KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Safety-usage manual
KERN IEX
Version 1.0
06/2014
GB
IEX-BA-e-1410
GB
KERN IEX
Version 1.0 06/2014
Operating- manual
Platform balance
Contents
1 General understanding of the manual symbology .......................................... 3
2 Intended use of scales IEX ................................................................................ 3
3 Construction of single load cell scales IEX ..................................................... 4
4 Warnings and security information .................................................................. 5
5 Installation instruction of scale ......................................................................... 7
6 Changing the scale place of operation ........................................................... 10
7 Cleaning and maintenance .............................................................................. 10
8 Technical surveys ............................................................................................ 11
2 IEX-BA-e-1410
marking of passages that are crucial for anti-explosive safety.
Scales of IEX serie, because of the construction of the non-electrical
part of the platform and used material, can be used in zones 1 or 2
endangered for appearance of gases, mixture of gases, mists form
IIA or IIB explosive groups and T1, T2, T3 or T4.temperature class.
1 General understanding of the manual symbology
Observing prescriptions of this manual is a crucial precaution concerning safe
operation in explosive atmospheres as far as IEX scales are concerned.
All users and the personnel responsible for maintenance should be familiar
with this manual and manuals describing functional parts of this device:
Indicator KEX-TM
Power adaptor IEX-A01-U, IEX-A01-E
The mentioned manual should be accessible all the time for people who are
involved in working or maintenance of the device.
You can find following symbology in this manual:
Activities always required
Activities required only under certain circumstances,
„Safety usage manual” can be complement with additional warnings and security
information provided by KERN.
The whole personnel should be informed about any released appendix to this
manual.
2 Intended use of scales IEX
IEX scales are intended to mass measurements in hazardous areas endangered to
appearance of explosive atmosphere. They can be used for weighings goods.
Tarring within the whole range of measurement allows to measure net mass of loads.
Scale construction is compatible with Directive 94/9/EC valid for the countries of
European Union.
IEX-BA-e-1410 3
IEX (300x300 platform)
3 Construction of single load cell scales IEX
Single load cell scales series IEX feature modular construction comprising:
Indicator KEX-TM
Power adapter IEX-A01 manufactured by KERN, located outside the explosive
zone
Load cell in Ex version
Weighing platform - non-electric scale’s mechanical component.
Indicator series KEX-TM is plugged with a cable to a force measuring sensor (a load
cell) installed in a stainless steel weighing platform. The weighing platform features a
surface plate also made of stainless steel ensuring adequate protection and
providing easy cleaning. Scales series IEX feature a aluminum load cell ensuring
upgraded robustness against harmful influence of the surrounding conditions.
The cable connecting the load cell and the indicator is protected by a pillar or a a ~ 3
meter flexible tube.
The indicator is powered from KERN power adapter IEX-A01, which is located
outside the explosive area. The power adapter is plugged to mains 230V.
The indicator’s housing features a marked grounding clamp for connecting grounding
conductor (static electricity discharge). The housing is electrically connected with the
weighing platform using a steel flexible tube.
Scales series IEX comprising an indicator KEX-TM
4 IEX-BA-e-1410
IEX – (500x400)
IEX scales observe the requirements of the group II, category 2 of
devices compliant with 94/9/WE Directive and are marked - II 2
G IIB T4.
IIB
4 Warnings and security information
Symbology description according to 94/9/WE Directive:
IEX scales are intended to interior and outdoor operation. But it should not be
exposed to active chemical vapours, extreme temperatures and huge humidity.
Platform’s construction is made of mild steel, load cells are made of aluminum.
IEX-BA-e-1410 5
Ambient temperature during operation: -10°C to +40°C.
Scales cannot be exposed to mechanical shocks or vibrations.
IEX scales can be installed and used only by a skilled, trained
personnel.
Scales should undergo periodical technical surveys .
Gathering electrostatic charge should be avoided. Grounding wire
(equipotential) needs to be always connected to the grounding
terminal in KEX-TM indicator.
Disconnecting of the grounding wire is forbidden.
Equipotentialisation wire can be allowed only when the appearance
of explosive gases is impossible.
In case of any damage unplug the supply source, disconnect the
supply cord and then move the device to the safe area for
temporarily storage to prevent it from using until it is repaired.
KEX-TM indicators has an intrinsic safety construction that comprise
with the standards: PN-EN 60079-0 and PN-EN 60079-11 which is
confirmed by KDB 14ATEX0110 certificate.
The indicator is supplied from IEX-A01 power supplier made by
KERN, placed outsider the hazardous area and compliant with: PNEN 60079-0 and PN-EN 60079-11 standards - KDB 14ATEX0109
certificate
Platforms are equipped in ATEX certified load cells PC22, PC42,
PC46, PC60 made by Flintec - BSV 09 ATEX E 086X certificate
Non-electrical elements of the platform are made according to PN-
EN 13463-1 standard.
All repairs and maintenance work that require opening the indicator
housing should be made by authorised service of KERN.
Subassemblies should be substituted by original equivalents. If the
scale is opened by unauthorised people all claims connected with
warranty are forfeiture.
Any installation and maintenance work, that are at variance with this manual will
cause forfeiture of all warranty claims.
6 IEX-BA-e-1410
CAUTION!
In order to dissipate static electricity, it is necessary to ground the
scale’s indicator.
Places for plugging the wires are marked with “ ” symbol.
5 Installation instruction of scale
For IEX scales prepare an appropriate place for installation.
It should be dry, even and rigid
Acceptable operation temperature range -10°C to +40°C
The ground on which the platform is to be placed must be able to carry the
maximal load together with the platform
IEX scales are equipped with the indicator connected with the platform
The indicator can be mounted on the table or installed on a wall by means of a
handler.
Scale should be unpacked outside the hazardous area.
After unpacking remove all transport protections:
Before moving the scale to its intended place of use, prepare a conductor for
electrostatic grounding of the indicator.
The grounding conductor should be ended with a loop that is screwed to the
indicator using M4 nut.
In order to ensure constant holding down the loop to the indicator´s housing, use
tooth lock washer.
The grounding conductor should have yellow and green colour with minimal
intersection 4mm².
IEX-BA-e-1410 7
CAUTION!
Installing of the indicator, placing the weighing platform and
connecting grounding must be carried out at a time when there
is no risk of the emergence of an explosive atmosphere.
Below drawing presents the means of scale grounding:
Place the weighing platform and the indicator in its intended place of use in the EX
zone and ground them.
Place the weighing platform on an even and stable foundation distant from
source of heat, drafts and leveled.
Level the scale using adjustable feet and a level.
Check whether the adjustable feet rest on the scale’s foundation.
Each adjustable feet should take an equal amount of load.
Double check the level of scale location. In correct leveling, the air bubble should
be located within the centre of level’s ring.
If the weighing platform requires leveling, then screw scale’s adjustable feet to
adjust level.
Check the grounding-mass springs between the weighing platform and the
weighing pan ensuring the discharge of static electricity from the weighing pan.
8 IEX-BA-e-1410
Before the first start up, make sure, there is no explosion danger –
there is no explosive atmosphere. If there is any sign that the
scale is not working properly, unplug it from mains, secure it and
notify KERN service.
Put the weighing pan onto the weighing platform,
Place the power adapter outside the explosive zone (i.e. in a safe area),
Plug the cable (~20 m) to the power outlet DC IN on scale’s indicator
KEX-TM.
1. Power socket
2. Power adaptor connector
3. Grounding lamp
4. Load cell conductor
5. Data plate of power connector
Connect the supplier to mains 230V AC.
In case of prolonged not using of the scale – unplug it from mains.
Press ON/OFF to switch on the device – keep pressing it for about 1 sec.
Wait for the test completion, then you will see zero indication and pictograms:
IEX-BA-e-1410 9
zero indication
stable result
kg
weight unit
While moving a scale in another place of operation, all safety
measures listed in point 5 of this instruction should be taken.
Clean the scale and the housing with a slightly moistened cloth. You
can use typical domestic cleaning agents.
For clearing an overlay of the indicator do not use agents that can
mechanically scratch the surface. It includes an internal conductive
layer that is important for save operation.
Platform levelling feet and shock absorbers are made of rubber.
Within the hazardous area they need to be cleaned with a slightly
moistened cloth. Moisture protects against gathering electrostatic
charges.
While cleaning the platform do not damage the masking springs.
They are for gathering electrostatic charges from the weight pan.
They should be ~5mm above the shock absorbers.
Cleaning may not be performed when there are explosive gases.
There is forbidden to use concentrated acids, bases, solvents or
alcohol for cleaning the device.
There is also forbidden to use compressed air and high pressure
washing equipment.
6 Changing the scale place of operation
7 Cleaning and maintenance
Unplug the power adapter IEX-A01 from mains.
Check wether the indicator´s electrostatic grounding is correctly plugged and is
not defected.
10 IEX-BA-e-1410
Technical inspection of a scale operating in explosive area has to be
carried out by a trained personnel at least once every three months.
8 Technical surveys
Each technical inspection should cover:
Grounding quality: the quality of fastening to the housing and the resistance of
connection - max. 100Ω,
Quality of the connection between the platform and the indicator (pliant steel pipe
connecting the two subassemblies).
The damage and loosing one of connection is inadmissible.
Electrical connection between the housing and the platform - max. resistance
between the weight pan (put on) and the housing should be lower than 100Ω.
Stability and levelling of the scale.
IEX-BA-e-1410 11
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