KERN PLJ Series Operating Manual
Analytical and precision balances
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Summary of Contents for KERN PLJ Series
- Page 1 KERN & Sohn GmbH Ziegelei 1 Phone: +49-[0]7433- 9933-0 D-72336 Balingen Fax: +49-[0]7433-9933-149 email: info@kern-sohn.com Internet: www.kern-sohn.com Operating Manual Analytical and precision balances KERN ALJ/ALS/PLJ/PLS Version 4.1 2017-07 ALJ/ALS/PLJ/PLS-BA-e-1741...
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Page 2: Table Of Contents
8.1.1 Adjustment with recommended adjustment weight (factory setting) ........38 8.1.2 Adjustment with weights of other nominal values ..............39 Models with internal weight (KERN ALJ/PLJ) ............41 8.2.1 Adjustment models PLJ-M ....................... 42 8.2.2 Overwrite internal adjustment weight ..................43 Verification ........................44... - Page 3 User menu ....................47 10.1 Weighing unit ......................50 10.2 Data output type .......................51 10.3 Baud rate ........................52 10.4 Auto Zero ........................53 10.5 Filter .........................55 10.6 Standstill control display ...................56 10.7 Setting the contrast of the display ................57 10.8 Display background illumination ................58 10.9 Automatic switch-off function „AUTO OFF“...
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Page 4: Technical Data
1 Technical Data KERN ALJ 160-4A ALJ 200-5DA Weighing range (max) 160 g 82 g / 220 g Readability (d) 0.1 mg 0.01 mg / 0.1 mg Reproducibility 0.1 mg 0.04 mg / 0.1 mg Linearity ± 0.3 mg ± 0.1 mg / 0.2 mg Stabilization time (typical) 4 sec. - Page 5 KERN 500-4A 250-4A 310-4A 510 g Weighing range (max) 250 g 310 g 0.1 mg Readability (d) 0.1 mg 0.1 mg 0.2 mg Reproducibility 0.1 mg 0.1 mg ± 0.4 mg Linearity ± 0.3 mg ± 0.3 mg 4 sec.
- Page 6 KERN ALJ 160-4AM ALJ 250-4AM ALJ 310-4AM Weighing range (max) 160 g 250 g 310 g Readability (d) 0.1 mg 0.1 mg 0.1 mg Reproducibility 0.1 mg 0.1 mg 0.1 mg Linearity ± 0.3 mg ± 0.3 mg ± 0.3 mg...
- Page 7 KERN ALS 160-4A ALS 250-4A Weighing range (max) 160 g 250 g Readability (d) 0.1 mg 0.1 mg Reproducibility 0.1 mg 0.1 mg Linearity ± 0.3 mg ± 0.3 mg Stabilization time (typical) 4 sec. 4 sec. Minimum unit weight at >...
- Page 8 KERN PLJ 310-3F PLJ 420-3F PLJ 720-3A Weighing range (max) 310 g 420 g 720 g Readability (d) 0.001 g 0.001 g 0.001 g Reproducibility 0.001 g 0.001 g 0.001 g Linearity ± 0.003 g ± 0.003 g ± 0.002 g Stabilization time (typical) 3 sec.
- Page 9 KERN 2000-3A 1200-3A 1200-3DA 3100-2F Weighing range (max) 720 g/ 1200 g 2100 g 3100 g 1200 g Readability (d) 0.001 g/ 0.001 g 0.001 g 0.01 g 0.01 g Reproducibility 0.001 g/ 0.001 g 0.002 g 0.01 g 0,01 g Linearity ±...
- Page 10 KERN PLJ 4200-2F PLJ 6200-2A PLJ 6200-2DA Weighing range (max) 4200 g 6200 g 4200 g /6200 g Readability (d) 0.01 g 0.01 g 0.01 g /0.1 g Reproducibility 0.02 g 0.01 g 0.01 g /0.1 g Linearity ± 0.04 g ±...
- Page 11 KERN PLJ 300-3FM PLJ 720-3AM Weighing range (max) 320 g 720 g Readability (d) 0.001 g 0.001 g Reproducibility 0.001 g 0.001 g Linearity ± 0.003 g ± 0.002 g Verification value (e) 10 mg 10 mg Verification class Minimum load (Min)
- Page 12 KERN PLJ 3000-2FM PLJ 6200-2AM Weighing range (max) 3100 g 6200 g Readability (d) 0.01 g 0.01 g Reproducibility 0.01 g 0.01 g Linearity ± 0.03 g ± 0.02 g Verification value (e) 100 mg 100 mg Verification class Minimum load (Min)
- Page 13 KERN PLS 310-3F PLS 420-3F PLS 510-3A Weighing range (max) 310 g 420 g 510 g Readability (d) 0.001 g 0.001 g 0.001 g Reproducibility 0.002 g 0.002 g 0.001 g Linearity ± 0.003 g ± 0.004 g ± 0.002 g Stabilization time (typical) 3 sec.
- Page 14 KERN PLS 720-3A PLS 1200-3A PLS 1200-3DA Weighing range (max) 720 g /1,200 g 720 g 1200 g Readability (d) 0.001 g /0.01 g 0.001 g 0.001 g Reproducibility 0.001 g /0.01 g 0.001 g 0.001 g Linearity ± 0.002 g / 0.02 g ±...
- Page 15 KERN PLS 3100-2F PLS 4200-2F PLS 4200-2A Weighing range (max) 3100 g 4200 g 4200 g Readability (d) 0.01 g 0.01 g 0.01 g Reproducibility 0.02 g 0.02 g 0.01 g Linearity ± 0.03 g ± 0.04 g ± 0.02 g Stabilization time (typical) 3 sec.
- Page 16 KERN PLS 6200-2A PLS 6200-2DA Weighing range (max) 6200 g 4200 g/6200 g Readability (d) 0.01 g 0.01 g/0.1 g Reproducibility 0.01 g 0.01 g/0.1 g Linearity ± 0.03 g ± 0.02 g / 0.2 g Stabilization time (typical) 2 sec.
- Page 17 PLS 20000-1F KERN PLS 8000-2A Weighing range (max) 8200 g 20 kg Readability (d) 0.01 g 0.1 g Reproducibility 0.01 g 0.1 g Linearity ± 0.03 g ± 0.4 g Stabilization time (typical) 2 sec. 3 sec. Minimum unit weight at >...
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Page 18: Declaration Of Conformity
2 Declaration of Conformity To view the current EC/EU Declaration of Conformity go to: www.kern-sohn.com/ce The scope of delivery for verified weighing balances (= conformity- rated weighing balances) includes a Declaration of Conformity. ALJ/ALS/PLJ/PLS-BA-e-1741... -
Page 19: Device Overview
3 Device overview 3.1 Components Model ALJ 200-5D Pos. Designation Pos. Designation Glass windshield Bubble level Wind protection ring RS232 Display Foot Keyboard Device sticker Foot screw Mains adapter connection Electronic box Model ALJ 200-5D with installed ionizator (KERN AEJ-A03) ALJ/ALS/PLJ/PLS-BA-e-1741... - Page 20 Front side of the balances Model ALJ / ALS / PLJ 2000-3A Pos. Designation Glass wind screen Weighing pan Display Keyboard Foot screw Bubble level ALJ/ALS/PLJ/PLS-BA-e-1741...
- Page 21 Models PLJ / PLS: Dimensions weighing plate Ø 110 mm Pos. Designation Cover glass wind screen Glass wind screen Weighing plate Display Keyboard Foot screw ALJ/ALS/PLJ/PLS-BA-e-1741...
- Page 22 Models PLS Model PLS 20000-1F Dimensions weighing plate plate Ø 160 mm Dimensions weighing 200 x 175 mm Pos. Designation Bubble level Weighing plate Display Keyboard Foot screw ALJ/ALS/PLJ/PLS-BA-e-1741...
- Page 23 Back and bottom side of the balance 1. Weighing plate 2. RS232C interface 3. Foot screws 4. Mains adapter connection 5. Housing screws (in models with four feet first screw out the two rear feet) 6. Underfloor weighing device ALJ/ALS/PLJ/PLS-BA-e-1741...
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Page 24: Operating Elements
3.2 Operating elements 3.2.1 Overview of display Icon Designation Stability display Indicator “zero display” Application <Calculation of percentage> Application <Parts counting> Loading status rechargeable battery, see chap. 8.8 Balance is in input mode Upper tolerance limit Lower tolerance limit Application <Density> Brackets to display non verified ciphers (only verified balances) Weighing Units ALJ/ALS/PLJ/PLS-BA-e-1741... -
Page 25: Keyboard Overview
3.2.2 Keyboard overview Designation Short key pressing Longtime pressed button until the acoustic signal gets mute • Call-up application MENU button/ menu • Call-up user menu • Select menu items – • Exit user menu scroll forward Arrow button • numerical input – scroll backward •... -
Page 26: Basic Information (General)
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. In KERN’s accredited DKD calibration laboratory test weights and balances may be... -
Page 27: Basic Safety Precautions
5 Basic Safety Precautions 5.1 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. Versions in other languages are non-binding translations. The only binding version is the original document in German. -
Page 28: Packaging / Return Transport
6.2 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. ... - Page 29 Illustration example Analytical balances: ALJ/ALS/PLJ/PLS-BA-e-1741...
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Page 30: Unpacking, Setup And Commissioning
7 Unpacking, Setup and Commissioning 7.1 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. Therefore, observe the following for the installation site: •... -
Page 31: Placing
7.2.1 Placing The right place is decisive for the accuracy of the weighing results of high- resolution analytical and precision balances (see chap. 8.1). Assembly of the balance Model ALJ 200-5A Insert grid weighing plate Place wind protection ring Connect balance to electronic box. - Page 32 Fix connection using screws Plug in mains adapter ALJ/ALS/PLJ/PLS-BA-e-1741...
- Page 33 Models ALS/ALJ Models PLS/PLJ, d = 1 mg ALJ/ALS/PLJ/PLS-BA-e-1741...
- Page 34 Models PLS/PLJ, d = 100 mg Models PLS/PLJ, d = 10 mg ALJ/ALS/PLJ/PLS-BA-e-1741...
- Page 35 Levelling Exact alignment and stable installation are an essential requirement for repeatable results. You can compensate for minor unevenness or tilts of the footprint by levelling the weighing balance. Level the balance with foot screws [1] until the air bubble in the bubble level is in the prescribed circle.
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Page 36: Mains Connection
Check, whether the voltage acceptance on the scales is set correctly. Do not connect the scales to the power mains unless the information on the scales (sticker) matches the local mains voltage. Only use KERN original mains adapter. Using other makes requires consent by KERN. Important: ... -
Page 37: Rechargeable Battery Operation (Depends On Model, See Chp.1)
Before connecting or disconnecting of additional devices (printer, PC) to the data interface, always disconnect the balance from the power supply. With your balance, only use accessories and peripheral devices by KERN, as they are ideally tuned to your balance. -
Page 38: Adjustment
Observe stable environmental conditions. A warming up time (see chapter 1) is required for stabilization. Ensure that there are no objects on the weighing plate. 8.1 Models with external weight (KERN ALS/PLS) • The adjustment is locked for verified balances. -
Page 39: Adjustment With Weights Of Other Nominal Values
Weights of different nominal values may be used for adjustment but are not optimal for technical measuring, possible adjustment points see table 1. Info about adjustment weights can be found on the Internet at: http://www.kern- sohn.com Ensure that there are no objects on the weighing plate. Press the CAL button and keep it pressed until the acoustic signal gets mute. - Page 40 Recommended Other measurement-technically not optimal nominal Model adjustment weight values for adjustment (see chap. 7.1.2) (see chap. 7.1.1). A-models ALS 160-4A 150g 100g ALS 250-4A 200g 100g PLS 510-3A 500g 100g, 200g, 300g, 400g PLS 720-3A 600g 100g, 200g, 300g, 400g, 500g PLS 1200-3A 1000g PLS 1200-3DA...
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Page 41: Models With Internal Weight (Kern Alj/Plj)
8.2 Models with internal weight (KERN ALJ/PLJ) For non verified balances four adjustment possibilities are available in the menu. In weighing mode press the MENU button and keep it pressed until Menu settings the acoustic signal gets mute. The first menu item „units“ is displayed. -
Page 42: Adjustment Models Plj-M
When the I-CAL function is activated, the internal adjustment is I-CAL started only by pressing the CAL button. Before pressing CAL ensure that there are no objects on the weighing plate. At the models with internal adjustment weight the adjustment with E-CAL external weight is not recommended. -
Page 43: Overwrite Internal Adjustment Weight
8.2.2 Overwrite internal adjustment weight (Models with settings not appropriate for verification only) Overwriting is restricted to specialist staff possessing well acquainted with the workings of weighing scales. Press the MENU button and keep it pressed until the acoustic signal gets mute. ... -
Page 44: Verification
8.3 Verification General introduction: According to EU directive 90/384/EEC balances must be verified if they are used as follows (legally controlled area): a) For commercial transactions if the price of goods is determined by weighing. b) For the production of medicines in pharmacies as well as for analyses in the medical and pharmaceutical laboratory. -
Page 45: Basic Operation
9 Basic Operation In stand-by mode (see chap. 6.5) press ON/OFF button. Start-up The balance is ready for weighing when the weight display appears. For models PLJ-M “Wait 30“ appears on the display. The weighing balance requires 30 minutes to reach stabilisation. Afterwards it will automatically change into weighing mode at which point it will be ready for operation. -
Page 46: Underfloor Weighing
9.1 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 the balance • Open closing cover (1) at the balance bottom. •... -
Page 47: User Menu
10 User menu The settings of the balance can be changed in the user menu. This way, the balance can be adjusted to individual weighing requirements. By the factory the user menu has been set in a way that normally no more changes must be made, only at special conditions of use. - Page 48 Menu overview Menu item Display Selection Description Weighing unit Gramm Units Gram (see chap. 11.1) Carat * Carat Unze * Ounce Pound * Pound Pennyweight * PEnn Troy Unze * OuncEtr Grain * GrAin Tael Hongkong * tAEL Hon Tael Singapore * tAEL SGP Tael R.O.C.
- Page 49 Standstill control display Standstill control fast – very Stabil Stab 1 (see chap. 11.6) quiet set-up location Standstill control fast + exact – Stab 2 quiet set-up location Standstill control exact – very Stab 3 set-up location Contrast of the display (see chap.
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Page 50: Weighing Unit
10.1 Weighing unit According to requirements the balance can be switched-over into different units (in verified balances not all the units are available, see chap. 1 „Technical specifications). Selected weighing unit will be retained even after disconnection from the mains. ... -
Page 51: Data Output Type
10.2 Data output type In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Press MENU button Acknowledge using PRINT button, the current setting is displayed. Press the arrow keys to select desired setting. Scroll forward using MENU button Scroll backward using CAL button ... -
Page 52: Baud Rate
10.3 Baud rate In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Press MENU button repeatedly Acknowledge using PRINT button, the current setting is displayed. Press the arrow keys to select desired setting. Scroll forward using MENU button Scroll backward using CAL button ... -
Page 53: Auto Zero
10.4 Auto Zero Under this menu item the automatic zero point correction can be switched on or off. In switched-on-state the zero point is automatically corrected at drift or when dirty. Information: 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“... - Page 54 Press the arrow keys to select desired setting. Scroll forward using MENU button Scroll backward using CAL button = Auto Zero switched off Au0 OFF = Auto Zero range ± ½ digit Au0 1 = Auto Zero range ± 3 digits Au0 2 = Auto Zero range ±...
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Page 55: Filter
10.5 Filter This menu item allows the balance to be set according to specific ambient conditions and measuring purposes. In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Press MENU button repeatedly ... -
Page 56: Standstill Control Display
10.6 Standstill control display In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Press MENU button repeatedly Acknowledge using PRINT button, the current setting is displayed. Press the arrow keys to select desired setting. Scroll forward using MENU button Scroll backward using CAL button STAB 1: Standstill control fast –... -
Page 57: Setting The Contrast Of The Display
10.7 Setting the contrast of the display To set the contrast of the display you can choose between 15 values. In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Press MENU button repeatedly ... -
Page 58: Display Background Illumination
10.8 Display background illumination In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Press MENU button repeatedly Acknowledge using PRINT button, the current setting is displayed. Press the arrow keys to select desired setting. Scroll forward using MENU button Scroll backward using CAL button Background illumination on... -
Page 59: Automatic Switch-Off Function „Auto Off" In Stand-By Mode
10.9 Automatic switch-off function „AUTO OFF“ in stand-by mode In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. Press MENU button repeatedly Acknowledge using PRINT button, the current setting is displayed. ... -
Page 60: User Menu
11 User menu The following operating modes may be enabled/disabled in the user menu: Parts counting Count Density determination of solids/liquids Dens Adding function Checkweighing Percent determination Perc Animal weighing function Anim Peak value function M Load ... -
Page 61: Parts Counting
11.1 Parts counting Before the balance can count parts, it must know the average part weight (i.e. reference). Proceed by putting on a certain number of the parts to be counted. The balance determines the total weight and divides it by the number of parts, the so- called reference quantity. - Page 62 If it was impossible to determine a reference due to instable goods to be weighed or an insufficient reference weight, the following display will appear during reference calculation. ERR04 = smallest counting weight not achieved Add SMP=if the placed quantity for a correct reference determination is too small, more parts must be placed as follows.
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Page 63: Switching Over Between Quantity And Weight Display
11.1.1 Switching over between quantity and weight display Place load on pan and read the number of pieces. Press MENU button, the total weight of the placed parts is displayed. Press the MENU button and keep it pressed until the acoustic signal gets mute, the average weight of a single piece is displayed. -
Page 64: Numeric Entering Of The Reference Weight
11.1.3 Numeric entering of the reference weight If you know the reference weight/piece you can enter this via the numeric keyboard. In weighing mode press MENU button. The first menu item „count“ is displayed. Acknowledge using PRINT button, the current reference quantity is displayed. ... -
Page 65: Density Determination With The Help Of An Underfloor Weighing Device
] of that liquid is known (principle of Archimedes). The use of an optionally available density determination set facilitates your work when determing the density Analytical balances KERN YDB-03 Precision balances [d] = 0.001 g KERN ALT-A02 Precision balances [d] = 0.01 g KERN PLT-A01 11.2.1 Density determination of solids... - Page 66 The display for weight determination of the "sample in air“ appears. Confirm by pressing the PRINT button. If necessary, tare and put the sample. Wait until the weight display of the weighing balance has become stable and then press the PRINT button.
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Page 67: Determining Density Of Liquids
11.2.2 Determining density of liquids Fill sample liquid into a vessel, e.g. a pitcher. Heat sample liquid until temperature is constant. Prepare a glass sinker with known density In weighing mode press MENU button. The first menu item „count“ is displayed. ... - Page 68 The display for weight determination of the "glass sinker in air“ appears. Confirm by pressing the PRINT button. Tare if necessary and hook on the glass sinker centrically. Wait until the weight display of the weighing balance has become stable and then press the PRINT button.
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Page 69: Adding Function
11.3 Adding function This function can be used to automatically add any number of single weighings to a total. Press repeatedly the MENU button in weighing mode until „add“ will be displayed. Confirm by pressing the PRINT button The balance will tare automatically and then will change to the zero display ... - Page 70 The displayed value is added into the total adding memory, after that the balance will automatically tare anew and change over to the zero display Proceed in the same manner with the other weights To print out the total sum of the single weighings, press the CAL button ...
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Page 71: Checkweighing
11.4 Checkweighing An upper and a lower limit value can be established to ensure that the weighed goods are exactly within the established tolerance limits. The display [L], [ok] or [H] shows whether the goods to be weighed are within the two tolerance limits. - Page 72 Signal tone switched off Beep off Signal tone on, if weighed goods are within tolerance range Beep on Confirm by pressing the PRINT button. The balance is now in checkweighing mode. Put on goods to be weighed, tolerance control is started Return to weighing mode ...
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Page 73: Percent Determination
11.5 Percent determination Percent determination allows weight display in percent, in relation to a reference weight. 11.5.1 Entering the reference weight by weighing In weighing mode press MENU button. The first menu item „count“ is displayed. Press MENU button repeatedly ... -
Page 74: Numeric Entering Of The Reference Weight
11.5.2 Numeric entering of the reference weight In weighing mode press MENU button. The first menu item „count“ is displayed. Press MENU button repeatedly Acknowledge using PRINT button, the current setting is displayed. Using MENU button select „PErc n“ ... -
Page 75: Animal Weighing Function
11.6 Animal weighing function The animal weighing function can be applied for busy weighings. 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. ... -
Page 76: Peak Value Function
11.7 Peak value function This function displays the highest load value (peak value) of a weighing. The peak value remains in the display until it will be deleted. In weighing mode press MENU button. The first menu item „count“ is displayed. ... -
Page 77: Data Output Rs 232C
Baud rate optional from 1200 - 9600 Baud • For operation with interface faultless operation is only ensured with the correct • KERN – interface cable (max. 2m) 12.2 Pin allocation of balance output plug Pin 2 Tx Signal Pin 3... -
Page 78: Interface
12.3 Interface • Balance – PC 25-pole Balance • Balance – PC 9-pole Balance • Balance - printer Printer Balance Data input Busy Signal 12.4 Data transfer The data set consists of the following 14 characters: 1. Character sign -/ blank (weighing value) 2-9. -
Page 79: Format For Data Transmission
12.5 Format for data transmission At stable weight the format is transferred after pressing the PRINT button. Weighing mode (continuous output and remote control command) 1° 2° 3° 4° 5° 6° 7° 8° 9° 10° 11° 12° 13° 14° 15°r Character Weight Weighing unit... - Page 80 Percent determination (only remote control command) Percent value 1° 2° 3° 4° 5° 6° 7° 8° 9° 10° 11° 12° 13° 14° 15° 16° 17° 18° Blank Percent Blank Percent Weight value 1°. 2° 3° 4° 5° 6° 7° 8° 9°...
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Page 81: Remote Control Instructions
• Use a suitable cable to connect the weighing balance to the interface of the printer. Faultless operation requires an adequate KERN interface cable. • The Baud rates of balance and printer must agree, see chap. 9.3. - Page 82 Percent determination Perc. 20 % Weight: 30.000 g Perc Display value in [%] Weight Display value in [g] Animal weighing mode Time 6 Sec Ave.: 59.446 g Add-up mode 14.156 g 18.226 g 32.382 g Tolerance weighing Weight : 0.00g Weight : 49.20g Weight : 249.20g -LOW-...
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Page 83: Error Messages
Loose residue sample/powder can be removed carefully with a brush or manual vacuum cleaner. Spilled weighing goods must be removed immediately. 14.2 Service, maintenance The appliance may only be opened by trained service technicians who are authorized by KERN. Before opening, disconnect from power supply. ALJ/ALS/PLJ/PLS-BA-e-1741... -
Page 84: Disposal
14.3 Disposal Disposal of packaging and appliance must be carried out by operator according to valid national or regional law of the location where the appliance is used. 15 Instant help In case of an error in the program process, briefly turn off the balance and disconnect from power supply.
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