Table of Contents
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Contents
1
1.1
1.2
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.3
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
1.4
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1.4.1
1.4.2
1.4.3
1.5
1.6
1.7
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1.8
1.9
1.9.1
1.9.2
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3.1
3.1.1
3.1.2
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.3
3.3.1
3.4
3.4.1
3.4.2
3.4.3
3.4.4
3.5
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KERN 770/GS/GJ
Version 2.3 04/2000
Operating Instructions
Electronic Precision Balance
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770/GS/GJ-BA-defsi-0023
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Table of Contents
Related Manuals for KERN 770-12
Summary of Contents for KERN 770-12
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Page 1: Table Of Contents
KERN 770/GS/GJ Version 2.3 04/2000 Operating Instructions Electronic Precision Balance Contents OPERATING ELEMENTS MPORTANT NSTRUCTIONS ETTING STARTED 1.2.1 Installation of the weighing chamber 1.2.2 Connecting the Balance to AC Power 1.2.3 Safety Precautions 1.2.4 Connecting Electronic Peripheral Devices 1.2.5 Levelling the Balance Using the Level Indicator... -
Page 2: Operating Elements
3.5.1 Data Output Parameter 3.5.2 Auto Print 3.5.3 Data Output at Defined Intervals 3.5.4 Automatic Taring after Data Output 3.5.5 Data ID Codes 3.5.6 Automatic Output of the Tare Memory Data DDITIONAL UNCTIONS APPLICATION PROGRAMS EMORY “N “ RACTICAL XAMPLE OTAL EIGHING IN ERCENT... - Page 3 KERN 770-12, KERN 770-13, KERN 770-14, KERN 770-15 Designation Designation Weighing pan Verification ID label with metrological data Shield ring for verified balances approved for use as Metrological ID label for verified balances legal measuring instruments approved for use as legal measuring...
- Page 4 Designation Designation Weighing pan Weight display Shield disk AC jack Metrological ID label for verified balances Verification ID label with metrological data approved for use as legal measuring for verified balances approved for use as instruments legal measuring instruments Access switch Manufacturer’s ID label with the CE mark of conformity Levelling foot...
- Page 5 KERN GS / KERN GJ Pos. Designation Pos. Designation Weighing pan Level indicator Shield ring AC jack Levelling foot Menu access switch Level indicator Data interface port PRINT key (data output) Draft shield cover CF key (clear function) Glass draft shield cylinder...
- Page 6 KERN GS / KERN GJ Pos. Designation Pos. Designation Manufacturer’s ID label with the CE CE mark Weighing pan Shield ring of conformity Levelling foot Lug for attaching an anti-theft locking TARE keys device PRINT key (data output) Level indicator...
- Page 7 KERN GS / KERN GJ Pos. Designation Pos. Designation Weighing pan Manufacturer’s ID label with the CE CE mark Levelling foot of conformity TARE key Lug for attaching an anti-theft locking PRINT key (data output) device CF key (clear function)
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Page 8: Important Instructions
Important Instructions Ambient Conditions The KERN 770, GS and GJ balances are designed to provide reliable weighing results under normal ambient conditions in the laboratory and in industry. When choosing a location to set up your balance, observe the following so... -
Page 9: Getting Started
Legal regulations require the verified balance to be sealed. This control seal consists of an adhesive label with the name „KERN“ on it. This seal will be irreparably damaged if you attempt to remove it. In this case, the validity of the seal becomes void and you must have your balance re-verified. - Page 10 For models GS/GJ with a rectangular weighing pan - Place the weighing pan on the balance For models GS/GJ with a round weighing pan Place the shield disk on the balance. Turn the disk counter-clockwise until it stops and is secured. Place the components listed below on the balance in the order given: Pan support...
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Page 11: Connecting The Balance To Ac Power
Important Note ! Use only original AC adapters by KERN. Use of AC adapters from other manufacturers, even if these units have a registered approval rating from a national testing laboratory, requires the consent of a certified technician. -
Page 12: Safety Precautions
1.2.3 Safety Precautions The AC adapter rated to class 2 can be plugged into any wall outlet without requiring additional safety precautions. The pole of the output voltage is connected to the balance housing, which can be grounded for operation. The data interface is also electrically connected to the balance housing (ground). -
Page 13: Operating The Balance
Operating the Balance 1.3.1 Warm-up Time To deliver exact results, the balance must warm up for at least 30 minutes after initial connection to AC power or after a relatively long power outage. Only after this time will the balance have reached the required operating temperature. 1.3.2 Turning the Balance On and Off (Standby Mode) Press the ON/OFF key to turn the display on and off. -
Page 14: Taring
The display shows the following special codes for your information: O displayed in the upper right corner stands for OFF The balance was disconnected from AC power (balance reconnected to AC power or power outage longer than 3 seconds) O displayed in the lower left corner means standby The display has been turned off by the ON/OFF key. -
Page 15: Adjusting (Formerly Calibration)
Adjusting (formerly Calibration) During adjusting, the sensitivity of the balance is adjusted to changes in the ambient conditions. You must adjust your new balance at the place of installation after each warm-up period and before the first measurement. You must also readjust your balance each time you set it up in a different area or when the ambient conditions change (especially the temperature). -
Page 16: External Adjusting
1.4.2 External Adjusting Menu code selection: 1 9 1* The external adjusting weight is a standard fitting for KERN balances without a built-in Adjusting Weight. This adjusting weight allows the checking and new adjustment of your balance at any time. -
Page 17: Data Interface
Data Interface The Data interface port is situated below the protective cap at the back of the balance. Unfasten the protective cap from the data interface port. Important Note ! Make absolutely sure to unplug the balance from AC power before you connect or disconnect a peripheral device (printer or PC) to or from the interface port. -
Page 18: Below Balance Weighing
Below Balance Weighing A port for a below-balance weighing hanger is located on the bottom of the balance To open the below-balance port, remove the cover plate from the bottom of the balance. To hook a sample on the hanger, open the below-balance port by removing the cover plate. -
Page 19: Troubleshooting Guide
Troubleshooting Guide Problem Possible Causes Solution No segments appear on the No AC power available Check the AC power weight display supply Plug in the AC adapter The AC adapter is not plugged in The load exceeds the Unload the balance The weight display shows “H“... -
Page 20: Care And Maintenance
Care and Maintenance 1.9.1 Cleaning Before cleaning the balance, unplug the AC adapter from the wall outlet. Please do not use any aggressive cleaning agents (solvents or similar agents). Instead, use a piece of cloth which has been wet with a mild detergent (soap). Make sure that no liquid enters the balance housing. -
Page 21: Declarations Of Conformity
The warranty will become invalid, if an alteration of the devices mentioned above is not matched with KERN. Date: 25/03/2000 Signature: Gottl. KERN & Sohn GmbH Management Gottl. KERN & Sohn GmbH, Ziegelei 1, D-72322 Balingen-Frommern, Tel. +49-07433/9933-0,Fax +49-07433/9933-149 770/GS/GJ-BA-defsi-0023... - Page 22 Council Directive 90/384/EEC as amended. The weighing instruments were initially verified under number 0111 by the manufacturer at the place of manufacture. Gottl. KERN & Sohn GmbH, Gartenstr. 63, 72458 Albstadt, Tel. 07431/9389-0, Fax 07431/9389-49 770/GS/GJ-BA-defsi-0023...
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Page 23: Balance Operating Menu
3 Balance Operating Menu In the operating menu, you can define how your balance will adapt to ambient conditions and also how it will work to meet your special requirements. For your convenience, the menu codes have been factory-set so that you do not have to make any changes, as a rule. -
Page 24: Accessing The Menu
3.1.1 Accessing the Menu Press ON/OFF to turn off the balance Turn the balance back on. While all segments are displayed, briefly hold down TARE. Release TARE when “1“ is displayed. If “-“ is displayed unlock the Balance Operating Menu: remove the threaded cap located on the right next to the AC jack. -
Page 25: Reset Function - Undoing All Menu Code Changes
The current code setting in the balance operating menu is identified by a small, superscript “o“ after the last number. When you access the operating menu, the previously set code will be displayed after you have selected the right-hand number, which means the entire menu code setting will be displayed. -
Page 26: Balance Operating Parameters
Balance Operating Parameters 3.2.1 Adapting the Balance to Ambient Conditions The balance can be adapted to the prevailing ambient conditions at the place of installation. Code very stable conditions 1 1 1 stable conditions 1 1 2* unstable conditions 1 1 3 very unstable conditions 1 1 4 3.2.2 Standard Weighing Mode - Manual Filling Mode... -
Page 27: Tare Parameter
3.2.4 Tare Parameter You can define when the balance will perform the taring operation: Code at any time 1 5 1 not until the readout is stable 1 5 2* 3.2.5 Auto Zero Function When this function is activated, any slight changes of the zero readout are automatically tared. -
Page 28: Unit Conversion
3 1 18 Baht 0.06578947436 1 7 19 3 1 19 Mesghal 0.217 1 7 20 3 1 20 * = factory setting; depends on balance model in some cases KERN: Verified balances have only the units Gram and Milligram 770/GS/GJ-BA-defsi-0023... -
Page 29: Interface Parameter Settings
Some of the unit symbols printed on hard copy or output on a computer screen will differ from the way they are shown on the balance display: This applies to code numbers ending with 8 = tlh 9 = tls 10 = tlt 14 = /lb 15 = tlc... -
Page 30: Data Interface
Data Interface Balances of the KERN 770, GS and GJ series come standard with an interface. You can plug a printer or a personal computer into this interface port. In addition, you can choose to have data output from your balance to this on-line device either automatically or by pressing a key. - Page 31 3.5.3 Data Output at Defined Intervals The volume of data in the „auto print“ mode can be reduced by defining the intervals at which data will be output automatically. This auto print interval is based on the number of display updates. Auto print interval Code 1 display update...
- Page 32 3.5.5 Data ID Codes To help you identify weights, piece counts, percentages, etc., a code letter is displayed in front of these values. For example, an “N“ displayed in front of a weight value identifies it as a net weight. Without data ID only net weights, results in percent and counting results will be output.
- Page 33 4 Application Programs In addition to the functions implemented for weighing, the KERN 770, GS and GJ balances offer you a variety of application programs. To select an application program or a specific function, set the appropriate code in the menu.
- Page 34 Practical Example “Net Total“ Menu code settings used in this example: Function Code Tare memory 2 1 6 Automatic data output 7 1 2 With data ID code 7 2 2 Printout of individual components/tare weights 7 3 1* It is useful if you weigh a mixture of several components in a tare container and if you need the total weight of all components for control in the end (Net-Total, i.e.
- Page 35 Weighing in Percent Weighing in Percent Code 2 1 5 Symbol displayed: This application program enables you to obtain weight readouts in percent which are in proportion to a reference weight. The reference weight is stored as a menu-defined percentage (factory setting: 100 %). Changing the Reference Percentage The reference percentage can be changed by you, in cycles.
- Page 36 Practical Example “Determination of the Residual Weight in Percent“ Menu code settings used in this example: Function Code Weighing in percent 2 1 5 Quick determination of the Balance Readout dry weight of a sample Place container on weighing pan. 22.65 g CF, TARE 0.00 g...
- Page 37 Counting Counting Code 2 1 4 Symbol displayed: The counting program allows automatic conversion of weights into piece counts based on a reference sample weight. A weight readout is stored as a reference quantity (factory setting: 10 pcs = pieces). Displaying the Reference Sample Quantity If the weighing pan is unloaded, the set reference sample quantity (pcs) briefly appears in the weight display after having pressed the F key.
- Page 38 Practical Example “Counting Small Parts“ Menu code settings used in this example: Function Code Counting 2 1 4 Counting bulk quantities Balance Readout of items with the same weight Place container on weighing pan. 22.65 g 0.00 g CF, TARE Add 10 counted parts.
- Page 39 Animal Weighing/Averaging Animal Weighing/Averaging Code 2 1 7 Symbol displayed: Use this program to determine the weights of living animals or weights under unstable ambient conditions. In this program, the weight is calculated, by the balance, as the average of a selectable number of individual weighing operations.
- Page 40 In this case, the start criterion is defined by the difference between two successive sub- weights measured. If the animal moves, the start criterion is not met; therefore, averaging will not start. Once the animal has calmed down, the program checks whether two measured sub-weights are within the previously selected range.
- Page 41 Practical Example “Animal Weighing in the Automatic Start Mode“ Menu code settings used in this example: Function Code Animal weighing 2 1 7 Average Start delay 3 7 2* Automatic start mode 3 8 2* Automatic Weighing of animals based Balance Readout on 20 sub-weighing operations Place animal weighing bowl on balance.
- Page 42 Practical Example “Animal Weighing in the Manual Start Mode“ Menu code settings used in this example: Function Code Animal Weighing 2 1 7 Average Start delay 3 7 2* Manual Start mode 3 8 1 The number of sub-weighing operations is changeable. If you do not enter a number, averaging will be done based on the number shown on the display (factory setting: 10 sub-weighing operations).
- Page 43 Operating the balance with a Device that has an ISO/GLP Printing or Recording Capability. To the KERN 770, GS and GJ balances a special Data printer can be connected for generating ISO/GLP-compliant printouts. This printer provides you with the following functions: Turns the ISO/GLP function on and off;...
- Page 44 4.1 Printout/Record for Adjusting and Linearisation Functions A printout or record is generated at the end of the following functions: all adjusting and linearisation procedures; sensitivity test. The printout can consist of the following lines: ----------------- 770 : Balance model Model 040500046 : Serial number of the balance : Space for entering a workstation or operator ID...
- Page 45 Data Printout/Record (ISO/GLP-compliant) To have a data record printed out, perform the following: Press PRINT to output the printout heading and the first value (after you have turned on the balance or cleared a function by pressing CF) Press PRINT to output additional data To end printout generation and recording of data, press CF.
- Page 46 Data Printout/Record for Application Programs (e.g. Counting) For application programs, reference data (parameters) can be included in the printout/record. Automatic output of the reference data (parameters) Code 7 1 1* Reference quantity and reference weight 7 1 2 To have a data record printed out, perform the following: Press F to output the printout heading and reference data (the reference data will be stored at the same time) Press PRINT to output the printout heading and the first value.
- Page 47 General Information This description has been written for users who wish to connect their KERN 770, GS and GJ balance which has a built-in RS 232 C interface port as a standard feature, to a computer or a different peripheral device.
- Page 48 General Specifications Type of interface Serial point-to-point connector Operating mode of interface Asynchronous, full-duplex Standard V28, RS 232 C specification Handshake*) 2-wire interface: via software (XON/XOFF) 4-wire interface: via hardware handshake lines with Clear To Send (CTS) and Data Terminal Ready (DTR) Transmission rates*) 150, 300, 600, 1.200, 2.400, 4.800, 9.600, 19.200...
- Page 49 Data Output Formats Depending on the menu code setting: Code 7 2 1 = without data ID code or : Code 7 2 2 = with data ID code data will be output with either 16 (Code 7 2 1) or 22 characters (Code 7 2 2). For data output of 22 characters, a 6-character ID precedes the 16 characters reserved for the weight or other value.
- Page 50 When data are output without decimals, the decimal point is suppressed (except when a certain display mode is selected). ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- Data output example: + 12.5557 g Characters: Plus or minus sign or space Space 3rd - 10th...
- Page 51 Special Codes Special codes are output only if the balance operating menu code 6 1 1, 6 1 4 or 6 1 5 is set (see the section entitled “Data Output Parameters“). Special status-dependent codes The following status codes are output for “A B“: * * : Tare H * : Overload C * : Adjust*)
- Page 52 Data Output with ID Code When data with an ID code is output, the ID code consisting of 6 characters precedes the data with the 16-character format. During data output, all characters are shifted to the right by 6 places. 1st character 22nd CR LF...
- Page 53 Data Input Formats Commands can be input via the balance interface port to control the balance functions. Control commands are distinguished according to those with upper-case letters, or special characters, and those with lower-case letters. Format for Control Commands Control commands can include up to 13 characters. Each character must be transmitted with a start bit, a 7-bit ASCII-coded character, a parity bit, and one or two stop bits.
- Page 54 Control Commands with upper-case Letters or Special Characters PRINT (print, activate/block auto print) Restart/self-test Tare Internal adjusting* The P, T, and Z commands do not affect the menu code settings of the balance. The S command causes the processor to reinitialise (turns the balance off and back on again). The balances will operate according to the commands available up until the processor is reinitialised.
- Page 55 Control Commands with lower-case Letters All functions that can be selected by pressing the respective keys on the balance can also be activated by commands. Function key F Function key CAL Clear Function CF Perform sensitivity test* Output balance model Output serial number Each control command with the lower-case letters f, s and x must be terminated by an underline (ASCII = 95).
- Page 56 Synchronisation and Data Output Parameters Definition During data communication between the balance and an on-line device (computer), “telegram-style“ information consisting of ASCII characters is transmitted by the interface. For error-free data communication, the interface parameters, including the baud rate, parity and handshake mode as well as the character format, must be the same for both units.
- Page 57 For data communication with a software handshake, “XON“ must be sent by a device when it is turned on in order to enable another on-line device to exchange data. Sequence: Balance Receiving device -------- byte ---------> -------- byte ---------> -------- byte ---------> <---------<XOFF>--------- -------- byte --------->...
- Page 58 If you select the auto print setting, data will be transmitted immediately the moment you turn on the balance. Higher Data Output Rates If you require an output rate higher than 10Hz, ask KERN directly for this information. 770/GS/GJ-BA-defsi-0023...
- Page 59 Interface Parameter Settings Baud Rate Code Changes Utilities 150 Baud 5 1 1 Data Output Parameter Changes 300 Baud 5 1 2 Print on request 600 Baud 5 1 3 without stability 6 1 1 1,200 Baud 5 1 4 Print on request 2,400 Baud 5 1 5...
- Page 60 Warning when using pre-wired RS 232 C Connecting Cables ! RS 232 C cables purchased from other manufacturers often have incorrect pin assignments for use with KERN balances. Therefore, before connecting the cable, make sure to check the pin assignment according to the chart below and disconnect any lines that are assigned as „Internally Connected“...
- Page 61 Cabling Diagram Diagram for interfacing a computer or a peripheral device to the balance using the RS 232 C/V24 standard and interface cables up to 15 m (50ft.) long. 770/GS/GJ-BA-defsi-0023...
- Page 62 7 Specifications Model 770-13 770-15 770-12 770-14 770-60 Technical Data - Unit (g) Readout (d) 0,1 mg 0,1 mg 0,1 mg 0,1 mg 0,01/0,1 mg Verification interval (e) 1 mg 1 mg 1 mg Weighing range (max) 120 g 220 g...
- Page 63 Model GS 410-3 GS 620-6 GS 4100-2 GS 6200-1 Technical Data - Unit (g) Readout (d) 0,001 g 0,01 g 0,01 g 0,1 g Verification interval (e) Weighing range (Max) 410 g 620 g 4100 g 6200 g Minimum capacity (Min) Reproducibility 0,001 g 0,01 g...
- Page 64 Model GJ 410-3M GJ 610-2M GJ 4100-2M GJ 6100-1M Technical Data - Unit (g) Readout (d) 0,001 g 0,01 g 0,01 g 0,1 g Verification interval (e) 0,01 g 0,1 g 0,1 g Weighing range (max) 410 g 610 g 4100 g 6100 g Minimum capacity (min)
- Page 65 8 Supplement - Overview of All Menu Settings This summary of the menu settings shall help giving you a quick overview. The most vital menu code settings for the balance operating menu Ambient Conditions Code Tare parameter Code Weighing Units very stable 1 1 1* anytime 1 5 1...
- Page 66 Additional ISO/GLP-compliant Utilities functions Printout or Record Data output Code Menu access Code The adjusting operations and without stability 6 1 1 accessible 8 1 1 measured values are automati- after stability 6 1 2* menu-setting-dep. 8 1 2* cally output, over the data inter- at stability 6 1 3 face, in a document that records...