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 4.1 09/2009 Operating instruction Precision balances Table of Contents 1 Technical data ................................................................................................ 4 2 Declaration of conformity ............................................................................. 8 3 Basic Information (General).......................................................................... 9 3.1 3.2 3.3 3.4 Proper use........................................................
8 Settings......................................................................................................... 22 8.1 8.2 8.3 8.4 8.5 8.5.1 8.5.2 8.6 8.7 Call-up menu structure .......................................................................................................... 22 Leave menu structure ............................................................................................................ 23 Dosing and Zero-tracking............................................................
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 1,000 g Taring range (subtractive) 400 g 600 g 400 g 1,000 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) 2,000 g 4,000 g 6,000 g Taring range (subtractive) 2,000 g 4,000 g 6,000 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 7.
KERN 440-51N 440-53N 440-55N 1g 1g 0.2 g Weighing range (max) 4,000 g 6,000 g 6,000 g Taring range (subtractive) 4,000 g 6,000 g 6,000 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 Weighing Units Recommended adjustment weight, not added (class) 5, 10, 25, 50 Details „Weighing units“ chapter 7.
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 weighings.
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.
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 Scope of delivery Serial accessories: • Balance (incl. protective cover) • Weighing plate • Mains power supply • Operating Manual • Windshield (440-21N, 440-21A) 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. 6.4 Operation using a (rechargeable) battery (optional) Lift-off the battery cover on the lower side of the balance.
6.5 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. 6.6 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).
6.9 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. • Turn round the balance. • Open the closing lid (1) on the bottom of your balance. • Screw-in the hook for underfloor weighing (2) carefully and completely till to the stop (do not screw-in farther, as this will damage the balance). • Place your balance over an opening.
7 Operation 7.1 Overview of display 7.2 Weighing Switch on the balance using the key. The balance shows for approx. 3 seconds „88888“ in the display and then goes to „0“. Now it is ready for operation. Important: Should the display flash or not be on „0“, press the key. Only now (!) place goods onto weighing plate. Take care that the weighed material does not touch the balance housing or the base mat. Now the weight is displayed, after the standstill control appears the weighing unit (e.g.
7.3 Taring Switch-on the balance using the key and wait for the „0“ display. Put the tare vessel on the weighing plate and press the key. The balance display goes to „0“. The weight of the container is now internally saved. If one after finishing the weighing process presses again the key, „0“ appears anew in the display. 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.
7.6 Parts counting Switch-on the balance using the Press key and wait for the „0“ display. key shortly. Appears the reference quantity 5. By pressing the key several times other reference quantities 10, 25 and 50 can be called up. Place as many parts to count on the weighing plate as the set reference quantity requires. Confirm with key. The balance is now in parts counting mode counting all parts on the weighing plate.
7.7 Net-total weighings It is useful if a mixture of several components is weighed into a tare vessel and finally the sum weight of all weighed components is necessary for control purposes (nettotal, i.e. the weight of the tare vessel). Example: Put tare vessel onto weighing plate, tare with key to „0“. Weigh component n and tare with key (Memory) to „0“. The memory activation is indicated by a triangle on the left border of the display.
7.9 Weighing units (Unit) Switch-on the balance using the key and wait for the „0“ display. key and keep it pressed until „UNIT“ appears on the display. Press the shortly, the selected unit appears in the display. Press Use the key to select between the different units (see table). By pressing the key the selected weighing unit is taken over.
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 x 440-43N 440-35N x 440-35A 440-33N Units Gram Pound Ounce Troy ounce Tael Hongkong Tael Taiwan Grain Pennyweight Momme Tola Carat Freely selectable factor 440-21A Model 440-21N The different weighing models have integrated different foreign weighing units.
7.11 Animal weighing function The balance has an integrated animal weighing function (mean value calculation). With this function it is possible to weigh domestic or small animals exactly, although they do not stand quiet on the weighing plate. Note: If they move too much, an exact weighing will not be possible. In the menu the animal weighing function can be switched on or off. To achieve this, follow the sequence of operations below: Switch-on the balance using the key and wait for the „0“ display.
8 Settings 8.1 Call-up menu structure Switch-on the balance using the key and wait for the „0“ display. key pressed approx. 3 sec. until To enter into the menu structure keep the „UNIT“ appears. By pressing the key the different menu items are called up. Use the select a menu item. Within this menu item use the pressing repeatedly the Press the PRINT key 3 seconds -> Chapter 8.5.1 Data transfer mode key to make your choice. By key the setting is saved.
8.2 Leave menu structure Everywhere in the menu it is possible to leave the menu structure and thereby save or reject the changes made. After pressing the key „Exit“ is displayed. A: Use the (YES) key, to confirm. After that „store“ is displayed. If it shall be key repeatedly. saved, press the If the menu shall be left without saving, press the NO key. B: The (NOT EXIT) key must be pressed, if the next menu item shall be reached. After having set all the individual adjustments, it can be saved. 8.
8.4 Selection of the adjustment weight In the model KERN 440, the adjustment weight can be selected from four pre-set nominal values (approx.1/4; 1/2; 3/4; max) (refer also to table 1 below, 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.
8.5 Interface RS232C Data output via interface RS 232 C General Information The previous condition for the data transfer between balance and a peripheral device (e.g. printer, PC ...) is that the appliances are set to the same interface parameters (e.g. baud rate, transfer mode ...). 8.5.1 Data transfer mode Setting of data transfer mode 1. Keep the 2. Press Balance display Unit key pressed until „Unit" is displayed. Pr key, „Pr“ appears. 3. To change the setting, press the Pr PC key. 4.
8.6 Selection printed edition Use this function to select which data are sent via the RS232C interface. To achieve this, follow the sequence of operations below: (is not valid for the data transfer mode BAPr ) Switch-on the balance using the key and wait for the „0“ display. Press the key and keep it pressed until „UNIT“ appears on the display. Press the key twice, in the display appears „LAPr“.
8.7 Reset to factory setting With this function the manual changes of the menu settings are reset to factory setting. For this switch on the balance using the key and wait for the „0“ display. Press the key and keep it pressed until „UNIT“ appears on the display. Press the key nine times, in the display appears „rst“. Acknowledge selection with Use the key. The current status „no“ is displayed. key to set the status to „YES“.
9 Data output RS 232 C 9.1 9.2 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 and 9600 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) Pin allocation of the balance output socket (front view), 5 1 Pin 2: Pin 3: Pin 5: 9 9.
9.3.3 AU PC The weighing values are sent automatically and continuously, no matter if the value is stable or unstable. e. Format for stable values for weight/quantity/percentage 1 2 3 4 5 6 7 8 9 10 11 12 13 B* B B B B B B B B 0 . 0 B 14 g f. Format in case of fault 1 2 3 4 5 B B B B B 12 r 6 B 7 B 8 E 9 r 10 r 11 o g. Format for unstable values for weight/quantity/percentage 1 2 3 4 5 6 7 8 9 10 11 12 B* B B B B B B B B 0 . 0 13 B 15 B 13 CR 16 B 17 C R 18 LF 14 LF 14 15 CR LF 9.3.
SYMBOLS: B* B / 0 /. g E, o, r CR LF 9.4 = blank or M = blank / weight values / decimal dot, depending on the measuring Value = weight unit / unit / % = ASCII code or “E, o, r” = carriage return symbol = line feed symbol Output on bar code printer The data transfer mode has to be set on „BA Pr“ (chapter 8.5.1). As bar code printer a Zebra printer model LP2824 is provided. Take into account that the output format of the balance is fixedly defined and cannot be changed.
10 Service, maintenance, disposal 10.1 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. 10.
11 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.
