Toploading Balances
EC Series
Digital Balance Operator’s Manual
Rev 1.01 June 2006 Software 2.11
Page: 1
CONTENTS
INTRODUCTION........................................................................................................ 3
SPECIFICATIONS .....................................................................................................4
TECHNICAL SPECIFICATIONS...................................................................4
COMMON SPECIFICATIONS ...................................................................... 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
TECHNICAL
CALIBRATION .........................................................................................................15
COMMUNICATION WITH A COMPUTER/PRINTER...............................................15
INPUT COMMANDS FORMAT:............................................................................ 16
ERROR MESSAGES...............................................................................................16
OF AUTO-SWITCH-OFF............................................................14
PARAMETERS...................................................................... 14
Page 2
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.
Page 3
SPECIFICATIONS
TECHNICAL SPECIFICATIONS
120g 400g 800g 2000g 4000g
Maximum
120g 400g 800g 2000g 4000g
Capacity
Readability
Tare Range
Repeatability
(s.d.)
Linearity ±
Pan
Units of
Measure
0.005g 0.01g 0.01g 0.05g 0.1 g
120g 400g 800g 2000g 4000 g
0.005g 0.01g 0.01g 0.05g 0.1 g
0.01g 0.02g 0.02g 0.1g 0.2 g
130mm / 5.125”
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.)
Page 4
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.
Page 5
• 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
[Zero]
PRIMARY FUNCTION
Sets the zero point for all
subsequent weighing. The display
shows zero.
SECONDARY FUNCTION
A secondary function is of "Enter" key
for setting parameters or other
functions.
[Tare]
[%]
[PCS]
[Units]
[Print]
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.
Enters the percent weighing
function.
Use this key to enter counting
mode from the normal weighing
mode,
Pressing this key will cycle through
the weighing units which are
enabled. It also scrolls through the
options during setting up a
parameter.
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.
Pressing [Tare] again will cancel the
tare value.
When in percentage mode, press [%]
key to return to 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.
Displays the unit weight, total weight
and the count when in the parts
counting mode.
Secondary function is to return to
normal operation when the scale is in a
parameter setting mode.
Page 6
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.
Page 7
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 bargraph 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.
Page 8
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.
Page 9
• To view the totals in memory press the [Print] key when the
balance is at zero. The display will show "ACC xx" (where “xx”
is the total number of readings) and the total weight, before
returning to zero.
• The total will also be printed via the RS-232 interface.
• To clear the memory, press [PCS] immediately after pressing
[Print].
PARAMETERS
• The balance has 5 parameters that can be chosen by the
user to set the scale.
• To set the parameters press the [Unit] key during self-
checking test.
• After a few seconds, the display will show the first function
"F1 UNT".
The following parameters are available:
FUNCTION DESCRIPTION
F1 UNT
F2 EL
Sets the units to be used (See section 5.1)
g / ct / Lb / OZ / d / GN / OZt / dWt / MM / TL.T / TL.C /
TL.t /t / N /g2.
Sets the backlight (See section 5.2)
EL on: backlight always on
EL AU: backlight automatically turns on when a key is
pressed
EL oFF: backlight always off
F3 SEr
F4 oFF
tECH
Sets the print parameters (See section 5.3)
Sets the auto switch-off parameter (See section 5.4)
Pressing [Zero] will allow the user to enter the technical
parameters setting mode. It is recommended not to
proceed with the settings of these parameters as those
are set up at the factory.
Page 10
SELECTING THE UNITS
• When “F1 Unt” is displayed, press the [Zero] key to view the
current settings of each unit.
• Press [Zero] again to cycle through the other units along with
their current settings. For example, if “oFF” is displayed with
the weighing unit Carats, the user will not be able to use this
unit while weighing.
• Press [Unit] to change the settings of a particular unit. For
example, to enable the weighing unit Carats, change the
setting to “on” by pressing [Unit] now.
• Use the [Print] key to leave a parameter unchanged.
• While weighing a sample, the display will show the weight
and the units of weight currently in use. To view the weight
in other units (which are enabled), press [Unit].
• The table on the following page shows different units which
are available to the user and the conversion factors for each.
Page 11
Sl.
No.
01 Grams A standard metric unit 1.0 g
02 Carats Used for weighing j ewellery and gems, etc. 5.0 ct
03 Pounds Standard weighing unit in UK/USA. 0.002205 Lb
04 Ounce Avoirdupois ou nce.
05 Drams An ancient unit of weight. Equals to 1/16th of
06 Grains A basic weighi ng unit in the imperial system.
07 Ounce Troy Troy ounce- used for weighing gold, silver and
08 Penny-
09 Mommes A weighing unit used in Japan to weigh
10 Taels Hk. Hong kong Taels- used to weigh coral, pearls,
11 Taels S. Singapore Taels 0.02646 TL.C
12 Taels T. Taiwan Taels 0.02675 TL.t
13 Tical An Asian weighing unit 0.08576 t
14 Newtons Used to measure force 0.009808 N
15 Grams Grams with last digit suppressed 1.0 g2
Name of the
Units
weight
Description Conversion
Factor
0.03528 OZ
16 ounces make a pound.
0.5645 d
an ounce.
15.432 GN
Used to weigh gun powder.
0.03216 OZt
in pharmacy.
Pennyweight was the weight of a silver penny
in medieval England. Equals to 1/20
Ounce Troy.
pearls.
etc.
th
of an
0.6432 dWt
0.26667 MM
0.02675 TL.T
Display
Symbol
SETTING OF THE BACKLIGHT
• The backlight may be enabled or disabled by the user.
• If the backlight is disabled, the battery life may be prolonged.
• The following settings are available:
EL AU
EL Off
EL On
Sets the backlight to operate automatically when a weight is
placed on the balance or a key is pressed.
Sets the backlight to be off.
Sets he backlight to be on for full time.
• When “F2 EL” is displayed, press the [Zero] key to view the
current setting for the backlight.
• Press [Unit] to scroll through other settings.
• Press [Zero] to store a particular setting.
• Use the [Print] key to leave a parameter unchanged.
Page 12
SETTING THE PRINTING PARAMETERS
When “F3 SEr” is displayed, press [Zero] to view the first printing
parameter.
Selecting the communication port
• The selected port, for example “S 232” will be displayed.
• Currently, only RS-232 interface is available and the balance
is set with this port only.
• Press [Zero], to view the next printing parameter.
Setting the print mode
• The current setting of the print mode is displayed,
• Press [Unit] to cycle through the other options.
• The following options are available:
P1 Prt
P2 Con
P3 AUT
The balance sends the accumulated weights to the
communication port, whenever the [Print] key is pressed.
It will set the RS-232 interface to print the weights
continuously and the accumulation function is disabled.
The weighing results will be sent to the communication port
automatically whenever a weight is placed on the platform.
• Press [Zero], to view the next printing parameter.
Setting the baud rate
• The current baud rate setting will be displayed.
• Press [Unit] to cycle through the other options.
• The following settings are available:
b 600
b 1200
b 2400
b 4800 (default value)
b 9600
• Press [Zero] to view the next printing parameter.
Page 13
Parity settings
• The current Parity setting will be displayed.
• Press [Unit] to cycle through the other options.
• The following settings are available:
8 n 1
7 E 1
7 0 1
8 data bits, no parity
7 data bits, even parity
7 data bits, odd parity
• Press [Zero], the display will go back showing “F3 SEr”.
• Press [Unit] to go to the next parameter which is “F4 oFF”.
SETTING OF AUTO-SWITCH-OFF
• The Auto switch-off time may be set up by the user.
• When “F4 oFF” is displayed, press the [Zero] key to view the
current setting for the backlight.
• Press [Unit] to scroll through other settings (0, 5, 10, 20 and
30 minutes).
• Press [Zero] to store a particular setting.
• Use the [Print] key to leave a parameter unchanged.
TECHNICAL PARAMETERS
• Next parameter is “tECH”. This allows the user to enter the
Technical Parameters section.
Note: It is recommended not to proceed with the settings of the Technical
Parameters which are set up at the factory and are often referred to as Service
Parameters. Check the Service Manuals for more details.
• Press [Print] to return to weighing. The balance will run the
self-test before displaying the zero along with the last
selected unit.
Page 14
CALIBRATION
• This parameter allows the user to calibrate the balance any
time deemed necessary.
• Switch the balance off and then on again by pressing
[On/Off]. During the self-test press [PCS] and [Print]
together.
• Display will show "unLoAd". Remove all weights from the
pan.
• Wait for the stability indicator to be on and then press [Zero].
• The display will then show the first calibration weight request.
• Press [Unit] to scroll through the other calibration weights.
• Press [Zero] to select calibration weight. The display will
show “LoAd”.
• Place this weight on the platform and press [Zero] when the
stability indicator will be on to show the value is stable.
• If the calibration is complete, the balance will show “PASS”
and will show the weight put on the balance.
• If the wrong calibration weight is used, the balance will show
“FAlL H” (when the weight is higher) or “FAlL L” (when the
weight is lower). Repeat the process using the correct
calibration weight.
Calibration weights:
Model # 120g 400g 800g 2000g 4000g
Weight 1 60g 200g 400g 1000g 2000g
Weight 2 120g 400g 800g 2000g 4000g
Weight 3
COMMUNICATION WITH A COMPUTER/PRINTER
These Compact Portable Balances come with a standard RS-232
interface.
The Standard Interface Parameters are: Connection Details are:
RS-232 output of weighing data
ASCII code
4800 Baud
8 data bits
No Parity
Connector: 9 pin d-subminiature female
socket
Pin 3 Output from the balance
Pin 2 Input to the balance
Pin 5 Signal Ground
Page 15
Data Format for normal weighing operations, parts counting or recalling
of totals from memory will all be different.
Normal Output: G S _ X X X . X X u u u
GS 123.45g GS for Gross Weight, NT for Net Weight and u for unit of weight
No. 1 This number increments every time a new value is stored in memory
Total 123.45g The total value stored in memory
<lf> Includes 2 line feeds
<lf>
Input commands format:
The balance can be controlled with the following commands. The commands must
be sent in upper case letters, i.e. “T” not “t”.
T<cr><lf>
Z<cr><If>
T5.345<cr><if>
P<cr><lf>
Tares the balance to display the net weight. This is the same as
pressing [Tare] key.
Sets the zero point for all subsequent weighing. Display shows zero.
Would be same as entering a preset tare value of 5.345 from keypad
Prints the results to a PC or printer using the optional RS-232 interface.
It also adds the value to the accumulation memory if the accumulation
function is not set to automatic.
ERROR MESSAGES
During the initial power-on testing or during operation it is possible that the balance
may show an error message. The meaning of the error messages is described below.
ERROR CODE DESCRIPTION POSSIBLE CAUSES
Err 4
Err 5
Err 6
Err 9
If an error message is shown, repeat the procedure that caused the message such as
turning the balance off / on, calibration or any other functions. If the error message is still
shown, contact your dealer for further support.
Initial Zero is greater than
allowed (4% of maximum
capacity) when power is
turned on or when the
[Zero] key is pressed,
Keyboard Error.
A/D count is not correct
when turning the balance
on
A/D count is not stable
when turning the balance
on
• Weight on the pan when turning on.
• Excessive weight on the pan when
zeroing the balance.
• Improper calibration of the balance.
• Damaged load cell.
• Damaged Electronics.
• Improper operation of the balance.
• Load cell damaged.
• Electronics damaged.
• Initial instability during turning on
which will get adjusted automatically
• There may be movement, vibration
or dirt on balance during turning on.
Page 16
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,
pursuant 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 use r's authority
to operate the equipment.
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