FISCHER NK105 User manual

Operating manual
NK10 ... H
Fill Level Limiter
for use in explosive areas
Gas explosion protection Zone 1 and 2
Dust explosion zone 21 and 22
09005112 BA_EN_NK10_H ST4-C 04/17 *09005112*

| Masthead FISCHER Mess- und Regeltechnik GmbH
2 / 36 BA_EN_NK10_H_ST4-C
Masthead
Manufacturer: FISCHER Mess- und Regeltechnik GmbH
Bielefelderstr. 37a
D-32107 Bad Salzuflen
Telefon: [phone]
Telefax: [phone]
eMail: [email protected]
web: www.fischermesstechnik.de
Technical editorial team: Documentation representative: S. Richter
Technical editor: R.Kleemann
All rights, also those to the translation, reserved. No part of these instructions
may be reproduced or processed, duplicated or distributed using electronic sys-
tems or any other form (print, photocopy, microfilm or another process) without
the written consent of the company FISCHER Mess- und Regeltechnik GmbH,
Bad Salzuflen.
Reproduction for internal use is expressly allowed.
Brand names and procedures are used for information purposes only and do
not take the respective patent situation into account. Great care was taken
when compiling the texts and illustrations; nevertheless, errors cannot be ruled
out. The company FISCHER Mess- und Regeltechnik GmbH will not accept any
legal responsibility or liability for this.
Subject to technical amendments.
© FISCHER Mess- und Regeltechnik 2015
Version history
Rev. ST4-A 01/15 Version 1 (first edition)
Rev. ST4-B 06/16 Version 2 (Correction)
Rev. ST4-C 04/17 Version 4 (Dimensional drawings changed)

FISCHER Mess- und Regeltechnik GmbH Table of Contents
BA_EN_NK10_H_ST4-C iii
Table of Contents
1 Safety guidelines........................................................................................................................................... 4
1.1 General....................................................................................................................................................4
1.2 Personnel Qualification ...........................................................................................................................4
1.3 Risks due to Non-Observance of Safety Instructions..............................................................................4
1.4 Safety Instructions for the Operating Company and the Operator ..........................................................4
1.5 Unauthorised Modification.......................................................................................................................5
1.6 Inadmissible Modes of Operation............................................................................................................5
1.7 Safe working practices for maintenance and installation work................................................................5
1.8 Pictogram explanation.............................................................................................................................5
2 Product and functional description............................................................................................................. 6
2.1 Delivery scope.........................................................................................................................................6
2.2 Explosion hazard area classification .......................................................................................................6
2.3 Function diagram.....................................................................................................................................6
2.4 Design and mode of operation ................................................................................................................7
3 Installation and assembly ............................................................................................................................ 8
3.1 Safety guidelines .....................................................................................................................................8
3.2 Valid range ..............................................................................................................................................8
3.3 Process connection .................................................................................................................................8
3.4 Electrical connections..............................................................................................................................9
4 Commissioning ........................................................................................................................................... 11
4.1 Safety guidelines ...................................................................................................................................11
4.2 Generalities ...........................................................................................................................................11
4.3 Function test..........................................................................................................................................11
5 Servicing ...................................................................................................................................................... 12
5.1 Maintenance..........................................................................................................................................12
5.2 Transport ...............................................................................................................................................12
5.3 Service ..................................................................................................................................................12
5.4 Disposal.................................................................................................................................................12
6 Technical data ............................................................................................................................................. 13
6.1 General..................................................................................................................................................13
6.2 Application conditions............................................................................................................................13
6.3 Switch contacts .....................................................................................................................................14
6.4 Measurement accuracy .........................................................................................................................14
6.5 Directives and certificates .....................................................................................................................14
6.6 Construction design...............................................................................................................................14
7 Order Codes ................................................................................................................................................ 20
8 Attachments ................................................................................................................................................ 21
8.1 Declaration of Conformity......................................................................................................................21
8.2 Type testing certificates.........................................................................................................................23
8.3 DIN CERTCO Certification DIN 4754-3.................................................................................................31
8.4 EAC Declaration....................................................................................................................................33

1 | Safety guidelines FISCHER Mess- und Regeltechnik GmbH
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1 Safety guidelines
1.1 General
WARNING This operating manual contains instructions fundamental to the installation, op-
eration and maintenance of the device that must be observed unconditionally. It
must be read by the assembler, operator and the specialized personnel in
charge of the instrument before it is installed and put into operation.
This operating manual is an integral part of the product and therefore needs to
be kept close to the instrument in a place that is accessible at all times to the
responsible personnel.
The following sections, in particular instructions about the assembly, commis-
sioning and maintenance, contain important information, non-observance of
which could pose a threat to humans, animals, the environment and property.
The instrument described in these operating instructions is designed and manu-
factured in line with the state of the art and good engineering practice.
1.2 Personnel Qualification
The instrument may only be installed and commissioned by specialized person-
nel familiar with the installation, commissioning and operation of this product.
Specialized personnel are persons who can assess the work they have been
assigned and recognize potential dangers by virtue of their specialized training,
their skills and experience and their knowledge of the pertinent standards.
WARNING For explosion-proof models the specialized personnel must have received spe-
cial training or instruction or be authorized to work with explosion-proof instru-
ments in explosion hazard areas.
1.3 Risks due to Non-Observance of Safety Instructions
Non-observance of these safety instructions, the intended use of the device or
the limit values given in the technical specifications can be hazardous or cause
harm to persons, the environment or the plant itself.
The supplier of the equipment will not be liable for damage claims if this should
happen.
1.4 Safety Instructions for the Operating Company and the Operator
The safety instructions governing correct operation of theinstrument must be
observed. The operating company must make them available to the installation,
maintenance, inspection and operating personnel.
Dangers arising from electrical components, energy discharged by the medium,
escaping medium and incorrect installation of the device must be eliminated.
See the information in the applicable national and international regulations.
Please observe the information about certification and approvals in the Tech-
nical Data section.
The instrument must be decommissioned and secured against inadvertent re-
operationif a situation arises in which it must be assumed that safe operation is
no longer possible. Reasons for this assumption could be:
▪ evident damage to the instrument
▪ failure of the electrical circuits
▪ longer storage outside the approved temperature range.
▪ considerable strain due to transport

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Repairs may be carried out by the manufacturer only.
A professional single conformity inspection as per DIN EN 61010, section 1,
must be carried out before the instrument can be re-commissioned. This in-
spection must be performed at the manufacturer's location. Correct transport
and storage of the instrument are required.
1.5 Unauthorised Modification
Modifications of or other technical alterations to the instrument by the customer
are not permitted. This also applies to replacement parts. Only the manufac-
turer is authorised to make any modifications or changes.
1.6 Inadmissible Modes of Operation
The operational safety of this instrument can only be guaranteed if it is used as
intended. The instrument model must be suitable for the medium used in the
system. The limit values given in the technical data may not be exceeded.
The manufacturer is not liable for damage resulting from improper or incorrect
use.
1.7 Safe working practices for maintenance and installation work
The safety instructions given in this operating manual, any nationally applicable
regulations on accident prevention and any of the operating company's internal
work, operating and safety guidelines must be observed.
The operating company is responsible for ensuring that all required mainten-
ance, inspection and installation work is carried out by qualified specialized per-
sonnel.
1.8 Pictogram explanation
DANGER Type and source of danger
This indicates a direct dangerous situation that could lead to death or serious
injury (highest danger level).
a) Avoid danger by observing the valid safety regulations.
WARNING Type and source of danger
This indicates a potentially dangerous situation that could lead to death or ser-
ious injury (medium danger level).
a) Avoid danger by observing the valid safety regulations.
CAUTION Type and source of danger
This indicates a potentially dangerous situation that could lead to slight or seri-
ous injury, damage or environmental pollution (low danger level).
a) Avoid danger by observing the valid safety regulations.
NOTICE Note / advice
This indicates useful information of advice for efficient and smooth operation.

2 | Product and functional description FISCHER Mess- und Regeltechnik GmbH
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2 Product and functional description
2.1 Delivery scope
▪ NK10 according to specification (see order code)
▪ Operating Instructions
2.2 Explosion hazard area classification
The fill level limiter NK10 … H can be used in areas at risk of explosion from
flammable gases or vapours Zone 1 and Zone 2.
The identification as per Directive 94/9/EC is:
II 2 G Ex ib c IIC T6 Gb
The fill level limiter NK10 … H can be used in areas at risk of explosion from
flammable dust Zone 21 and Zone22.
The identification as per Directive 94/9/EC is:
II 2 D Ex tb c IIIC T80 °C Db
WARNING Installation regulations
The respective installation instructions must be observed for every application
case.
2.3 Function diagram
1
2 3
6
4
9
8 7
10
approx. 10 mm
approx. 60 mm
5
Illustration1: Function diagram
1 Swimmer 2 Swimmer rod
3 Metal bellows 4 Test button
5 Switch lever 6 Micro-switch S1
7 Cable screw connection 8 Flange and counter-flange
9 Welding socket 10 Tank

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2.4 Design and mode of operation
The swim system of the fill level limiter is contained in the fluid-filled reservoir
(expansion tank). The swimming motions generated by changes in the fill level
are transmitted directly to the micro-switch S1 by a swimmer rod sealed in a
stainless-steel bellows. The fulcrum of the swimmer rod is located outside of
the pressure chamber.
There is also a test button outside the pressure chamber with which a function
check as per DIN 4754-3 can be run without lowering the fill level. When
pressed, the body of the swimmer is moved against its buoyancy.
The factory default switching point of micro-switch S1 is set so that it switches
when the swimmer rod is horizontal. The optional warning switch S2 switches
approx. 2.5 mm before S1.
The fill level height at which switching is triggered depends on the density of the
heat carrier. The lowest density at which a secure function is guaranteed is 0.6
kg/dm³.
When the medium has a density of 1.0 kg/dm³, the switching level is approx.
60mm below the middle of the flange or socket.

3 | Installation and assembly FISCHER Mess- und Regeltechnik GmbH
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3 Installation and assembly
3.1 Safety guidelines
WARNING Non-observance of the following safety instructions
Non-observance of the following safety instructions can lead to a dangerous
situation, fatal injuries, series bodily harm or damage.
a) Avoid all risks by observing the following safety instructions.
DANGER!Falling objects
The operator must ensure that any falling objects cannot collide with the in-
stalled unit.
Steps must be taken to prevent
1. sparks being generated on impact.
2. the protection class of the casing is no longer guaranteed.
This can be realised by attaching protective covers, casings etc.
DANGER!Installation regulations
During installation and assembly, the application of specific installation regula-
tions in the respective permits must be observed (1) .
3.2 Valid range
0.8 to 1.1 bar abs
-20°C to 60°C
The EC type test is based on atmospheric conditions of 0.8 to 1.1 bar abs and
ambient or medium temperatures of -20°C to 60°C. If the pressure and temper-
ature levels differ, the operator needs to document the suitability in the explo-
sion protection document.
3.3 Process connection
The process connection may be realised by authorized and qualified special-
ized personnel.
The unit is set ex-works for horizontal installation. Only this installation position
is allowed.
Dangers caused by pressure on the instrument are to be prevented with suit-
able measures.
The flange and/or process connections are designed for a working temperature
of max. 400 °C and a working pressure of max. 20 bar.
CAUTION The data of the flange used may be lower.
Please check the actual data in the technical data section.
There are a range of flanges and welded hexagon nipples with which the device
can be installed on-site. Take care that the side of the device marked TOP
faces upwards when being installed.
NOTICE!Please check:
▪ The swimmer must be able to move freely in the vertical direction!
▪ Test the switching function using the test button.
(1) see Attachment

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3.4 Electrical connections
▪ By authorized and qualified specialized personnel only.
▪ When connecting the unit, the national and international electro-technical
regulations must be observed.
▪ Disconnect the system from the mains, before electrically connecting the
device.
▪ Install the consumer-adapted fuses.
▪ Do not connect the connector if strained.
The instrument may only be installed and commissioned by specialized person-
nel familiar with the installation, commissioning and operation of this product.
Specialized personnel are persons who can assess the work they have been
assigned and recognize potential dangers by virtue of their specialized training,
their skills and experience and their knowledge of the pertinent standards.
For explosion-proof models, the specialized personnel must have received spe-
cial training or instruction or be authorized to work with explosion-proof instru-
ments in explosive areas.
The installed cables and wires must be tested with a reduced tensile force
(25%) in compliance with Section A.3.1 of the standard EN 60079-0 and may
only be used for permanent installation of operating equipment of Group II. The
operator must ensure that the cables are connected with clamps accordingly.
When laying the electrical supply lines, ensure that no short circuit between the
electrical conductors and the surroundings can occur.
A locking and unlocking system as per DIN 4754-3 must be incorporated, if the
device is used as a fill level limiter. This safety system must conform to DIN
50156 / VDDE 0116.
3.4.1 Intrinsically safe power circuits
For use in areas at risk of explosion, instruments must be connected to certi-
fied, intrinsically safe electricity circuits. The following are the limit values with
which the operating equipment can be operated. Compare these to the informa-
tion in the attached EC type testing certificate.
Contact power circuit In ignition protection type intrinsic safety EEx ib
IIC
Max. voltage Ui = 30V
Max. current Ii = 160 mA
Max. output Pi = 800 mW
The effective inner inductances and capacitances
are negligible.
The intrinsically safe power circuits are safely galvanically separated from each
other.
Recommend circuit breakers:
These separation switch devices are available as accessories.
Type Description Operating
voltage
MTL 5011 B 1-channel for contact 20 … 35 V DC
MTL 5015 2-channels for contact 20 … 35 V DC
KFA6-SR2-Ex1.WKFA6-SR2-Ex1.W 1-channel for contact 230 V AC
KFA6-SR2-Ex1.WKFA6-SR2-Ex1.W 2-channels for contact 230 V AC

3 | Installation and assembly FISCHER Mess- und Regeltechnik GmbH
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123
Test button
123 456
1 Switch
(S1)
2 Switch
(S1 with warn switch S2)
PE PE PE
Illustration2: Circuit diagram
Ground connection
Illustration3: Ground connection
Connect the device to the earth to equalise the potential. The outer earth con-
nection is designed for 6.0 mm2 single-wire and 4.0 mm2 fine-wire conductors.
The potential must be equalised in every application case.

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4 Commissioning
4.1 Safety guidelines
WARNING Faulty device
The instrument must be decommissioned and secured against inadvertent re-
operationif a situation arises in which it must be assumed that safe operation is
no longer possible.
üReasons for this assumption could be:
a) Visible damage to the device.
b) Failure of the electrical function.
c) Long storage at temperatures over 85°C.
d) Considerable strain due to transport.
ðRepairs may be carried out by the manufacturer only. A professional single
conformity inspection as per DIN EN 61010, Part 1, must be carried out be-
fore the instrument can be re-commissioned. This inspection must be per-
formed at the manufacturer's location. Correct transport and storage of the in-
strument are required.
4.2 Generalities
All electrical supply, operating and measuring lines and the pressure connec-
tions must have been correctly installed before starting operation and the flange
connections must have been correctly made. All supply lines are arranged so
that there are no mechanical forces acting on the device.
NOTICE!Leak test
The leak tightness of the flange connection must be tested in the course of the
system leak tests.
4.3 Function test
There is a test button outside the pressure chamber with which a function check
as per DIN 4754-3 can be made without lowering the fill level. When pressed,
the body of the swimmer is moved against its buoyancy.
The factory default switching point of switch S1 (clamps 1, 2, 3) is set so that it
switches when the swimmer rod is horizontal. The optional warning switch S2
switches ca. 2.5 mm before S1.
Check the function of the unit:
▪ Check the switching function (with the aid of the test button) in combination
with the following components.
▪ Check the swimmer via the buoyancy behaviour after pressing the test but-
ton.
If the result of the function test is negative, the fill level limiter must be taken out
of operation and the process must be kept safe by other means.

5 | Servicing FISCHER Mess- und Regeltechnik GmbH
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5 Servicing
5.1 Maintenance
WARNING Dust deposits
The device must be cleaned with a damp cloth a regular intervals to prevent
heat build-up. Cleaning intervals depend on the amount of local dust.
Trapped heat can cause the maximum allowed surface temperature (T80°C) to
be exceeded.
CAUTION!Observe the system safety and operating regulations.
The instrument is maintenance-free. We recommend the following regular in-
spection to guarantee reliable operation and a long service life:
▪ Check the switching function (with the aid of the test button) in combination
with the following components.
▪ Check the seal tightness of the flange connection.
▪ Check the electrical connections (cable clamp connection).
The exact test cycles need to be adapted to the operating and environmental
conditions. If several components of the unit interact, all operating instructions
of the other units also need to be observed.
5.2 Transport
The measuring device must be protected against impacts. It should be trans-
ported in the original packaging or a suitable transport container.
5.3 Service
All defective or faulty devices should be sent directly to our repair department.
Please coordinate all shipments with our sales department.
WARNING Process media residues
Process media residues in and ondismantled devices can be a hazard to
people, animals and the environment. Take adequate preventive measures. If
required, the devices must be cleaned thoroughly.
Return the device in the original packaging or a suitable transport container.
5.4 Disposal
WARNING Incorrect disposal may pose a risk to the environment.
Please help to protect the environment by always disposing of the work pieces
and packaging materials in compliance with the valid national waste and recyc-
ling guidelines or reuse them.

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6 Technical data
6.1 General
Please also observe the order code here.
6.2 Application conditions
0.8 to 1.1 bar abs
-20°C to 60°C
The EC type test is based on atmospheric conditions of 0.8 to 1.1 bar abs and
ambient or medium temperatures of -20°C to 60°C. If the pressure and temper-
ature levels differ, the operator needs to document the suitability in the explo-
sion protection document.
Ambient temperature -20 … +60 °C
Storage temperature -20 … +85 °C
Atmospheric conditions 0.8 … 1.1 bar abs
Max. allowed temperature of medium Depends on model and zone
Min. temperature of medium -20 °C
Specific minimum density of medium ρ = 0.6 kg/dm3
Installation position horizontal
Type of protection: IP 65 acc. to DIN EN 60529
Zone 1 and 2 Max. allowed temperature of medium max. occurring surface temperature
The max. occurring surface temperature corresponds to the medium temperat-
ure. Temperature classes acc. to DIN EN 60079-14 and ignition temperatures
need to be taken into account for the respective application. In order to avoid
additional heating, the devices may not be exposed to additional direct sunlight
during operation.
Temperature class T1 T2 T3 T4 T5 T6
Max. surface temper-
ature
450 °C 300 °C 200 °C 135 °C 100 °C 85 °C
Zone 21 and 22 Max. allowed temperature of medium T80 °C
If the medium temperatures exceed 80 °C, the operator must examine the igni-
tion temperatures of the relevant dusts.
Series Version Max. working pressure: Max. temperature of medium
NK10 1 … 20 bar 400°C
NK10 2 … 20 bar 400°C
NK10 3 … 10 bar 350°C
NK10 4 … 16 bar 400°C
NK10 5 … 16 bar 400°C
NK10 6 … 20 bar 400°C
NK10 7 … 20 bar 400°C
NK10 A … 10 bar 350°C
NK10 B … 20 bar 400°C
NK10 F … 20 bar 400°C
NK10 G … 20 bar 400°C
NK10 H … 20 bar 400°C
NK10 K … 150 lbs 400°C
NK10 M … 300 lbs 400°C
NK10 N … 300 lbs 400°C
NK10 P … 300 lbs 400°C

6 | Technical data FISCHER Mess- und Regeltechnik GmbH
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6.3 Switch contacts
1 or 2 micro-switches with 1-pin changeover contact.
WARNING Only for connection to certified intrinsically safe circuits in the igni-
tion protection class Ex ib IIC.
Highest values per electricity circuit:
Ui = 30 V
Ii = 160 mA
Pi = 800 mW
The intrinsically safe contact circuits are safely galvanically separated from
each other and the earth potential.
6.4 Measurement accuracy
Switch hysteresis approx. 6 mm
Switching point differential between S1 and S2 (+) max. 30 mm
Switching point differential on the
medium surface
dependent on medium
density
(+) only for two micro-switches
6.5 Directives and certificates
Directives Applicable standards
ATEX Guideline 2014/34/EU DIN EN 60079-0:2013-04
DIN EN 60079-11:2012-06
DIN EN 60079-31:2010-07
DIN EN 13463-1:2009-07
DIN EN 13463-5:2011-10
Pressurised Vessel Directive 2014/68/
EU
DIN EN 13445-1:2013-12
DIN 4754-3:2015-03
Low-Voltage Directive 2014/35/EU DIN EN 61010-1:2011-07
Testing Certificate no.
EC type testing 97/23/EC Module B Cert. no. 07 202 1081 Z 9143/13/H
Module D Cert. no. 07/202/1081/Z/0150/D/15
EC type testing 94/9/EC Cert. no. TÜV 07 ATEX 553595
GL type testing Cert. no. 65 353 – 93 HH
DIN CERTCO acc. to 4754-3 Cert. no. 10F001
6.6 Construction design
Swimmer system Stainless steel 1.4571
Metal bellows Stainless steel 1.4571
Flange / counter-flange (*) Stainless steel 1.0425 (P265GH) or 1.4571
Welding socket St.35.8 [1.0345 (P235GH)]
Screws / nuts (x) G 7258 / C35PbK
(*) Please note the material information in the dimensional drawings.
(x) Only for version with welding connection

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6.6.1 Dimensional drawings
All dimensions in mm unless otherwise stated
6.6.1.1 Version with welding connection
Version Flange
material
ABC
[Ø]
D
[square]
E
NK104 1.0425 P265GH 220 365 82.5 77.8 x 77.8 105
NK105 1.0425 P265GH 250 395 88.9 90.0 x 90.0 103
A
B
125
D
C
Ø72
E
Illustration4: Dimensional picture NK104 NK105

6 | Technical data FISCHER Mess- und Regeltechnik GmbH
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6.6.1.2 Flange DIN EN 1092-1 Type B1
Version Flange
material
Port D
[Ø]
LK
[Ø]
B b d
[Ø]
No. of
holes
NK102 1.0425 P265GH DN80 PN40 200 160 24 22 18 8
NK10G 1.4571 --- DN80 PN40 200 160 24 22 18 8
209
359
125
B
b
d
D
LK
Ø72
Illustration5: Dimensional picture NK102 NK10G
Version Flange
material
Port A D
[Ø]
LK
[Ø]
B b d
[Ø]
No. of
holes
NK101 1.0425 P265GH DN65 PN40 230 185 145 22 20 18 8
NK103 1.0425 P265GH DN65 PN16 234 185 145 18 16 18 4
NK107 1.4571 --- DN65 PN40 230 185 145 22 20 18 8
379
125
B
b
d
D
LK
Ø62
A
Illustration6: Dimensional picture NK101 NK103 NK107

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6.6.1.3 Flange DIN EN 1092-1 Type C
Version Flange
material
Port D
[Ø]
LK
[Ø]
B b d
[Ø]
No. of
holes
NK10F 1.0425 P265GH DN80 PN40 200 160 24 19.5 18 8
209
359
125
Ø72
D
LK
Ø120 Ø106
d
B
b
Illustration7: Dimensional picture NK10F
Version Flange
material
Port A D
[Ø]
LK
[Ø]
B b d
[Ø]
No. of
holes
NK106 1.0425 P265GH DN65 PN40 230 185 145 22 17.5 18 8
NK10A 1.0425 P265GH DN65 PN16 234 185 145 18 13.5 18 4
B
b
379
125
d
D
LK
Ø109 Ø95
Ø62
A
Illustration8: Dimensional picture NK106 NK10A

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6.6.1.4 Flange DIN EN 1092-1 Type G
Version Flange
material
Port D
[Ø]
LK
[Ø]
B b d
[Ø]
No. of
holes
NK10H 1.4571 --- DN80 PN40 200 160 24 22 18 8
B
b
209
359
d
D LK Ø106
125
Ø72
Illustration9: Dimensional picture NK10H
6.6.1.5 Flange DIN EN 1092-1 Type D
Version Flange
material
Port D
[Ø]
LK
[Ø]
B b d
[Ø]
No. of
holes
NK10B 1.0425 P265GH DN65 PN40 185 145 22 20 18 8
230
279
125
B
b
d
D LK Ø110 Ø94
Ø62
4
Illustration10: Dimensional picture NK10B

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6.6.1.6 Flange ANSI B16.5
Version Flange
material
Port A D
[Ø]
LK
[Ø]
B b d
[Ø]
No. of
holes
NK10K 1.0425 P265GH 3‘‘ 150 lbs 209 192.5 152.4 24 22.8 19.1 4
NK10N 1.0425 P265GH 3‘‘ 300 lbs 204 209.5 168.1 28.4 26.8 22.3 8
NK10P 1.0425 P265GH 4‘‘ 300 lbs 201 254 200.1 31.7 30.1 22.3 8
359
B
b
d
125
D LK
Ø72
A
Illustration11: Dimensional picture NK10K NK10N NK10P
Version Flange
material
Port A D
[Ø]
LK
[Ø]
B b d
[Ø]
No. of
holes
NK10M 1.0425 P265GH 2.5‘‘ 300 lbs 227 190.5 149.3 25.4 23.8 22.3 8
B
b
359
d
D LK
125
Ø62
A
Illustration12: Dimensional picture NK10M

7 | Order Codes FISCHER Mess- und Regeltechnik GmbH
20 / 36 BA_EN_NK10_H_ST4-C
7 Order Codes
0 0
Switching Elements
ATEX
N K 1 0
Type
Flange
0 0 0 0 0 0 H0
1 2 5 6 7 8 9 10 11 123 4Code no.
[1] Flange Material
1DIN EN 1092-1 Form B1 DN65 PN40 1.0425 P265GH
2DIN EN 1092-1 Form B1 DN80 PN25 1.0425 P265GH
3DIN EN 1092-1 Form B1 DN65 PN16 1.0425 P265GH
7DIN EN 1092-1 Form B1 DN65 PN40 1.4571 ---
HDIN EN 1092-1 Form B1 DN80 PN40 1.4571 ---
6DIN EN 1092-1 Form C DN65 PN40 1.0425 P265GH
ADIN EN 1092-1 Form C DN65 PN16 1.0425 P265GH
FDIN EN 1092-1 Form C DN80 PN40 1.0425 P265GH
BDIN EN 1092-1 Form D DN65 PN40 1.0425 P265GH
HDIN EN 1092-1 Form G DN80 PN40 1.4571 ---
KANSI B16.5 3‘‘ 150 lbs 1.0425 P265GH
MANSI B16.5 2.5‘‘ 300 lbs 1.0425 P265GH
NANSI B16.5 3‘‘ 300 lbs 1.0425 P265GH
PANSI B16.5 4‘‘ 300 lbs 1.0425 P265GH
4Welding connection 82.5 mm (S80)
5Welding connection 88.9 mm (S90)
[8] Switching Elements
11 micro-switch
22 micro-switches
[12] For use in explosive areas (ATEX)
HGas explosion protection Zone 1 and Zone 2
Dust explosion protection Zone 21 and Zone 22