Symmetry PR series User Manual

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PR Series

Precision Toploading Balances

USER MANUAL

(

Software Revision: 2.35)

P.N. 8190, Revision A1, September 2006

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P.N. 8190, Revision A1, September 2006

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P.N. 8190, Revision A1, September 2006

CONTENTS

1.0 INTRODUCTION ..........................................................................................................4

2.0 TECHNICAL SPECIFICATIONS...................................................................................5

3.0 UNPACKING THE BALANCE.......................................................................................6

4.0 LOCATING THE BALANCE..........................................................................................6

5.0 SETTING UP THE BALANCE ......................................................................................7

5.1 ASSEMBLING THE BALANCE .............................................................................7

5.2 LEVELLING THE BALANCE.................................................................................7

5.3 WARM-UP TIME ...................................................................................................7

6.0 DISPLAY...................................................................................................................8

7.0 KEYPAD.......................................................................................................................9

7.1 NUMERIC ENTRY METHOD................................................................................9

8.0 INPUT/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

13.5 CALIBRATION SETUP........................................................................................24

13.6 PASSCODES......................................................................................................25

13.6.1 Forgotten Passcodes ...................................................................................25

14.0 SAFETY AND MAINTENANCE ................................................................................26

15.0 TROUBLE-SHOOTING.............................................................................................26

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P.N. 8190, Revision A1, September 2006

1.0 INTRODUCTION

Thank you for selecting the Precision 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 Precision 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

• 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

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P.N. 8190, Revision A1, September 2006

2.0 TECHNICAL SPECIFICATIONS

210g model 410g model 2200g model 4200g model

Maximum capacity

210g 410g 2200g 4200g

Readability 0.001g 0.01g Typical Repeatability

0.002g 0.02g

Linearity (±) 0.003g 0.03g Tare range Full 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 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 mm x 175 mm /

7.9” x 6.9” Overall dimensions (w x d x h)

251 × 358 × 104 mm /

10” x 14.3” x 4.2”

Net weight 5.5 kg / 12 lb Applications Weighing, Parts counting, Percentage weighing

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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-

 AC adapter  Four plastic pan supports  Stainless Steel Top Pan

 Breeze / draught shield (For 0.001g models) 

This User Manual

4.0 LOCATING THE BALANCE

• The balance should not be placed in a location that will reduce the accuracy.

• Avoid extremes of temperature. Do not 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 balances in water.

• Avoid air movement such as from fans or opening doors. Do not place near open windows or air-conditioning vents.

• Keep the balance clean. Do not stack material on the balances when they are not in use.

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5.0 SETTING UP THE BALANCE

5.1 ASSEMBLING THE BALANCE

• Locate the balance on a solid surface, free from vibration

• Gently place the 4 pan supports (if not already fitted) and then the

stainless steel pan on the weighing platform

• Place the windshield frame and the top cover around the pan (for

0.001g models)

• Level the balance using the adjustable feet and spirit level

• Connect power to the balance

• For best performance, let the balance warm up for 30-60 minutes and

calibrate before using

5.2 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.

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 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.

A stable sign ~ is shown when the balance is in stable condition. It will turn off if the balance is not stable. Exact zero is shown when the

“0“

symbol is on to the left of the display area.

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6.0 DISPLAY

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:

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 temperature is shown or a calibration is requested due to change in temperature

“ti”

For a time driven calibration

“Net”

When a net weight is shown

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7.0 KEYPAD

The keypad has the following keys to operate the 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] / or  [Up]

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] /  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] /  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 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,

- [Advance] and [Back] keys to advance or move back the digit and

- [Enter] key to accept the value

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8.0 INPUT/OUTPUT

The rear panel has connectors for RS-232 serial and buffered I

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 I

C to the desired protocol. The basic unit includes RS-232 serial communications only.

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9.0 OPERATIONS

9.1 INITIALISATION

When the balance is first switched on, it will display the balance serial number (if set), software revision, model capacity 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. 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 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.

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P.N. 8190, Revision A1, September 2006

9.3 WEIGHING

• Press [Tare] to zero the balance, if required

• “0 “ 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] 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 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 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. Grams will always be one of the units enabled, by default.

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P.N. 8190, Revision A1, September 2006

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):

• Parts counting

• 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 weighed. 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.

• 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 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

• To count another item press [Mode] and continue as before

• 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 > 1d)

• To return to normal weighing, press [Mode] to show “REF QTY” then press [Esc]

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P.N. 8190, Revision A1, September 2006

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

• Press [Mode] and then the [Up] or [Down] key to select Percent weighing, “PERCENT” will be displayed

• Press [Enter] to enter the function

• Display will show, “PERCENT SAMPLE”

• Press [Enter] to select the sample method

• When “LOAD 100 %“ is shown, add the sample

• Press [Enter] to set this weight to be 100%. When ready the display will

show “100%”

• Remove the 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 display the percentage weight

• To perform percent weighing with another sample press [Mode] and

continue as before

• To return 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.

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10.0 CALIBRATION

The balances are calibrated using an external mass.

• Press the [Cal] key to start calibration.

• Pressing [Esc] will abort the calibration at any time

• Check the display is at zero. Tare, if necessary

• Press the [Cal] key

• Display will show “LOAD 0”. Ensure the pan is empty and press [Enter]

• The balance will then show the value of the calibration mass required,

for example “LOAD 2000 g”

• Place the suggested mass on the balance. Press [Enter] to continue

• When the calibration is complete, balance will return to normal weighing

The balance will have the ability to ask for calibration when the following conditions occur. This feature can be enabled or disabled by the user (see section 13.5). The conditions 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 calibration will be delayed by one minute to allow for a process in progress to be finished. As soon as the balance is calibrated the symbol will be turned off.

Suggested calibration weights

210g model 200g 410g model 200g 2200g model 2000g 4200g model 2000g

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.

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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.

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 (<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 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

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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: xx.xxx % A blank line printed <CR><LF> 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).

The data for each form will be preceded by a start-of-header <SOH> character (01) and terminated with an end-of-transmission <EOT> 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 %”

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INPUT COMMANDS USING 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 <CR> as shown below).

Basic Input Commands:

!KT<CR>

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.

!KS<CR> 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.

!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 pressing the [Cal] key

when the balance is in the normal weighing mode.

!KU<CR> 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 invalid command is received, then the command is returned as follows-

Invalid Command Message returned Remarks

!NT<CR> !EU<CR> Command character is not ‘K’ !KK<CR> !EK<CR> Key charac ter is not ‘T’, ‘S’, ‘P’, ‘M’, ‘C’

or ‘U’

!KT-<CR> !EF<CR> Command format error, <CR> is not

the fourth character KT<CR> or !KT -

No reply Either ‘!’ or <CR> is missing in the

command string

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P.N. 8190, Revision A1, September 2006

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

ERROR St

Calibration could not be completed because the results were not stable

ERROR LO or ERROR HI

Calibration constant not within 20% of old calibration constant

Concerning weighing

ERROR LO Weight display is below zero by >4%max ERROR HI Weight is above maximum plus 90d

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13.0 SUPERVISOR MENUS

Pressing the [Setup] key while in normal weighing gives access to the Supervisor menus.

• 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

13.1 ENABLE WEIGHI NG 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 unit 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

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13.2 ENABLE WEIGHI NG MODES

Same steps are followed to enable or disable the weighing modes.

• 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

• 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 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).

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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 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.

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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

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 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

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The sub-menu is entered by pressing [Enter] –

• 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

• 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.

• Press [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 hours OFF = Disabled

TEMP CAL On = Enabled. If set to On, set the

temperature variation from 0.2 to 4°C OFF = Disabled

Press [Mode] to advance to setting of the next menu which is “PASSCODES” or [Esc] to return to normal weighing.

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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 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.

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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 Precision Balance will generally be necessary when the balance does not perform as expected. The balances are not userserviceable. 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.

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.

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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 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

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to look for sources of friction.

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 resolved 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

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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 problem in the analogue circuit board

or power supplies can cause poor linearity. Make sure all mechanical problems have been eliminated first

Symmetry PR series User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual