PA Series Precision Analytical Balances USER MANUAL
Contents
1. Advance and Back keys to advance or move back the digit and Enter key to accept the value P N 8191 Revision A1 September 2006 Page 10 of 32 8 0 INPUT OUTPUT oao O RS 232 15Vde 800ma 1 O Ext L CEZ ag i The rear panel has connectors for RS 232 serial and buffered l C bus interfaces and a power input socket Required power input is a low voltage external supply 15VDC 800mA Various communication options e g USB LAN Wireless will be implemented in the future via add on black boxes which will convert the RS 232 serial output or IC to the desired protocol The basic unit includes RS 232 serial communications only P N 8191 Revision A1 September 2006 Page 11 of 32 9 0 OPERATIONS 9 1 INITIALISATION gt 0e Dalem ena n en a a oae CAL custom When the balance is first switched on it BPTG Time ae et Pes MS i Net MMITHS will display the balance serial number if J R i Kig set software revision model capacity SS m m e KemI and then all segments on the display will be shown Overall the time taken is usually 5 10 seconds If a passcode has been set the display will show PASSCODE and the main display will show a zero In this case you must enter the passcode to continue using the numeric entry method see section 7 1 A different passcode may be set for a Supervisor to weigh or to have access to the selected User menus I2. P N 8191 Revision A1 September 2006 Page 17 of 32 HARDWARE The RS 232 interface is a simple 3 wire connection The input and output connections are Connector 9 pin D sub miniature socket Pin 2 input to balance RXD Pin 3 output from balance TXD Pin 5 Signal ground GND Handshaking is not applied Baud rate 4800 9600 19200 38400 Parity NONE 8N1 EVEN 7E1 or ODD 7 O 1 All lines are terminated with carriage return and line feed lt CR gt lt LF gt In continuous output mode or if single line output on demand is selected the serial output format will be a single line in the form 1234 567 g lt CR gt lt LF gt The format of the single line output will change depending on the mode in which the balance is operating as described below If output on demand is selected the user may optionally configure the serial output as a choice of 3 styles of form either in a default format or in one of two custom formats Each of the custom formats can be configured to output up to 15 lines of data The data types that can be printed are NAME TEXT PRINTED ID number ID no XXXXXXXXXXXX Serial number Serial NO XXXXXXXXXXXX Date DATE dd mm yyyy Time TIME hh mm ss Net weight Net xxx xxX g Gross weight Gross XXX XXX g Tare weight Tare xxX xxX g Unit weight Unit wt xxx xxx g Count Count xxxx pcs Reference weight Ref wt XXX XXX g Percent Percent
3. Mechanical Problems The balances consist of complicated and fragile mechanical devices They can be damaged by placing a weight on it which is too high for the balance or by dropping the balance or occasionally shipping it without taking care The most fragile parts are the flexures Dust dirt spills and other foreign objects in the balance can also cause problems P N 8191 Revision A1 September 2006 Page 28 of 32 Electronic Problems These are the rarest of the problems affecting balances If an electronic problem is suspected make sure the mechanical problems that can cause similar symptoms have been eliminated before attempting electronic repairs With the exception of cables most electronic repairs are solved by board replacement The table that follows is a guide of common problems and their solutions Note that many problems may have multiple solutions and there may be problems found that are not listed in the table For Service Information contact your supplier BALANCE DOES NOT FUNCTION The balance is dead when power is applied Power supply failure Check adapter is working Check adapter is correct for the balance Normal adapter is 15VDC 800mA Power supply circuit board failure Short circuit on any circuit board The display does not turn on but the calibration motor moves when power is applied Power is getting to balance display is not working Check display cables Replace
4. weighing PERCENT will be displayed e Press Enter to enter the function e Display will show PERCENT SAMPLE e Press Enter to select the sample method e When LOAD 100 is shown add the sample e Press Enter to set this weight to be 100 When ready the display will show 100 e Remove the sample and place an unknown sample to display the percentage weight e To set another weight as 100 press Mode and continue as before e To manually enter a value to be set as 100 press Up or Down key when PERCENT SAMPLE is shown to select PERCENT Ent Wt e Press Enter to select the manually entered weight method e Enter the weight using the numeric entry method see section 7 1 e Place unknown sample to display the percentage weight e To perform percent weighing with another sample press Mode and continue as before e Toreturn to normal weighing press Esc Note Percentage will be displayed to the maximum number of decimal places based on the resolution of the balance To increase or decrease by one decimal place press the Up or Down key respectively P N 8191 Revision A1 September 2006 Page 15 of 32 10 0 CALIBRATION The balance can be calibrated using either an internal mass default method or an external mass if setup by the user to do this See the User Parameters section 10 1 MANUAL CALIBRATION Pressing the Cal key will start calibration Calibrati
5. xx xxx A blank line printed lt CR gt lt LF gt only Any of these can be printed on any of the 15 lines available Not all items need to be used and any one can be used more than once see section 13 3 P N 8191 Revision A1 September 2006 Page 18 of 32 The data for each form will be preceded by a start of header lt SOH gt character 01 and terminated with an end of transmission lt EOT gt character 04 These characters will be ignored by a serial printer but will allow a computer program which reads the data to distinguish between this block report format and the single line output format described above STANDARD FORMAT The balance will print the following data as the standard form The standard form cannot be changed The format of the custom forms 1 and 2 will be the same as the standard form until modified by the user Line 1 Date Line 2 Time Line 3 Blank line Line 4 ID number Line 5 Blank line Line 6 Result Line 7 Blank line Line 8 Blank line This will result in a printout that looks like Date 23 09 04 Time 15 45 ID No 123456 Net 123 456 g NOTE The format of the results line will change depending on the mode in which the balance is operating e g Normal weighing 123 456 g Parts counting 1234 pcs Percent weighing 12 345 P N 8191 Revision A1 September 2006 Page 19 of 32 INPUT COMMANDS U
6. display module The display stays on the initial test screen when power is applied Calibration weight motor is on Unstable balance Balance not working correct Power supply Check if balance is stable by using service menu and view A D values Put breeze shield over pan Check power supplies BALANCE WORKS BUT IS NOT STABLE Balance is unstable by a few divisions Noise or vibration from environment Friction in mechanics Check the balance is positioned correctly to avoid vibration wind or air movement it is on a solid table It is not near sources of heat or cool air Check balance with weights if problem occurs when sample is used Static electricity on the samples can cause drifting and instability Check the area around the weighing pan for hair dust obstructions under the pan A complete inspection of the mechanics to look for sources of friction P N 8191 Revision A1 September 2006 Page 29 of 32 Balance is very unstable and does not weigh correctly Mechanical problems Balance programming Electronic problems A complete inspection of the mechanics to look for sources of friction Verify the A D is also unstable If the A D is OK then suspect the programming of the balance Reset parameters check temperature compensation and redo the calibration Some electronic problems can also cause this But all mechanical problems must be reso
7. or OFF PERIODIC Set the RS 232 to send data periodically set in seconds to On or OFF If On is selected the value can be changed between 1 and 999 seconds using Up and Down FORMAT To send data as a single line of data using the standard format or using a customer designed format FORM 1 or FORM 2 P N 8191 Revision A1 September 2006 Page 23 of 32 Format of custom forms 1 and 2 If FORM1 or FORM2 is selected it can be changed by the user using a selection of available data By default the 2 forms are the same as the standard form unless changed by the user as below When FORM 1 or FORM 2 is selected the user can set the information to be printed on each line of the form Pressing the Up or Down keys will cycle through the options available The options are INST ID Instrument ID number SER No Serial Number TIME Time DATE Date NET Net Weight Gross weight Tare Weight GROSS Gross Weight TARE Tare Weight UNIT Unit weight in parts counting mode COUNT Number of items in parts counting mode REF 100 weight in percent weighing mode PERCENT Percentage of reference weight in percent weighing Cr Lf Inserts a blank line END Signifies the end of the report When END is entered the display returns to the RS 232 Sub menu Enter the data to be printed on the first line by pressing the Up or Down key to cycle through the options If
8. temperature variation from 0 2 to 4 C OFF Disabled Press Mode to advance to setting of the next menu which PASSCODES or Esc to return to normal weighing P N 8191 Revision A1 September 2006 S Page 26 of 32 13 6 PASSCODES To enable the security features in this balance it is necessary to set passcodes There are 2 passcodes called Operator Passcode and Supervisor Passcode The Operator Passcode allows an authorised user to operate the basic weighing functions of the balance but will not allow access to the Supervisor Menus if the Supervisor Passcode has been set To change or disable a Passcode it will be necessary to enter the current passcode Press Enter when PASSCODES is displayed to enter this section OPERATOR Enter the current passcode OLD first then enter a new passcode if desired A passcode set to zero will disable the security feature and allow unlimited access SUPERVISOR Enter the current passcode OLD first then enter a new passcode if desired A passcode set to zero will disable the security feature and allow unlimited access 13 6 1 Forgotten Passcodes Keep a record of the passcode to ensure you can access this section again If however you have forgotten your passcode you can still gain access by entering a universal code If you have forgotten the current passcode a code of 15 will always allow you to enter the Supervisor area Using
9. 0 SUPERVISOR MENUS cota ia os ate a a cou aus os EA eea R AE Aa Ae ont aea 21 13 1 ENABLE WEIGHING UNITS sacorodonaa ion 21 13 2 ENABLE WEIGHING MODES coooccccccccccccccconnnnnnnnncnnnncncnnnnnnnnnnnnnnnnncnnnnnnnnnnnccnnnncn 22 13 3 ENABLE SERIAL INTERFACE PARAMETERS cccccccccccnnnonnncnnnnnncnanannnnnnncnnnnncnos 22 13 4 SETUP PARAMETER Svtolccnci icon it ia 24 135 CGALIBRATION SE TUE screen bed tcc cans es inee AAAA A AEE aeaii 25 HES Seal O cake ory eee eter carter mon ere ter nee re Ne E 26 13 6 1 Forgotten Passcodes mcccccoriirartinccisi radio danita 26 14 0 SAFETY AND MAINTENANCE suscitan idad 27 15 0 TROUBLE SHODOTINEA cnica ci iii 27 P N 8191 Revision A1 September 2006 Page 4 of 32 1 0 INTRODUCTION Thank you for selecting the Analytical Balance This Instruction Manual will familiarise you with the installation trouble shooting general maintenance of the balance etc and will guide you through the various applications Please read this Manual thoroughly before starting the operation If you need any clarifications feel free to contact your supplier PRODUCT OVERVIEW This Analytical Balance is ideal for laboratory and general purpose weighing FEATURES e Large easy to read LCD display with backlight e Applications include weighing parts counting and percentage weighing e Internal Calibration using motorised internal calibration weight or external calibration if set by the user e Bi directiona
10. ER Set a value for the amount of filtering to be done seta value of 5 10 20 30 40 or 50 A larger number is more filtering and a slower response Default is 20 STABILITY Set a value to be used to determine balance stability set a value of 1 2 5 or 10d A larger number corresponds to a larger stable zone Default is 5 AUTO ZERO Can be set to On or OFF to enable the auto zero function If set to On select from 1 2 or 5d P N 8191 Revision A1 September 2006 Page 25 of 32 The sub menu is entered by pressing Enter e Use the Up and Down keys to increase or decrease the value for setting Press Enter to accept the setting and advance to the next item in the menu e Press Mode to advance to setting of the next menu or Esc to return to normal weighing 13 5 CALIBRATION SETUP This menu allows the user to set the calibration parameters e Press Enter when CAL SETUP is displayed to select the calibration parameters e The options for each parameter can be scrolled through by using the Up or Down key ENABLE NO operator calibration is disabled YES operator calibration is enabled CAL REPORT On Enabled Prints out Calibration report after successful calibration OFF Disabled TIME CAL On Enabled Select time from 1 to 24 hours Default setting is 4 hours OFF Disabled TEMP CAL On Enabled If set to On set the
11. SEMBLING THE BALANCE e Locate balance on solid surface free from vibration e Open the sliding door and gently place the square base plate the locating disc weighing platform the guard ring and then the stainless steel top e Level balance using the adjustable feet and spirit level Connect the power to the balance e For best performance let the balance warm up for 30 60 min and calibrate before using 5 3 WARM UP TIME ofo RS 232 18Vae S00ma VO Ext es CEZ LEVELLING THE BALANCE After placing the balance in a suitable place level it by using the spirit level on the rear of the balance To level the balance turn the two adjustable feet at the rear of the balance until the bubble in the spirit level is centred Attach the power supply cable to the connector on the rear of the balance Plug the power supply module into the mains The display will indicate the balance serial number if set and the software revision number followed by the capacity of the balance Next the balance will run a self test by displaying all segments and then will show zeros accompanied by the zero symbol If the balance serial number is not set the display will show dashes Before you start weighing you have to wait for the balance to achieve a stable internal temperature Typical initial warm up time suggested for a balance already at room temperature is about 1 hour 30 J gt HHHHEP A stable sign is shown when t
12. SING REMOTE KEYS The balance can be controlled with the following commands sent using remote keys such as from a PC The commands must be sent in upper case letters i e KT not kt Press the Enter key of the PC after each command the action of Carriage Return is denoted as lt CR gt as shown below Basic Input Commands IKT lt CR gt Tares the balance to display the net weight This is the same as pressing the Zero Tare key when the balance is in the normal weighing mode IKS lt CR gt Enters the Setup section This is the same as pressing the Setup key when the balance is in the normal weighing mode Once entered the Setup section the balance can be controlled remotely using the Input Commands as mentioned in this table which will perform the same key functions as described in section 13 0 IKP lt CR gt Transmits data over RS 232 interface This is the same as pressing the Print key when the balance is in the normal weighing mode IKM lt CR gt Enters the Modes section This is the same as pressing the Mode key when the balance is in the normal weighing mode IKC lt CR gt Enters the Calibration section This is the same as pressing the Cal key when the balance is in the normal weighing mode IKU lt CR gt Enters the Unit selection section This is the same as pressing the Units key when the balance is in the normal weighing mode Invalid Input Command If an inv
13. Symmetry PA Series Precision Analytical Balances USER MANUAL Software Revision 2 35 P N 8191 Revision A1 September 2006 Page 2 of 32 P N 8191 Revision A1 September 2006 Page 3 of 32 CONTENTS LA INTROBUCTON aaa 4 200 TECGHNIGAL SPECIFICATION Scotia 5 3 0 UNPACKING THE BALANCE oocccccccnonnononnncnnnnncnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnncnnnnnrrnnnnnnnnnncrnnnnin 6 4 0 LOCATING THE BALANGE ico i cececethci deh He cececintdcnbetid tds 6 5 0 SETTING UP THE BALANCE corvina tido 7 Bil ASSEMBLING TAE BALA NOE a a ea a a ee lolita 7 52 LCEVEL NG THE BALANO E e ae 7 5 3 WARM UP TIME tool brocas 7 60 E i E nd E i 2 T 8 TIRE PRD tdi atest a a lee hones 9 7 1 NUMERIC ENTRY METHOD sian a aaa a cio de 9 80 INPUVOUTPU a co eres cars Socaared ots ines Voc eWac eats Cadetees A A 10 30 OPERATION Sanare 11 ga INITIALISATION bocata ia 11 92 PASSCODES ta tii 11 93 NEVINS a A AEE 12 9 3 1 Weighing Umts ect i 12 OA FUNCTION SS A a E O 13 9 4 1 Parte GoOUntinds ui e e il ba 13 9 4 2 Percent WeldhINd ota a o 14 10 0 CALIBRATI N cai taa 15 10 1 MANUAL CALIBRATION o AS A A A AA 15 10 1 1 Calibration using Internal Calibration MASS ooonncccccccccnnccccncnccoaocccnnnnnnnnnannnns 15 10 1 2 Calibration using External Calibration MaSS ooooococcccccnnncccnncncnanoccconnninonanannns 15 10 2 AUTOMA TIC CALIBRA TION costar ii ii id 15 TO S232 INTERFACE coli bid 16 120 ERROR GHEGCKING 0 tia 20 13
14. alid command is received then the command is returned as follows Invalid Command Message returned Remarks INT lt CR gt IEU lt CR gt Command character is not K IKK lt CR gt IEK lt CR gt Key character is not T S P M C or U IKT lt CR gt IEF lt CR gt Command format error lt CR gt is not the fourth character KT lt CR gt or No reply Either Y or lt CR gt is missing in the IKT command string P N 8191 Revision A1 September 2006 Page 20 of 32 12 0 ERROR CHECKING During weighing the balance is constantly checking to see if the balance is operating within the limited parameters The errors likely to occur are A D counts below lowest allowed value A D counts above highest allowed value A D not operating Maximum capacity exceeded Other errors may be detected during special functions or operations These will be described in the section that applies Error messages and the reasons are Concerning A D counts ERROR ADc UL A D counts below a limit ERROR ADc OL A D counts above a preset limit Concerning calibration Calibration could not be completed ERROR St because the results were not stable Calibration constant not within 20 of old ERROR LO or ERROR HI calibration constant Concerning weighing ERROR LO Weight display is below zero by gt 4 max ERROR HI Weight is a
15. ant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment The equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Shielded interconnect cables must be employed with this equipment to insure compliance with the pertinent RF emission limits governing this device Changes or modifications not expressly approved by the manufacturer could void the user s authority to operate the equipment P N 8191 Revision A1 September 2006 Page 32 of 32 Copyright by the manufacturer All rights reserved No part of this publication may be reprinted or translated in any form or by any means without the prior permission of the manufacturer The manufacturer reserves the right to make changes to the technology features specifications and design of the equipment without notice All information contained within this publication is to the best of our knowledge timely complete and accurate when issued However we are not responsible for misinterpretations which may result from the reading of this m
16. aterial P N 8191 Revision A1 September 2006
17. bove maximum plus 90d P N 8191 Revision A1 September 2006 Page 21 of 32 13 0 SUPERVISOR MENUS Pressing the Setup key while in normal weighing gives access to the Supervisor menus 13 1 When Setup is pressed and passcodes are not enabled the display will show the message SUPERVISOR If passcodes are enabled the balance will ask for it by displaying PASSCODE 0 If a wrong code is entered an ERROR CODE message will flash and the balance will return to weighing mode If the passcode has been enabled and entered the balance will allow the operator to access the Supervisor s menus When the display shows SUPERVISOR press Enter to view the parameters that can be modified From this menu the user can enable disable weighing units or modes set balance parameters for the conditions set time and date set parameters for the RS 232 interface calibration parameters and security parameters The Up and Down keys will cycle through the main parameters pressing the Enter key will enter the parameters and sub parameters or options can be set Press Mode to come out of a sub parameter or press Esc to return to normal weighing from any parameter ENABLE WEIGHING UNITS When UNITS is displayed press Enter The display will show the symbol for the first unit e g carats ct together with its enable state OFF or On The user can then enable or disable the carats u
18. ected weighing unit The available weighing units can be enabled or disabled by the user see section 13 1 Only weighing units that have been enabled will be cycled through when Units is pressed 9 3 1 Weighing Units You can select alternative weighing units to display the weight by pressing the Units key The common weighing units are Unit Symbol Models Conversion Factor Conversion Factor 1g 1 unit grams 1 Grams g All 1 1 0 2 Milligrams mg not 0 01g units 1000 0 001 3 Kilograms kg All 0 001 1000 4 Carats ct All 5 0 2000 5 Pennyweights dwt All 0 643014865 1 555174 6 Grains GN All 15 43236 0 0647989 7 Troy ounces ozt All 0 032150747 31 103476 8 Ounces OZ All 0 035273962 28 349523 It is possible to set the balance to display only grams one of the units enabled by default Grams will always be P N 8191 Revision A1 September 2006 Page 13 of 32 9 4 FUNCTIONS When weighing the user can access the applications that have been enabled see section 13 2 The following applications are available in this version 2 35 e Parts counting e Percent weighing The functions can be enabled or disabled using a similar method to the Units above by turning the functions to on or off 9 4 1 Parts Counting A known quantity of sample is first weighed to compute an average unit weight and then an unknown quantity of the sample is we
19. em in the analogue circuit board or power supplies can cause poor linearity Make sure all mechanical problems have been eliminated first OTHER PROBLEMS Cannot calibrate Zero shifted more than allowed Calibration timeout Check all flexures for damage Reset factory calibration Verify linearity and repeatability The balance may be unstable Verify stability as above Try using a more aggressive filter Calibration weight motor does not stop Check the cables to the motor try plugging the balance into the power again Look for friction in the calibration weight movement Check the flags that control motor position are correct RS 232 not working Doesn t print Check parameters match the device connected Verify cable is correct RS 232 circuits damaged Display dark keys beep Display contrast poor Cable unplugged or damaged Check the cables to the display Replace the display which could be damaged P N 8191 Revision A1 September 2006 Page 31 of 32 GE Manufacturer s Declaration of Conformity This product has been manufactured in accordance with the harmonised European standards following the provisions of the below stated directives Electro Magnetic Compatibility Directive 89 336 EEC Low Voltage Directive 73 23 EEC FCC COMPLIANCE This equipment has been tested and found to comply with the limits for a Class A digital device pursu
20. f the passcode has not been set the balance will continue as below The display will show zero reading along with the zero symbol 30 and the weighing unit last used If automatic yn HHHHE g time calibration is enabled the balance will calibrate after power up and again after the pre set time interval 9 2 PASSCODES If a passcode has been set to limit access to the weighing functions of the balance the display will show PASSCODES with the main digit set to zero The display will change to show 7 digits set to zero with the rightmost digit flashing Use the numeric entry method see section 7 1 to enter the code It will be necessary to enter the correct passcode to continue See the Section 13 6 for details P N 8191 Revision A1 September 2006 Page 12 of 32 9 3 WEIGHING e Press Tare to zero the balance if required e SH0 will be displayed e Place a mass on the pan and the weight will be displayed e lf acontainer is used press Tare to tare the balance when the stable symbol is on Net will be displayed to indicate that the balance is tared e When the display shows zero place the item to be weighed Only the net weight will be displayed e At any time the Units key can be pressed to select another unit Use the Up or Down key to scroll through the units and select the desired unit by pressing Enter the display will change to show the weight in the sel
21. he balance Keys Primary function Secondary function On Off To turn the balance to ON or OFF Tare or Esc A combined zero and tare function To escape from setup functions and modes Cal Up or A Starts the calibration function To increment or change a displayed value or scroll through options forward Print or Back Instructs the balance to print data To advance a flashing digit by one position to the left Setup or Enter Enters a function To save a value during setting up a function such as entering unit weight Mode 3 or Advance Selects functions by cycling through a set of enabled functions for example parts counting or percent weighing To advance a flashing digit by one position to the right To go back by one step during setup functions Units Y or Down Selects weighing units by cycling through a set of enabled units To decrement or change a displayed value or scroll through options backwards Mode 3 or Advance Selects functions by cycling through a set of enabled functions for example parts counting and percent weighing To advance a flashing digit by one position to the right To go back by one step during setup functions 7 1 NUMERIC ENTRY METHOD To set a value when required use the keys as given below Up and Down keys to increase or decrease the flashing digit
22. he balance is in stable condition It will turn off if the balance is not stable Exact zero is shown when the 90 symbol is on to the left of the display area P N 8191 Revision A1 September 2006 Page 8 of 32 6 0 DISPLAY a eae ae 8 meer custom Net Su MMITHS lboztdwt kactne aw Gms KQcimg This display includes areas for the weight value up to 7 digits symbols for common weighing units tare stability zero and low battery and a text area for menu The LCD has 7 x 7 segment digits for the weight and 10 x 14 segment digits for messages symbols for weighing units and indicators such as stability etc The 14 segment digits area is used to display messages concerning operation or errors The 10 digit text area is used to display the current weighing mode or to guide the user through the operation SYMBOLS AND INDICATORS The LCD has unique symbols to indicate the following 2 gt 0 Zero DD Stable g oz ozt GN dwt Text is shown for the weighing units and ct Kg mg Pcs modes CA When calibration is occurring or about to occur OO When a temperature is shown or a calibration is requested due to change in temperature tj For a time driven calibration Net When a net weight is shown P N 8191 Revision A1 September 2006 Page 9 of 32 7 0 KEYPAD The keypad has the following keys to operate t
23. ighed The net weight of this unknown sample is divided by the average unit weight to display the quantity The result is always a whole number The balance will have a preset number of parts to be used as a sample These values are 10 25 50 or 100 items e Press Mode to show parts counting PARTS will be displayed e Enter parts counting by pressing Enter e Press the Up or Down key to select the sample size REF QTY 10 25 50 100 etc then press Enter to confirm e When LOAD XX Pcs is shown place XX number of items on the pan and press Enter to compute the average piece weight e Remove the sample when display shows XX Pcs and then place an unknown quantity on the pan The balance will then compute the number of parts based upon the average piece weight The display will show the result in Pcs e To count another item press Mode and continue as before e Checks will be made to determine that the weight of the reference parts is large enough for reasonably accurate counting weight of each piece should be gt 1d e Toreturn to normal weighing press Mode to show REF QTY then press Esc P N 8191 Revision A1 September 2006 Page 14 of 32 9 4 2 Percent Weighing Percent weighing is carried out by defining a sample weight as 100 The sample weight can either be entered by the user or taken from a sample e Press Mode and then the Up or Down key to select Percent
24. ince last calibration exceeds a preset time typically 4 hours or 15 minutes after power is applied On the balances with internal calibration the calibration will be done automatically when the balance is at a stable zero The user knows a calibration is asked for by the flashing of the CAL symbol on the display The display will show a 5 second countdown when calibration will start If the user presses the Esc key the calibration will be delayed by one minute to allow time for a process to be finished If external calibration has been enabled the balance will call for a calibration by flashing the CAL symbol on the display As soon as the balance is calibrated the symbol will be turned off The Auto calibration feature can be enabled disabled or changed within the user options to meet the requirements of the users Calibration Errors Occasionally during calibration an error will be detected These errors can be caused by unstable readings improper weights being used large shifts of zero from the factory settings etc When an error is found a message will be shown and the calibration must be done again 11 0 RS 232 INTERFACE The balances have the ability to send data to the serial interface The weighing data can be sent over the interface either automatically or when the user presses the Print key The user has control over what data is to be printed The following gives a description of the RS 232 interface
25. l RS 232 interface e Can be configured to print a GLP Compliant report after each calibration to include the time date balance number and a verification of the calibration Automatic temperature compensation Display in 4 languages English French German and Spanish Multiple weighing units Date and time Easy to use sealed keypad Below balance weighing facility Password protection Security locking point Robust metal casing P N 8191 Revision A1 September 2006 Page 5 of 32 2 0 TECHNICAL SPECIFICATIONS 120g model 220g model Maximum capacity 120g 220g Readability 0 0001g Tare range Full Typical Repeatability 0 0002g Linearity 0 0003g Units of measure grams milligrams kilograms carats pennyweights grains troy ounce ounces Interface RS 232 bi directional Operating temperature 10 C 40 C Power supply 15 VDC 50 60 Hz 800 mA Calibration Calibration with internal mass Alternatively the user can chose to calibrate using an external mass Display Backlit LCD with dual digits 24 mm high Draught shield Supplied as standard factory fitted Housing Die cast aluminium housing With glass draught shield Draught shield 202 x 524 x 275 mm dimensions 7 95 x 20 6 x 10 8 Pan size 90 mm 3 5 Overall dimensions 265 x 524 x 275 mm w x d x h 10 4 x 20 6 x 10 8 Net weight 12 kg 26 4 Ib Applicati
26. lved first BALANCE IS NOT ACCURATE You must have accurate and trusted weights to test a balance If you suspect that the balance is not accurate then you must know your weights are accurate A balance calibrated using a bag of flour is not accurate even if it works OK otherwise Balance is not accurate Repeatability Eccentric loading Linearity Verify the balance shows the same value when the same mass is placed on the centre of the pan for a few tests Verify the balance shows the same reading within a tolerance depending upon the model when a mass is placed at positions around the pan Verify the balance is acceptable throughout the weighing range The balance must give acceptable readings from low weights up to the capacity Poor Repeatability Usually a mechanical problem Inspect the area around the pan for hair dust or other obstructions Inspect he mechanics for any possible problems Poor Eccentric loading A mechanical problem Inspect the area around the pan for hair dust or other obstructions Inspect he mechanics for any possible problems Readjust the Eccentric loading P N 8191 Revision A1 September 2006 Page 30 of 32 Poor Linearity Usually a mechanical problem Electronic Problems Re check repeatability Inspect the flexures for damage or loose hardware Use the Linearity Function in the service menu to reset linearity A probl
27. nit by using Up or Down Pressing Enter will confirm the setting and will advance to the next weighing unit Repeat for each weighing unit in turn Gram is always set to On Press Mode to advance to setting of the next menu or press Esc to return to normal weighing P N 8191 Revision A1 September 2006 Page 22 of 32 13 2 ENABLE WEIGHING MODES Same steps are followed to enable or disable the weighing modes e Press Enter when MODES is displayed The display will show the first mode i e Parts Counting PARTS together with its enabled state OFF or On The user can enable or disable the parts counting mode by using Up or Down Pressing Enter will confirm the setting and will advance to the next weighing mode Repeat for each mode in turn e Press Mode to advance to setting of the next menu or press Esc to return to normal weighing 13 3 ENABLE SERIAL INTERFACE PARAMETERS The parameters affecting the serial setup are set in a similar manner to the other parameters Press Enter when SERIAL is displayed to enter the sub menu The parameters that can be set are ENABLE The serial port can be set to On or OFF BAUD RATE _ Set the Baud Rate to 4800 9600 19200 or 38400 PARITY Set the Parity to NONE EVEN or ODD STABLE To print when stable On or regardless of stability OFF CONTINUOUS Set the RS 232 to send data continuously to On
28. on can also be initiated by a change in internal temperature or a set time period as determined by the user see section 13 5 10 1 1 10 1 2 Calibration using Internal Calibration mass Pressing Esc will abort the calibration at any time Check the display is at zero Tare if necessary Calibration will begin automatically When calibration is complete the balance will return to weighing Calibration using External Calibration mass Pressing Esc will abort the calibration at any time Check the display is at zero Tare if necessary Press the Cal key The display will show LOAD 0 to set a new Zero condition Ensure the pan is empty then press the Enter key The display will then show the value of the calibration mass required i e LOAD 100 g Put the mass on the balance Press Enter to continue After calibration is complete the balance will return to normal weighing Note The suggested external calibration weight for all analytical balances is 100g P N 8191 Revision A1 September 2006 Page 16 of 32 10 2 AUTOMATIC CALIBRATION The balance will have the ability to calibrate or ask for calibration when the balance has automatic calibration enabled and the conditions of the automatic calibration have been meet Conditions that will cause an automatic calibration are 1 Internal temperature change greater than a preset amount typically 0 5 C for the analytical balances 2 Time s
29. ons Weighing Parts counting Percentage weighing P N 8191 Revision A1 September 2006 Page 6 of 32 3 0 UNPACKING THE BALANCE Remove the balance from the packing by carefully lifting it out of the box Inside the box you will find everything needed to start using the balance ES OLA 4 0 LOCATING THE BALANCE AC adapter Square base plate Locating disc Weighing platform Guard ring Stainless steel top pan This User Manual NASA NON e The balance should not be placed in a location that will reduce the accuracy om e Avoid extremes of temperature Do not place in direct sunlight or near air conditioning vents TT e Avoid unsuitable tables The table or floor must be rigid and not vibrate e Avoid unstable power sources Do not use TT near large users of electricity such as welding t a equipment or large motors a y ey e Do not place near vibrating machinery e Avoid high humidity that might cause condensation Avoid direct contact with water Do not spray or immerse the balances in H water I I e Avoid air movement such as from fans or opening doors Do not place near open windows or air conditioning vents e Keep the balance clean Do not stack material on the balances when they are not in use P N 8191 Revision A1 September 2006 Page 7 of 32 5 0 SETTING UP THE BALANCE 5 1 5 2 AS
30. the Supervisor menus go to the PASSCODE section and reset the operator or Supervisor passcode using the 15 code as the old number when asked P N 8191 Revision A1 September 2006 Page 27 of 32 14 0 SAFETY AND MAINTENANCE CAUTION Use the AC adapter designed by the manufacturer for the balance Other adapters may cause damage to the balance Avoid overloading or dropping material onto the platform which could damage the balance Do not spill liquids on the balance as it is not water resistant Liquids may damage the case and if it gets inside the balance it may cause damage to the electronics Material that has a static electric charge could influence the weighing Discharge the static electricity of the samples if possible Another solution to the problem is to wipe both sides of the pan and the top of the case with an anti static agent 15 0 TROUBLE SHOOTING Service of this balance will generally be necessary when the balance does not perform as expected The balances are not user serviceable For Service Information see section 18 0 and contact your supplier Problems usually fall into one of the following categories User Problems The user is asking the balance for something it cannot do or is confused by the modes and functions of a balance It is also possible the user has set a parameter that has affected the balance operation Resetting the parameter to a normal value will restore operation
31. the current information is OK then press the Setup Enter key to move to the next line e g LINE No1 DATE prints date Select a code for one of the preset data formats as detailed above The next line shows LINE NO 2 TIME prints time Only one item can be entered per line Continue until the formatting of the form is complete There are 15 lines of possible data After the 15 line has been set or END has been selected the balance will return to the RS 232 Sub menu Press Mode to advance to setting of the next menu or press Esc to return to normal weighing P N 8191 Revision A1 September 2006 Page 24 of 32 13 4 SETUP PARAMETERS The user parameters that control the balance are shown under the SETUP When SETUP is displayed press the Setup Enter key The options for each parameter can be scrolled through by using the Up or Down key LANGUAGE English French German Spanish TIME Set Time using the numeric entry method see section 7 1 DATE DATE FORM EUROPE dd mm yy USA mm dd yy Set Date using the numeric entry method see section 7 1 INST ID Enter a user number to identify this balance BUZZER On Enable OFF Disable BACKLIGHT On OFF AUTO POWER DOWN Set the time after which the unit will go into Stand by power settings On Enable OFF Disable If set to On the options are 1 to 9 minutes FILT
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