Kirchner und Tochter KFS Series User manual

Version 6.3
Dieselstraße 17 · D-47228 Duisburg
Internet: www.kt-ow.de · e-mail: info@kt-ow.de
A. Kirchner & Tochter GmbH
Fon: [phone] · Fax: [phone]
Assembly and operating Instructions
Flap-type Flow Meter
KFS
KFS-RK1, KFS-RK2
KFS-IK1, KFS-IK2
KFS-IKS1, KFS-IKS2
KFS-EM, KFS EMZ
KFS Ex
KFS-IK1 Ex, KFS-IK2 Ex
KFS-EM Ex, KFS EMZ Ex
For use of the KFS device in hazardous areas, refer to the
"Supplementary installation and operating instructions - ap-type
ow meter KFS ... Ex"!

Version 6.3
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-2-
Contents
1 General ...................................................................................................................4
1.1 Foreword ..........................................................................................................4
1.2 Exemption from liability .....................................................................................4
2 Safety .....................................................................................................................4
2.1 Symbol and meaning .......................................................................................4
2.2 General safety directions ..................................................................................4
2.3 Intended use .....................................................................................................5
2.4 Information for Operator and operating personnel ...........................................5
2.5 Regulations and directives ...............................................................................5
2.6 Compliance with the IP degree of protection ....................................................5
2.7 Note for the use of equipment in Ex-proof version ...........................................6
2.8 Notice as required by the hazardous materials directive ..................................6
3 Transport and storage ............................................................................................6
4 Measuring principle of the ap-type ow meter ......................................................6
5 Installation, start-up and maintenance of the mechanical part ...............................7
5.1 Preparatory work ..............................................................................................7
5.2 Installation of the KFS ......................................................................................7
5.3 Start-up .............................................................................................................8
5.4 Maintenance .....................................................................................................8
5.4.1 Compliance with IP protection - KFS with standard indicator part ............10
5.4.2 Setting the reference point - KFS with standard indicator part .................10
5.4.3 Replacement of scale - KFS with standard indicator part .........................10
5.4.4 Setting the pointer reference point - KFS-EM ...........................................11
5.4.5 Replacement of scale - KFS-EM ..............................................................11
5.4.6 Removal of the EM-indicator part from the pressurized measuringpoint .11
6 Installation, start-up and maintenance of devices with electrical add-on equipment
12
6.1 Preparatory work for installation and maintenance ........................................12
6.2 Devices with standard indicator casing ..........................................................12
6.2.1 Cabling of the contacts .............................................................................12
6.2.2 Setting the switching points ......................................................................13
6.2.3 KFS-RK1, KFS-RK2 ................................................................................13
6.2.4 KFS-IK1 , KFS-IK2 ...................................................................................14
6.2.5 KFS-IK1 with ATEX approval ....................................................................16
6.2.6 KFS-IKS1, KFS-IKS2 ...............................................................................17
6.3 The indicator part M40 ....................................................................................18
Contents

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KFS
Flap-type flow meters
6.3.1 Versions ....................................................................................................18
6.3.2 Electrical signal output KFS-EM ...............................................................18
6.3.3 Compliance with IP-degree of protection ..................................................19
6.4 Electrical connection KFS-EM ........................................................................20
6.4.1 HART® communication with ESK4 ..........................................................22
6.4.2 ESK4 - Loop Check Mode ........................................................................23
6.4.3 Technical Data EM ....................................................................................24
6.5 Plug-in contact unit IK1, IK2, IKS1, IKS2 ........................................................25
6.5.1 Electrical connection .................................................................................25
6.5.2 Setting the limit value ...............................................................................27
6.5.3 Switching contact denition ......................................................................27
6.5.4 Denition MINMIN - MAXMAX ..................................................................27
6.5.5 Technical Data ..........................................................................................28
6.5.6 Electrical data hazardous area .................................................................28
6.6 Replacement - Retrotting an ESK4 and its calibration ..................................29
6.7 Retrotting a second limit value switch ...........................................................30
6.8 Flow Totalizer KFS-EMZ .................................................................................30
6.9 Component overview for electrical Retrot .....................................................32
7 Service ..................................................................................................................33
8 Disposal ................................................................................................................33
9 Technical Data ......................................................................................................34
9.1 General technical data ....................................................................................34
9.2 Materials .........................................................................................................35
9.3 Measuring ranges H2O ...................................................................................36
9.4 Measuring ranges air ......................................................................................37
9.5 Dimensions and weights .................................................................................37
9.6 M12 Right angle plug ......................................................................................39
10 Spare parts, accessories ......................................................................................40
10.1 KFS with standard idicator part and limit value switches ................................40
10.2 KFS-EM ..........................................................................................................42
10.3 Assembly aid KFS-M40/EM (optional) ............................................................43

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1 General
1.1 Foreword
These Installation and Operating Instructions are applicable to devices
of Series KFS. Please follow all instructions and information given for
installation, operation, inspection and maintenance. The Instructions form
a component part of the device, and should be kept in an appropriate place
accessible to the personnel in the vicinity of the location. Where various plant
components are operated together, the operating instructions pertaining to
the other devices should also be observed.
1.2 Exemption from liability
Kirchner und Tochter accepts no liability for any damage or interruptions of
operation resulting from human error, failure to comply with these installation
and operating instructions, improper performance of installation and repair
work, use of spare parts other than those from the original manufacturers or
use of the KFS devices other than for the intended purpose.
2 Safety
2.1 Symbol and meaning
2.2 General safety directions
These Installation and Operating Instructions contain basic instructions for
the installation, operation, inspection and maintenance of the ow meter.
Failure to comply with these Instructions or improperly executed installation,
wiring and repair work can lead to serious faults in the plant, giving rise to
hazardous situations for "man and beast“ as well as damage to property.
The operator is required to rule out potentially hazardous situations through
voltage and released media energy.
Safety notice
This symbol is placed against all directions/information relating to
occupational health and safety in these Installation and Operating
Instructions and draws attention to danger to life and limb. Such notices
should be strictly observed.

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KFS
Flap-type flow meters
2.3 Intended use
The KFS devices are designed and intended for measuring the ow of liquids
and gases. They may only be installed between anges in the pipeline.
Select the KFS device model on the basis of the nominal diameter and
nominal pressure at the site and also the kind of uid product concerned;
limit values are specied in the sect. 9 "Technical data" and should not be
exceeded. Only devices that bear the "Ex" marking may be operated in
hazardous areas.
2.4 Information for Operator and operating personnel
2.5 Regulations and directives
In addition to the regulations mentioned below, pay attention without
fail to the notices given in sect. 2.7 for operation in hazardous areas!
All relevant regulations should be observed in respect of ow meter
operation. These include in particular:
● Regulation concerning explosion protection (11. ProdSV, 2014/34/EU)
● Regulation concerning safe working conditions
(BetrSichV , 2009/104/EG)
● If appropriate, regulation concerning hazardous materials
● Accident prevention regulations
● Pressure Equipment Directive PED (2014/68/EU)
2.6 Compliance with the IP degree of protection
Devices with standard indicator parts have IP66 degree of protection, with
M40 indicator part P68 degree of protection. In the case of maintenance work
involving the indicator parts, notes on maintaining the IP degree of protection
are given in sect. 5.4.1, 6.1 und 6.3.3 (KFS-EM).
Authorized installation, operating, inspection and maintenance personnel
should be suitably qualied for the jobs assigned to them and should receive
appropriate training and instruction. All persons charged with assembly,
mounting, operation, inspection and maintenance duties must have read
and understood the operating instructions. Gaskets in contact with the uid
product must be replaced after all maintenance and repair work.

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2.7 Note for the use of equipment in Ex-proof version
The KFS, KFS-IK1/2 and KFS-EM ow meters are certied for use in
hazardous areas Zone 1 and 2, device categories 2 and 3, atmosphere Gb,
according to Directive 2014/34/EU. For such use, the regulation concerning
electrical and non-electrical devices in hazardous areas
(Directive 2014/34/EU) is to be observed.
For use of the devices in hazardous areas, refer to the
"Supplementary installation and operating instructions - Flap-
type ow meter KFS ... Ex“.Due to possible static charges, the
polycarbonate enclosure of the indicator part of KFS Ex and
KFS-IK1/2 Ex devices may only be cleaned with a damp cloth.
2.8 Notice as required by the hazardous materials directive
In accordance with the law concerning handling of waste (critical waste)
and the hazardous materials directive (general duty to protect), we would
point out that all ow meters returned to Kirchner und Tochter for repair
are required to be free from any and all hazardous substances (alkaline
solutions, acids, solvents, etc.).
Make sure that devices are thoroughly rinsed out to neutralize
hazardous substances. Cavities in the KFS also have to be
neutralized. For this purpose, open the neck of the KFS ring by
dismantling the indicator (detach the ange connection between the
KFS ring and the magnet casing). This includes the screws, Item 9 in
the drawing in sect. 10.1, and Item 15 in the drawing in sect. 10.2).
3 Transport and storage
4 Measuring principle of the ap-type ow meter
A half-round plate, or ap, is fastened across the direction of ow to a spring-
mounted rotating spindle in a ring that is inserted between anges in a
pipeline. As the ow rate increases, the ap rotates counter to the restoring
force of the spring in the direction of ow. The ensuing angle of rotation,
depending on the volume rate of ow, is transmitted via a magnetic coupling
to the indicator part
Always use the original packing for transport, handling and storage. Protect
the device against rough handling, coarse impact, jolts etc.

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KFS
Flap-type flow meters
5 Installation, start-up and maintenance of the
mechanical part
5.1 Preparatory work
Have ready anges and fastening materials as specied in EN 1092-1
for mounting the device between anges. Between the anges, include a
distance of ring thickness plus 4 mm for the gaskets. Refer to assembly
dimensions in sect. 9.5.
Check the inside diameter of your pipeline and the gaskets. Neither should
be smaller than the inside diameter of the KFS. If they are, the measuring
ap will jam. Straight unimpeded pipe runs upstream and downstream of the
installation location should have lengths equal to 4 - 6 times the nominal
size DN.
The mounting location for control equipment should be provided downstream
of the ow meter. Make sure that the anges are in alignment and the sealing
faces parallel to one another.
5.2 Installation of the KFS
● Generally comply with the maximum pressure and maximum
temperature levels allowable for the KFS at the measuring point in your
plant.
● The direction of ow must be the same as that indicated by the ow
arrow on the device.
● Drain the pipelines before installing the device.
● Use gaskets made of rubber or SIL; for plastics devices, use only
gaskets made of rubber with a Shore hardness A of approx. 65°.
● The gaskets should not project into the pipeline and the ow meter must
be in line with the pipe axis, otherwise measurements would be falsied
and/or the device could jam.
Incorporating the indicator part in the equipotential bonding system in
hazardous areas: The indicator part must be grounded. This can be done
e.g. using a wire jumper between the ange on the indicator part and a
pipe ange on the main pipeline with cable lugs appropriate for the bolted
connection (not included with the ow meter!).
Incorporating the indicator in the lightning protection system (if necessary).
The Operator is responsible for checking and determining the scope!
Tighten threaded joints for the KFS made of PVC, PP or PVDF only with
max. 75 Nm; higher torques may cause the ap spindle to jam and/or the
device ring to break. The device version made of PVC, PP or PVDF is not
allowed to be used in hazardous areas.

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5.3 Start-up
Pressurize the measuring pipeline. Avoid water hammer or ow separation.
Check the ange connections for leak-tightness and retighten bolted
connections if necessary.
Test the local indicator on the device with varying volumetric ow rates,
starting with the maximum value.
5.4 Maintenance
The device is normally maintenance-free. Should it become soiled, it
will need to be removed from the pipeline for cleaning. Devices tted
with contacts must be disconnected from supply and de-energized.
To dismantle the device you will need the following tools: 2x open-jawed
spanner, jaw span 13 mm, 1x open-jawed spanner, jaw span 7 mm, 1x
screwdriver 4x 0.6 mm, 1x socket spanner, size 7 mm, up to DN 100, or 1x
socket spanner, size 8 mm, up to DN 250, or 1x socket spanner, size 10 mm,
for DN 300 and higher. Required spares: 2x gasket. After dismantling, check
all parts for signs of damage, corrosion, wear, etc., and replace if necessary!
● If necessary, wear personal protective gear (safety goggles,
protective gloves, conductive footwear).
● Depressurize the pipe.
● Caution: Slacken screws/bolts only when the system has been de-
energized, the pipe depressurized and free of uid product.
● Drain the pipes.
● Remove the device from the pipeline in the reverse order as described in
sect. 5.2 .
● Detach the dial gauge with magnet casing from the neck of the device by
removing the four M8 screws (Item 9 or 15).
● Unscrew the fastening screws (Item 17) between spindle and ap
(Item 18).
● Pull the spindle together with the magnet casing and the spring assembly
(Item 13) out of the device.
● Clean all mechanical parts with appropriate cleaning agents. If
necessary, clean the indicator part with a damp cloth that has been
rinsed in soap suds and wrung out. Reassemble in the reverse order,
paying special attention to the position of the ap.
● The bearing marked with a centre punch must point towards the spring.
For Item numbers, refer to drawings in sect. 10.1

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KFS
Flap-type flow meters
Do not change the original orientation of the ap (maintaining the
direction of rotation appropriate to the indicator part ). The ap
requires a minimum of
1 mm clearance on both sides (risk of jamming and sparking).
Hazardous areas: Do not on any account remove the labelling on the
scale casing containing information on explosion protection.
Before switching on the supply voltage again, make sure that all
parts are completely dry and have been connected up in accordance
with regulations. Protect the devices from excessive dirt and extreme
variations in ambient temperature.
In connection with all maintenance, assembly and repair work of
the ow meters, make absolutely sure that a potentially explosive
atmosphere cannot occur.

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5.4.1 Compliance with IP protection - KFS with standard indicator part
When carrying out assembly work on the indicators (KFS, KFS-IK1,
KFS-IK2, KFS-IKS1, KFS-IKS2, KFS-RK1, KFS-RK2), and to comply
with the IP degree of protection, you should wear rubber gloves or
similar expedient in order to obtain a maximum torque when
tightening the bayonet joint. (Optional installation aid, see sec. 10.3)
5.4.2 Setting the reference point - KFS with standard indicator part
If, when ow is switched off, the pointer in the indicator part should not be
located at the reference point, correct the reference point setting. Make all
adjustments only after the ow has been switched off.
You will need the following tools: open-jawed spanner, jaw span 7mm,
screwdriver 4x 0.6 mm.
● Detach the bayonet ring (Item 1) from the gauge casing and remove it
together with the seal (Item 3) and perspex disc (Item 2).
● Lock the pointer spindle using the 7 mm open-jawed spanner, unscrew
the fastening screw (Item 4) and reset the pointer to the reference point.
● Reassemble the indicator in reverse order.
5.4.3 Replacement of scale - KFS with standard indicator part
You will need the following tools: open-jawed spanner, jaw span 7 mm,
screwdriver 4x 0.6 mm, socket spanner, span 5.5 mm; if necessary, 1 spring
washer (Item 5).
● Detach the bayonet ring (Item 1) from the pressure gauge casing and
remove it together with the seal (Item 3) and the perspex disc (Item 2).
● Lock the pointer spindle using the 7 mm open-jawed spanner, and
unscrew the fastening screw (Item 4) and the spring washer (Item 5).
● Remove the pointer (Item 6).
● Unscrew the three cap nuts (Item 7) and remove the scale (Item 12) from
the casing.
● To t the new scale, proceed in the reverse order.
For Item numbers, refer to drawings in sect. 10.1

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KFS
Flap-type flow meters
5.4.4 Setting the pointer reference point - KFS-EM
Tools needed: 1x at-tip screwdriver
● Loosen the housing cover by turning it counter-clockwise and than
remove it.
● With the at-tip screwdriver, hold the pointer spindle in the resting
position of the indicator part use your other hand to move the pointer
against the frictional force of the pointer-fastening to the point on the
scale marked "Rp".
● Put back on the housing cover and fasten it in a clockwise direction.
(See sec. 5.4.1).
5.4.5 Replacement of scale - KFS-EM
● Loosen the housing cover by turning it counter-clockwise and than
remove it.
● The scale is located in two slots in the surrounding casing. Pull the scale
sideways out of these slots in the direction of the pointer.
● Insert the new scale.
● Put back on the housing cover and fasten it in a clockwise direction.
(See sec. 5.4.1).
5.4.6 Removal of the EM-indicator part from the pressurized measuringpoint
Detach the indicator part at the two brackets on the outside of the indicator
casing (see note in sect. 10.2).
For Item numbers, refer to drawings in sect. 10.1

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6 Installation, start-up and maintenance of devices with
electrical add-on equipment
The installation, commissioning and maintenance of the mechanical part, see
sect. 5
Installation and wiring work may only be carried out by qualied electricians.
In hazardous areas the following installation standards must be observed:
EN 60079-14 EN 60079-17
6.1 Preparatory work for installation and maintenance
For connecting the contacts, have ready at-tip and crosshead screwdrivers
as well as tools for stripping the cables and cutting them to size. In line with
the electrical specications of your device, you also need cable material
for the connection. To maintain the IP degree of protection, only cables
with outside diameters of 4.5 mm - 7 mm may be used in connection with
the right-angle plug (sect. 9.6) at the standard indicators with contacts
(KFS-IK1...). The cable specications for the KFS-EM device are given in
sect. 6.3.3 for indicator part EM.
6.2 Devices with standard indicator casing
This includes the following devices: KFS-IK1, KFS-IK1 Ex, KFS-IK2,
KFS-IK2 Ex, KFS-IKS1, KFS-IKS2, KFS-RK1 and KFS-RK2. The idicator part
casing consists of a tall Polycarbonate cover, a bayonet ring, a corresponding
casing and a gasket (note: IP degree of protection! Refer to sect. 5.4.1). Only
the KFS-IK1 Ex and KFS-IK2 Ex devices may be used in hazardous areas.
6.2.1 Cabling of the contacts
● Disconnect the cable from the mains.
● Remove the right-angle plug from the rear panel of the indicator.
● Take the plug out of the connector housing and detach the PG screwed
cable gland elements.
● Slide the individual parts of the PG screwed cable gland and the housing
of the right-angle plug over the cable.
● Strip the insulation from the wires and connect these to the right-angle
plug according to the terminal diagrams in the following sections.
● Remount the right-angle plug in the casing and tighten down the PG
screwed cable gland.
● Re-Connect to mains.

-13-
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KFS
Flap-type flow meters
6.2.2 Setting the switching points
The contact switching points are easy to adjust after removing the perspex
hood. Use a nger to move the setpoint pointer of the switch to the
appropriate point on the scale. Then check the switching point by moving the
pointer beyond the set switching point.
6.2.3 KFS-RK1, KFS-RK2
The series RK signal transmitters are mechanically operating, oating reed
contacts.
We advise using switch protection relays of the MSR series to increase the
switching capacity and reduce the capacitive load. These are available in
various versions in terms of voltage supply, sensor output and number of
outputs.
RK1 Version with one switch
RK2 Version with two switches
Switch Reed switch, oating
Switching function NC or NO
Switching performance bistable
Proof voltage max. 140 V AC/200 V DC
Switching voltage 50 V AC/75 V DC
Current switched max. 0,25 A
Switch rating max. 5 VA/3 W
Ambient temperature -25 ... +105 °C
Above 50 V AC / 75 V DC, contacts are subject to the EU Low Voltage
Directive. The user has to verify their use.
Terminal assignment
Contact RK-1
Terminal assignment
Contact RK-2
Terminal assignment
at right angle plug
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6.2.4 KFS-IK1 , KFS-IK2
Series IK built-in electrical signal transmitters are non-contacting, inductive
make and break contacts which operate when a control vane moved by the
setpoint pointer dips into and out of the slot initiator. The change in signal is
used for driving a control device via an isolation switching amplier.
IK1 Version with one inductive limit switch
IK2 Version with two inductive limit switches
Switch data
Function Inductive slot initiator acc. to
NAMUR DIN 19233, two-wire
Switching function NC or NO
Slot width 2,0 mm
Hysteresis 1,0 % v. E ... 10 % v.E
Repeat accuracy ≤ 2,0 %
Temperature drift ≤ ± 10 %
Ambient temperature -25 ... +70° C
Voltage nom. 8,2 V DC
Switching frequency ≤ 2,5 kHz
Switching performance bistable
Nominal Voltage 8 V DC via isolation switching amplier
Power consumption
Active area uncovered ≥ 2,1 mA
Active area covered ≤ 1,2 mA
Ambient temperature -25 ... +70 °C
Polarity reversal protection yes
Certication to KEMA 01 ATEX 1264X
Inner inductance (Li) /
capacitance (Ci)
266 µH/41 nF
* Values for pre-assembled cables up to 10 m
Labelling of slot initiator
II 1 G Ex ia IIC T6 Ga/
II 1 D Ex ia IIIC T95 °C Da
(max. Ui = 20 V, Ii = 60 mA, Pi = 130 mW)

-15-
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KFS
Flap-type flow meters
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Terminal assignment
Contact IK-1
Terminal assignment
Contact IK-2
Terminal assignment
at right angle plug

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6.2.5 KFS-IK1 with ATEX approval
The Operator is required, as a matter of principle, to take note of the details
given in the type examination certicate (TÜV 15 ATEX 7805 X). The contact
IK Ex operates on the same principle as the above-mentioned in sect. 6.2.4.
Devices with this contact satisfy the requirements of Directive 2014/34/
EU (ATEX) and are permitted to be operated in Zone 1 hazardous areas,
provided they are fed from a certied and matched intrinsically safe circuit.
The allowable electrical connection data and maximum allowable ambient
temperatures for operation in hazardous areas are contained in the EU-type
examination certicates for Category 2G Ex ia IIC T6...T1 Gb.
For use in hazardous areas, the following measures must be taken:
The indicator part must be grounded. This can be done, e.g. by using a
wire jumper between the ange on the indicator part and a pipe ange on
the main pipeline with cable lugs appropriate for the bolted connection (not
included with the ow meter!).
Use isolation switching ampliers with appropriate type test certicates to
ATEX. Suitable switching ampliers are:
● KFA6-SR2-Ex1.W, supply power 230 VAC
● KFA5-SR2-Ex1.W, supply power 115 VAC
● KFD2-SR2-Ex1.W, supply power 24 VDC
The bolted connections of the anges between indicator part and ap must
feature tooth lock washers on both sides. These are already mounted on
delivery.
The devices approved for hazardous duty feature a blue PG screwed gland
at the right-angle plug for the indicator part, with integrated strain relief
device.
In addition, a sticker is located on the indicator with information on how to
avoid electrostatic charges.
Please note the information from the "Supplementary Installation and
Operating Instructions - Flap-type ow meter KFS ... Ex".
Allowable media temperatures:
-20°C ... +70°C without additional insulation measures
-70°C .... +200°C when Operator has insulated measuring part
and pipe to prevent heat up of indicator part and
el. components

-17-
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A. Kirchner & Tochter GmbH
Fon: [phone] · Fax: [phone]
KFS
Flap-type flow meters
6.2.6 KFS-IKS1, KFS-IKS2
Built-in electrical signal transmitters of the IKS series are non-contacting
make and break contacts which operate when a control vane actuated by the
setpoint pointer dips into and out of the slot initiator. The signal change can
be processed directly in a PLC system.
IKS1 version with one switch
IKS2 version with two switches
Switch inductive slot initiator
Switching function NC or NO
Switching performance bistable
Supply voltage 24 V DC
Current switched IA≤ 100 mA
Open-circuit power consumption ≤ 10 mA
Ambient temperature -25 ... +70° C
Explosion protection no
Voltage drop (at Imax) ≤ 1,2 V
Given PNP-switching devices, the switched output 3 forms a connection to 2
(+) .Between 3 and 1 a load RL must be selected so that the max. current
switched (100 mA) is not exceeded. For two contacts, this applies
analogously to a load RL between 1 and 4 (no direct connection between 1
and 3, or 1 and 4).
Terminal assignment
at right angle plug
EF G H
gg x
$4190
9*+6'
$.7'
$.#%-
EFGH
gg xF
E
$4190
9*+6'
$.7'
$.#%-
E
F
G
Hblue (3) = Limit value switch 1
black (4) = Limit value switch 2
Terminal assignment
Contact IKS-1
Terminal assignment
Contact IKS-2

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Fon: [phone] · Fax: [phone]
-18-
6.3 The indicator part M40
6.3.1 Versions
KFS-M40 local mechanical indicator
KFS-M40-IK1 with one inductive limit value switch
KFS-M40-IK2 with two inductive limit value switches
KFS-M40-IKS1 with one electronic limit value switch
KFS-M40-IKS2 with two electronic limit value switches
KFS-EM with 4 ... 20 mA output
KFS-EM-IK1 with 4 ... 20 mA output & one inductive limit value switch
KFS-EM-IK2 with 4 ... 20 mA output & two inductive limit value switches
KFS-EM-IKS1 with 4 ... 20 mA output & one electronic limit value switch
KFS-EM-IKS2 with 4 ... 20 mA output & two electronic limit value switches
KFS-EMZ with 4 ... 20 mA output, totalizer & LC-Display
KFS-M40-IK1 Ex with one inductive limit value switch, explosion-proof design
KFS-M40-IK2 Ex with two inductive limit value switches, explosion-proof design
KFS-EM Ex with 4 ... 20 mA output, explosion-proof design
KFS-EM-IK1 Ex with 4 ... 20 mA output & one inductive limit value switch,
explosion-proof design
KFS-EM-IK2 Ex with 4 ... 20 mA output & two inductive limit value switches,
explosion-proof design
KFS-EMZ Ex with 4 ... 20 mA output, totalizer & LC-Display, explosion-proof design
Note: For use in hazardous areas, please refer to the
"Supplementary Installation and Operating Instructions - Flap-type
ow meter KFS ... Ex“.
6.3.2 Electrical signal output KFS-EM
The M40 indicator part of the KFS-EM with the ESK4 module supplies a
current of 4 ... 20 mA in two-wire connection that is proportional to the current
ow rate. Transmission is force-free and hysteresis-free. The ESK4 has
been factory-calibrated relative to the ow measuring range. The calibration
values, used for linearization of the indicator, are stored in a memory
chip (EEPROM). In such cases a protected extra-low voltage (PELV) is
recommended.
All instruments connected to the measuring circuit (indicators, recorders)
are connected in series and together may not exceed the maximum external
resistance (see data pertaining to electrical signal output). The ESK4 has
polarity reversal protection.

-19-
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A. Kirchner & Tochter GmbH
Fon: [phone] · Fax: [phone]
KFS
Flap-type flow meters
6.3.3 Compliance with IP-degree of protection
The measuring device meets all requirements of protection category IP66/68.
Therefore it is essential to observe the following points:
● Use only original gaskets. They must be clean and free of any damage.
Defective gaskets must be replaced.
● The electrical cables must be undamaged and must comply with
regulations.
● The cables must be laid with a loop  upstream of the measuring device
to prevent water from getting into the housing.
● The cable feedthroughs  must be tightened.
● Close the unused cable feedthroughs using blanking plugs .
● Do not kink lines at the cable gland.
● The supplied cables may not be mechanically stressed.
 Use blanking plugs if no
cable is routed through
 Tighten cable feedthrough
rmly
 Lay the cable in a loop
Thread Material Cable diameter Protection Comment
M 20x1,5 PA 8 - 13 mm IP 68 - 5 bar Standard
M 20x1,5 brass, nickel plated 10 - 14 mm IP 68 - 10 bar
Please note that the cable glands must at least have a degree of protection
of IP68!

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Fon: [phone] · Fax: [phone]
-20-
6.4 Electrical connection KFS-EM
The plug-in type connection terminals of the ESK4 module in the M40
indicator part can be removed to connect the cables.
Terminal connection pluggable; < 2,5 mm²
Type of connection 2 wire current sink - polarity reversal protection only
for connection to extra-low voltage according to
SELV or PELV
 Current output ESK4 /ESK4A
 Power supply 14...30 VDC
 Measuring signal 4...20 mA
 External load, HART® communication
Power supply M40 with galvanic isolation
Wiring must be planned with great care when it comes to connecting other
devices such as evaluation units or process control. Internal connections in
these devices (e.g. GND with PE, mass loops) may lead to non-permitted
voltage potentials which could negatively affect the function of the converter
itself or that of a device connected to it. In such cases a protected extra-low
voltage (PELV) is recommended.