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 balances KERN 440 Version 4.
GB KERN 440 Version 4.4 2017-10 Operating Manual Compact balance Table of Contents 1 Technical Data ............................................................................................... 4 2 Declaration of conformity ............................................................................. 7 3 Basic Information (General) .......................................................................... 8 3.1 3.2 3.3 3.4 Proper use ...............................................................
9 Menu ............................................................................................................. 20 9.1 9.2 9.3 Navigation in the menu .......................................................................................................... 20 Menu overview ........................................................................................................................ 23 Description of individual menu items .....................................................................
1 Technical Data KERN 440-21N 440-21A 440-33N Readability (d) 0.001 g 0.001 g 0.01 g Weighing range (max) 40 g 60 g 200 g Taring range (subtractive) 40 g 60 g 200 g 0.001 g 0.001 g 0.01 g ± 0.003 g ± 0.003 g ± 0.02 g Minimum unit weight at piece counting 0.002 g 0.002 g 0.
KERN 440-35N 440-35A 440-43N 440-45N Readability (d) 0.01 g 0.01 g 0.1 g 0.1 g Weighing range (max) 400 g 600 g 400 g 1000 g Taring range (subtractive) 400 g 600 g 400 g 1000 g Reproducibility 0.01 g 0.01 g 0.1 g 0.1 g ± 0.03 g ± 0.03 g ± 0.2 g ± 0.2 g Minimum unit weight at piece counting 0.02 g 0.02 g 0.2 g 0.
KERN 440-47N 440-49N 440-49A 0.1 g 0.1 g 0.1 g Weighing range (max) 2000 g 4000 g 6000 g Taring range (subtractive) 2000 g 4000 g 6000 g 0.1 g 0.1 g 0.1 g ± 0.2 g ± 0.3 g ± 0.3 g 0.2 g 0.2 g 0.2 g 30 minutes 2 hours 2 hours Readability (d) Reproducibility Linearity Minimum unit weight at piece count Warm-up time Reference unit weights at piece count Weighing Units Recommended adjustment weight, not added (class) 5, 10, 25, 50 Details „Weighing units“ chapter 9.
KERN 440-51N 440-53N 440-55N 1g 1g 0.2 g Weighing range (max) 4000 g 6000 g 6000 g Taring range (subtractive) 4000 g 6000 g 6000 g 1g 1g 0.2 g ±2g ±2g ± 0.6 g 2g 2g 0.4 g 10 minutes 30 minutes 2 hours Readability (d) Reproducibility Linearity Minimum unit weight at piece count Warm-up time Reference unit weights at piece count 5, 10, 25, 50 Weighing Units Details „Weighing units“ chapter 9.
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. Versions in other languages are non-binding translations. The only binding version is the original document in German. 4.2 Personnel training The appliance may only be operated and maintained by trained personnel. 5 Transportation & Storage 5.
Major display deviations (incorrect weighing results) may be experienced should electromagnetic fields (e.g. due to mobile phones or radio equipment), static electricity accumulations or instable power supply occur. Change location or remove source of interference. 6.2 Unpacking / setup Carefully remove the balance from the packaging, remove plastic cover and setup balance at the intended workstation. The balance must be installed in a way that the weighing plate is exactly in horizontal position.
6.4 Operation using a (rechargeable) battery (optional) Lift-off the battery cover on the lower side of the balance. Connect 9 V compound battery. Replace the battery compartment cover. For battery operation the balance has an automatic switch-off function which can be activated or deactivated in the menu (chapter 9). In weighing mode keep the PRINT-key pressed until [Unit] appears. Press MODE key repeatedly until „AF“ appears. Use the SET key, to confirm.
6.6 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). During this warming up time the balance must be connected to the power supply (mains, accumulator or battery). The accuracy of the balance depends on the local acceleration of gravity. Strictly observe hints in chapter Adjustment. 6.
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 the balance • Open closing cover at the balance bottom. • Suspend hook for underfloor weighing carefully and completely. • Place weighing balance over an opening. • Attach load to hook and carry out weighing procedure. Fig.
7 Operation elements 7.
8 Basic Operation Start-up ON OFF Switching Off Press ON button. The balance will carry out a self-test The balance is ready for weighing when the weight display appears. Press OFF button, the display disappears ON OFF Weighing Place goods to be weighed on balance Wait for standstill control, after the standstill control, the weighing unit appears right hand in the display (e.g. g or kg) Read weighing result.
Weigh the material, the net weight will be indicated. The taring process can be repeated any number of times, e.g. when adding several components for a mixture (adding). The limit is reached when the whole weighing range is exhausted. The weight of the weighing container will be displayed as a minus number after removing the weighing container. The tare weight is saved until it is deleted.
Plus/minus weighings TA R E For example unit weight control, fabrication control etc. Put the nominal weight on the weighing plate and tare using the TARE button. Remove the nominal weight Put the test objects subsequently on the weighing plate, the respective deviation from the nominal weight is displayed with the respective sign to „+“ and „-“. According to the same procedure also packages with the same weight can be produced, referring to a nominal weight.
• Back to weighing mode by pressing the MODE button. • Error message „Er 1“ Piece below minimum weight of piece (See chpt. 1 “Technical specifications“): Press MODE key and restart reference determination. • Taring The tare vessels can also be used for piece counting. Before starting piece counting use the TARE button to tare out the container.
Percent determination Percentage calculation facilitates weight display in percent related to a reference weight equivalent to 100 %. In weighing mode press MODE key repeatedly, until [100 %] is displayed. MODE CAL SET M 440-BA-e-1744 Put a reference weight which corresponds to 100 %. Store by pressing the SET key. Remove reference weight. Place goods to be weighed on balance. The weight of the sample is displayed in percentage in terms of the reference weight.
9 Menu 9.1 Navigation in the menu Access to menu P R IN T In weighing mode keep the PRINT key pressed until [Unit] appears. How to select menu items MODE CAL Using the MODE key the individual menu items can be selected one after the other. How to change settings SET M Acknowledge selected menu item using SET key, the current setting is displayed. MODE CAL Change the settings using the MODE key. At any pressing of the MODE key, the next setting is displayed, see chapter 9.2 „Menu Overview“. 1.
2. Change settings of several menu items SET M Acknowledge selected menu item using SET key, the current setting is displayed. Use the MODE key to change settings. MODE CAL TA R E Press the TARE key, „Exit“ is displayed. Either SET M Acknowledge with SET key (yes), „StorE“ is displayed.
Save/reject and exit the menu SET M Save SET M Reject Either Any changes carried out are stored by pressing the SET key (yes). The balance returns automatically into weighing mode. or P R IN T To cancel changes, press the PRINT key (no). The balance returns automatically into weighing mode.
9.2 Menu overview Description of function Function Parameter Description of options Weighing units switching over (see chapter 9.3). UNIT g* kg oz ozt lb tlh tlt gn Gram Kilogram (dependent on model) Pound Ounce Troy ounce Tael Hongkong Tael Taiwan Grain (dependent on model) Pennyweight (dependent on model) Momme Tola Carat (dependent on model) Freely selectable factor Data output via remote control commands (see chapter 10.3) Data output by pressing the PRINT key (see chapter 10.
Baud rate bAUd (see chapter 9.4). Auto off (battery operation), see chap. 6.4 19200 9600* 4800 2400 1200 AF on* off Auto Zero (see chapter 9.3) Selection adjustment weight (see chapter 9.3) Filter function (see chapter 9.3), only models 440-21A, 440-35A, 440-49A Background illumination of the display, (see chap. 9.3) tr CAL StAbiL on* off 100 200 300 1 2 bL 3 on* off CH Animal weighing function (see chapter 9.3) Reset to factory setting (see chap. 9.
9.3 Description of individual menu items Weighing Units In weighing mode keep the PRINT key pressed until [Unit] appears. Press SET key, the selected unit is displayed. Use the MODE key to select between the different units (see following table).
440-49N 440-49A 440-51N 440-53N 440-55N x x x x x x x x x x x x x x x x x x x x x x 440-47N x x x x x x x x x x x x x x x x x x x x x x 440-45N 440-35N x 440-43N 440-33N x 440-35A 440-21A Units Gram Pound Ounce Troy ounce Tael Hongkong Tael Taiwan Grain Pennyweight Momme Tola Carat Freely selectable factor 440-21N Model x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
Selection adjustment weight In the model series KERN FKB_A, the adjustment weight can be selected from three pre-set nominal values (approx.1/3; 2/3; max) (refer also to following table, factory setting with grey background). In order to achieve high-quality weighing results in the sense of the measuring technology, it is recommended to select the nominal value as high as possible. The non delivered adjustment weights can be purchased from KERN as option.
Filter Only models 440-21A, 440-35A, 440-49A This menu item allows the balance to be set according to specific ambient conditions and measuring purposes. In weighing mode keep the PRINT key pressed until [Unit] appears. Press the MODE button several times until „StAbiL“ is displayed. Acknowledge using SET button, the current setting is displayed. Select the desired settings by pressing the MODE button.
Animal weighing function The animal weighing function can be applied for busy weighing. During a defined period the average value of the weighing results is formed. The more unquiet the weighed item, the longer the period should be selected. In weighing mode keep the PRINT key pressed until [Unit] appears. Press the MODE button several times until „ANL“ is displayed. Acknowledge using SET key, the current setting is displayed.
9.4 Interface parameters Data output is carried out via interface RS 232 C. General The previous condition for the data transfer between balance and a peripherical device (e.g. printer, PC ...) is that the appliances are set to the same interface parameters (e.g. baud rate, transfer mode ...). Data transfer mode In weighing mode keep the PRINT key pressed until [Unit] appears. Press the MODE button several times until „Pr“ is displayed. Acknowledge using SET key, the current setting is displayed.
printout Using this function data are selected which are to be sent via the RS232C (not valid for data transfer mode BAPr ). In weighing mode keep the PRINT key pressed until [Unit] appears. Press the MODE key several times until „LAPr“ is displayed. Acknowledge using SET key, the current setting is displayed.
10 Data output RS 232 C 10.1 Technical Data • • • • • 8-bit ASCII Code 1 start bit, 8 data bits, 1 stop bit, no parity bit Baud rate selectable at 1200, 2400, 4800 , 9600 and 19200 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. 2m) 10.2 Pin allocation of balance output bushing: Front view: 5 1 Pin 2: Pin 3: Pin 5: 9 Transmit data Receive data Signal ground 6 10.
10.3.2 AU Pr As soon as the weighing value is stable, the format is automatically transferred from LAPR. c. Format for stable values for weight/quantity/percentage 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 B* B B B B B B B B 0 . 0 B g B B C R d. Format in case of fault 1 2 3 4 5 B B B B B 6 B 7 B 8 E 9 r 10 r 11 o 12 r 13 CR 18 LF 14 LF 10.3.3 AU PC The weighing values are sent automatically and continuously, no matter if the value is stable or unstable. e.
10.3.4 rE Cr The remote control commands s/w/t are sent from the remote control unit to the balance as ASCII code. After the balance having received the s/w/t commands, it will send the following data. Take into account that the following remote control commands must be sent without a subsequent CR LF.
10.4 Output on bar code printer The data transfer mode has to be set on „BA Pr“ (chapter 9.4). As bar code printer the Zebra printer model LP2824 is provided. Take into account that the output format of the balance is fixedly defined and cannot be changed. The printer format is stored in the printer, i.e. in case of a failure the printer cannot be changed with a new one from factory, previously it is necessary that KERN installs the respective software.
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 Possible cause The displayed weight does not glow. • The balance is not switched on. • The mains supply connection has been interrupted (mains cable not plugged in/faulty). • Power supply interrupted. Batteries are inserted incorrectly or empty No batteries inserted.
