Kobold SMN-1150 H Series User manual

Operating Instructions
for
All Metal Flow Switch
Model: SMN

SMN
Seite 2 SMN K05/0322
1. Contents
1. Contents ........................................................................................................ 2
2. Note .............................................................................................................. 3
3. Instrument Inspection .................................................................................... 3
4. Regulation Use ............................................................................................. 4
5. Operating Principle ........................................................................................ 4
6. Mechanical Connection ................................................................................. 4
7. Electrical Connection .................................................................................... 5
7.1. with Plug Connection .......................................................................... 5
7.2. Example for Contact Protective Measures ......................................... 5
8. Use in hazardous area .................................................................................. 6
8.1. Statement an apparatus not containing an own
potential ignition source ..................................................................... 6
8.2. ATEX reed contact 41R57** .............................................................. 7
9. Maintenance and Care ................................................................................ 14
10. Technical Information .................................................................................. 14
11. Order Codes ............................................................................................... 16
12. Dimensions ................................................................................................. 16
13. Pressure Loss Diagram ............................................................................... 17
14. EU Declaration of Conformance (SMN) ...................................................... 18
15. EU Declaration of Conformance (Reed contact 41R57**) ........................... 19
16. Statement of conformity reed contact 41R57** ........................................... 20
Manufactured and sold by:
Kobold Messring GmbH
Nordring 22-24
D-65719 Hofheim
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.kobold.com

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SMN K05/0322 Seite 3
2. Note
Please read these operating instructions before unpacking and putting the unit
into operation. Follow the instructions precisely as described herein.
The instruction manuals on our website www.kobold.com are always for currently
manufactured version of our products. Due to technical changes, the instruction
manuals available online may not always correspond to the product version you
have purchased. If you need an instruction manual that corresponds to the
purchased product version, you can request it from us free of charge by email
([email protected]) in PDF format, specifying the relevant invoice number and
serial number. If you wish, the operating instructions can also be sent to you by
post in paper form against an applicable postage fee.
The devices are only to be used, maintained and serviced by persons familiar
with these operating instructions and in accordance with local regulations
applying to Health & Safety and prevention of accidents.
When used in machines, the measuring unit should be used only when the
machines fulfil the EC-machine guidelines.
as per PED 2014/68/EU
In acc. with Article 4 Paragraph (3), "Sound Engineering Practice", of the
PED 2014/68/EU no CE mark.
Table 8, Pipe, Group 1 dangerous fluids
3. Instrument Inspection
Instruments are inspected before shipping and sent out in perfect condition.
Should damage to a device be visible, we recommend a thorough inspection of
the delivery packaging. In case of damage, please inform your parcel service /
forwarding agent immediately, since they are responsible for damages during
transit.
Scope of delivery:
The standard delivery includes:
 All Metal Flow Switch model: SMN

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Seite 4 SMN K05/0322
4. Regulation Use
Model SMN instruments monitor liquid flows. Only clean and homogeneous
liquids of low viscosity - against which the instrument materials are resistant -
should be monitored. Large switch-point inaccuracies can occur with highly
viscous media.
Large dirt particles can block the float and thus cause faulty signals. Pieces of
ferrite, deposited on the float (with embedded magnet) can lead to the same
effect (we recommend magnetic filters).
5. Operating Principle
The KOBOLD model SMN flow switch is used when extremely low flow switch
points are required in combination with minimum pressure loss at high flow rates.
The flow switch operates on the well-known float principle.
An orifice float with an integrated circular magnet moves within a cylindrical flow
tube in the direction of the flow and against a spring.
The magnetic field of the float activates a reed contact which is mounted on the
outside of the instrument in a sliding protective casing. Due to the special
construction of the float and flow tube only a low flow is required to raise the float
and hence to activate the reed contact. If the flow rate increases further and the
float reaches the top of its travel an additional flow path opens allowing high flow
rates without a significant increase in the pressure loss.
6. Mechanical Connection
 Make sure that allowed max. operating pressure and temperature are not
exceeded.
 The instrument can be installed vertically or horizontally in the pipework. Flow
is in the direction of the arrow from bottom to top, from left to right or from right
to left.
 Remove all transport restraints and make sure that none of the packing
material remains in the instrument.
 Use Teflon tape or something similar to seal the threaded connections.
 The instruments should not be installed in an induction field.
 If possible, check after mechanical installation that the threaded joint/pipe
connection is tight and leakproof.

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7. Electrical Connection
7.1. with Plug Connection
 Make sure that the electrical supply lines are powerless.
 Undo the locking screw on the plug cap and remove the cap
from the base.
 Mount supply line in the plug cap as shown in the wiring
diagram.
 The contact is adjusted and should not be modified.
 Insert the plug connector on the contact stem and fix it with
the retaining screw.
Attention! Every single specified electrical value for the sealed
contact should not be exceeded even for short periods. We
recommend contact protection relays or other contact protection
measures for higher switching values.
When the external devices have been connected to the limit contact and the
switching point has been set, the electrical connection is complete. The instrument
can now be put into operation.
7.2. Example for Contact Protective Measures
For capacitive and inductive loads (long conductors and relay/protection) we
recommend the following protective schemes.

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Seite 6 SMN K05/0322
8. Use in hazardous area
8.1. Statement an apparatus not containing an own potential
ignition source

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SMN K05/0322 Seite 7
8.2. ATEX reed contact 41R57**
ATEX N/O contact 41R57
II 3G Ex ic IIC T4 Gc
II 3 D Ex ic IIIC T125 °C Dc
-20 °C ≤Ta≤80 °C
max. 250 VAC/DC/1.5 A/100 W/100 VA
ATEX changeover contact 41R57U
II 3G Ex ic IIC T4 Gc
II 3 D Ex ic IIIC T125 °C Dc
-20 °C ≤Ta≤80 °C
max. 250 VAC/DC/1 A/30 W/60 VA

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Seite 8 SMN K05/0322
Ex-relevant excerpt of the operating instructions of the reed contact
41R57 **
1. Preambel
This excerpt of the operating instructions only represents the ex-relevant aspects.
It is copied into the original operating manual in the same or analogous form;
Textual changes are permitted, the ex-relevant statements remain.
To ensure the function and for your own safety, please read the enclosed
operating instructions carefully before you begin the installation. If you have any
questions, please contact the KOBOLD Messring GmbH, Hofheim. It applies with
the original operating instructions.
The following standard issues were considered in the evaluation of the product:
a) IEC 60079-0:2017 Ed. 7 / EN 60079-0:2018 Explosive atmospheres –
Part 0: Equipment - General requirements
b) IEC 60079-11:2011 Ed. 6 + Corr. 2012 / EN 60079-11:2012 Explosive
atmospheres - Part 11: Equipment protection by intrinsic safety "i"
2. General information on explosion protection
The reed switches work together with various KOBOLD products and serve there
for monitoring. It is available as N/O contact or changeover contact.
The electrical connection is made via a plug - only in intrinsically safe systems.
The reed switch is intended for commercial use and may only be used in
accordance with the specifications in the technical documentation of Kobold and
the information on the nameplate. It is only operated together with certified
products via an intrinsically safe circuit. They comply with the valid standards and
regulations.
The installation regulations (e.g. EN 60079-14) for systems in potentially
explosive atmospheres must be observed.
Further important details can be found in the corresponding EC-type examination
certificate.
Permitted use
• The intrinsically safe reed switch can be used as follows:
• In Zone 2 (Gas-Ex, EPL Gc) in explosion groups IIA, IIB and IIC
• In Zone 22 (Dust-Ex, EPL Dc) in explosion groups IIIA, IIIB and IIIC
• The requirements for simple electrical equipment for use in intrinsically safe
circuits in zones 1/21 are fulfilled.
• The qualification regarding the surface temperature is T4. For all gases, vapors,
mists with an ignition temperature> 135 ° C the equipment is not an ignition
source.
• In the dust Ex area, 125 ° C is the reference temperature for further
consideration regarding the safety distance from the smoldering temperature.
• The ambient temperature range is -20 ° C ≤ Ta ≤ 80 ° C.

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SMN K05/0322 Seite 9
2.1. Electrical characteristics for Ex i
Electrical data:
• Rated voltage up to 45 volt AC / DC
• Rated current up to 2 A
• UiIC ≤ 30 V AC / DC, IiIIC ≤ 250 mA
• UiIIB ≤ 45 V AC / DC, IiIB ≤ 2 A
• UiIIIC ≤ 45 V AC / DC, IiIIIC ≤ 250 mA
• Li = negligible, Ci = negligible
• Heating on the outer housing <15 K
2.2 Type code
The equipment is identified by the following type code:
Type Description Item-No. Remarks
41R57 A B T
y
pe codin
g
41R57 Contact device
A
N/O contact
(
2 wires
)
, Plu
g
with black cap
Change-over contact (3 wires), Plug with grey
cap
B 70
–
75 with markin
g
(
not ex-relevant
)
202.289 N/O
45
–
50 with markin
g
202.285 N/O
50
–
55 with markin
g
202.286 N/O
60 – 65 with marking 202.287 N/O
70
–
75 with markin
g
202.288 Chan
g
e-over
60
–
65 chan
g
e-over contact 202.290 Chan
g
e-over
2.3 Temperature class
The reed switch is suitable for temperature class T4 / T125 ° C.
2.4 General requirements
2.4.1 Intended Use
a) To ensure safe operation, the products may only be used according to the
instructions in the assembly instructions. During use, the legal and safety
regulations required for the respective application must be observed in
addition. This applies analogously when using accessories.
b) Failure to comply with the instructions given in this excerpt or in the case of
improper handling of the product will render our liability null and void. In
addition, the warranty on products and spare parts is void.
c) The products are not safety elements in terms of their intended use.
d) Only original parts of the manufacturer may be used.

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Seite 10 SMN K05/0322
2.4.2 General safety instructions
The reed switch corresponds to the state of the art and is reliable. The reed
switch may pose a residual hazard if improperly used and operated by untrained
personnel.
Every person, responsible for the installation, commissioning, maintenance or
repair of the reed switch, must have read and understood the assembly
instructions and in particular the safety instructions.
a) Follow the general rules of technology for the selection and proper
operation of a product.
b) All connected electrical and mechanical equipment must be suitable for
the respective application.
c) Observe the notes in these operating instructions as well as the
conditions of use and permissible data that appear from the imprints /
nameplates of the respective products.
d) It must be ensured that only product protection types corresponding to
the zones are installed!
e) The product is only approved for proper and intended use in a normal
industrial atmosphere. Immersion in liquids is not permitted.
f) It must be ensured that no falling objects can hit the product.
g) The operator must ensure the lightning protection for the entire system in
accordance with local regulations.
h) It is the responsibility of the installer to ensure that the function of the
reed switch in conjunction with the individual evaluation devices functions
properly and is approved for the intended use.
i) The intrinsically safe connection - including the reed switches - must be
made via approved / tested evaluation devices, which may need to be
equipped with suitable zener barriers or switching amplifiers.
3. Commissioning, installation
Depending on the IP degree of protection, the time for cleaning the equipment
(dust deposits) must be specified. Other important facts:
a) The product may be put into operation in Zone 2 (Cat. 3G, EPL Gc)
or in Zone 22 (Cat. 3D, EPL Dc in intrinsically safe circuits only by
specialists with a qualification similar to a qualified person according
to TRBS 1203.
b) The requirements for simple electrical equipment that apply to the
hazardous area of Zones 1/21 according to EN 60079-11 are
fulfilled.
c) The products may only be used in the usual industrial atmosphere.
In the presence of aggressive substances in the air, the
manufacturer must always be consulted. The products must be
adequately protected in adverse environmental conditions.
d) Operation of the product is only permitted in fully assembled and
undamaged enclosures. In case of possible damage, a zone
carryover may have to be considered by the operator; Moreover,
operation of the housing is not permitted if the housing is damaged.
e) The environmental conditions specified in the operating instructions
must be adhered to and protected against adverse environmental
conditions.