................15
8.3 Weights ............................................................................................................................................ 15
8.4 Materials .......................................................................................................................................... 15
8.5 Process connection ......................................................................................................................... 15
9ELECTRICAL CONNECTION FOR LIMIT TRANSDUCER OPTION .......................................................... 16
10 INDICATOR UNIT ................................................................................................................................... 16
11 USE IN HAZARDOUS AREAS ................................................................................................................. 17
11.1 Atmospheric Conditions.................................................................................................................. 17
11.2 Electrostatic charge of non-conductive parts .............................................................................. 17
11.2.1 Grounding..............................................................................................................................................................17
11.3 Mechanical strength ....................................................................................................................... 18
11.4 Without electrical equipment ........................................................................................................ 18
11.5 With limit switch ............................................................................................................................. 18
12 CE MARK ................................................................................................................................................ 19
13 AVAILABLE ACCESSORIES .................................................................................................................... 19
14 ORDER INFORMATION.......................................................................................................................... 19
15 STANDARDS AND DIRECTIVES............................................................................................................. 19
16 SAFETY INSTRUCTIONS ........................................................................................................................ 20
16.1 Intended use .................................................................................................................................... 20
16.2 Installation, commissioning and operating personnel ................................................................ 20
17 PACKAGING, MOUNTING AND SHIPMENT .......................................................................................... 20
18 MAINTENANCE ...................................................................................................................................... 21
18.1 Replacing the measuring cone ....................................................................................................... 21
18.1.1 Removal:................................................................................................................................................................21
18.1.2 Installation:...........................................................................................................................................................21
18.1.3 Abbildungen des Aus- / Einbaus....................................................................................................................22
19 RETURNING DEVICES FOR REPAIR AND SERVICE.............................................................................. 23
20 DECONTAMINATION CERTIFICATE FOR DEVICE CLEANING .............................................................. 24
21 MODEL CODE ......................................................................................................................................... 25
22 DECLARATION OF CONFORMITY.......................................................................................................... 26

Heinrichs Messtechnik GmbH
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Operating Manual K12
1Identification
Manufacturer:
Heinrichs Messtechnik GmbH
Robert-Perthel-Str. 9 
D-50739 Cologne
Germany
Phone: [phone]
Fax: [phone]
Internet: www.heinrichs.eu
E-Mail: [email protected]
Product type:
Miniature flow meter based on the variable area flow meter principle.
Product designation:
K12
Mounting length 125 mm
File name:
K12_BA_21.01_EN.DOC
Version No. /
Issue date:
21.01
18. Januar 2021

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Operating Manual K12
Page 5
2Applications
2.1 K12
The flow meter is suitable for the measurement of the flow of liquid and gaseous products in pipes. It
displays the current flow in volume or mass per unit time.
Applications:
Measuring the flow of liquid and gaseous products in pipes as well as dosing, superimposing, monitoring,
regulating and the controlling of them.
2.2 K12-..V / N differential pressure regulator
The flow meter can be used for stabilizing a constant flow of liquid and gaseous products in pipes. The
flow is kept constant regardless of pressure changes during product inflow for type K12-.N or of a
pressure change during product outflow for type K12-.V.
Applications: Constant dosing, level measurement in open and closed vessels, N2superposition of
combustible media
Caution: The devices should be used with the greatest possible caution when measuring potentially
hazardous liquids and (especially) gases. Precautionary measures must be taken to protect personnel
and equipment from any potential danger or damage resulting from glass-tube breakage. The plant
operator carries full responsible for the use of the devices.
Where possible, we recommend the use of metal devices such as type KDS.

Heinrichs Messtechnik GmbH
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Operating Manual K12
3Operational mode and system design K12
Float principle:
The product flows vertically through the meter from the bottom to the top. The height of the float in the
measuring tube is a measure of the flow quantity.
The float is in equilibrium between the buoyant force of the flowing medium and the counteracting force
of gravity on the float.
The measured value is indicated on the measuring-tube scale with the upper edge or the indicator edge
of the float (ball).
3.1 K12 system design
The meter consists of a conical measuring tube made of glass containing a vertically free-moving float
The height of the float in the measuring tube reproduces the calibrated flow quantities on the measuring
tube.
3.2 Measuring principle for K12-…V / N
Differential pressure regulator:
The diaphragm of the controller is in a state of equilibrium when the pressure conditions are the same on
both sides. The pressure on the input side is determined by the pressure of the product; the pressure on
the output side is determined by the pressure drop of the setting valve of the flowmeter.
If either the inlet or outlet pressure changes, the change in pressure is compensated by the built-in
diaphragm valve - thus maintaining a constant set flow rate.
Important: The regulator can only regulate inlet or outlet pressure fluctuations. Steady pressure
conditions must prevail on each side of the regulator.
3.3 K12-..V / N system design
The unit consists of a K12 variable-area flow meter, equipped with a diaphragm differential pressure
flow regulator. The variable-area flow meter consists of a device fitting with an integrated measuring
tube made of glass that contains a vertically movable float and the valve for setting the flow rate.
The differential pressure flow controller is made of stainless steel and consists of a diaphragm made of
Viton or PTFE and a compensating valve made of stainless steel.
For gaseous products, two versions are available:
K12-...V for a constant inlet pressure and a variable outlet pressure
K12-...N for a constant outlet pressure and a variable inlet pressure
For liquids, both versions can be used; however, the K12-...V version should be favoured.

Heinrichs Messtechnik GmbH
Operating Manual K12
Page 7
4Input
4.1 Measured variable
Volume flow
4.2 Measuring ranges
(lower-range and upper-range values)
Measuring span water 20 °:
Smallest measuring range: 0.02-0.25 l/h water
Largest measuring range: 16-160 l/h water
Measuring span air 20 °C, 1.013 bar abs.
Smallest measuring range: 0.5-5.0 Nl/h air
Largest measuring range: 500-5000 Nl/h air
Measuring /regulating range for K12-..V / N
Span: 10-100 %
Smallest measuring/regulating range
16-160 l/h water
0.5-5 Nl/h air
Largest measuring/ regulating range
16-160 l/h water
500-5000 Nl/h air
Measuring range table
All measurement range values with fully open valve
Measuring ranges water 20 °C
Measuring ranges air 1.013 bar abs. 20 °C
Float st.st. 1.4401 (SS316)
Float st.st. 1.4401 (SS316)
Range
N°
Water
l/h
Float ø
(mm)
Valve
seat ø
(mm)
Press.
loss
(mbar)
Range
N°
air
l/h
Float ø(mm)
Valve
seat ø
(mm)
Press.
loss
(mbar)
17
0.25-2.5
4
1.2
10
07
0.5-5
4
1.2
15
20
0.5-5
4
1.2
20
09
0.8-8
4
1.2
15
25
1.2-12
6
2.8
10
13
1.6-16
4
1.2
15
28
2.5-25
6
2.8
20
21
4-40
4
1.2
20
30
4-40
6
2.8
30
24
6-60
4
1.2
25
35
6-60
6
2.8
80
29
10-100
6
2.8
15
39*
10-100
6
2.8
125
32
25-250
6
2.8
15
40*
12-120
6
3.4
200
37
50-500
6
2.8
15
41*
16-160
6
3.4
200
42
80-800
6
2.8
20
46
100-1000
6
2.8
25
51
180-1800
6
2.8
80
57*
240-2400
6
2.8
125
61*
300-3000
6
2.8
150
64*
400-4000
6
3.4
200
68*
500-5000
6
3.4
200
* Limited adjustment range of the contact / contact can only be adjusted as min. contact

Heinrichs Messtechnik GmbH
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Operating Manual K12
5Electrical output (option)
1 or 2 inductive limit switches,
mono- or bistable
5.1 Ad-on limit switches Type RC 10/15-14-XX, Manufacturer Pepperl & Fuchs
Monostable Type RC 10/15-14-N0
Bistable Type RC 10/15-14-N3
Ex-Marking PTB 99 ATEX 2128 X,
II 2G Ex ia IIC T6 Gb
5.2 Ad-on limit switches Type N7R**A, Manufacturer ifm electronic
Monostable Type N7R28A (I7R2010-N - Inside diameter 10mm)
Type N7R30A (I7R2015-N - Inside diameter 15mm)
Bistable Type N7R29A (I7R2010-NL - Inside diameter 10mm)
Type N7R31A (I7R2015-NL - Inside diameter 15mm)
Ex-Marking BVS 08 ATEX E026 / IECEx BVS 09.0016
II 1G Ex ia IIC T6 Ga
II 1D Ex ia IIIC T85°C Da
When installing electrical equipment in hazardous areas please pay attention to the conditions
specified in the approval certificate.

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Operating Manual K12
Page 9
6Measuring accuracy
6.1 Reference conditions
Water 20 °C (air 20°C ; 1.013 bar abs.)
6.2 Measured error
(Liquid/Gas): K12 2.5 % qG=50 % acc. VDE/VDI 3513 page 2
V / N (option diff.pressure regulator):
Measurement error / regulator deviation 3 % / 5 % of full-scale within 10-100 % of range
6.3 Repeatability
(Liquid/Gas) 1.0 % full-scale,
V / N (optional differential pressure regulator):
Measurement error / regulator deviation: 1.5 % / 2.5 % of full-scale within 10-100 % of range
6.4 Influence of ambient temperature
none
6.5 Influence of fluid temperature
Deviations in fluid temperature from that of the observed temperature during calibration can result in a
proportional display fault because of the corresponding change in density.
Temperature-related changes in viscosity will cause a non-linear display fault.

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Operating Manual K12
7Conditions of use
The VDI/VDE guidelines must be observed.
The devices can be used for:
-liquid products that are sufficiently free-flowing, are free of solids, do not bond or do not tend
to settle.
-gases with linear flow behaviour and an adequate inlet pressure.
V/N (optional differential pressure regulator)
The minimum differential inlet and outlet pressures must amount to 350 mbar.
Please refer to the instructions for potentially hazardous products in Section 2.2.
7.1 Safe operation
7.1.1 General conditions for safe operation
a) If the conditions described in this document are not adhered to, or if there is any inappropriate
interference with the equipment, all the manufactures warranties shall be considered void.
b) Conditions described in this manual, as well as the permitted operating conditions which have been
defined for the sensor and which are stated on the rating plates must be adhered to.
c) Appropriate measures shall be met to prevent any unintentional or inadmissible damage to the device.
d) The operator shall ensure that the equipment is only installed in areas which comply with the approved
types of protection and environments.
e) All connected electrical equipment must be suitable for its intended use.
f) The operator shall ensure protection against lightning according to local regulations.
g) The flowmeter is maintenance-free.
7.1.2 Requirements for installation in all environments
a) The installation of the intrinsically safe circuits requires a control drawing (system description), to be
issued by the operator/erector.
b) The equipment is only to be installed and connected in a de-energized state.
c) It is to be insured that intrinsically safe circuits are not laid together with non-intrinsically safe circuits.
d) Seized screws or adhering joints (e.g. by frost or corrosion) are not to be opened with force in the
presence of a potentially explosive atmosphere.
e) Where substances of explosion group “IIC” or “A” are present and the presence of an Ex-atmosphere is
considered possible, only non-sparking tools shall be used.
7.1.3 Requirements for installation dust environments
a) In certain circumstances, the non-metallic parts of the sensor may generate an ignition-capable level
of electrostatic charge. Therefore, the user/installer shall implement precautions to prevent the build-
up of electrostatic charge, e.g. locate the equipment where a charge-generating mechanism (such as
wind-blown dust) is unlikely to be present.
b) Clean the flowmeter regularly with a damp cloth,
c) Dust deposits with a thickness of more than 5 mm are to be avoided.
d) The flowmeter is to be electrostatically earthed. Electrostatic charging must be avoided.

Heinrichs Messtechnik GmbH
Operating Manual K12
Page 11
7.1.4 Mounting and commissioning
When installing and commissioning the flowmeter, the following points must be observed:
a) The variable-area flow meter must be installed perpendicularly (bottom-up direction of flow).
b) Take special care to install glass-tube devices free from strain.
c) The size of the product line to be connected must be identical to the size of the device connection.
d) All instruments are shipped with the valve installed at the inlet. By flipping the glass tube in its fitting
and then the instrument, the valve also can be positioned at the outlet.
e) V / N: for the measurement of gas, the "valve at the top" version for a constant inlet pressure should
be used and the "valve at the bottom" version for a constant counter pressure. For liquids, the
position of the valve has no impact on the function of the meter.
f) Open the upstream and downstream shut-off valves of the flowmeter slowly.
g) When measuring liquids, vent the pipes carefully.
h) When measuring gases, increase pressure slowly.
i) Avoid float impact (e.g. caused by solenoid valves), impacts may damage the measuring section or/and
float.
7.2 Ambient conditions
7.2.1 Ambient temperature ranges
without limit switch -20 °C to +100 °C
with limit switch -20 °C to +70 °C
Risk of breakage due to frost
7.2.2 Storage temperature
-20 °C to +100 °C
7.2.3 Climatic category
Weather-protected and/or unheated locations,
-Class C according to IEC 654 Part 1
7.2.4 Degree of protection
IP65 (DIN EN 60529)
7.2.5 Shock resistance/vibration resistance
The meter should be protected against shocks and vibrations, which could cause damage to the glass
tube.
7.2.6 Electromagnetic compatibility
Built in limit switch:
-acc. NAMUR recommendation NE 21
-Product standard: EN 60947-5-2

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Operating Manual K12
7.3 Fluid conditions
7.3.1 Fluid temperature ranges
without limit switch -20 °C to + 100 °C
with limit switch -20 °C to + 70 °C
Risk of breakage due to frost
7.3.2 Fluid pressure limit
Max. 16 bar (20 °C)
Important:
All pressure values are for non-hazardous liquids and for devices installed free from strain.
For K12-…V/N, the maximum unilateral pressure resistance of the diaphragm is 7 bar.
7.3.3 Inlet and outlet sections
Inlet and outlet sections are not required for a linear flow profile of the fluid.
7.3.4 Physical state
Liquid or gaseous
7.3.5 Pressure for gas measurement
The measured values only apply to the calibrated fluid data stated on the scale. Any change or deviation
in pressure will cause a display fault.
7.3.6 Pressure loss
Depends on the measuring range
(see measuring range tables in Section 4.2)

Heinrichs Messtechnik GmbH
Operating Manual K12
Page 13
8Construction details
8.1 Construction/dimensions K12
The meter consists of a conical measuring tube made of borosilicate glass, with a vertical movable float
made of stainless steel or glass glass (optionally, for types K12-L/E, the float may be made of
aluminium). The measuring tube is mounted vertically in the device fitting, which possesses two process
connections, arranged perpendicularly to the measuring tube, on its rear.
The standard version of the device is equipped with a setting valve.
K12 (dimensions in mm)
K12 with contact terminal box
K12 c/w panel mounting set

Heinrichs Messtechnik GmbH
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Operating Manual K12
8.2 Design / Dimensions / Commissioning V / N (option diff. pressure regulator)
Differential pressure regulators are used to achieve constant flow values at variable inlet and outlet
pressures.
Caution! Differential pressure regulators are not pressure reduction valves
The measuring device consists of a variable area flowmeter with control valve and mounted differential
pressure regulator.
The flow amount can be adjusted via the integrated adjusting valve.
The max.one sided pressure resistance of the regulator membrane is 7 bar. If the operating pressure
exceeds 7 bar, the control valve must not be fully closed as this leads into overstressing the membrane.
IMPORTANT OPERATION DETAILS
The installation of a valve before the inlet and outlet of the instrument shall be avoided
Initial operation / start-up of the process only with opened control valve
When operating with gas the inlet pressure shall be increased slowly to avoid strong pressure
peaks.
To prevent excessive acceleration of the float, operation of the instrument by means of solenoid
valves should be avoided.
For the operation of the regulator minimum inlet pressures are required.
Regulator with constant outlet pressure: 350 mbar
Regulator with constant inlet pressure: 350 mbar
8.2.1 Dimension K12-...V as regulator c/w constant inlet pressure

Heinrichs Messtechnik GmbH
Operating Manual K12
Page 15
8.2.2 Dimension K12-…N as regulator c/w constant outlet pressure
8.3 Weights
K12 0.46 kg
K12-…V/N 0.80 kg
8.4 Materials
Fitting, connections, setting valve: 1.4404 (SS316L) / 1.4571 (SS316 TI),
Float: 1.4401 (SS304)
Seals
measuring tube: viton, FFKM (option)
Valve: PTFE,
Hose-fittings: PA
V/N (option differential pressure regulator)
Regulator/control pipes: 1.4301(SS304)
Membrane: Viton or PTFE
8.5 Process connection
Standard: NPT¼“ (F)
Special connections: Ermeto, Swagelok, G ¼“, Hose connector 8 mm
Note: Other connections are available as special versions

Heinrichs Messtechnik GmbH
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Operating Manual K12
Wiring diagram for 2 limit transducers
9Electrical connection for limit transducer option
with cable end length of 2 m
When using two switch contacts the distance between both contacts must be minimum 16 mm.
10 Indicator unit
Direct indication via the position of the float in the measuring tube.
The limit switch (ring form) can be adjusted alongside of
the measuring tube. It is fixed via two screws (1) at the
back wall of the unit.
Adjusting of the contact:
-unscrew the fixing screw (1)
-move contact (2) to bottom or top
-lock fixing screws (1)
ATTENTION: (limited switching range)
For the measuring tubes / glasses N° 40, 41, 61, 64
and 68 the contact cannot be
moved to the max. flow range.
2
2
Inductive contact Type: RC 10/15-14 NO/N3
PTB 99 ATEX 2128 X
II 2G Ex ia IIC T6 Gb
Hazardous area
Inductive contact Type: N7R**A
BVS 08 ATEX E026, IECEx BVS 09.0016,
II 1G Ex ia IIC T6 Ga II 1D Ex ia IIIC T85°C Da
II 1G Ga Ex ia IIC TX Ga II 1D Ex ia IIIC TX°C Da
(2) Contact on
measuring tube
Safe area
Switch amplifier

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Operating Manual K12
Page 17
11 Use in hazardous areas
Only devices with Ex-markings may be operated within areas with potentially explosive atmospheres.
Ambient temp.
Process-Temp.
Marking
Zone
Description
-20 °C ...+70 °C
-25 °C ...+70 °C
II 2G Ex h IIC T6 Gb
II 2D Ex h IIIC T85°C Db
1
With built-in switch,
observe the type
certificate of the contact
manufacturer!
-20 °C ...+100 °C
-40 °C ...+100 °C
II 2G Ex h IIC T6...T5 Gb
II 2D Ex h IIIC
T85°C…T100°C Db
1
As a pure mechanical
device
11.1 Atmospheric Conditions
According to EN 1127-1, a “potentially explosive atmosphere“ is defined as a mixture of air and
combustible gases, vapour, mist or dust under atmospheric conditions. These conditions are defined in
DIN EN ISO 80079-36, para. 1, with values Tatm = -20 °C to +60 C and Patm = 0.8 to 1.1 bar. Outside of
this range, safety parameters for most ignition sources are not available.
The operating conditions inside the measuring tubes of variable-area flow meters generally lie outside the
atmospheric conditions of 0.8 to 1.1 bar. Therefore, due to the lack of safety parameters, the explosion
protection does not apply to the process conditions inside of the measuring tube, irrespective of the zone
classification.
Operation with combustible products is therefore only permissible if a potentially explosive air mixture is
not formed inside the flow meter. Where this condition is not met, the operator is required to assess the
ignition hazard in each individual case giving due consideration to existing parameters (e.g. pressure,
temperature, process product, materials)
11.2 Electrostatic charge of non-conductive parts
In hazardous areas the risk of electrostatic charge in dangerous quantities must be considered
during cleaning of the measuring tubes synthetic cover.
Devices where explosive electrostatic charges are to be expected are marked with an adhesive label.
Use a damp cloth for cleaning of the synthetic materials.
Caution! Danger of electrostatic charge! Do not rub!
11.2.1 Grounding
In variable-area flow meters, under operating conditions it is possible for charge separation to occur
in the measuring tube due to the transport of non-conductive fluids.
For this reason, variable-area flow meters must be permanently grounded by the operator by way of
the process connections (flanges) to ensure the discharge of electrostatic build-up.

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Operating Manual K12
If grounding cannot be guaranteed via the process connections (e.g. plastic process connections), the
flow meter must be connected to the local ground potential via the flanges. This connection only
ensures electrostatic grounding of the device and does not meet the requirements for equipotential
bonding.
Grounding with an
add-on terminal case.
Grounding without an
add-on terminal case.
11.3 Mechanical strength
The device with its glass measuring tube is to be mounted in such a way that it is protected from
mechanical damages.
11.4 Without electrical equipment
The basic version of the flow meter is a non-electrical device without its own ignition source and meets
DIN EN ISO 80079-36 requirements. It can be used in hazardous areas that require Category 2 equipment.
Markings
II 2G Ex h IIC TX Gb
II 2D Ex h IIIC TX°C Db
Reg. No.: BVS 10 ATEX H-B 034
Tech. File Reg. No. HM-K09-32-ATEX-10-02-X
Since the device does not possess its own power sources that could lead to a temperature increase, the
fluid temperature is decisive for the maximum surface temperature.
11.5 With limit switch
With the installation of a limit switch, the device becomes an electrical assembly and receives an
additional marking in accordance with DIN EN 60079-0.
The electrical and thermal data and the special conditions of the relevant EU Type Examination Certificate
must be observed.
Marking of the limit transducer:
Manufacturer Pepperl & Fuchs
Type: RC 10/15-14 NO/N3
PTB 99 ATEX 2128 X
II 2G Ex ia IIC T6 Gb
Manufacturer ifm electronic
Type: N7R**A
BVS 08 ATEX E026 / IECEx BVS 09.0016,
II 1G Ex ia IIC T6 Ga
II 1D Ex ia IIIC T85°C Da
The influence of the fluid temperature on the built-in limit transducer must be observed.

Heinrichs Messtechnik GmbH
Operating Manual K12
Page 19
12 CE mark
The measuring system meets the statutory requirements of the following EU directives:
2014/34/EU (ATEX) Equipment for Use in Potentially Explosive Atmospheres
2014/30/EU (EMC) Electromagnetic Compatibility.
With respect to the Pressure Equipment Directive 2014/68/EU, the devices fall within the scope of
application of Article 4, Paragraph 3, and therefore requires no CE marking in accordance with this
directive.
By attaching the CE logo, Heinrichs Messtechnik confirms compliance with these directives.
13 Available accessories
1 or 2 1 inductive limit switches ; mono-stable or bi-stable Special connections
Special connections
14 Order information
Please include the following information in your order:
Product data,(specific weight, temperature, pressure, viscosity) material design, connection size,
measuring range, desired accessories, required approvals and material certificates.
15 Standards and directives
VDE/VDI 3513 Measuring range rated and converted to other products
Directive 2014/34/EU ATEX: Equipment for Use in Potentially Explosive Atmospheres
DIN EN ISO 80079-36 Non-electrical equipment for use in potentially Explosive Atmospheres
For the electrical sensor:
EN 60079-0 Explosion protection; General regulations
EN 60079-11 Explosion protection; intrinsical safety
Directive 2014/30/EU EMC directive
NAMUR NE 21 recommendation: EMC for industrial processes and laboratory
EN 60529 Degrees of protection through housing (IP code)
EN 61010-1 Safety requirements for electrical measure, control & laboratory devices
EN 60947-5-6:2000 Low voltage switchgear and controlgear (NAMUR)

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Operating Manual K12
16 Safety instructions
16.1 Intended use
The K12 variable-area flowmeter may be used only for flow measurements of fluid and gaseous media.
The manufacturer shall not be liable for damage that may result from improper or unintended use.
When dealing with an aggressive medium, the material durability of all wetted parts is to be clarified.
16.2 Installation, commissioning and operating personnel
Only trained specialists authorized by the system operator may carry out the montage, electrical
installations, commissioning, maintenance and operation. They must have read and understood the
operating manual and follow its instructions.
Always adhere to the conditions and provisions applicable in the country of installation.
17 Packaging, mounting and shipment
Take care whilst unpacking the device to avoid damaging it. With the help of the delivery note enclosed in
the packaging, check whether all technically relevant data coincide with your requirements.
Storage and installation must be performed in a clean and dry room to avoid –especially of the interior of
the fitting –contamination.
The boundary values for the ambient temperature are to be adhered to.
When transporting the device to a remote mounting location, we recommend to reuse the factory-issued
packaging and the transport protection.