KERN & SOHN OEX User Manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Internet: www.kern-sohn.com
Operating manual
KERN OEX
Version 1.1
10/2014 GB
Platform balance
Fax: +49-[0]7433-9933-149
Doc.No.OEX-BA-e-1411
KERN OEX
Platform balance
GB
Version 1.1 10/2014
Operating manual
Contents
1 Pay attention to the instructions in the Operation Manual ............................. 3
2 Intended use for OEX balances ......................................................................... 4
3 Design of OEX balances with one weighing cell ............................................. 4
5 ATEX marking – meaning of icon ..................................................................... 7
6 Installation instruction for balance ................................................................... 9
7 Changing the installation site for the balance ............................................... 13
8 Cleaning and maintenance .............................................................................. 14
9 Technical examination ..................................................................................... 15
2 Doc.No.OEX-BA-e-1411

1 Pay attention to the instructions in the Operation Manual

Carefully read this operation manual befor e setup and commissioning, even if you are already familiar with
Conformity with these operating instructions is a precautionary measure for the safe operation of IEX balances in ex-protected spaces.
Employees should familiarize themselves with the device’s components described in the operating instructi o ns :
Display KEX-TM
Power unit IEX-A01-U, IEX-A01-E
These operating instru c ti ons 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
KERN balances. All language versions contain a non-binding
translation. The original German is binding.
Marking essential paragraphs dealing with explosion protec t ion
These operating instructions may be supplemented by additional warnings and safety information provided by KERN. All employees must be inform ed abo ut new supplements added to these oper ati ng instructions.
Doc.No.OEX-BA-e-1411 3
electrical part on the platform and the material used in zones 1
o

2 Intended use for OEX balances

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 non­and 2 where
o gasses, mixtures of gasses, vapour types IIA, IIB or IIC o or explosive groups can develop,
as well as for temperature classes T1, T2, T3 or T4.

3 Design of OEX balances with one wei ghing cell

4 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, positioned outside the hazardous zone
Weighing cell executed as ex-model
Weighing platform, non-electric, mechanical balance component.
The display unit of the KEX-TM series is connected by a cable to the integrated dynamometer (a weighing cell) of the platform. The platform bal a nc e compr is es a weighing pan made of stainles s st eel pr oviding sufficient protecti on and al l owing easy cleaning. The balances of the OEX series have a stainless steel weighing cell providing advanced sturdiness against damaging influences in the 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 hazardous area. 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 disc harge). The housing is connected electrically to the platform balance by a steel tube.
4 Doc.No.OEX-BA-e-1411
Safe area
Ex-protected area
1 load cell balance
The balances of the OEX series are equipped with a KEX-TM display unit.
Doc.No.OEX-BA-e-1411 5
Balance model
A1
A2 B C1
C2 D E
OEX 6K-3HM
306
246
103±3
268
208
~535
~485
OEX 10K-3HM
306
246
103±3
268
208
~535
~485
OEX 30K-2HM
410
410
98±2
370
370
~617
~613
OEX 60K-2HM
500
500
150±5
400
400
~790
~710
OEX 100K-1HM
500
500
150±5
400
400
~790
~710
Balances of the OEX series - dimensions
Balance model
A1
A2 B C1
C2
OEX 6K-3M
306
246
103±3
268
208
OEX 10K-3M
306
246
103±3
268
208
OEX 30K-2M
410
410
98±2
370
370
OEX 60K-2M
500
500
150±5
400
400
OEX 100K-1M
500
500
150±5
400
400
Balances of the OEX series - dimensions
Models with tripod:
Models without tripod:
6 Doc.No.OEX-BA-e-1411
II 2 G IIC T4
Category for group II devices: 1
2
3
Explosive atmosphere: G
D
Icon for explosion protection used Construction type: o p
q d e ia
ib
Electrical equipment compatible with one or few types of explosion protection constructions
Gas explosivity group - Examples:
-
-
­,
Temperature class – max surface temperature of device parts exposed to explosive mixtures:
T1: 4500C
of gas and vapour
Safety level Gas atmosphere:
-
-
-
Dust atmosphere:
-
-
-

5 ATEX marking – meaning of icon

The balances of the OEX series meet the requirements of group II,
Icon declaration as per Directive 94/9/EG:
class 2 for devices in as per Directive 94/9/EU and are marked as -
.
– The device
guarantees a very high safety level,
- for operation in areas 0,1,2
– The device
guarantees a very high safety level,
- for operation in areas 1,2
– The device
guarantees a normal safety level,
- for operation in Area 2
The balances of the OEX series are intended for indoor and outdoor use. However, they should not be exposed to aggressive chemical vapours, critical temperatures and high humidity. The platform balance construction is made of stainless steel.
Doc.No.OEX-BA-e-1411 7
– Caused by gas, steam
and mist.
– Caused by dust
– Oil protection – Gas
protection with excessive pressure
– Sand
protection
– Flameproof
protection
– Reinforced
construction
– Intrinsically
safe construction for operation in areas 0,1,2,
– Intrinsically
safe construction for operation in areas 1,2,
T2: 3000C
0
T3: 200
C
0
T4: 135
C
0
T5: 100
C
IIA: Propane (T1)
IIB: Ethylene (T2) IIC: Acetylene (T2)
Benzene (T3) Butane (T2) Ethyl alcohol (T2)
Hydrogen (T1)
Ga Gb Gc
0
T6: 85
C
Temperature class spontaneous ignition:
T1: > 450 T2: > 300 T3: > 200
T4: > 135 T5: > 100 T6: > 85
0
C
0
C
0
C
0
C
0
C
0
C
Da Db Dc
The use of equipotential bonding is
explosive gasses can be
In the case of damage to the balance, unplug the plug, disconnect the supply cable and take the device to a safe area for interim storage so as to prevent any possible use of the balance before
result in loss of all rights to compensation under warranty.
Ambient temperature d ur i ng operati o n -10°C to +40°C.
The balance must be protected against mechanical shocks and
vibrations.
The OEX balance must be installed and operated by expert staff.
The balance should be serviced from time to time.
Prevent electrostatic charge. Ensure t hat the ear th c ond uc tor
(equipotential) is connected to the KEX-TM display unit at all times.
Do not disconnect PE conductor. only admissible where the development of completely ruled out.
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 balance is used with weighing cells PC6, PC22, PC42, PC60 and PCB supplied by Flintec which are certified for safe use in hazardous areas - certi fica te BS V 09 ATE X 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
Any installation or repair work deviating from those described in this manual will inevitably result in loss of warranty.
8 Doc.No.OEX-BA-e-1411
Weighing cell conductor
Transport Securing Tripod
Washer
Nut

6 Installation instr uction for balance

Prepare the installation site for the OEX 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.
Balances of the OEX series without tripod have a display unit that can be connected to the wall via a cable with the help of a holder.
The display unit is designed for attachment to a table or for installation on a wall with the help of a holder.
o Unpack the balance outsi de the hazardous area. o Remove all transport locking devices after unpacking:
o Attach tripod to platform. o Feed excess cable into the tripod.
o Lift the weighing pan and remove the transport locking device.
Doc.No.OEX-BA-e-1411 9
Transport Securing
Weighing pan
Safe area
Ex-protected area
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.
The diagram below shows the balance’s connection to earth:
Place the platform balance and the display unit on the intended installation site in the ex-area and connect it to earth.
10 Doc.No.OEX-BA-e-1411
atmosphere.
CAUTION!
The assembly of the display unit, installation of the platform
balance and the connection to earth must be carried out within a time frame that rules out the risk of developing an explosive
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 of the adjustable 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 nes s
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.
Doc.No.OEX-BA-e-1411 11
power supply, secure it and contact KERN customer services.
Put the weighing pan on the platform balance.
Position the mains 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, make sure that there is no risk of explosion –
12 Doc.No.OEX-BA-e-1411
that no explosive atmospher e is pr ese nt . If it is obvious that the balance is not working correctly, disconnect the balance from the
If the balance is to be taken to another installation site carry out all operating instructions.
Connect the adapter to a 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
kg
Stability display Weighing mode / weighing unit

7 Changing the installation site for the balance

the precautionary measures described in chapter 6 of these
Doc.No.OEX-BA-e-1411 13

8 Cleaning and maintenance

Unplug the mains plug of 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 sur face mechanically. Among other thi ngs it i s c over ed i n a c onduc tiv e c oat tha t 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.
14 Doc.No.OEX-BA-e-1411

9 Technical examination

Technical examinati on by expert staff is required every three months.
The examination should include the following:
Condition of connection to earth for balance display unit, including:
o Fastening of display housing and electrical resistance - max. 100Ω, o Fit a flexible steel tube for the protection of the conductor leading to the
platform balance and the display unit (regular balances with “cabled” display).
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.OEX-BA-e-1411 15
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