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.
GB KERN IEX Version 1.0 06/2014 Operating- manual Platform balance Contents 1 2 3 4 5 6 7 8 2 General understanding of the manual symbology .......................................... 3 Intended use of scales IEX ................................................................................ 3 Construction of single load cell scales IEX ..................................................... 4 Warnings and security information ..................................................................
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.
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.
IEX – (500x400) 4 Warnings and security information 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. Symbology description according to 94/9/WE Directive: IIB 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.
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.
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.
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. 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. 8 Place the weighing platform on an even and stable foundation distant from source of heat, drafts and leveled.
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. 2. 3. 4. 5. Power socket Power adaptor connector Grounding lamp Load cell conductor Data plate of power connector Before the first start up, make sure, there is no explosion danger – there is no explosive atmosphere.
zero indication stable result kg weight unit 6 Changing the scale place of operation While moving a scale in another place of operation, all safety measures listed in point 5 of this instruction should be taken. 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 Clean the scale and the housing with a slightly moistened cloth.
8 Technical surveys Technical inspection of a scale operating in explosive area has to be carried out by a trained personnel at least once every three months. 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.
