Jola RK 1/K Variant Ex Series Assembly instructions

Installation, Operating and Maintenance 1/8
Instructions for Jola external-mounting limit switches
RK 1/K/…/Variant ./Ex-.. 21.04.2018
Installation, Operating and Maintenance
Instructions for
Jola external-mounting limit switches
RK 1/K/…/Variant ./Ex-..
I M2 Ex ia I Mb
or
II 1 G Ex ia IIC T6 Ga
or
II 2 G Ex ia IIC T6 Gb
These Installation, Operating and Maintenance
Instructions must always be handed over to the
fitter/operator/service personnel
of our products together with all other user
documentation and information!
They should be stored in a safe place together
with all other user documentation and information
so they can be consulted again when necessary at
any time!
Jola Spezialschalter GmbH & Co. KG
Klostergartenstr. 11 • 67466 Lambrecht (Germany)
Tel. [phone] • Fax [phone]
[e-mail] • www.jola-info.de

Installation, Operating and Maintenance 2/8
Instructions for Jola external-mounting limit switches
RK 1/K/…/Variant ./Ex-.. 21.04.2018
1. Area of application
The external-mounting limit switches
JOLA
D-67466 Lambrecht
0080
RK 1/K/…/Variante ./Ex-..
(serial number)
(production year)
I M2 Ex ia I Mb
or
II 1 G Ex ia IIC T6 Ga
or
II 2 G Ex ia IIC T6 Gb
Tamb : - 20°C to + 60°C
INERIS 12ATEX0059
are binary contact devices for use
in underground areas in mines as well as in above-ground areas of mines
which could be at risk due to firedamp and/or flammable dusts:
RK 1/K/…/Variante ./Ex-M I M2 Ex ia I Mb,
in above-ground areas which could be at risk due to a potentially explosive
atmosphere:
RK 1/K/…LF/Variant ./Ex-0G II 1 G Ex ia IIC T6 Ga: in Zone 0, 1 or 2,
RK 1/K/…/Variant ./Ex-1G II 2 G Ex ia IIC T6 Gb: in Zone 1 or 2.

Installation, Operating and Maintenance 3/8
Instructions for Jola external-mounting limit switches
RK 1/K/…/Variant ./Ex-.. 21.04.2018
Application range, mounting and mode of operation of the
RK 1/K/…/Variant ./Ex-.. external-mounting limit switches
The RK 1/K/…/Variant ./Ex-.. external-mounting limit switches are particularly suitable
where the use of conventional limit switches is questionable because of severe
working conditions, e.g. in damp or dirty environment.
The mounting of the RK 1/K/…/Variant ./Ex-.. limit switches has to be effected via a
through hole situated in the middle of the body of the switch.
Through this hole, the limit switch has to be mounted on a horizontal shaft of the
customer’s device which permits a rotation of max. +/- 180°. The rotation of the shaft
causes the switching. In order to prevent an incorrect functioning of the limit switch and
a cable break, a sufficient cable length must be left. After the limit switch has been set
on the shaft, it has to be fixed by the screw placed inside the body of the switch.
The RK 1/K/…/Variant ./Ex-.. limit switches have as switching element a ball-operated
microswitch (changeover contact). Representation of the switching: see below.
The external-mounting limit switches RK 1/K/…/Variant ./Ex-.. are not suitable to
be used on rotating shafts.

Installation, Operating and Maintenance 4/8
Instructions for Jola external-mounting limit switches
RK 1/K/…/Variant ./Ex-.. 21.04.2018
All the technical parameters of the external-mounting limit switch are listed in this
brochure and the accompanying product description. You must always observe and
follow all the instructions relating to these parameters. The units may not be
used for applications outside the specified parameter range.
If the product description is not supplied with the product or is lost, you must always
request a copy of the description prior to installation, connection or start-up and
ensure that it is read and observed by the suitably qualified specialist personnel.
Otherwise the external-mounting limit switch may not be installed, connected
and started up.
2. Preconditions for safe use
Maximum values for
the external-mounting limit switches RK 1/K/…/Variant ./Ex-..
Sensor type
Type designation
Li
Ci
Each
external-mounting
limit switch
RK 1/K/…/Variant ./Ex-..
1 µH per meter
connecting cable
200 pF per meter
connecting cable
Special requirements/conditions for the safe use of the external-mounting
limit switches RK 1/K/…/Variant ./Ex-.. :
To ensure safe operation, power supply to the external-mounting limit switch
RK 1/K/…/Variant ./Ex-.. must be via a Ex ia voltage source with output
circuits which are approved as Ex ia intrinsically safe for use in the
potentially explosive atmosphere which corresponds to the gas explosion
group in which the device is installed: IIC, IIB, IIA respectively I.
Always observe all the restrictions specified with regard to the voltage
source.
The output parameters of the voltage source must be equivalent to or lower than
the input parameters of the units as defined below.
Maximum input parameters at the wires or connection terminals:
Variant
Ui (V) max.
Ii (A) max.
Variant 0
42
0.1
Variant 1
42
0.1
Variant 2
13
0.1

Installation, Operating and Maintenance 5/8
Instructions for Jola external-mounting limit switches
RK 1/K/…/Variant ./Ex-.. 21.04.2018
3. Additional conditions for safe operation
Before installing the external-mounting limit switch RK 1/K/…/Variant ./Ex-.. you
must ensure that the materials used are sufficiently chemically and mechanically
resistant to all external influences.
In case of doubt, consult a suitably trained expert prior to use. Do not use the product
before these questions have been fully clarified.
4. Installation, connection, start-up and maintenance, general regulations
Installation, connection, start-up and maintenance of the external-mounting limit
switch RK 1/K/…/Variant ./Ex-.. may only be performed by suitably qualified
specialist personnel in line with all the information material and documentation
supplied with the the external-mounting limit switch and following all
instructions contained therein.
The qualified specialist personnel must ensure that they are familiar with all
valid standards, regulations, local requirements and specific conditions, in
particular the standards, regulations, local requirements and specific conditions
relating to explosion protection –and must proceed accordingly.
The entire installation set-up of the external-mounting limit switches
RK 1/K/…/Variant ./Ex-.. and of their mounting accessories must always comply
with the standard IEC/EN 60 079-14 resp. the replacing standard.
You must always read –and adhere to the instructions outlined in - the yellow
DIN A 5 leaflet "User information/Instructions for use with mounting, operating and
maintenance instructions for the product...". If the leaflet is not supplied with the
product or is lost, you must always request a replacement leaflet from Jola.
When the external-mounting limit switch RK 1/K/…/Variant ./Ex-..
is equipped with an antistatic connection cable,
the antistatic cable has, under any circumstances,
to be not longer than 30 m.

Installation, Operating and Maintenance 6/8
Instructions for Jola external-mounting limit switches
RK 1/K/…/Variant ./Ex-.. 21.04.2018
5. Installation of the external-mounting limit switches RK 1/K/…/Variant ./Ex-..
The mounting of the RK 1/K/…/Variant ./Ex-.. limit switches has to be effected via a
through hole situated in the middle of the body of the switch.
Through this hole, the limit switch has to be mounted on a horizontal metallic shaft of
the customer’s device which permits a rotation of max. +/- 180°. The rotation of the
shaft causes the switching. In order to prevent an incorrect functioning of the limit
switch and a cable break, a sufficient cable length must be left.
After the limit switch has been set on the shaft, it has to be fixed by the screw placed
inside the body of the switch.
The external-mounting limit switches RK 1/K/…/Variant ./Ex-.. are not suitable to
be used on rotating shafts.
When mounting the external-mounting limit switch, take care to ensure that the
switch and in particular the cable are not damaged by sharp edges and objects.
The horizontal metallic shaft has to be connected to the potential
equalisation system.

Installation, Operating and Maintenance 7/8
Instructions for Jola external-mounting limit switches
RK 1/K/…/Variant ./Ex-.. 21.04.2018
6. Connection
Connect the contact of the external-mounting limit switch RK 1/K/…/Variant ./Ex-..
as shown in the circuit diagram in the supplied product documentation.
If intrinsically safe contact protection relays are used, connect the external-
mounting limit switch RK 1/K/…/Variant ./Ex-.. in line with the instructions
contained in the corresponding production description.
Potential equalisation is necessary with:
the external-mounting limit switch RK 1/K/…/Variant ./Ex-..
and
the metal accessories and the accessories made of antistatic electrically
conductive plastic.
Connection to the potential equalisation system is essential for safe operation
and must never be neglected.
You must also always ensure that you are connecting to the potential equalisation
system and not to a potential earth.
7. Start-up
Prior to start-up, you must re-check the mounting position, the mechanical
fastening and the electrical connection.
In particular, you must check once again that the unit is also connected to the
corresponding, admissible intrinsically safe circuit (see point 2).
In addition, you must also check and verify that there is no possibility
whatsoever of hazardous conditions occurring due to non-adherence to any of
the relevant instructions, standards or official regulations.
Only then may the unit in question be started up electrically.
The entire installation set-up must always comply with the standard
IEC/EN 60 079-14 resp. the replacing standard.
Connect the green-yellow conductor or the non-insulated conductor of
the cable (depending of the type of cable) of
the external-mounting limit switch RK 1/K/…/Variant ./Ex-..
to the potential equalisation system.
The horizontal metallic shaft and all other accessories made of metal or
made of electrically conductive plastic material have as well to be
connected to the potential equalisation system.

Installation, Operating and Maintenance 8/8
Instructions for Jola external-mounting limit switches
RK 1/K/…/Variant ./Ex-.. 21.04.2018
8. Maintenance
The external-mounting limit switches RK 1/K/…/Variant ./Ex-... are maintenance-free
when used in a normal environment without chemically aggressive substances.
To rule out any risks, however, the external-mounting limit switches must be
sight-checked and function-tested by qualified specialist personnel at least once
a year.
Where risks cannot be ruled out, you should adhere to an inspection frequency
suited to the application in question and laid down in consultation with the
relevant supervisory authorities.
If the external-mounting limit switch is installed as a safety element within a system, it
must always be inspected and checked at intervals to be agreed with the local
supervisory authorities.
Prior to all maintenance work, the qualified specialist personnel must inform
themselves of all valid standards, regulations, local guidelines and special
conditions, in particular standards, regulations, local guidelines and special
conditions concerning explosion protection and proceed accordingly.
9. Repair
All alterations and repairs to the external-mounting limit switches must be
performed by the manufacturer's suitably qualified specialist personnel. Under
no circumstances may other individuals or companies perform unauthorised
alterations or repairs.
10.Disposal
The units must be disposed of by depositing them in conformity with the law at an
appropriate collection point for electrical and electronic devices.