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.
GB KERN IEX Version 1.2 10/2014 Operating manual Platform balance Contents 1 2 3 4 5 6 7 8 Pay attention to the instructions in the Operation Manual ............................. 3 Intended use of IEX scales ................................................................................ 4 Design of IEX scales with one weighing cell ................................................... 4 ATEX marking – meaning of icon .....................................................................
1 Pay attention to the instructions in the Operation Manual Carefully read this operation manual before 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.
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.
Balance series IEX with display unit KEX-TM Safe area Ex-protected area 1 load cell balance IEX-A01 power unit IEX (platform balance 300x300) IEX – (500x400) Doc.No.
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.
• • • • • • • • • • • • Ambient temperature during 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.
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 diagram below shows the balance’s connection to earth: Safe area Ex-protected area IIB group of explosive gasses 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 platform balance and the connection to earth must be carried out within a time frame that rules out the risk of developing an explosive atmosphere.
• • • 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. 2. 3. 4. 5.
• • 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 • 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: button and hold for approx. 1 second.
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. • • • • • • • 12 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 cleaning that may scratch the surface mechanically.
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.