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 OEX Version 1.1 10/2014 GB Doc.No.
GB KERN OEX Version 1.1 10/2014 Operating manual Platform balance Contents 1 2 3 5 6 7 8 9 2 Pay attention to the instructions in the Operation Manual ............................. 3 Intended use for OEX balances......................................................................... 4 Design of OEX balances 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 these operating instructions is a precautionary measure for the safe operation of IEX balances in ex-protected spaces.
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.
The balances of the OEX series are equipped with a KEX-TM display unit. Safe area Ex-protected area 1 load cell balance Doc.No.
Models with tripod: Balance model OEX 6K-3HM OEX 10K-3HM OEX 30K-2HM OEX 60K-2HM OEX 100K-1HM A1 306 306 410 500 500 A2 246 246 410 500 500 B 103±3 103±3 98±2 150±5 150±5 C1 268 268 370 400 400 C2 208 208 370 400 400 D ~535 ~535 ~617 ~790 ~790 E ~485 ~485 ~613 ~710 ~710 Balances of the OEX series - dimensions Models without tripod: Balance model OEX 6K-3M OEX 10K-3M OEX 30K-2M OEX 60K-2M OEX 100K-1M A1 306 306 410 500 500 A2 246 246 410 500 500 B 103±3 103±3 98±2 150±5 150±5 C1 268 268 370 40
5 ATEX marking – meaning of icon • The balances of the OEX series meet the requirements of group II, class 2 for devices in as per Directive 94/9/EU and are marked as II 2 G IIC T4.
• • • • • • • • • • • • Ambient temperature during operation -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 that the earth conductor (equipotential) is connected to the KEX-TM display unit at all times. Do not disconnect PE conductor.
6 Installation instruction 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.
Weighing pan Transport Securing 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.
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. • • • • • • • 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.
• • • 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. 2. 3. 4. 5.
• • 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 • 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.
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. • • • • • • • 14 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.
9 Technical examination • Technical examination 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).
