Symmetry EC Series User manual

EC Series
Toploading Balances
Digital Balance Operator’s Manual
Rev 1.01 June 2006 Software 2.11

Page: 1

Page 2
CONTENTS
INTRODUCTION........................................................................................................3
SPECIFICATIONS .....................................................................................................4
TECHNICAL SPECIFICATIONS...................................................................4
COMMONSPECIFICATIONS ......................................................................4
INSTALLATION..........................................................................................................5
LOCATING THE BALANCE..........................................................................5
SETTING UP THE BALANCE.......................................................................5
KEY DESCRIPTIONS...................................................................................6
OPERATION..............................................................................................................7
ZEROING THE DISPLAY..............................................................................7
TARING........................................................................................................7
WEIGHING...................................................................................................8
PERCENT WEIGHING .................................................................................8
PARTS COUNTING......................................................................................9
ACCUMULATION.........................................................................................9
PARAMETERS ........................................................................................................10
SELECTING THE UNITS............................................................................11
SETTING OF THE BACKLIGHT..................................................................12
SETTING THE PRINTING PARAMETERS.................................................13
Selecting the communication port ..........................................................13
Setting the print mode ............................................................................13
Setting the baud rate..............................................................................13
Parity settings.........................................................................................14
SETTING OF AUTO-SWITCH-OFF............................................................14
TECHNICAL PARAMETERS......................................................................14
CALIBRATION .........................................................................................................15
COMMUNICATION WITH A COMPUTER/PRINTER...............................................15
INPUT COMMANDS FORMAT:............................................................................16
ERROR MESSAGES...............................................................................................16

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INTRODUCTION
•This series of balances are simple and easy to use.
•The balance can be operated with an A.C. adapter or using 6 AA
batteries.
•The weighing process is fast and accurate, making it suitable for the
general purpose weighing applications, parts counting, percentage
weighing functions, etc.
•There are 5 models in this series with capacities ranging from 120g
to 4 kg.
•All models include automatic zero tracking, automatic tare,
accumulation facility that allows the weight to be stored and recalled
as an accumulated total and bi-directional RS-232 interface for
communicating with a PC or printer.
•All have stainless steel weighing platforms on an ABS plastic base
assembly.
•Keypads are and use hard contact switches.
•The displays are large, easy to read liquid crystal type displays
(LCD). It is provided with a backlight and also a bar-graph at the
bottom to display the weight of the item on the pan with respect to
the capacity of the scale.
•The LCD normally shows the weight and the units of the weight
selected previously (Grams, Carats, Pounds, etc). See section 5.1
for details on Units.

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SPECIFICATIONS
TECHNICAL SPECIFICATIONS
120g 400g 800g 2000g
4000g
Maximum
Capacity 120g 400g 800g 2000g
4000g
Readability 0.005g 0.01g 0.01g 0.05g 0.1 g
Tare Range 120g 400g 800g 2000g
4000 g
Repeatability
(s.d.) 0.005g 0.01g 0.01g 0.05g
0.1 g
Linearity ± 0.01g 0.02g 0.02g 0.1g 0.2 g
Pan 130mm / 5.125”
Units of
Measure g/ ct / Lb / OZ / d / GN / OZt / dWt / MM / TL.T / TL.C / TL.t /t / N /g2.
COMMON SPECIFICATIONS
Interface RS-232, bi-directional
Stabilisation Time 2 Seconds typical
Operating Temperature 0°C - 40°C / 32°F - 104°F
Power supply (external) 12vAC 150mA
Calibration Automatic External
Display 16mm high 6 digits LCD
With auto backlight and loading bar graph
Balance Housing ABS Plastic with Stainless Steel platform
Overall Dimensions (wxdxh) 260mm x 195mm x 85mm / 10.5” x 7.875” x 3.375”
Net Weight 1.5 kg (3.3 lb.)

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INSTALLATION
LOCATING THE BALANCE
•Avoid extreme temperatures. Do not place the balance in
direct sunlight or near air conditioning vents. Avoid air
movement such as from fans, people walking past the
balance constantly or opening of doors and windows.
•Avoid unsuitable tables. The table or floor must be rigid and
not vibrate. Do not place near vibrating machinery.
•Avoid unstable power sources. Do not use the balance near
any large user of electricity such as welding equipment or
large motors.
•Avoid high humidity that might cause condensation. Avoid
direct contact with water. Do not spray or immerse the scales
in water.
•Keep the weighing area clean.
•Do not stack material on the balance when not in use.
•Protect the scale from extreme temperatures, vibration and
dust.
SETTING UP THE BALANCE
•The balance comes with a plastic and stainless steel top pan,
packed loose in the box.
•Place the plastic top pan in the receptacle on the top cover
and then put the stainless steel top pan in position.
•Do not press with excessive force on the top pan as it could
damage the load cell inside.
•Level the balance by adjusting the four feet. The balance
should be adjusted such that the bubble in the spirit level is
in the centre of the level and the balance is supported by all
four feet.

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•Turn the power on by pressing the [On/Off] switch located
underneath the balance on the right hand side.
•The unit will display the model number and the software
revision number for a while and then will count down
performing a self-test.
•When ready the display will show zero along with the
weighing unit selected during the last operation.
KEY DESCRIPTIONS
KEYS PRIMARY FUNCTION SECONDARY FUNCTION
[Zero]
Sets the zero point for all
subsequent weighing. The display
shows zero.
A secondary function is of "Enter" key
for setting parameters or other
functions.
[Tare]
Tares the balance. Stores the
current weight in memory as a tare
value, subtracts the tare value from
the weight and shows the results.
This is the net weight.
Pressing [Tare] again will cancel the
tare value.
[%] Enters the percent weighing
function.
When in percentage mode, press [%]
key to return to normal weighing mode.
[PCS] Use this key to enter counting
mode from the normal weighing
mode,
A secondary function allows the user to
return to normal weighing mode while in
counting mode. It also clears the
accumulated value from the memory
when pressed during recalling the total.
[Units]
Pressing this key will cycle through
the weighing units which are
enabled. It also scrolls through the
options during setting up a
parameter.
Displays the unit weight, total weight
and the count when in the parts
counting mode.
[Print]
To print the results to a PC or
printer using RS-232.
It also adds the value to the
accumulated memory if the
accumulation function is not
automatic.
Secondary function is to return to
normal operation when the scale is in a
parameter setting mode.

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OPERATION
ZEROING THE DISPLAY
•Press the [Zero] key when the platform is empty.
•[Zero] key may be pressed at any time to set the zero point
from which all other weighing and counting is measured.
•When the zero point is obtained the “O” indicator will be on in
the top left hand corner of the LCD.
•The balance has an automatic re-zeroing function to account
for minor drifting or accumulation of material on the platform.
However you may need to press the [Zero] key to re-zero
the balance if small amounts of weight are shown when the
platform is empty.
TARING
•Zero the balance by pressing the [Zero] key, if necessary.
•The “O” indicator will be on.
•Place a container on the platform, a value for its weight will
be displayed.
•Press the [Tare] key to tare the balance. The weight that was
displayed is stored as the tare value. It is subtracted from the
displayed value, leaving zero on the display. The NET
symbol will be on at the right top corner to indicate that the
weight displayed is the net weight.
•As the product is added, only the net weight will be shown.
•The balance could be tared a second time if another type of
product was to be added to the first one. Again only the
weight that is added after taring will be displayed.
•When the container is removed a negative value will be
shown. If the balance was tared just before removing the
container, this value is the gross weight of the container plus
all products those were removed.
•The “O” indicator will also be on because the platform is back
to the same condition as it was when the [Zero] key was last
pressed.
•To cancel the tare value, press [Tare] again.

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WEIGHING
•After zeroing the display and taring the container, place the
sample in the container to determine the weight of the
sample. The weight will also be displayed through a bar-
graph at the bottom of the LCD.
•The display will show the weight and the units of weight
currently in use. The stable indicator will be on. To
change the weighing units, press [Units] to cycle through the
options of units those are enabled. See the Parameter
section to enable or disable the weighing units.
•The accumulated value in the memory will be cleared when
selecting a new weighing unit or when recalling the memory,
% weighing or parts counting is also selected.
PERCENT WEIGHING
•The balance will allow a sample weight to be shown as
100%. Then any other weight placed on the balance will be
displayed as a percentage of the original sample.
•For example is 350g is placed on the scale and the [%] key
is pressed the display will show 100.00%. Removing the
350g weight and place a 300g weight on the balance. The
display will show 85.71% as 300g is 85.71% of 350g.
•Pressing the [%] key again will return the balance to normal
weighing.

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PARTS COUNTING
•Before beginning, tare the weight of any container that will be
used, leaving the empty container on the balance.
•Place the number of samples on the balance. The number
must match the options for parts counting, 10, 20, 50, 100 or
200 pieces.
•Press the [PCS] key.
•The balance will initially show "SP 10" asking for a
sample size of 10 parts. Press [Units] to cycle through the
options: 10, 20, 50, 100, 200 and back to 10.
•Press [PCS] again when the number matches the number of
parts used for the sample. As more weight is added the
display will show the number of parts (PCS) with respect to
the chosen sample size.
•Press [Units] to display unit weight (W/P), total weight (g) or
the count (PCS). The total and the unit weight are shown in
the current units.
•Press [PCS] to return to normal weighing.
ACCUMULATION
•When the balance is set for automatic accumulation, the
weight will be added to the memory when the balance
becomes stable. The balance must return to zero before
another weight is added !
•When the balance is set to manual accumulation (See the
Parameter Section) the weight displayed will be stored in
memory when the [Print] key is pressed and the weight is
stable.
•The display will show "ACC 1" followed by the total value in
the memory for 2 seconds before returning to displaying the
weight of the item on the balance.
•The weight will be output to a printer or PC.
•Remove the weight, allowing the balance to return to zero
and put a second weight on.
•Press [Print], the display will show "ACC 2" followed by the
new total in the memory for 2 seconds before returning to
displaying the weight of the item on the balance.
•Continue until all weights have been added.