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
Operating manual
Platform balance
KERN IEX
Version 1.2
10/2014
GB
Doc.No.IEX-BA-e-1412
GB
KERN IEX
Version 1.2 10/2014
Operating manual
Platform balance
Contents
1 Pay attention to the instructions in the Operation Manual ............................. 3
2 Intended use of IEX scales ................................................................................ 4
3 Design of IEX scales with one weighing cell ................................................... 4
4 ATEX marking – meaning of icon ..................................................................... 6
5 How to install the balance ................................................................................. 8
6 Changing the installation site of the balance ................................................ 11
7 Cleaning and maintenance .............................................................................. 12
8 Technical examination ..................................................................................... 13
2 Doc.No.IEX-BA-e-1412
1 Pay attention to the instructions in the Operation Manual
Carefully read this operati on ma nual be fore setup and
commissioning, even if you are already familiar with
KERN balances.
All language versions contain a non-binding
translation.
The original German is binding.
Conformity with the specifications stated in these operating instructions is a
precautionary measure for the safe operation of OEX scales in explosion protected
spaces.
Employees should familiarize themselves with the device’s components described in
the operating instructions:
• Display KEX-TM
• Power unit IEX-A01-U, IEX-A01-E
These operating instructions should be freely available for consultation to the
employees.
The operating instructions contain the icons shown below:
• Continuously prescribed actions
• Actions prescribed under certain circumstances
• Marking essential paragraphs dealing with explosion protection
These operating instructions may be supplemented by additional warnings and safety
information provided by KERN.
All employees must be informed about new supplements added to these operating
instructions.
Doc.No.IEX-BA-e-1412 3
2 Intended use of IEX scales
Load in ex-protected spaces. It is possible to tare the balance over the entire working
range, thus allowing determination of the net weight.
The design of the balance (construction of non-electrical part of the platform balance
and material used) is in conformity with Directive 94/9/EE, applicable in countries of
the European Union.
• Due to their design, the balances of the IEX series can be used with
a non-
electrical part on the platform and the material used in zones 1
and 2 where
o gasses, mixtures of gasses, vapour types IIA, IIB or IIC
o or explosive groups can develop,
o
as well as for temperature classes T1, T2, T3 or T4.
3 Design of IEX scales with one wei ghing c e ll
The construction of balances with one weighing cell of the IEX series is based on the
modular design principle and comprise:
• Display KEX-TM
• Power unit IEX-A01 by KERN, outside hazardous area
• Weighing cell executed as ex-model
• Weighing platform, non-electric, mechanical balance component.
The display unit for series KEX-TM is connected by a cable to the dynamometric
sensor (one weighing cell) integrated in the platform. The platform balance comprises
a weighing pan made of stainless steel providing sufficient protection and allowing
easy cleaning. The series IEX comprises an aluminium weighing cell, guaranteeing
advanced sturdiness against damaging influences and ambient conditions.
The cable used for connecting the weighing cell to the display unit is protected by a
rod or approx. 3 m long tube.
The display unit is supplied with energy by the KERN mains adapter IEX-A01
positioned outside the haz ar dous ar ea. The mains adapter is plugged into the mains
power supply of 230V.
The housing of the display unit has a marked terminal for the PE conductor
(electrostatic dischar g e) . The housing is connected electrically to the platform
balance by a steel tube.
4 Doc.No.IEX-BA-e-1412
Balance series IEX with display unit KEX-TM
IEX (platform balance 300x300)
IEX – (500x400)
Safe area
Ex-protected area
1 load cell balance
IEX-A01 power unit
Doc.No.IEX-BA-e-1412 5
4 ATEX marking – meaning of icon
• IEX balances meet the requirements of group II, class 2 for devices
in accordance with Directive 94/9/WE and are marked as - II 2 G
IIB T4
.
Explanation of icons as per Directive 94/9/WE:
Balance IEX is intended for indoor and outdoor use. However, they should not be
exposed to chemical vapours, extreme temperatures or extreme humidity. The
platform balance construction is made of soft alloyed steel and the weighing cells are
made of aluminium.
Device group:
I
– Underground pieces
of mines
II – all other places posing
a hazard due to explosive
atmosphere
Category for group II
devices:
1
– The device guarantees
a very high safety level,
- for operation in areas
0,1,2
2
– The device guarantees
a very high safety level,
- for operation in areas
1,2
3
– The device guarantees
a normal safety level,
- for operation in area 2
Explosive atmosphere:
G
– Caused by gas,
steam and mist.
D
– Caused by dust
Electrical
equipment
–
compatible with
one or few types
of explosion
protection
constructions
Icon for explosion
protection used
Construction
type:
o
– Oil protection
p
– Gas
protection
with
excessive
pressure
q
– Sand
protection
d
– Flameproof
protection
e
– Reinforced
construction
ia
– Intrinsically
safe
construction
for operation
in areas
0,1,2,
ib
– Intrinsically
safe
construction
for operation
in areas 1,2,
Temperature class – max
surface temperature of device
parts exposed
to explosive
mixtures:
T1: 4500C
T2: 3000C
T3: 200
0
C
T4: 135
0
C
T5: 100
0
C
T6: 85
0
C
Temperature class
of ga
s and vapour
spontaneous ignition:
T1: > 450
0
C
T2: > 300
0
C
T3: > 200
0
C
T4: > 135
0
C
T5: > 100
0
C
T6: > 85
0
C
Safety level
Gas atmosphere:
-
Ga
-
Gb
-
Gc
Dust atmosphere:
-
Da
-
Db
-
Dc
Gas explosivity group -
Examples:
-
IIA: Propane (T1)
Benzene (T3)
Butane (T2)
Ethyl alcohol (T2)
-
IIB: Ethylene (T2)
-
IIC: Acetylene (T2)
Hydrogen (T1)
,
6 Doc.No.IEX-BA-e-1412
• Ambient temperature d uring operation -10°C to +40°C .
• The balance must be protected against mechanical shocks and
vibrations.
• The IEX balance must be installed and operated by technical staff.
• The balance should be serviced from time to time.
• Prevent electrostatic charge. Ensure that the earth conductor is
connected to the PE conductor on the display unit KEX-TM at all
times.
• Do not disconnect PE conductor.
The use of equipotential bonding is
only admissible where the development of explosive gasses can be
completely ruled out.
•
In the case of damage to the balance, pull the power plug,
disconnect the supply cable and take the device to a safe place for
interim storage so as to prevent any possible use of the balance
before repair.
• The display unit KEX-TM is designed intrinsically safe and is in
conformity with the following standards: PN-EN 60079-0 and PN-EN
60079-11 certified by KDB 14ATEX0110 certificate.
• The display unit is powered by mains adapter IEX-A01 made by
KERN and positioned outside the hazardous and is in conformity
with the standards: PN-EN 60079-0 and PN-EN 60079-11, certificate
KDB 14ATEX0109.
• The platform balances are equipped with Flintec ATEX certified
weighing cells PC22, PC42, PC46, PC60 supplied by Flintec –
certificate BSV 09 ATEX E 086X
• All non-electrical parts of the platform balance have been
manufactured in accordance with standard PN-EN 13463-1.
• All repair and maintenance work during which the housing of the
display unit needs to be opened should be carried out by KERN
customer services. Replace subassemblies with genuine parts. The
balance must not be opened by unauthorised persons as this will
result in loss of all rights to compensation under warranty.
Any installation or repair work deviating from those described in these operating
instructions will inevitably result in loss of warranty.
Doc.No.IEX-BA-e-1412 7
5 How to install the balance
• Prepare the installation site for the IEX balance in a professional manner.
• Ensure that the installation site is dry, level and firm.
• The permissible operating temperate range is from -10°C to +40°C
• The floor base for the installation of the platform balance must be firm enough
for supporting the maximum weight allowed for the load plus the platform
balance.
• The IEX balance has a display unit connected to the platform.
• The display unit is designed for attachment to the table or installation on the
wall with the help of a holder.
• The balance should be unpacked outside the hazardous zone.
• Remove all transport locking devices after unpacking:
CAUTION!
• To prevent electrostatic charge, connect the balance to earth.
• The contact slots for the wires are marked with the icon „ “.
• Prior to transport, prepare a PE conductor for electrostatic connection to earth of
the display unit.
• The PE conductor should end in a loop that is screwed to the display unit with the
help of nuts (M4).
• To ensure that the loop is fixed permanently and in contact with the display unit,
use a lock washer.
• The PE conductor should be of yellow and green colour and provide a sectional
surface of 4mm².
Transport Securing
8 Doc.No.IEX-BA-e-1412
The diag r am below shows the balance’s connecti o n to ear t h:
Place the platform balance and the display unit on the intended installation site in the
ex-area and connect it to earth.
CAUTION!
• The assembly of the display unit, installation of the pl atform
balance and the connection to earth must be carried out within
a time frame that rules out the risk of developing an explosive
atmosphere.
• Place the platform balance in a level, stable place as far away as possible from
heat sources and drafts.
• Level the balance with the help o f the adjus t a bl e feet and a spirit level.
• Check, whether the adjustable feet stand on the balance base.
• Ensure that the weight is evenly distributed among the feet.
• Check once again that the installation site for the balance is level. Exact flat ness
is established when the air bubble of the spirit level is in the centre of the spirit
level ring.
• If further levelling of the platform balance is required, turn the adjustable feet of
the balance in order to adjust the heig ht.
• Check the earth contact springs between the platform balance and the weighing
pan. This ensures that the electrostatic charge is discharged from the weighing
pan.
Ex-protected area
IIB group of explosive gasses
Safe area
Doc.No.IEX-BA-e-1412 9
• Put the weighing pan on the platform balance.
• Position the adapter outside the hazardous area in which an explosive
atmosphere may be expected to be present (that is in a safe place).
• Connect the connecting cable (max. 20 m) to the mains terminal marked DC IN
on the display unit.
1. Mains connection
2. Connection cable
3. Marking PE conductor
4. Shielded load cell cable
5. Sticker power connection
• Prior to initial start-up ensure that there is no risk of expl osi on –
that is, that no explosive atmosphere is present. If it is obvious
that the balance is not functioning properly, disconnect the
balance from the power supply, secure it and contact KERN
customer services.
10 Doc.No.IEX-BA-e-1412
• Connect the mains connection to the power supply of 230V AC.
• For prolonged periods of inactivity disconnect the balance from the power supply.
• Press the ON/OFF button and hold for approx. 1 second.
• After turning on the balance will carry out a self-test.
• Afterwards the balance will change to zero display, thus indicating readiness for
operation.
• The following icons will appear:
Zero indicator
Stability display
kg
Weighing mode / weighing unit
6 Changing the installati on si t e of t he balance
• When the balance is to be taken to a different installation site
please follow the precauti on ary measures stated under chapter 5
of these operating instruction.
Doc.No.IEX-BA-e-1412 11
7 Cleaning and maintenance
•
Unplug the mains plug from the power unit IEX-A01.
• Check, whether the electrostatic earth connection is plugged in correctly and
make sure it is in good working order.
• Clean the balance and the housing, using a slightly moistened cloth.
Simply apply any commercially available cleaning agent available for
domestic use.
• Do not use any agents for clea ning th at may scratch the surf ace
mechanically. Among other things it is covered in a conductive coat that is
important for safe operation.
• The adjustable feet of the platform balance and the shock absorbers
are made of rubber. When they are inside the hazard area, you will
have to use a slightly moistened cloth for cleaning. Moistness
protects against electrostatic charges.
• Make sure that you do not damage the earth contact springs during
cleaning. They serve as a retainer of electrostatic charge on the
weighing pan. They should be approx. 5 mm above the shock
absorbers.
• Do not clean in the presence of explosive gasses.
• The use of concentrated acids, alkaline solutions or alcohols for
cleaning purposes is prohibited.
• The same applies to the use of compressed air and high pressure
cleaning equipment.
12 Doc.No.IEX-BA-e-1412
8 Technical examination
• Technical examination by expert staff is required every three
months.
The examination should include the following:
• Connection to earth quality: The quality of the fastening on the housing and the
resistance of the connection - max. 100Ω.
• The quality of the connection between the platform and the display unit (flexible
steel tube connecting both subassemblies).
• Damage and loss of a connection is inacceptable.
• The electrical connection between the housing and the platform – the maximum
resistance between the weighing pan (put on) should be less than100Ω.
• Stability and levelling of the balance.
Doc.No.IEX-BA-e-1412 13
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