KERN & Sohn GmbH Ziegelei 1 D-72336 Balingen E-Mail: info@kern-sohn.com Tel: +49-[0]7433- 9933-0 Fax: +49-[0]7433-9933-149 Internet: www.kern-sohn.com Operating instruction Precision balance KERN PLJ-GM Version 1.
GB KERN PLJ-GM Version 1.2 03/2013 Operating instruction Precision balance Table of Contents 1 Technical data ................................................................................................ 4 2 Declaration of conformity ............................................................................. 5 3 Basic Information (General) .......................................................................... 6 3.1 3.2 3.3 3.4 Proper use ....................................................
8 User menu .................................................................................................... 19 8.1 8.2 8.2.1 8.2.2 8.3 8.3.1 8.3.2 8.4 8.5 8.5.1 8.6 8.6.1 8.6.2 8.6.3 8.6.4 8.6.5 8.6.6 8.7 8.7.1 8.7.2 8.7.3 8.7.4 8.8 8.9 8.10 8.10.1 8.10.2 8.11 8.12 8.13 8.14 8.15 8.15.1 Keyboard overview in menu .................................................................................................. 20 Calling a menu / jumping back to weighing mode .........................................
1 Technical data KERN PLJ 600-2GM PLJ 6000-1GM Readability (d) 0.01 g 0.1 g Weighing range (max) 600 g 6 kg Taring range (subtractive) 600 g 6 kg Reproducibility 0.02 g 0.2 g Linearity 0.02 g 0.2 g Minimum unit weight at piece counting 0.01 g 0.1 g Warm-up time 2 hours 2 hours Adjustment weight internal internal Wind protection yes no Reference quantities at piece counting 10, 20, 50, 100, freely selectable Weighing Units g, kg Stabilization time (typical) 3 sec.
2 Declaration of conformity KERN & Sohn GmbH D-72322 Balingen-Frommern Postfach 4052 E-Mail: info@kern-sohn.de Tel: 0049-[0]7433- 9933-0 Fax: 0049-[0]7433-9933-149 Internet: www.kern-sohn.
3 Basic Information (General) 3.1 Proper use The balance you purchased is intended to determine the weighing value of material 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. As soon as a stable weighing value is reached the weighing value can be read. 3.2 Improper Use Do not use balance for dynamic weighing.
3.4 Monitoring of Test Resources In the framework of quality assurance the measuring-related properties of the balance and, if applicable, the testing weight, must be checked regularly. The responsible user must define a suitable interval as well as type and scope of this test. Information is available on KERN’s home page (www.kern-sohn.com with regard to the monitoring of balance test substances and the test weights required for this.
5.2 Packaging / return transport Keep all parts of the original packaging for a possibly required return. Only use original packaging for returning. Prior to dispatch disconnect all cables and remove loose/mobile parts. Reattach possibly supplied transport securing devices.
Secure all parts such as glass wind screen, weighing platform, power unit etc. against shifting and damage. 3 3 4 1 2 3 1. 2. 3. 4.
6 Unpacking, Setup and Commissioning 6.1 Installation Site, Location of Use The balances are designed in a way that reliable weighing results are achieved in common conditions of use. You will work accurately and fast, if you select the right location for your balance.
6.2.2 Setup Level balance with foot screws until the air bubble of the water balance is in the prescribed circle. 6.2.3 Scope of delivery Serial accessories: Balance Weighing plate Mains power supply Operating Manual Protective cover Hook for underfloor weighing (only model PLJ 6000-1GM) 6.3 Mains connection Power is supplied via the external mains adapter. The stated voltage value must be the same as the local voltage. Only use original KERN mains adapters. Using other makes requires consent by KERN. 6.
6.5.2 Balance zero display If an exact zero reading is not displayed on the balance in spite of the weighing dish TARE being empty, press the and the balance will start resetting to zero [ ] . To reset the balance to zero, the may be used if the load amounts to less than 2% of the maximum weight. If the load exceeds 2% error message ERR2 will be displayed. 6.
6.6.3 Sequence of temperature-controlled adjustment: At a change in temperature of 3°C the balance announces the internal adjustment via the display „CALib“ The balance starts the adjustment process and displays „CAL-t“. If the adjustment process is finished, the balance will automatically return into the weighing mode. 6.6.4 Sequence of time-controlled adjustment: After 3 hours, the automatic adjustment is started. „CALib“ is displayed. The balance starts the adjustment process and displays „CAL-C“.
6.7 Verification General: According to the EU guideline 90/384/EEC balances must be verified officially if they are to be used as follows (legally regulated area): a) For commercial transactions if the price of goods is determined by weighing b) For the production of medines in pharmacies as well as for analyses in the medical and pharmaceutical laboratory c) For official purposes d) For the production of finished packages In case of doubt, please contact your local office of weights and measures.
6.8 Underfloor weighing Objects unsuitable for placing on the weighing scale due to size or shape may be weighed with the help of the flush-mounted platform. Proceed as follows: Switch off balance. Open the closing lid on the bottom of your balance. Suspend hook for underfloor weighing carefully and completely. Place your balance over an opening. Suspend the goods to be weighed from the hook and carry out the weighing. Fig.
7 Operation 7.1 Operating elements 7.1.1 Backlit display Very contrastful display which can also be red in the darkness. 7.1.
The balance carries out an automatic check, when started. First this involves all display elements being lit up. Next the software version appears. After the message –test- , SLA will appear which indicates the use of rechargeable batteries. 7.1.
g +/- tolerance with respect to reference weight within prescribed limits ok +/- tolerance with respect to reference weight entry of upper limit or weight above tolerance Max g CALib Stability test for internal adjustment CAL-H Manual internal adjustment CAL-A Automatic internal adjustment after switching on CAL-t Temperature-controlled internal adjustment CAL-C Time-controlled internal adjustment Abort Cancelling the internal adjustment process 18 P
8 User menu The user menu has six main menus (P1 – P6), arranged in the following sub-menus: P1 rEAd 1.1 FiL 1.2 Auto 1.3 tArA 1.4 Fnnd 2 YES no no Filter settings Auto Zero Tare function Weighing value averaging 2.1 Pr_n 2.2 S_Lo 2.3 bAud 2.4 S_rS StAb 9600 8d1SnP Setting data output type Entering minimum weight Setting baud rate Setting transmission parameter 3.1 StUn kg Setting standard weighing unit 4.1 FFun 4.2 Funi 4.3 PcS 4.4 HiLo 4.5 PrcA 4.6 Prcb 4.7 AtAr 4.8 toP 4.9 Add 4.A AnLS 4.
8.1 Keyboard overview in menu Button Function F PRINT Access to Main menu Press and at the same time TARE Enter pretaring value TARE Battery/rechargeable battery loading status display and F and Change between gross and net weight value TARE PRINT and Exit function without storing F Jump to higher level in menu Selecting parameter level Changing parameter value Entering the selected sub-menu TARE Activating a changed parameter Confirm entry PRINT 8.
8.2.2 Storing / jumping back to weighing mode Any changes made in the balance memory will only be saved when the storing process is complete. F For this, press repeatedly until SAuE ? appears on the display. PRINT Any changes carried out are stored by pressing . To cancel changes, press F . Afterwards the balance automatically jumps back to weighing mode. 8.3 Weighing 8.3.1 Simple weighing Operation: Turn on balance by pressing will carry out a self-test Display: ON OFF .
8.3.2 Standard weighing unit Selected weighing unit will be retained even after disconnection from the mains. Start balance by pressing F Press Press 0.00 g PRINT and P1.rEAd at the same time Repeatedly press Press ON OFF P3.Unit until P3.Unit appears TARE P3.1.StUn TARE Press anew g to change selection ct PRINT Setting will be imported by pressing the button. P3.1.StUn F For this, press repeatedly until SavE ? appears on the display.
8.4 Taring The dead weight of any weighing container may be tared away by pressing a button, so that the following weighings show the net weight of the goods to be weighed. Operation: Turn on balance by pressing Display: ON OFF Your balance is ready to weigh as soon as the “0.00" display appears. 0.00 g Put on items to be weighed, weighed value is displayed. Wait for standstill display [ ] 19.68 g TARE To start the taring process press . The weight of the container is now saved internally.
8.5 P4 Func – operating modes Go to menu "P4 Func“, to activate or deactivate functions that are then made available to the operator. All activated operating modes can be called directly by pressing the F key. Call P4 Func: Operation: Display: Description: Turn on balance by pressing the 0.00 g ON OFF F PRINT Press and simultaneously Repeatedly press P4.Func appears TARE Press TARE P1.rEAd until P4.Func 4.1.FFun All operating modes enabled in menu 4.2 to 4.
Press toP Peak value function Press Add Adding function Press AnLS Animal weighing function Press tArE Pretaring value PRINT Confirm settings by pressing . Balance jumps back to sub-menu 4.1.FFun. F For this, press repeatedly until SavE ? appears on the display. Store changes PRINT carried out by pressing . Is the parameter set to ALL in menu 4.1.FFun, access to the functions set to YES in the P4FFunc menu is available via the F key. However, if in menu 4.1.
8.5.1 Settings for menu item P4.1 FFun for “ALL” F Here, you select the menu items that are subsequently selectable with no function not available. YES function is available. Operation: . Display: Selecting the menu item P4 Func TARE Press 4.1.FFun Press 4.2.Funi Press until the operating mode “piece counting” appears 4.3.PcS TARE Press until active setting appears: “no“ = deactivated, “yes“ = activated To change the setting, press YES .
8.6 P5 othr – operating parameter Here, you can set the parameters that influence the operation of the balance, such as background lighting and key sounds. 8.6.1 Background lighting for mains operation Possible settings: no YES Auto Background lighting turned off Background lighting turned on Background lighting is turned off automatically every 10 seconds if no change of display takes place Operation: Display: Selecting the menu item P5 othr TARE 5.1.
8.6.2 Intensity of background lighting for battery operation To optimize readability and energy consumption, the intensity of the background lighting can be adjusted from 0 to 100%. Low intensity prolongs battery life. When operated by battery, the background lighting is turned off automatically every 10 seconds if no change of display takes place. Operation: Display: Selecting the menu item P5 othr TARE Press 5.1.bl Press 5.2.
8.6.3 Keyboard sound for pressed key bEEP no bEEP YES Keyboard sound is turned off Keyboard sound is turned on Operation: Display: Selecting the menu item P5 othr TARE 5.1.bl Press Repeatedly press appears until the following display TARE To change your selection, press To change your selection, press no . YES . PRINT Setting will be imported by pressing PLJ-GM-BA-e-1312 5.3.bEEP . 5.3.
8.6.4 Automatic cutout t1 YES t1 no Balance will be turned off, if weighing does not take place within 5 minutes. Balance is not turned off Operation: Display: Selecting the menu item P5 othr TARE 5.1.bl Press Repeatedly press appears 5.4.t1 until the following display TARE To change your selection, press . no To change your selection, press . YES PRINT Setting will be imported by pressing 5.4.t1 .
8.6.6 Charge display This function can be used to suppress the charge function. This suppresses the short illumination of the battery symbol if the balance is operated without battery or accumulator. (supply by power pack) The kind of supply is shown when the balance is started. SLA CHr6 YES SLA Function activated / SLA battery in use ATTENTION! Explosion hazard: For battery operation the setting must be no Operation: Display: Selecting the menu item P5 othr TARE 5.1.
8.7 P1 rEAd – basic settings 8.7.1 Filter settings This menu item allows the balance to be set according to specific ambient conditions and measuring purposes. OFF 1-4 Filter turned off Filter levels: 1 Sensitive and fast (very quiet set-up location). 4 Robust but slow (very busy set-up location) Operation: Display: Selecting the menu item P1 rEAd TARE 1.1.Fil Press TARE 1 Press To change your selection, press OFF 1 2 3 4 . PRINT Setting will be imported by pressing .
8.7.2 Auto Zero This function is used to tare small variations in weight automatically. 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. (e.g. slow flow of liquids from a container placed on the balance, evaporating processes). When apportioning involves small variations of weight, it is advisable to switch off this function.
8.7.3 Tare function This function enables individual selection of tare functions: Tara AtAr Tara tArF Automatic taring turned on, remains stored even after disconnection Tara no Automatic taring turned off, User can turn on automatic tare function via F6 AtAr and this will remain active until disconnection is carried out. (For description see chpt. 8.11) Taring, including storage of last tare value. Value is displayed showing minus sign when balance is started and as a NET symbol on the display.
8.7.4 Weighing value - averaging This filter function eliminates short-term changes of the weighing value (impulse). Weighing value - averaging Weighing value - averaging no Function turned off YES Function turned on Operation: Display: Selecting the menu item P1 rEAd TARE 1.1.Fil Press TARE Repeatedly press appears until the following display TARE To change your selection, press . YES .
8.8 Parts counting For instance, 10 identical pieces are weighed; from this follows 10 as a reference number of items. Then the average weight is given automatically by the balance. As of now the pieces to be counted will be shown as items. As a rule: The higher the reference quantity the higher the counting exactness. Explanations for the balance adjustment: The reference formation needs an exact determination of the weight value. In order to use counting function PcS must be enabled in menu P4.
For selection of FrEE follow sequence of operations below Enter random reference number of items FrEE PRINT FrEE 00000 Press TARE Use the key, to select the digit to be changed, the key is used to increase the numerical value (active digit flashing) 00015 Confirm entered reference number of items by pressing the LoAD pcs pcs PRINT button Place as many parts to count on the weighing plate as the set reference quantity requires. 15 PRINT Acknowledge by .
8.9 Tolerance weighing For tolerance weighing compare the current weight value to a lower and upper limit. These limits must have been stored beforehand. When placing for instance ready-made packaging, it will be shown whether the weight is within the allowable tolerance. Operation: Display: Selection of menu item P4 Func P4 Func TARE 4.1.FFun Press Press TARE anew the menu item set as last flashes PcS (Example) repeatedly until „HiLo“ is displayed flashing Press TARE 4.1.
PRINT , „0.0“ appears and „Min“ is Confirm by pressing displayed 0.0 g Place the test items, the entered tolerance range is displayed by „Min“, „OK“ and „Max“ The value entered for the upper tolerance limit must be greater than the lower tolerance value. Error message –Lo- appears on the display and the display returns to weighing mode. 8.10 Percent determination Percent determination allows weight display in percent, in relation to a reference weight. 8.10.
Put a reference weight which corresponds to 100% 35.8 g (Example) PRINT Acknowledge by , „100.00%“ appears 100.00 % Place the test item, the weight is displayed in % F Back to weighing mode by pressing the button. 56,9 % 35.8 g (Example) 8.10.2 Calculate the reference weight by numeric input Operation: Display: Selection of menu item P4 Func Press Press TARE P4 Func 4.1.
Enter the reference weight using TARE and PRINT , „0.0“ appears Confirm by pressing Place the test weight, the weight is displayed in percent 40.0 % 0.0 g 20.0 % 8.11 Automatic taring This function is to be used for faster calculation of the net weight, in case the tare load changes for each weighing. Operation: Display: Selection of menu item P4 Func TARE 4.1.
8.12 Storing maximum value of weight This function is to be used for the calculation of the maximum weight. During this process the maximum value will be displayed and stored. Is the weight reduced, the maximum value will continue to be shown. Operation: Display: Selection of menu item P4 Func Press Press TARE P4 Func 4.1.FFun TARE , the menu item set as last flashes PcS (Example) repeatedly until „toP“ is displayed flashing Press Press TARE 4.1.
8.13 Adding function This function is used to automatically add any number of single weighings to a total sum. Operation: Display: Selection of menu item P4 Func Press Press P4 Func TARE 4.1.FFun PcS TARE , the menu item set as last flashes (Example) Press Add repeatedly until „Add“ is displayed flashing Press TARE 4.1.FFun F SAVE? repeatedly until “SAVE?“ appears Press PRINT Confirm by pressing 0.0 g , „0.0“ appears F P , „0.
8.14 Animal weighing function The animal weighing function can be applied for busy weighing. During a defined period the mean value of the weighing results is formed. The more unquiet the weighed item, the longer the period should be selected. Operation: Display: Selection of menu item P4 Func Press Press P4 Func TARE 4.1.FFun PcS TARE , the menu item set as last flashes (Example) Press AnLS repeatedly until „AnLS“ is displayed flashing Press TARE 4.1.
8.15 Save the pretaring value Using this function the weight of a tare vessel is stored. Even after turning off/on the weighing balance will continue working with the saved tare value. Operation: Display: Selection of menu item P4 Func Press Press P4 Func TARE 4.1.FFun TARE , the menu item set as last flashes PcS (Example) repeatedly until „tArE“ is displayed flashing Press Press TARE 4.1.FFun F repeatedly until “SAVE?“ appears Press PRINT SAVE? , „0.0“ 0.
8.15.1 Call-up pretaring value from memory Operation: Display: F tArE 0 Call-up pretaring by pressing Call-up memory location using value has been stored tArE 1 where the pretaring PRINT Confirm by pressing , the pretaring value is displayed as negative value Place the test item, the net weight of the test item is displayed (Example) -5.0 g (Example) 35.
9 Data output RS 232 C 9.1 Technical data 7 / 8 data bits, 1 / 2 stop bit, no / even / odd parity bit Baud rate selectable at 2400, 4800, 9600, 19200 and 38400 Baud Miniature plug-in necessary (9 pole D-Sub) For operation with interface faultless operation is only ensured with the correct KERN – interface cable (max.
Meaning of settings: StAb rEPL CntA Cntb 9.3 data output for stable weighing value (PRINT key) automatic output function (See chpt. 9.
9.4 Baud rate for RS232 interface The baud rate is set as follows: Operation: Display: Selecting the menu item P2 Prnt TARE Press Press 2.1. Pr_n , „2.2.Pr_n“ appears repeatedly until 2.3. bAud appears TARE Press flashing , the Baud rate set as last will be shown and 9600 (Example) Select desired Baud rate by pressing . PRINT Acknowledge by . F Press 2.3. bAud repeatedly until “SAVE?“ appears PRINT Acknowledge by , „0.0“ 19200 38400 2400 4800 9600 2.3. bAud SAVE? 0.
9.
Data record format: Instru ction: Space / instr.: 3. Character Stability indicator Space Presign Weight Space Unit CR LF Instruction: 1. up to 3 signs In case of a 3 digit instruction use the next space. This will not affect the length of the data record. Stability indicator Space if stable, ? if not stable ^ if overload v if underload Sign: Space, if positive negative sign, if negative Weight: 9 signs, right justified Unit: 3 signs, left justified 9.5.
9.5.3 Continuous output The balance may be operated in a mode enabling continuous output of weighing results. This mode can be turned on/off by commands via RS232.
11 Service, maintenance, disposal 11.1 Cleaning Before cleaning, please disconnect the appliance from the operating voltage. Please do not use aggressive cleaning agents (solvents or similar agents), but a cloth dampened with mild soap suds. Ensure that no liquid penetrates into the device and wipe with a dry soft cloth. Loose residue sample/powder can be removed carefully with a brush or manual vacuum cleaner. Spilled weighing goods must be removed immediately. 11.
12 Instant help In case of an error in the program process, briefly turn off the balance and disconnect from power supply. The weighing process must then be restarted from the beginning. Help: Fault The displayed weight does not glow. Possible cause The balance is not switched on. The mains supply connection has been interrupted (mains cable not plugged in/faulty). Power supply interrupted. (Rechargeable) batteries are inserted incorrectly or empty No (rechargeable) batteries inserted.
