KERN & Sohn GmbH Ziegelei 1 D-72336 Balingen email: info@kern-sohn.com Phone: +49-[0]7433- 9933-0 Fax: +49-[0]7433-9933-149 Internet: www.kern-sohn.com Operating Manual Precision balances KERN PLE-N Version 2.
GB KERN PLE-N Version 2.2 02/2012 Operating Manual Precision balances Table of Contents 1 Technical Data ............................................................................................... 4 2 Declaration of conformity ............................................................................. 5 3 Basic Information (General) .......................................................................... 6 3.1 Proper use ......................................................................
8 Basic Operation ........................................................................................... 15 9 User menu .................................................................................................... 16 9.1 Weighing unit ..........................................................................................................19 9.2 Data output type .....................................................................................................20 9.3 Baud rate ........
1 Technical Data KERN PLE 420-3N PLE 4200-2N 420 g 4200 g Readability (d) 0.001 g 0.01 g Reproducibility 0.002 g 0.02 g ± 0.004 g ± 0.04 g 2 sec 2 sec 0.005 g 0.
2 Declaration of conformity KERN & Sohn GmbH D-72322 Balingen-Frommern Postbox 4052 email: info@kern-sohn.de Phone: 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.
4 Basic Safety Precautions 4.1 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. 4.2 Personnel training The appliance may only be operated and maintained by trained personnel. 5 Transportation & Storage 5.1 Testing upon acceptance When receiving the appliance, please check packaging immediately, and the appliance itself when unpacking for possible visible damage. 5.
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.
6.3 Appliance overview 1. Weighing plate 2. RS232C interface 3. Foot screws 4.
6.4 Controls 6.4.1 Overview of display 6.4.
6.5 Connect and switch-on power supply Before connecting the mains adapter check if the printed voltage value is the same as the local supply voltage. Only use KERN original mains adapter. Using other makes requires consent by KERN. Plug-in mains adapter in mains adapter bushing of the balance and connect to the mains. The balance will carry out a self-test Then the balance is set into stand-by mode. . Press the ON/OFF key. When the zero display appears, the balance is ready for operation.
6.7 Connection of peripheral devices 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. 6.8 Initial Commissioning In order to obtain exact results with the electronic balances, your balance must have reached the operating temperature (see warming up time chap. 1).
7.1.1 Adjustment with recommended adjustment weight (factory setting) Weight value of the required adjustment weight see chpt. 1 “Technical specifications“: Ensure that there are no objects on the weighing plate. Press the CAL key Wait until the weighed value for the required adjustment weight appears flashing. During the flashing display put the required adjustment weight carefully in the center of the weighing plate. The flashing display disappears.
7.1.2 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.kernsohn.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. Wait until „load“ appears.
8 Basic Operation Start-up In stand-by mode press ON/OFF button. The balance is ready for weighing when the weight display appears. . Switching Off Press ON/OFF button, the balance returns to the stand-by mode. Simple weighing Place goods to be weighed on balance Wait until the stability display appears [] Read weighing result. Taring Place the weighing box and press the TARE button. „0-t“ is displayed. After standstill control the zero display appears.
9 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. Navigation in the menu Access to menu In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. The first menu item „units“ is displayed.
Menu overview Menu item Weighing unit (see chap. 9.1) Display Units Selection Gram Gramm Carat Carat Ounce Unze Pound Pound PEnn Pennyweight OuncEtr GrAin Data output type (see chap. 9.2) PC-Prtr baud rt Troy Unze Grain tAEL Hon Tael Hongkong tAEL SGP Tael Singapore tAEL roc Tael R.O.C. Momme Momme PC cont Continuous output PC CMd Manual issue after pressing the PRINT button Print Baudrate (see chap. 9.
Backlight (see chap. 9.7) AUTO OFF in stand-by mode (see chap. 9.8) Adjustment (see chap. 7) Blt time off Calib on Backlight on off Backlight off Auto Backlight automatically switched off 3 seconds after achieving stable weighing value. Changes in weight or pressing of keys will automatically result in backlight switching on again.
9.1 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. In weighing mode press the MENU button and keep it pressed until the acoustic signal gets mute. The first menu item „units“ is displayed. Acknowledge using PRINT button, the current setting is displayed.
9.2 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 „PC cont“ = Continuous output „PC CMd“ = Manual issue after pressing the PRINT button „Print“ = not documented Take over selection using the PRINT button.
9.3 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 Take over selection using the PRINT button. Weighing balance returns to menu. Either make more settings in the menu or go back to weighing mode as follows.
9.4 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“ in the balance. (e.g. slow flow of liquids from a container placed on the balance, evaporating processes).
Press the arrow keys to select desired setting. Scroll forward using MENU button Scroll backward using CAL button Au0 OFF Au0 1 Au0 2 Au0 3 Au0 3E = Auto Zero switched off = Auto Zero range ± ½ digit = Auto Zero range ± 3 digits = Auto Zero range ± 7 digits = Auto Zero range ± 7 digits in the whole weighing range Take over selection using the PRINT button. Weighing balance returns to menu. Either make more settings in the menu or go back to weighing mode as follows.
9.5 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 Acknowledge using PRINT button, the current setting is displayed. Press the arrow keys to select desired setting.
9.6 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.
9.7 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.
9.8 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. Press the arrow keys to select desired setting.
10 User menu The following operating modes may be enabled/disabled in the user menu: Count Parts counting Dens Density determination of solids/liquids HoL Checkweighing Perc Percent determination M Load Peak value function End Navigation in the menu Access to menu In weighing mode press MENU button. The first menu item „count“ is displayed. How to select menu items Using the MENU button the individual menu items can be selected one after the other.
10.1 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 socalled reference quantity. Counting is then carried out on the basis of the calculated average piece weight. As a rule: The higher the reference quantity the higher the counting exactness. In weighing mode press MENU button.
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. Place more parts, but at least the double quantity. Press the PRINT button, the reference weight is calculated anew.
10.1.1 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. or Press the MENU button and keep it pressed until the acoustic signal gets mute, the average weight of a single piece is displayed. Back to quantity display press MENU button again. 10.1.2 Automatic reference optimization In order to improve the counting exactness, the reference can be optimised by adding more pieces.
10.1.3 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. Press the arrow buttons to select the parameters manually. Press the arrow buttons to enter the known reference weight. If using a weighing container, put this before pressing the PRINT button.
10.2 Density determination (Hydrostatic weighing) Density is the relationship of weight [g] : volume [cm 3]. The weight is determined by weighing the sample in air. The volume results from the ascending force [g] of the sample dipped in a liquid. The density [g/cm3] of that liquid is known (principle of Archimedes). The density is determined with help of the underfloor weighing device. 10.2.
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. „WEI AIR“ appears flashing. The display for weight determination of the "sample in the measuring fluid“ appears.
10.2.2 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. Press MENU button Acknowledge using PRINT button, the current setting is displayed. Using MENU button select „d Liquid“ Confirm by pressing the PRINT button. Use the arrow buttons to enter density of the glass sinker.
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. „WEI AIR“ appears flashing. The display for weight determination of the "glass sinker in sample liquid“ appears.
10.3 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.
Select the desired settings by pressing the MENU button Beep off Signal tone switched off Beep on Signal tone on, if weighed goods are within tolerance range Confirm by pressing the PRINT button. The balance is now in checkweighing mode.
10.4 Percent determination Percent determination allows weight display in percent, in relation to a reference weight. 10.4.1 Entering the reference weight by weighing 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 A“ If using a weighing container, put this before pressing the PRINT button. The taring process is automatically started.
10.4.2 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“ Confirm using the PRINT button, the display to enter the reference weight appears. Press the arrow buttons to enter the reference weight (100%). Confirm input by pressing the PRINT button.
10.5 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. Press MENU button repeatedly Confirm using PRINT button, the taring process is automatically started. „0-t“ is displayed. From here the balance is in peak value mode, where a „M” pops up. Load weighing plate. The maximum load value is displayed.
11 Data output RS 232C RS232C 11.1 Technical Data 8-bit ASCII Code 8 data bits, 1 stop bit, no parity bit Baud rate optional from 1200 - 9600 Baud For operation with interface faultless operation is only ensured with the correct KERN – interface cable (max. 2m) 11.
11.3 Interface Balance – PC 25-pole Balance PC 2 3 3 2 5 7 Balance – PC 9-pole Balance PC 2 2 3 3 5 5 Balance - printer Balance 2 5 Printer Data input GND 11.4 Data transfer The data set consists of the following 14 characters: 1. Character sign -/ blank (weighing value) 2-9. Character weight or other data 10-12. Character weighing unit 13. Character stability display 14. Character carriage return 15.
11.5 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° Character 6° 7° 8° 9° 10° Weight 11° 12° Weighing unit 13° 14° 15°r Stability CR LF Density determination (only remote control command) 1° 2° 3° 4° 5° 6° 7° 8° 9° 10° d = Density Blank 11° 12° 13° 14° 15° Weighing unit 16° 17° CR Counting (only remote control command) Number of pieces 1°.
11.6 Remote control instructions Instruction: Function “T” = H54 Taring “C” = H43 Adjustment “E” = H45 Enter “M” = H4D Menu “O” = H4F ON/OFF 11.7 Printer mode The following conditions must be met to provide successful communication between the weighing balance and the printer. 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.
Printout examples: Weighing mode/peak value function ………. 22.000 g Density determination d= 2.80066 g/cm3d d Measuring value „Density“ Parts counting Pcs Weight: PMU: 100 300.000 g 3.000 g PCS Number of pieces Weight Weight of placed pieces PMU Average parts weight Percent determination Perc. Weight: 20 % 30.
12 Error messages ERR01 Weight value instable or zeroing not possible. Check the environmental conditions. ERR02 Adjustment error, e.g. environmental conditions instable ERR03 Adjustment error e.g. incorrect adjustment weight} ERR04 Piece weight too small/instable ERR05 ERR06 “UNLOAD”: “CAL But” Data transfer not possible, as weighing value is instable. Check the environmental conditions. Weighing value in density determining mode instable. Check the environmental conditions.
14 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. The displayed weight is permanently changing Possible cause The balance is not switched on. The mains supply connection has been interrupted (mains cable not plugged in/faulty). Power supply interrupted.
