Kobold RFS User manual

Operating Instructions
For
Magnetic level switch
RFS

RFS
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1. Content
1.Content ......................................................................................................... 2
2.Note .............................................................................................................. 3
3.Instrument Inspection .................................................................................... 3
4.Description .................................................................................................... 3
5.Operation ...................................................................................................... 4
6.Use in Hazardous Areas ............................................................................... 4
7.Mechanical Connection ................................................................................. 5
8.Electrical Connection .................................................................................... 6
9.Models .......................................................................................................... 8
10.Technical data ............................................................................................... 9
11.Safety Instructions ( ATEX ) ........................................................................ 11
12.Installation in ATEX areas ........................................................................... 12
13.Electrical connection in ATEX area ............................................................. 13
14.Label description (ATEX) ............................................................................ 13
15.EU Declaration of conformity (ATEX) .......................................................... 14
16.EU Declaration of conformity ...................................................................... 15
17.UK Declaration of conformity ...................................................................... 16
18.ATEX Certified ............................................................................................ 17
19.Notes ........................................................................................................... 17
Manufactured by:
Kobold Mesura S.L.U
Av. Conflent Nº68 Nave 15
08915 Badalona
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Internet: www.kobold.com
Edition: May 2022

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2. Note
Please read these operating instructions before unpacking and putting the unit in
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 correspond 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.
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:
 Magnetic Level switch RFS
 Operating instructions
4. Description
Model RFS devices are used for monitoring liquid levels. The device should only be
used with liquids that are compatible with the unit´s materials of construction.
The standard version can be mounted in a wide range of installations while the ATEX
version is to be mounted in classified installations category 1 requiring certification
1G Ex ia IIC T6, 1D Ex ia IIIC T85ºC Da.

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5. Operation
Working principle is based on the magnetic field of a magnet that activates the reed
contact.
RFS have the magnet located inside the float, the float is balancing following the
liquid level. When magnetic field of the magnet in the float reaches the reed contact
or the micro switch located in the fixed part of the instrument, it switches and
indicates the level of the tank.
The switching function (N/O contact N/C contact) is determined by the mounting
position. The switching function is reserved by simply rotating the switch through
180º.
6. Use in Hazardous Areas
With the approval the Level Switch, model RFS, can be used within hazardous areas.
Thereby the aluminium housing is applicable outside the process in zone of category
1GD.
The approvals are as follows:
II 1 GD Ex ia IIC T6 Ga
Ex ia IIIC T85ºC Da
-20≤Ta≤+60ºC
An additional intrinsically safe relay is required in environment with gas explosion
hazards (KFA...and respectively KFD).
For a correct and professional potential equalization, the ground terminal on the
housing of the RFS must be connected in applications in hazardous areas.

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7. Mechanical Connection
The Level Switch should be mounted so that the float can move freely over its entire
path without hitting the wall, floor or roof of the container. Avoid fitting the switch where
agitators or inlet valves could expose it to excessive turbulence.
Make sure that the medium does not contain solids or ferrite particles, as they could
collect on the float magnet and interfere with the switching operation. If the liquid does
contain sediment or suspended matter, you must be sure they do not come into contact
with the float system.
Mount the switch in a way that is easily accesible for installation and maintenace.
 Do not hit the instrument.
 Do not install the instrument close to magnetic fields to avoid malfunctioning.
 Avoid mechanical vibrations.
 Be sure that the media (liquid) has no solid particles.
 Be sure that the media is chemically compatible with instrument materials.
 Make sure that the allowed max. operational pressure and service temperature for
the device is not exceeded.
 The installation position must be horizontal.
 If possible, examine all the connection joints for proper sealing, just after
mechanical intalation.
 The engraved arrow on the hexagon must point up or down depending on the
desired contact function. In any case the marked hexagon surface must always be
mounted vertically.
Mounting position
Depending on the mounting position of the device, the contact function (N/O or N/C
contact)of the level switch will be defined.

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8. Electrical Connection
Caution! Make sure that voltage of your system
correspond with the voltage values of the level switch
 The switching power of Reed contacts of these magnetic levels is very low,
so they can only be connected to resistive high impedance loads, like PLCs.
 When load is relay, electro valve or other element that requires some power
it is absolutely necessary to protect the Reed contacts as follows depending
on load and voltage types.
 For the RFS version for ATEX applications, the connection of the potential
terminal is mandatory.
 An additional intrisically safe relay is required in environment with gast or dust
explosion hazards (KFA...and respectively KFD).

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Supplementary devices:
1. Contact protection relays
We recommend the use of contact protection relays in conjunction with sealed
contacts.
Contact protection relays have the following advantages:
 No contact overloads arising from sparking and high currents, which can, for ex-
ample, be caused by self-induced e.m.f.`s when switching solenoid valves.
 Float switches are electrically isolated from the high voltage power supply sys-
tem.
 Protection for persons who come into contact with liquids according to VDE
0100.
 Standard models:
 Mod. MSR 10 1 channel, 1 changeover
 Mod. MSR 20 2 channels, 2 changeover
 Mod. MSR 11 2 channels, 1 changeover bistable
 Atex models:
 Mod. KFD2-SR2-Ex1.W 1 channel, 1 relay output, supply 24 V
DC
 Mod. KFA6-SR2-Ex1.W 1 channel, 1 relay output, supply 230 V
AC
 Mod. KFD2-SR2-Ex2.W 2 channel, 2 relay output, supply 24 V
DC
 Mod. KFA6-SR2-Ex2.W 2 channel, 2 relay output, supply 230 V
AC
Pin assigment for RFS Level Switches
RFS-12N4_01200
RFS-12N4_11200 RFS-12N4_00000
RFS-12N4_001__

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9. Models
RFS-12N4__1200 RFS-12G4__1200
RFS-12N4_00000 RFS-12G4_00000
RFS-12N4_00100 / RFS-12N4_001EX RFS-12G4_00100 / RFS-12G4_001EX

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10. Technical data
Note: Kobold Mesura makes every attempt to ensure the accuracy of these
specifications, however, are subject to change without notice.
SERIE RFS
RFS-12N4__1200 | RFS-12G4__1200
Mounting Style: External
Process connection: G½ or ½" NPT
Stem: 1.4301 or 1.4404
Float: Ø17x47 - 1.4404
Medium max. Temp.: -40ºC...+120ºC
Max.pressure: 10 bar
Min. liquid density: >0.8g/cm³
Switching power max: 50W
Switching voltage max: 300Vac / 350Vdc
150Vac / 200Vdc (model with pt100)
Switching current max: DC 0.7 / AC 0.5A
Electrical connection: M12 4 poles
IP degree : IP65
RFS-12N4_00000 | RFS-12G4_00000
Mounting Style: External
Process connection: G½ or ½" NPT
Stem: 1.4301 or 1.4404
Float: Ø17x47 - 1.4404
Medium max. Temp.: -40ºC...+120ºC
Max.pressure: 10 bar
Min. liquid density: >0.8g/cm³
Switching power max: 50W
Switching voltage max: 300Vac / 350Vdc
Switching current max: DC 0.7 / AC 0.5A
Electrical connection: Connector DIN43650 (EN175301-803)
IP degree: IP65

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RFS-12______0100
Mounting Style: External
Process connection: G½ or ½" NPT
Stem: 1.4301 or 1.4404
Float: Ø17x47 - 1.4404
Medium max. Temp.: -40ºC...+120ºC
Max.pressure: 10 bar
Min. liquid density: >0.8g/cm³
Switching power max: 50W
Switching voltage max: 300Vac / 350Vdc
Switching current max: DC 0.7 / AC 0.5A
Electrical connection: Aluminum housing
IP degree: IP65
RFS-12______01EX
Mounting Style: External
Process connection: G½ or ½" NPT
Stem: 1.4301 or 1.4404
Float: Ø17x47 - 1.4404
Medium max. Temp.: -40ºC...+120ºC
Max.pressure: 10 bar
Min. liquid density: >0.8g/cm³
Switching power max: 50W
Switching voltage max: Ui: 40V, Li: negligible, Ci: negligible
Switching current max: DC 0.7 / AC 0.5A
Electrical connection: Aluminium box
IP degree: IP65
ATEX Marking: II 1 GD Ex ia IIC T6 Ga
Ex ia IIIC T85ºC Da
-20≤Ta≤+60ºC

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11. Safety Instructions ( ATEX )
1. Validity
These safety instructions must be applied to the magnetic level switches series
RFS…EX when used in explosive atmospheres.
2. General remarks.
Working principle of RFS…EX is based on the magnetic field of a magnet that acti-
vate reed contact and these instruments are used to control the level of a liquid of any
zone. Including zones with explosion risk.
It can be used in hazardous areas group IIC, category 1 G/D.
The probe can be installed in explosion risk areas category 1 certification 1G/D.
The process connection element and the housing must be installed in category 1 cer-
tification 1G/D Ex ia.
When installing these instruments in explosive areas. All general instructions and rec-
ommendations regarding installations in explosive areas, as well as, the instructions
of this safety manual must be followed.
Verify that all data on the label of the instrument fits the installations requirements.
EN 60079-0:, EN 60079-11, and Directive ATEX 2014/34 must be followed.
Switch off power supply before open the housing or be sure there is no explosion risk.
Verify that housing is closed before switch on the instrument.
It is very important to verify that ground terminal of the instrument is connected to
ground of the installation.
Installation in hazardous areas must be done by specialized personnel.
3. Protection against ESD ( electro static discharges )
Instruments with plastic parts that can produce electro statics discharges, have a
warning label.
It is important to follow some rules to avoid ESD:
 Avoid frictions.
 Do not clean the instruments with a dry cloth.
 Do not install in locations close to pneumatic flow of materials or close to steam
exhaust systems.

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4. Chemical resistance.
Make sure that the instrument materials must be chemically resistants specially
when used in hazardous areas.
12. Installation in ATEX areas
In classified areas, the level switch series RFS ATEX version, can be installed with the
housing in zone 0, 1, 20, 21 (category 1G/D) or in a NON CLASSIFIED area.
Wet part (probe) can be installed in zone 0, 20 (category 1).
Installation must be done with trained personnel on ATEX environments.

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13. Electrical connection in ATEX area
14. Label description (ATEX)

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15. EU Declaration of conformity (ATEX)
DECLARACIÓN DE CONFORMIDAD EU
EU DECLARATION OF CONFORMITY
EG-KONFORMITÄTSERKLÄRUNG
DÉCLARATION DE CONFORMITÉ
DICHIARAZIONE DI CONFORMITÀ CE
KOBOLD MESURA SLU
Avda. Conflent 68 nave 15, 08915 Badalona (España)
Declara, bajo la propia responsabilidad, que el producto
Declares under our sole responsibility, that the product
Erklärt in alleiniger Verantwortung, dass das Produkt
Déclare sous sa seule responsabilité, que le produit
Dichiara sotto la propia responsabilità, che il prodotto
RFS…EX
A los cuales se refiere esta declaración, son conformes a las siguiente Directivas Europeas:
To which this declaration relates is in conformity with the following European Directives:
Mit folgenden Richtilinien konform ist:
À auxquels se réfère cette déclaration, ils sont conformes aux Directives Européennes suivant :
A ai quali si riferisce questa dichiarazione, sono conformi alle direttive europee seguente:
EMC2014/30/EU LVD2014/35/EU ATEX2014/34/EU RoHS2011/65/EU
Normas armonizadas y documentos de la normativa aplicados:
Applied harmonised standards and normative documents:
Angewandte harmonisierte Normen oder normative Dokumente:
Normes harmonisées et documents normatifs appliqués
Norme armonizzate e documenti normativi applicati:
EN61010-1 :2010 EN60079-0:2009 (acc. EN60079-0:2013)
EN61000-6-2 :2019 EN60079-11:2007 (acc. EN60079-11:2013)
Certificado de examen CE de tipo Marcado
EC-type examination certificate Marking
EG-baumusterprübescheinigung Kennzeichnung
Attestation d´examen CE de type Inscription
Certificazione per esame di tipo CE Marcatura
LOM06ATEX2054X
II 1 GD Ex ia IIC T6 / Ex iaD 20 T85
Ta :-20/+60ºC
Fabricado en: KOBOLD MESURA SLU Avda. Conflent 68 nave 15, 08915 Badalona (Spain)
Made in:
Hergesteltlt in:
Fabriqué dans:
Fabbricato in:
Organismo notificado : LOM 0163 Número notificación : LOM 05ATEX9070
Notified organism Number notification
Mitgeteilter Organismus Zahlmitteilung
Organization annoncée Nombre notification
Organismo informato Notifica di numero
Badalona Sept. 2017
Gerente

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16. EU Declaration of conformity
DECLARACIÓN DE CONFORMIDAD EU
EU DECLARATION OF CONFORMITY
EG-KONFOMITÄTSERKLÄRUNG
DÉCLARATION DE CONFORMITÉ
DICHIARAZIONE DI CONFORMITÀ EU
KOBOLD MESURA SLU
Avda. Conflent 68 nave 15, 08915 Badalona (España)
Declara, bajo la propia responsabilidad, que el producto
Declares under our sole responsibility, that the product
Erklärt in alleiniger Verantwortung, daß das produkt
Déclare sous sa seule responsabilité, que le produit
Dichiara sotto la propia responsabilità, che il prodotto
RFS…
A los cuales se refiere esta declaración, son conformes a las siguiente Directivas Europeas:
To which this declaration relates is in conformity with the following European Directives:
An auf das diese Erklärung verweist, sie mit den Europäischen Richtlinien im Einklang stehen folgend:
À auxquels se réfère cette déclaration, ils sont conformes aux Directives Européennes suivant :
A ai quali si riferisce questa dichiarazione, sono conformi alle direttive europee seguente:
EMC2014/30/EU LVD2014/35EU RoHS2011/65/EU
Normas armonizadas y documentos de la normativa aplicados:
Applied harmonised standards and normative documents:
Angewandte harmonisierte Normen oder normativer Dokumente:
Normes harmonisées et documents normatifs appliqués
Norme armonizzate e documenti normativi applicati:
EN61010-1 :2010
EN61000-6-2 :2019
Fabricado en: KOBOLD MESURA SLU Avda. Conflent 68 nave 15, 08915 Badalona (Spain)
Made in:
Hergesteltlt in:
Fabriqué dans:
Fabbricato in:
Badalona Sept. 2017
Gerente

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17. UK Declaration of conformity
DT0667
DECLARACIÓN DE CONFORMIDAD UK
UK DECLARATION OF CONFORMITY
UK-KONFOMITÄTSERKLÄRUNG
DÉCLARATION DE CONFORMITÉ UK
DICHIARAZIONE DI CONFORMITÀ UK
KOBOLD MESURA SLU
Avda. Conflent, 68 nave 15 08915 Badalona (España)
We Kobold Mesura S.L.U. declare under our sole responsibility that the product:
Magnetic level switch
RFS…
To which this declaration relates is in conformity with the standards noted below:
BS EN 61010-1:2010
Safety requirements for electrical equipment for measurement,controL, and laboratory use. General re-
quirements
BS EN 61000-6-2:2019
Electromagnetic compatibility (EMC) -- Part 6-2: Generic standards - Immunity for industrial environments
Also, the following UK guidelines are fulfilled:
S.I. 2016/1091 Electromagnetic Compatibility Regulations 2016.
S.I. 2016/1101 Electrical Equipment (Safety) Regulations 2016.
S.I. 2012/3032 The Restiction of the Use of Certain Hazardous Substances in Electrical and
Electronic Equipment Regulations 2012.
Badalona October 2021 Gerente

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18. ATEX Certified
19. Notes

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