Symmetry PR series User Manual Download

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Page 12 of 32

P.N. 8190, Revision A1, September 2006

9.3 WEIGHING

•

Press

[Tare]

to zero the balance, if required

•

“



“ will be displayed

•

Place a mass on the pan and the weight will be displayed

•

If a container 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

•

When the display shows zero, place the item to be weighed. Only the

net weight will be displayed

•

At any time the

[Units]

key can be pressed to select another unit. Use

the

[Up]

[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 selected 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

1g =

Conversion Factor

1 unit = grams

1. Grams

All

1.0

Milligrams

not 0.01g units

1000

0.001

3. Kilograms

All

0.001

1000

4. Carats

All

0.2000

5. Pennyweights

dwt

All

0.643014865

1.555174

6. Grains

All

15.43236

0.0647989

7. Troy

ounces

ozt

All

0.032150747

31.103476

8. Ounces

All

0.035273962

28.349523

It is possible to set the balance to display only grams. Grams will always be
one of the units enabled, by default.

Summary of Contents for PR series

Page 1: ...PR Series Precision Toploading Balances USER MANUAL Software Revision 2 35 P N 8190 Revision A1 September 2006 ...

Page 2: ...Page 2 of 32 P N 8190 Revision A1 September 2006 ...

Page 3: ...NPUT OUTPUT 10 9 0 OPERATIONS 11 9 1 INITIALISATION 11 9 2 PASSCODES 11 9 3 WEIGHING 12 9 3 1 Weighing Units 12 9 4 FUNCTIONS 13 9 4 1 Parts Counting 13 9 4 2 Percent Weighing 14 10 0 CALIBRATION 15 11 0 RS 232 INTERFACE 16 12 0 ERROR CHECKING 19 13 0 SUPERVISOR MENUS 20 13 1 ENABLE WEIGHING UNITS 20 13 2 ENABLE WEIGHING MODES 21 13 3 ENABLE SERIAL INTERFACE PARAMETERS 21 13 4 SETUP PARAMETERS 23 ...

Page 4: ...ision Balance is ideal for laboratory and general purpose weighing FEATURES Large easy to read LCD display with backlight Applications include weighing parts counting and percentage weighing External calibration Bi directional RS 232 interface 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 Autom...

Page 5: ...RS 232 bi directional Operating temperature 10 C 40 C Power supply 15 VDC 50 60 Hz 800 mA Calibration External Selectable automatic calibration due to change in time or temperature Display Backlit LCD with dual digits 24 mm high Draught shield Supplied as standard for 0 001g units Housing Die cast aluminium housing With glass draught shield for 0 001 g units Pan size 140 mm x 140 mm 5 5 x 5 5 200 ...

Page 6: ...ot place in direct sunlight or near air conditioning vents Avoid unsuitable tables The table or floor must be rigid and not vibrate Avoid unstable power sources Do not use near large users of electricity such as welding equipment or large motors Do not place near vibrating machinery Avoid high humidity that might cause condensation Avoid direct contact with water Do not spray or immerse the balanc...

Page 7: ...e bubble in the spirit level is centred 5 3 WARM UP TIME 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 zeroes ac...

Page 8: ...d 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 0 Zero Stable g oz ozt GN dwt ct Kg mg Pcs Text is shown for the weighing units and modes CAL When calibration is occurring or about to occur ºC When a temperat...

Page 9: ... 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 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 or Advance Selects functions by cycling through a set of enab...

Page 10: ...quired 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 I2 C to the desired protocol The basic unit includes RS 232 serial communications only P N 8190 Revision A1 September 2006 ...

Page 11: ...ected User menus If the passcode has not been set the balance will continue as below The display will show zero reading along with the zero symbol 0 and the weighing unit last used If automatic 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 bala...

Page 12: ...he weight in the selected 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 1g Conver...

Page 13: ... number of parts to be used as a sample These values are 10 25 50 or 100 items Press Mode to show parts counting PARTS will be displayed Enter parts counting by pressing Enter Press the Up or Down key to select the sample size REF QTY 10 25 50 100 etc then press Enter to confirm When LOAD XX Pcs is shown place XX number of items on the pan and press Enter to compute the average piece weight Remove...

Page 14: ... sample and place an unknown sample to display the percentage weight To set another weight as 100 press Mode and continue as before 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 Press Enter to select the manually entered weight method Enter the weight using the numeric entry method see section 7 1 Place unknown sample to displ...

Page 15: ...nditions are 1 Internal temperature change greater than a preset amount typically 2ºC 2 Time since last calibration exceeds a preset time typically 4 hours or 15 minutes after power is applied The user will know a calibration is asked for from 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 calibra...

Page 16: ...y NONE 8N1 EVEN 7E1 or ODD 7 O 1 All lines are terminated with carriage return and line feed CR LF 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 CR LF 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 selec...

Page 17: ...he 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 lin...

Page 18: ... in this table which will perform the same key functions as described in section 13 0 KP CR Transmits data over RS 232 interface This is the same as pressing the Print key when the balance is in the normal weighing mode KM CR Enters the Modes section This is the same as pressing the Mode key when the balance is in the normal weighing mode KC CR Enters the Calibration section This is the same as pr...

Page 19: ...rors 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 ERROR St Calibration could not be completed because the results were not stable ERROR LO or ERROR HI Calibration constant not...

Page 20: ...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...

Page 21: ...ERIAL 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 regard...

Page 22: ...de 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 the current information is OK then press the Setup Enter key t...

Page 23: ...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 FILTER Set a value for the amount of filtering to be done set a value of 5 10 20 30 40 or 50 A larger number is more filtering and a slower respon...

Page 24: ...Enter when CAL SETUP is displayed to select the calibration parameters 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 h...

Page 25: ...he 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 acces...

Page 26: ...NG Service of this Precision 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 balanc...

Page 27: ...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 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 sta...

Page 28: ...ccurate 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 ...

Page 29: ...ut 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 c...

Page 30: ...Page 30 of 32 P N 8190 Revision A1 September 2006 ...

Page 31: ...ainst 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 b...

Page 32: ...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 materia...

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