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 Manual Precision balance KERN PFB Version 2.
GB KERN PFB Version 2.2 02/2013 Operating Manual Precision balance Table of Contents 1 Technical Data ................................................................................................... 4 2 Declaration of conformity ................................................................................. 8 3 Basic Information (General) ............................................................................. 9 4 Basic Safety Precautions ..................................................
8 Operation ......................................................................................................... 27 9 The menu ......................................................................................................... 37 8.1 8.1.1 8.1.2 8.2 8.2.1 8.2.2 8.3 8.3.1 8.3.2 8.4 8.4.1 8.4.2 8.5 8.5.1 8.5.2 9.1 9.2 9.3 9.4 9.5 9.6 9.6.1 9.6.2 9.6.3 Simple weighing .......................................................................................................................
1 Technical Data KERN PFB 120-3 PFB 200-3 0.001 g 0.001 g 0.001 g 0.01 g 120 g 200 g 300 g 1200 g Reproducibility 0.001 g 0.001 g 0.001g 0.01 g Linearity ±0.003 g ±0.003 g ±0.003 g ±0.
KERN PFB 2000-2 PFB 3000-2 PFB 6000-1 PFB 6K0.05 Readability (d) 0.01 g 0.01 g 0.1 g 0.05 g Weighing range (max) 2000 g 3000 g 6000 g 6000 g Reproducibility 0.01 g 0.01 g 0.1 g 0.05 g Linearity ±0.03 g ±0.03 g ± 0.3 g ± 0.
KERN PFB 600-1M PFB 600-2M Readability (d) 0.1 g 0.01 g Weighing range (max) 600 g 600 g Reproducibility 0.1 g 0.01 g Linearity ± 0.1 g ± 0.
KERN Readability (d) Weighing range (max) Reproducibility Linearity Verification value (e) Verification class Minimum load (Min) Smallest part weight for parts counting PFB 6000-0M PFB 6000-1M 1g 0.1 g 6000 g 6000 g 1g 0.1 g ±1g ± 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.
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.
6.2.1 Placing/ Remove the transportation lock The balance must be installed in a way that the weighing plate is exactly in horizontal position. Remove the transportation lock [ 1 ] (PFB 120-3, PFB 200-3, PFB 300-3): [1] 6.2.2 Scope of delivery Serial accessories: Balance Weighing plate Mains power supply Operating Manual Draft shield (only models PFB 120-3, PFB 200-3, PFB 300-3, PFB 600-1M, PFB 600-2M, PFB 1200-2, PFB 2000-2, PFB 3000-2) 6.
6.5 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.
6.7.1 Procedure when adjusting (non-verifiable models): Observe stable environmental conditions. A warming up time (see chapter 1; Technical Data) is required for stabilization. Ensure that there are no objects on the weighing plate. Balance display Operation In weighing mode press „UnLoAd“ appears. approx. 3 sec. until When display „LoAd“ appears, put the necessary adjustment weight (see chap.1; Technical Data) on the center of the weighing plate.
6.7.2 Adjustment procedure (models PFB-M): Observe stable environmental conditions. A warming up time (see chapter 1; Technical Data) is required for stabilization. Ensure that there are no objects on the weighing plate. Balance display Operation Start balance by pressing During the selftest press . „F1 Unt“ is displayed. Press repeatedly until „tECH“ is displayed Press adjustment switch on the lower side of the balance! Press , „Pin“ is displayed Enter password: Press , , subsequently.
„Pass“ appears, the adjustment process has been finished successfully. Remove adjusting weight during selftest Wait until the balance is again in weighing mode. 6.8 Linearization Linearity shows the greatest deviation of a weight display on the scale to the value of the respective test weight according to plus and minus over the entire weighing range. If linearity deviation is discovered during a testing instrument control, you can improve this by means of linearization.
6.8.
Put on weight 1 (see table chap. 6.8.
6.8.2 Linearization of non verifiable models (low resolution) and verifiable models Balance display Operation Start balance by pressing ON OFF carries out a self test, press appears Press .
6.8.3 Table Linearization points Non-verifiable models: Max 120 g 200 g 300 g 1200 g 2000 g 3000 g 6000 g Weight 1 30 g 50 g 50 g 300 g 500 g 0.
6.9 Verification General introduction: According to EU directive 90/384/EEC or 2009/23EG balances must be officially 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. c) For official purposes d) For manufacturing final packages In cases of doubt, please contact your local trade in standard.
Position of seals and adjusting switch: 1. 2. 3. 4.
6.10 Operation with second display unit PFB-A08 for open points of sale For the use in open points of sale, operation with a second display unit is required. In the models PFB 600-1M and PFB 6000-0M this (PFB-A08) is already existing. The second display unit is exclusively suitable for the connection to KERN balances.
Switch off Sale mode: Setting „SALE n“ = 6000 e or 60000 d The totalizing function is available The weighing units gram and carat are available Start balance by pressing ON OFF .
7 Controls 7.
7.2 Overview of display Display g Description Gram Kilogram kg 0 Zeroing display T Taring ο Stability display Pcs Display for parts counting % Percent weighing display Display for tolerance weighing Momme (mom) Display for adjustment. Signals the adjustment function CAL 0 Weight unit display 26 F Bar graph g (Gramm) (ct) Carat (oz) Ounce (ozt) Fine ounce (d) Dram (dwt) Penny weight (tl.h) Tael (Taiwan) (tl.c) Tael (Chin.) (t.
8 Operation 8.1 Simple weighing 8.1.1 Non-verifiable models Balance display Operation Start balance by pressing ON OFF The balance will carry out a self-test. Wait for „0.0“ display Should the balance not display exactly „0.0“ despite empty scale pan, press the button. The balance starts with resetting to „0“ Place goods to be weighed on balance Wait until the stability display appears [ ]. Read weighing result. To switch off the balance press shortly 8.1.
8.2 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. 8.2.1 Non-verifiable models Balance display Operation Deposit weighing receptacles. The weight of the container is displayed. Press , the zero display appears. The pictogram The pictogram T O is displayed. goes out. The weight of the container is now internally saved. Place goods to be weighed in the weighing container.
8.2.2 Models PFB-M Balance display Operation Put on weighing container. The weight of the container is displayed. (example) Press , the zero display appears. The pictogram NET is displayed. The pictogram O goes out. The weight of the container is now internally saved. Place goods to be weighed in the weighing container. The net weight of the goods to be weighed is displayed. The weight of the weighing container will be displayed as a minus number after removing the weighing container.
8.3 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. The higher the reference quantity the higher the counting exactness. 8.3.
8.3.2 Models PFB-M Balance display Operation ON OFF Start balance by pressing The balance will carry out a self-test. Wait for „0.0“ display. Press . Appears the reference quantity „10“ By pressing the key several times, the reference quantities 10, 20, 50, 100, 200 can be set. Place as many parts to count on the weighing plate as the set reference quantity requires. (example) Confirm by pressing The balance is now in parts counting mode and counts all units on the weighing plate. Press .
8.4 Adding It is useful, when a mixture of various components is weighed in a tare container and finally for control purposes the sum weight of all weighed components is required. 8.4.1 Non-verifiable models Balance display Operation Start balance by pressing ON OFF Whilst the balance is carrying out a selftest, press appears, .
Then appears for 2 seconds the weight of both test items, before the weight of the second test item will appear again. With the further samples proceed as described above. In order to display the total weight of the samples, remove weight from the weighing plate, wait for the zero display and press . The number of weighing actions and the total weight of the samples will be displayed shortly. 8.4.2 Models PFB –M The totalizing function is not available in sale mode.
Press , „ACC 2“ is shortly displayed, then appears shortly the total weight and then the weight of the second sample which now is also stored. With the further samples proceed as described above. In order to display the total weight of the samples, remove weight from the weighing plate, wait for the zero display and press . The number of weighing actions and the total weight of the samples will be displayed shortly. In order to delete the stored values, press the test items is displayed, press „0.
8.5 Percent weighings Percent weighing allows to display weight in percent, in relation to a reference weight. Percent weighing allows to display weight in percent, in relation to a reference weight. 8.5.1 Non-verifiable models Balance display Operation Start balance by pressing ON OFF The balance will carry out a self-test. Wait for the „0.0 g“ display. Put a reference weight on the weighing plate, which corresponds to 100% Press In the display appears „100.
8.5.2 Models PFB-M Balance display Operation Start balance by pressing ON OFF . The balance will carry out a self-test. Wait for the „0.0 g“ display. Put a reference weight on the weighing plate, which corresponds to 100% Press (example) In the display appears „100.00%“ Remove reference weight The display returns to „0.0 %“ Put on specimen In the display appears the percentage of the specimen with reference to the reference weight. Back to weighing mode by pressing again the button.
9 The menu 9.1 Menu map In the menu can be made 8 different settings and the adjustment. 9.2 Call up menu The menu is called-up by pressing the key, while the balance is carrying out the self test. In the display appears the message „F1 UNT“ 9.3 Navigation in the menu Key Direction in the menu Description Select menu and pass through menu items from top to bottom Select current element Exit the current element, return to weighing mode 9.
RS -232 interface S 232: P Prt: connect with printer b XXXX: Baud rate can be selected between 9600, 600, 1200, 2400, 4800 LP-50: not documented EnG: Selection of Language English Chi: Selection of Language Chinese tP: Standard printer setting P Cont: Continuous printout P AUto: autom. Printout P ASk: Data output via remote control commands S USb: not documented Adding (see chap. 8.
9.
P1 Lin P2 CAL Linearization (see chap. 6.
9.6 Menu settings 9.6.1 Switch over weighing units (Unit) (only non-verifiable appliances) The weighing units are switched on or off via the menu. Activate function: Balance display Operation Start balance by pressing ON OFF As long as the balance carries out a self test, press . „F1 Unt“ is displayed. Press (Example) Weighing unit is switched on or off. Use Using to switch weighing unit on or off change to the next unit.
9.6.2 Display background illumination In the menu the display background illumination can be switched on or off. To achieve this, follow the sequence of operations below: Balance display Operation Start balance by pressing or ON OFF As long as the balance carries out a self test, press . (models PFB-M) „F1 Unt“ is displayed. Press „F2 bL“ is displayed. Press (Example) „EL on“ or „EL off“ resp.
9.6.3 Multi-Tare function (only models PFB-M) The balance can be tared several times successively. For that make in the menu the following setting: Balance display Operation Start balance by pressing ON OFF . While the balance carries out a self test, press . „F1 Unt“ is displayed.
10 Data output RS232 You can print out weighing data via the RS 232C interface. 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. Communication parameters (baud rate, bits and parity) of balance and printer must match. 10.
10.3 Printer operation - printout examples Standard printout “weighing data“ G: 8.65 g Gross weight Printout parts counting PCS: UW: G: 10 pcs 0.861 g 8.61 g Reference quantity Individual weight Gross weight Printout adding 1: 2: 3: 1-3: 35.07 g N 8.62 g N 8.00 g N 51.
10.4 Continuous data output -Header 1- , -Header 2- Head line 1: ST=stable, Head line 2: NT=net, -/U -- Weighing data -- k g Weighing unit CR LF Final character US=instable GS=gross 10.5 Remote control instructions The remote control commands 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.
12 Service, maintenance, disposal 12.1 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. 12.
13 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.
