Symmetry ED series User manual

ED Series
Portable Toploading Balances
Digital Balance Operator’s Manual
Revision: 1.01
2006

Contents
Page 3
Introduction...................................................................... 4
Specifications...................................................................5
Safety Precautions ...........................................................6
Parts Descriptions............................................................ 7
Preparation...................................................................... 8
Operation.........................................................................9
Functions......................................................................... 10
Calibration........................................................................12
Technical Support ............................................................ 14

Introduction
The compact balances are specifically designed for educators with the main
features being as follows:
• Runs using battery or AC Adapter supplied as standard
• Auto power off to save the battery
• Low battery indicator
• Net weight/stability indication
• Auto zero tracking
• Various weighing units available
• Integral security bracket
• Spirit level for balancing
• Large LCD (6 digits 15 mm high)
• Auto backlight
• Large stainless steel weighing pan
• Auto calibration using the keypad
Page 4

Specifications
Model # 150g 300g 500g 1200g 2000g 4000g
Maximum
Capacity 150g 300g 500g 1200g 2000g 4000g
Readability 0.01g 0.1g 0.1g 0.1g 0.1g 1g
Repeatability
(Std Dev) 0.02g 0.1g 0.1g 0.2g 0.2g 1g
Linearity ± 0.02g 0.1g 0.1g 0.2g 0.2g 1g
Units of
Measure
g/ct./ oz/
dwt/ tLT/
tLS/ tLH
g / ct. / oz. / dwt kg / g / lb /oz
Stabilisation
Time 3 seconds 2 seconds
Operating
Temperature
0ºC to 40ºC
32ºF to 104ºF
Power
Supply 12VAC @ 150mA adapter or 6x AA batteries
Calibration Push button calibration using external mass
Calibration
Mass
100g
or
150g
200g
or
300g
200g
or
500g
1000g
or
1200g
1000g
or
2000g
2000g
or
4000g
Display 6 digit LCD, 15mm digits, with backlight
Balance
Housing ABS Plastic
Pan Size 130mm diameter (5.1” diameter)
Overall
Dimensions
(w x d x h)
195 x 240 x 70mm
(7.7” x 9.4” x 2.8”)
Net Weight 1.2 kg. (2.6 lb)
Features Low battery, Stable and Zero indications
Page 5

Safety Precautions
All safety messages are identified by the following words “WARNING” and
“CAUTION”. These words mean the following:
WARNING - Important information to alert you to a situation that might cause
serious injury and damage to your property if instructions are not followed.
CAUTION -Important information that tells how to prevent damage to equip-
ment.
When using the balance, following safety precautions should always be fol-
lowed
WARNING
Use the AC adapter designed by the manufacturer for the balance. Other
adapters may cause damage to the balance.
CAUTION
Avoid installing the balance in direct sunlight- this may cause poor
performance or malfunctions.
Do not mix different type of batteries. Replace all the batteries at the
same time.
If the balance is not to be used for a long period of time, remove all
batteries from the battery compartment to avoid leakage which may
cause damage to the instrument.
Avoid overloading or dropping material onto the platform as that
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 weigh-
ing. 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.
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•
•
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Page 6

Parts Description
BEHIND
AC adapter socket
Page 7
TOP
Stainless Steel pan
Shipping protection screw
Weighing platform
KEYS
[On/Off] key
Turns the balance power on/off
[Units] key
Changes weighing units. Also used when
calibrating
[Tare] key
Sets display to zero or tares the container
BOTTOM
Battery compartment
Battery compartment cover
(Batteries are not included)

Preparation
Page 8
SETTING UP THE BALANCE
CAUTION
Avoid installing the balance in direct sunlight that may cause poor
performance or malfunctions.
Place your balance on a firm weighing table so that the balance is
levelled (The balance will not perform accurately when it is not levelled).
Level the balance by adjusting the feet to centre the bubble in the
spirit level.
Remove the shipping protection screw along with the round cover as
shown below.
Shipping protection screw
Round cover around the screw
Place the platform (comes separately packed) in the receptacles on
the top cover. Secure the platform using the shipping protection screw
after taking it out from the round cover. Place the stainless steel pan.
(See the diagram on page 6).
Do not press with excessive force as it could damage the load cell
inside.
Place the balance on a firm and flat surface for accurate weighing.
INSTALLING BATTERIES AND POWER
Remove the battery compartment cover and insert six batteries (R6P/LR6
/AA size) into the battery compartment. Take extreme care in placing the
positive and negative polarities correctly. Plug in the AC adapter into the
socket at the rear of the balance. The AC input requirement could be 100,
120, 220, 230 or 240 Volts (50/60Hz) depending on the location where it is
used. Verify the adapter is correct.
•
•
•
•
•
•
•

Page 9
Operation
BEFORE WEIGHING
Be aware of the Automatic power-off function. If the Automatic power-off
function is active it will turn the balance off after 2 minutes of inactivity.
WEIGHING PROCEDURES
Press [On/Off] to turn on the balance
When power is turned on, all display segments appear on LCD for a few sec-
onds and finally on the display “0.00” will appear along with the last selected
units.
To select the weighing unit with [Unit] (if required)
Press [Unit] to select a weighing unit, eg. “g” / “ct” / “oz” or “dwt” .
Once the unit has been selected, the weight will be displayed in the selected
unit and a symbol for the weight will be shown.
Start weighing
If you do not use a container for weighing
Verify the reading is “0.00”. If not, press [Tare] to display “0.00”.
Place the objects on the weighing pan to weigh.
When the reading becomes stable, the stable indicator is displayed.
If you use a container for weighing
Place an empty container on the pan.
Wait for the stability indicator to be displayed and press [Tare].
Place the objects to be weighed in the container.
When the reading becomes stable, the stable indicator is displayed.
Only the net weight is displayed.
1)
2)
3)
1)
2)
3)
4)
5)

Page 10
Functions
FUNCTION SETTINGS
Auto Shut Off Mode
Press [On/Off] to turn the power off.
Press [Tare] first, then press [On/Off], while keeping [Tare] pressed.
The display will show “A-On” or “A-OFF”.
Press [Unit] to select auto shut off setting mode.
Press [Tare] to choose “On” or “OFF” mode,
“A-On” means auto shut off function is active.
“A-OFF” means this function is inactive.
5) Turn off the power and then turn it on again to enter the normal
weighing mode. The delay time will be about 2 minutes.
Auto Backlight Mode
Press [On/Off] to turn the power off.
Press [Tare] first, then press [On/Off], while keeping [Tare] pressed.
The display will show “A-On” or “A-OFF”.
Next press [Unit] to enter the backlight setting mode. The display
will show “L-On” or “L-OFF”.
Press [Tare] to choose “On” or “OFF” mode,
“L-On” means auto backlight function is active.
“L-OFF” means this function is inactive, i.e. backlight is shut off.
5) Turn off the power and then turn it on again to enter the normal
weighing mode.
1)
2)
3)
4)
1)
2)
3)
4)

Page 11
Enable Units Selection (for 150g capacity unit only)
Press [On/Off] to turn the power off.
Press [Tare] first, then press [On/Off], while keeping [Tare] pressed.
The display will show “A-On” or “A-OFF”.
Next press [Unit] to enter the units selection mode, the display will
show “On ct”.
Press [Tare] to select On or OFF.
On means this weighing unit is enabled,
OFF means this unit is disabled.
5) Press [Unit] to go to the next weighing unit. The following weighing
units can be selected in sequence.
ct – oz – dwt – tL.H – tL.S – tL.T (Note: g is always activated)
Turn the balance off and back to on again to return to normal operation.
NOTE: It is recommended that the balance is used in a location with suf-
ficient light so that the backlight function can be turned off to maximise the
battery life.
1)
2)
3)
4)

Page 12
Calibration
Calibration may be required when the balance is initially installed or if the bal-
ance is moved from a location.
With time and use, mechanical deviations may occur. Therefore calibrate
the balance whenever the best accuracy is required or when any deviation is
observed during weighing a test weight.
Before calibrating it is necessary to have the proper calibration weights. The
weights should be known to an accuracy that is appropriate for the balance
being calibrated, for example, OIML Class M1 type or ASTM E617 Class 4.
If you do not have proper weights do not attempt calibration.
AUTO CALIBRATION (FOR 150g ONLY)
Before entering calibration mode, press [On/Off] to turn the power on for 1
minute.
Enter calibration mode
Press [On/Off] to turn the power off.
Press [Unit] first and then press [On/Off], while keeping the [Unit]
key pressed. The display will show the A/D value.
Calibration
Wait for the stable indicator to be displayed,
Press [Unit] - the display will show “L 100” or “L150”, with the “L”
flashing.
Place the appropriate weight on the platform. A beep will be heard
after a few seconds and the display will show the weights value.
1)
2)
1)
2)
3)
Model # 150g 300g 500g 1200g 2000g 4000g
Calibration
Weight
100g
Or
150g
200g
Or
300g
200g
Or
500g
1000g
Or
1200g
1000g
Or
2000g
2000g
Or
4000g

Page 13
Press [On/Off], to turn off the power. Press [On/Off] to turn on the
power again.
Place maximum weight (150g) on the platform to verify weighing is
correct. If not, repeat the calibration.
AUTO CALIBRATION FOR ALL OTHER MODELS
Before entering calibration mode, press [On/Off] to turn the power on for 1
minute.
Enter calibration mode
Press [On/Off] to turn the power off.
Press [Unit] first and then press [On/Off], while keeping the [Unit] key
pressed. The display will show the last calibration value used, press
the [TARE] key to choose between the two calibration weight values
when you have made your selection press the [UNIT] key and the
display will show the A/D value.
Calibration
Wait for the stable indicator to be displayed,
Press [Unit] -the display will show “00SAVE”. After 2 seconds, the
display will return to A/D value.
Place the required weight on the platform.
After the stable indicator is displayed press [Unit]
The display will show “00SAVE”. The calibration in complete now.
Press [On/Off] to turn the power off. Press [On/Off] to turn on the
power again,
Place full weight (eg.500g for 500g model) on the platform to verify
weighing is correct. If not, repeat the calibration procedure.
4)
5)
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2)
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2)
3)
4)
5)
6)
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Page 14
Technical Support
EEEEHI Overload
EEEELO A/D value too low
Low battery
ERROR CODES
WARRANTY
Limited Warranty (Parts and Labour) for the components failed due to de-
fects in materials or workmanship. Warranty starts from the date of delivery.
During the warranty period, should any repairs be necessary, the purchaser
must inform its supplier. The manufacturer or its authorised Technician re-
serves the right to repair or replace the components and any freight involved
in sending the faulty units or parts to the service centre should be borne by
the purchaser.
The warranty will cease to operate if the equipment is not returned in the
original packaging and with correct documentation for a claim to be pro-
cessed. All claims are at the sole discretion of the manufacturer.
This warranty does not cover equipment where defects or poor performance
is due to misuse, accidental damage, exposure to radioactive or corrosive
materials, negligence, faulty installation, unauthorized modifications or at-
tempted repair or failure to observe the requirements and recommendations
as given in this Operator’s Manual.
Repairs carried out under the warranty does not extend the warranty period.
Components removed during the warranty repairs become the property of
the supplier.
The statutory right of the purchaser is not affected by this warranty.

Page 15
Manufacturer’s Declaration of Conformity
This product has been manufactured in accordance with the harmonised
European standards, following the provisions of the below stated direc-
tives:
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 interfer-
ence 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.