Operating instructions School balance
Contents
1. IN KERN amp Sohn GmbH WAAGEN GEWICHTE BALANCES WEIGHTS Ziegelei 1 Tel 49 0 7433 9933 0 D 72336 Balingen Fax 49 0 7433 9933 149 E Mail info kern sohn com Internet www kern sohn com Operating instructions School balance KERN 442 Version 1 5 07 2003 GB 442 BA e 0315 KERN 442 Version 1 5 07 2003 Operating instructions School balance Tabel of contents 1 Technical data 2 Declaration of conformty 3 Fundamental information general 3 1 Intended use 3 2 Inappropriate use 3 3 Guarantee 3 4 Monitoring the test substances d Fundamental safety information 4 1 Observe the information in the operating instructions 4 2 Staff training 5 Transport and storage 5 1 Acceptance check 5 2 Packaging 6 Unpacking installation and commissioning 6 1 Place of installation place of use 6 2 Unpacking 6 2 1 Installation 6 2 2 List of items supplied 6 3 Mains supply 6 4 Battery Operation 6 5 Initial start up 6 6 Adjustment 6 7 Adjusting 7 Operation 7 1 Overview of display 7 2 Operating elements 7 2 1 Weighing ON 7 2 2 Taring Late key 7 2 3 Plus Minus Weighings 7 2 4 Units 8 Maintenance upkeep disposal 8 1 Cleaning 8 2 Maintenance upkeep 8 3 Disposal 9 Troubleshooting 2 15 08 200713442 BA e 0315 OO oo Oo oO Jr OO Om OO Om OO OO Om P Ga 1 Technical data KERN 442 43N 442 51N Readout 0 19 19 Weighing range 400g 4 000 g Taring ra2. d to the monitoring of balance test substances and the test weights required for this Test weights and balances can be adjusted quickly and at a reasonable price in KERN s accredited DKD calibration laboratory return to na tional normal 4 Fundamental safety information 4 1 Observe the information in the operating instructions Please read the operating instructions carefully before erecting and commissioning even if you already have experience with KERN balances 4 2 Staff training The device may only be operated and looked after by trained members of staff 5 Transport and storage 5 1 Acceptance check Please check the packaging immediately upon delivery and the device during un packing for any visible signs of external damage 5 2 Packaging Please retain all parts of the original packaging in case it should be necessary to re turn items at any time Only the original packaging should be used for return consignments Before despatch disconnect all attached cables and loose movable parts Apply any intended transport security devices Secure all parts e g glass windshield weighing plate power unit etc to prevent slipping and damage 6 15 08 200713442 BA e 0315 6 Unpacking installation and commissioning 6 1 Place of installation place of use The balance is constructed in such a way that reliable weighing results can be achieved under normal application conditions By selecting the correct location for your ba
3. estamos en la presente que el producto al que se refiere esta declaraci n est a de acuerdo con las normas siguientes Italiano Dichiariamo con cid che il prodotto al quale la presente dichiarazione si riferisce confor me alle norme di seguito citate Electronic Scale KERN 442 N Mark applied EU Directive Standards 89 336EEC EMC EN 61000 6 3 2001 C EN 61000 3 2 2000 EN 61000 3 3 1995 A1 2001 EN 61000 6 1 2001 Date 01 July 2003 Signature Gottl KERN amp Sohn GmbH Management Gottl KERN amp Sohn GmbH Ziegelei 1 D 72336 Balingen Tel 49 0 7433 9933 0 Fax 49 0 7433 9933 149 4 15 08 200713442 BA e 0315 3 Fundamental information general 3 1 Intended use The balance you have acquired serves to determine the weighing value of the mate rial to be weighed It is intended to be used as a non automatic balance i e the material to be weighed is manually and carefully placed in the centre of the weighing plate The weighing value can be read off after a stable weighing value has been ob tained 3 2 Inappropriate use Do not use the balance for dynamic weighing In the event that small quantities are removed or added to the material to be weighed incorrect weighing results can be displayed due to the stability compensation in the balance Example Slowly drain ing fluids from a container on the balance Do not leave a permanent load on the weighing plate T
4. ge the Units with the key Press an hold the key few seconds later change the unit 442 BA e 0315 11 8 Maintenance upkeep disposal 8 1 Cleaning Please disconnect the device from the operating voltage before cleaning Only use a cloth dampened with mild suds and not aggressive cleaning agents sol vents or similar Please ensure that fluids are not able to get into the device and rub off using a clean soft cloth Loose sample residue powder can be removed carefully using a brush or hand vac uum cleaner Remove any spilt material to be weighed immediately 8 2 Maintenance upkeep The device may only be opened by trained service engineers authorised by KERN Disconnect from the mains supply before opening 8 3 Disposal The operating company shall dispose of the packaging and the device in compliance with the valid national or regional law of the operating location 12 15 08 200713442 BA e 0315 9 Troubleshooting The balance should be switched off for a short time following an interruption in the programme sequence and disconnected from the mains supply It is then necessary to repeat the weighing process from the beginning Help Interruption Weight display is not illuminated e The weight display changes continu e ally The weighing result is obviously in e correct Possible cause The balance is not switched on The mains supply connection has been interrupted mains cable not plugged in faulty Po
5. his can damage the measur ing equipment Be sure to avoid impact shock and overloading the balance in excess of the pre scribed maximum load rating max minus any possible tare weight that is already present This could cause damage to the balance Never operate the balance in hazardous locations The series design is not explo sion proof Structural alterations may not be made to the balance This can lead to incorrect weighing results faults concerning safety regulations as well as to destruction of the balance The balance may only be used in compliance with the described guidelines Varying areas of application planned use must be approved by KERN in writing 3 3 Guarantee The guarantee is not valid following non observation of our guidelines in the operating instructions use outside the described applications alteration to or opening of the device mechanical damage and damage caused by media liquids natural wear and tear inappropriate erection or electric installation overloading of the measuring equipment 442 BA e 0315 5 3 4 Monitoring the test substances The metrology features of the balance and any possible available adjusting weight must be checked at regular intervals within the scope of quality assurance For this purpose the answerable user must define a suitable interval as well as the nature and scope of this check Information is available on KERN s home page www kern sohn com with regar
6. ht at the bottom of the display If the object should be heavier than the weighing range allowance the symbol E overload will appear on the display 7 2 2 Taring 6 key Switch the balance on by pressing the key then wait for the 0 indication Place the tare cup on the weighing pan and press the key Display again shows 0 Now the weight of the tare cup is memorised internally By pressing the key after a weighing procedure 0 will appear on the display again The taring procedure can be repeated continuously for instance when mixing several components The limit is reached when the full weighing range is used After having removed the tare cup the total weight will appear as a negative value 10 15 08 200713442 BA e 0315 7 2 3 Plus Minus Weighings For instance to control piece weights filling process control etc Switch the balance on by pressing the key then wait until O is indicated Place rated weight on the weighing pan and tare on O by pressing the key Remove rated weight Place the objects on the weighing pan successively the balance will show any devia tion from the rated weight According to the same procedure packages with the same weight related to a rated weight can be produced Return to the weighing mode by pressing the key 7 2 4 Units Different foreign weighing units are integrated into the various balance models de tails capture Technical data Chan
7. ighing pan Battery or mains adapter Operating instructions 6 3 Mains supply Electric power supply is by means of the external mains supply circuit The printed voltage level must comply with the local voltage Only use original KERN mains supply circuits The use of other makes is subject to approval by Kern 6 4 Battery Operation Remove the battery cover from the bottom of the balance Connect 9 V block batteries Re insert the battery cover Battery conservation through automatic power off 1 2 minutes after the last weigh ing operation When the battery power is used up the display will show LO Press the key and change the batteries at once When the balance is not in use for a longer period of time remove batteries and keep them separately Leakage of battery liquid might damage the balance 6 5 Initial start up A warm up time of 1 minutes stabilises the measured values after switching on The accuracy of the balance depends on the local acceleration of the fall Please be sure to observe the information in the chapter on adjusting 8 15 08 200713442 BA e 0315 6 6 Adjustment As the acceleration value due to gravity is not the same at every location on earth each balance must be coordinated in compliance with the underlying physical weighing principle to the existing acceleration due to gravity at its place of location only if the balance has not already been adjusted to the location in the factory Th
8. is adjustment process must be carried out during the initial start up after change in lo cation and variation of surrounding temperature It is also recommendable to adjust the balance periodically during weighing operation in order to obtain exact measured values 6 7 Adjusting Using a precision weight the accuracy of the balance can be checked at any time and adjusted Adjustment procedure Check that the surrounding conditions are stable A short warm up time of about 1 minutes are recommended for stabilisation Press key approx 3 seconds CAL 0 and then the exact weight of the adjusting weight will appear the display Place the adjusting weight on the centre of the weighing plate Shortly after CAL F appears and then the balance switched off In case of an adjusting error or a wrong adjusting weight E appears in the display and then turn off 442 BA e 0315 9 7 Operation 7 1 Overview of display 7 2 Operating elements 7 2 1 Weighing Switch the balance on by pressing the key The balance will show 8888 for approx 3 seconds and then change to 0 Now it is ready for use Important If the display flashes or does not show 0 press the key Only now place object on the weighing pan Make sure that the weighing object does not stripe or touch the housing or base Now the weight will be indicated After a successful stability control a small triangle will appear on the far rig
9. lance you will be able to work quickly and precisely Therefore please observe the following at the place of installation Place the balance on a firm level surface Avoid extreme heat as well as temperature fluctuation caused by installing next to a radiator or in the direct sunlight Protect the balance against direct draughts due to open windows and doors Avoid jarring during weighing Protect the balance against high humidity vapours and dust Do not expose the device to extreme dampness for longer periods of time In admissible bedewing condensation of air moisture on the device can occur if a cold device is taken into a significantly warmer environment In this case please acclimatise the device for approx 2 hours at room temperature after it has been disconnected from the mains Avoid static charging of the material to be weighed weighing container and windshield Major display deviations incorrect weighing results are possible if electromagnetic fields occur as well as due to static charging currents and instable power supply It is then necessary to change the location 442 BA e 0315 7 6 2 Unpacking Carefully remove the balance from its packaging remove the plastic wrapping and position the balance in its intended working location 6 2 1 Installation Install the balance in such a fashion that the weighing plate is absolutely horizonta 6 2 2 List of items supplied Standard accessories Balance We
10. nge subtractive 4009 4 000 g Reproducibility 0 19 19 Linearity 0 29 29 Adjusting weight not included Adjust 200g M2 20009 M2 ment tolerance class Stabilisation time typical 3 sec Units g tol tlt g tol tlt Optimal temp of operation 10 C 30 C Humidity max 80 non condensing Casing W x D x H mm 145 x 185 x 55 Weighing pan mm 125 Weight kg net 0 5 442 BA e 0315 2 Declaration of conformty K E Fe N KERN amp Sohn GmbH D 72322 Balingen Frommern Tel 0049 0 7433 9933 0 A WAAGEN GEWICHTE BALANCES WEIGHTS Weg Postfach 4052 Fax 0049 017433 9933 149 E Mail info kern sohn de Internet www kern sohn de Konformitatserklarung Declaration of conformity for apparatus with CE mark Konformitatserklarung fur Gerate mit CE Zeichen D claration de conformit pour appareils portant la marque CE Declaraci n de conformidad para aparatos con disitintivo CE Dichiarazione di cofnromita per apparecchi contrassegnati con la marcatura CE English We hereby declare that the product to which this declaration refers conforms with the fol lowing standards Deutsch Wir erklaren hiermit daB das Produkt auf das sich diese Erklarung bezieht mit den nach stehenden Normen bereinstimmt Francais Nous d clarons avec cela responsabilit que le produit auquel se rapporte la pr sente d claration est conforme aux normes cit es ci apres Espanol Manif
11. wer supply interrupted The batteries are wrongly inserted the batteries are empty No batteries are attached Draught air movement Table floor vibrations The weighing plate is in contact with for eign matter Electromagnetic fields static charging choose different location switch off inter fering device if possible The balance display is not set to zero Adjustment is no longer correct Great fluctuations in temperature Electromagnetic fields static charging choose different location switch off inter fering device if possible Switch the balance off if other error messages should appear and then switch on again Contact the manufacturer if the error message does not disappear 442 BA e 0315 13
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