A&D EJ-123 User manual

1WMPD4002746B

This Manual and Marks
All safety messages are identified by the following, “WARNING” or “CAUTION”, of ANSI
Z535.4 (American National Standard Institute: Product Safety Signs and Labels). The
meanings are as follows:
WARNING A potentially hazardous situation, which if not avoided, could result
in death or serious injury.
CAUTION A potentially hazardous situation, which if not avoided, may result
in minor or moderate injury.
This is a hazard alert mark.
Note This manual is subject to change without notice at any time to improve the product. No
part of this manual may be photocopied, reproduced, or translated into another language
without the prior written consent of theA&D Company.
Product specifications are subject to change without any obligation on the part of the
manufacturer.
Compliance with FCC rules
Please note that this equipment generates, uses and can radiate radio frequency energy.
This equipment has been tested and has been found to comply with the limits of a Class
A computing device pursuant to Subpart J of Part 15 of FCC rules. These rules are
designed to provide reasonable protection against interference when the equipment is
operated in a commercial environment. If this unit is operated in a residential area it may
cause some interference and under these circumstances the user would be required to
take, at his own expense, whatever measures are necessary to eliminate the
interference.
(FCC = Federal Communications Commission in the U.S.A.)
Copyright 2015
Microsoft, Excel and Word are trademarks of Microsoft Corporation.

1
CONTENTS
1. INTRODUCTION....................................................................................................................3
2. UNPACKING...........................................................................................................................3
3. PART NAMESAND FUNCTIONS .........................................................................................4
4. SETTING UP..........................................................................................................................6
4.1. Setting Up Your Balance...............................................................................................6
4.2. Power Source...............................................................................................................7
4.3. Breeze Break................................................................................................................8
5. OPERATION...........................................................................................................................9
5.1. Turn The Power ONAnd OFF......................................................................................9
5.2. LCD Backlight...............................................................................................................9
5.3. Units............................................................................................................................10
5.4. SelectingAWeighing Unit...........................................................................................10
5.5. Basic Operation ..........................................................................................................11
5.6. Display Hold Mode......................................................................................................11
5.7. Counting Mode (pcs)..................................................................................................12
5.8. Percent Mode (%).......................................................................................................13
6. ACCUMULATION FUNCTION.............................................................................................14
7. CALIBRATION......................................................................................................................16
7.1. Calibration UsingAWeight.........................................................................................16
7.2. GravityAcceleration Correction..................................................................................17
8. FUNCTIONS.........................................................................................................................18
8.1. Key Operation.............................................................................................................18
8.2. Entering The Function Setting Mode..........................................................................18
8.3. Setting Example..........................................................................................................19
8.4. Storing Weighing Units ...............................................................................................20
8.5. Function List................................................................................................................21
9. OPTIONS..............................................................................................................................23
9.1. EJ-02 USB Interface...................................................................................................23
9.2. EJ-03 RS-232C Serial Interface.................................................................................24
9.3. Data Format................................................................................................................25
9.4. EJ-13 Density Determination Kit ................................................................................27
10. ID NUMBERAND GLP.........................................................................................................30
10.1. Setting The ID Number............................................................................................30
10.2. GLP Report..............................................................................................................31
11. MAINTENANCE ...................................................................................................................35
11.1. Notes On Maintenance ...........................................................................................35
11.2. Error Codes.............................................................................................................35

2
12. SPECIFICATIONS................................................................................................................37
12.1. Generals..................................................................................................................37
12.2. Weighing Units.........................................................................................................37
12.3. Options ....................................................................................................................38
12.4. Dimensions..............................................................................................................38
13. GRAVITYACCELERATION MAP........................................................................................39

3
Protective film
1. INTRODUCTION
This manual describes how this balance works and how to get the most out of it in
terms of performance.
The EJ-123 and EJ-303 compact precision balance has the following features:
The balance is high-resolution type electronic balance having a display resolution of
1/120,000 to 1/300,000.
The balance has a counting function, a percent function, a hold function and a total
function.
The LCD backlight will help with use in a dimly lighted place.
The balance can be operated with an AC adapter, or 4 x “AA” size dry-cell batteries
for cordless operation.
The optional RS-232C serial interface can be connected with a printer or personal
computer, and Good Laboratory Practice (GLP) data can be obtained.
The optional USB interface is available for connection to a personal computer.
2. UNPACKING
When unpacking the product, check whether all of the following items are included and
remove the protective film before use:
Main unit
EJ-123 / EJ-303 AC adapter
Weighing pan
Please confirm that the AC adapter
type is correct for your local voltage
and receptacle type
Instruction Manual
Wind shield cap

4
3. PART NAMES AND FUNCTIONS
Total indicator Measurement in air
for specific gravity
M+ indicator
Measurement in water
ACAI indicator for specific gravity
Battery indicator Density (Specific gravity)
Hold indicator
STABLE indicator
NET indicator
ZERO indicator
Breeze break
Weighing pan
Spirit level
ON:OFF key
LCD SAMPLE key
PRINT key
Calibration switch cover (bottom) RE-ZERO key
Leveling foot UNITS key
EJ-02/EJ-03 slot
Battery cover
Security slot AC adapter jack
(Use a security cable
commercially available.)
STABLE
NET
ZERO Weighing units
Wind shield cap
(A
ccessor
y
)

5
Turns the power ON or OFF.
Switches the weighing units and modes.
Clears the display to zero (combined zero and tare).
Held down to enter the function setting mode.
pcs mode: Enters the sample unit weight storing mode.
% mode: Enters the 100% weight storing mode.
Total mode: Adds the weight value to total.
Outputs the weight value to a printer, or computer.
Enters a unit weight, 100% weight or other setting values to the balance.

6
4. SETTING UP
4.1. Setting Up Your Balance
1. Place the weighing pan on the main unit.
2. Adjust the level of the balance using the leveling feet. Use the spirit level to confirm.
The bubble should be in the center of the circle.
3. Calibrate your balance before use. (Refer to “7. CALIBRATION”)
About the wind shield cap
Should the displayed weight value be unstable due to a draft, attach the accessory
wind shield cap to the hole located on the top of the breeze break.
It is possible to reduce the entry of a draft into the breeze break to some extent.
If attached, it may take time for the STABLE indicator to be displayed due to a variance
in air pressure as a result of the closure of the breeze break.
Wind shield cap (accessory)
Balance location
To measure correctly, to keep the balance in good condition, and to prevent hazards,
observe the following:
Do not install the balance in locations that are subject to excessive dust, breezes, vibration,
large temperature fluctuations, condensation, or that may have magnetic fields.
Do not install the balance on a surface that is soft or that may cause the balance level
to shift.
Do not install the balance in direct sunshine.
Do not install the balance near heaters or air conditioners.
Do not use an unstable AC power source.
Do not install the balance in a place where combustible or corrosive gases may exist.
Allow the balance to reach equilibrium with the ambient temperature before use.
To ensure accurate weighing, switch the power ON at least half an hour before use, or
have the AC adapter connected to the balance.
When the balance is installed for the first time, or the balance has been moved, carry
out calibration as described in “7. CALIBRATION”.

7
4.2. Power Source
For the power source, the AC adapter or 4 x “AA”
size dry-cell batteries can be used.
When Using The AC Adapter
Use a stable power source. To use the AC adapter,
insert the AC adapter plug into the AC adapter jack
on the rear side of the balance.
The balance is always connected to power internally (warming up status) while the AC
adapter is connected to the balance even when nothing is shown on the display.
When Using The Dry-Cell Batteries
Prepare 4 x AA size (LR6 / R6P) dry cell batteries. The batteries are not included with
the product.
CAUTION
Take great care with the polarity of the batteries. The polarity marks are shown in the
battery box.
Replace used batteries with four new ones when “lb0” is displayed.
Do not mix used and new batteries. Do not mix battery types. It may cause damage to
the batteries or the balance.
The battery life depends on the ambient temperature, how used and so on.
Remove batteries when the balance is not to be used for a long time.
They may leak and cause damage to the balance.
Damage due to battery leakage is not covered by the warranty.
Installing Batteries
1. Turn off the balance and disconnect the AC adapter if used.
2. Slide the battery cover off.
3. Push the battery box up to unhook and pull it out.
4. Insert new four batteries (LR6 / R6P / AAsize) into the battery
box, taking extreme care of the polarities.
5. Push the battery box into the balance as before.
6. Attach the battery cover.
The battery indicator turns on when the balance
is powered by the batteries. It will change as the
battery voltage decreases.
New Coming close to “lb0”.
AC adapter jack
Battery cove
r
4 x batteries
Battery box
Hoo
k
Hoo
k

8
4.3. Breeze Break
The breeze break can prevent a measurement error due to a (disturbing) wind.
Wipe it with a dry lint free cloth or a lint free cloth which is moistened with warm water.
To keep the antistatic treatment, do not use alcohols and solvents to clean the balance.
When an antistatic treatment becomes weak, apply an antistatic agent to the clear
plastic parts.
The clear cover can be disconnected from the fixing frame easily when adding an
excessive stress during operation. Assemble the breeze break with the following steps.
Assembling the breeze break
1. Slide back the fixing frame to
attach the breeze break.
(Or install the fixing frame into the
guide on the balance.)
2. Attach the axis of the breeze
break on the groove of the fixing
frame when keeping the angle of
90 degrees.
3. Slide and fix the breeze break.
4. Close the breeze break.
Pivot axis
Fixin
g
frame
Breeze break
Step 1
Step 3
Step 2
90°
Step 4
Breeze break
Hook
Hook
Groove
Guide
Guide

9
5. OPERATION
5.1. Turn The Power ON And OFF
1. Press the ON:OFF key to turn the power ON.
All of the symbols are displayed as shown above.
(About units: Only the available units will be displayed.)
When the scale is operating using dry-cell batteries, the scale performs count a
down using the under-bar on the display.
The display turns off except for a weighing unit and the decimal point.
The balance waits for the weight value to become stable, and then, zero will be
displayed with the ZERO indicator (power-on zero).
The range for power-on zero is within ±50% of the weighing capacity around the
calibrated zero point.
If the power is switched ON while there is a load beyond this range, the balance will be
tared to zero and the NET indicator and the ZERO indicator turn on.
2. Press the ON:OFF key again, and the power will be switched OFF.
Auto-power off function
It is possible to have the power automatically switched OFF, if the zero band
display (band width: ±4 digit from the zero point) continues for approximately 5
minutes. Refer to “8.5. Function List” and set the function to “ poff ”.
5.2. LCD Backlight
The LCD backlight will turn on when the weight value changes more than 4d (4 x min.
display division) or any key operation is done. When the weight value becomes and
stays stable for some moments, the backlight will automatically turn off. There is also a
setting that the backlight is always on or off. For details, see the function setting “ltUp”
of “8.5. Function list”.
STABL
E
NE
T
ZER
O
Weighing units

10
5.3. Units
The most common unit of weight used around the world is the gram, but there is often
a need to shift to alternative units specific to the country where the balance is used or
to select modes such as counting or percent.
The units and the order they appear in the display are as follows:
Among the units, those available for the user have been set at the factory before
shipping. The unit can be selected in the function setting mode. The order of the units
available is the same as above.
Note
It is possible to store only the units that will be actually used from the units
available. It is also possible to specify the unit that will be shown first when the
power is switched ON. For details, see “ 8.4. Storing weighing units ”.
Conversion table
Units Name Conversion to gram
oz Ounce (avoir) 28.349523125 g
ozt Troy ounce 31.1034768 g
ct Metric carat 0.2 g
dwt Pennyweight 1.55517384 g
GN Grain (UK) 0.06479891 g
N Newton (value in Newton) x 1000 / (9.80665 m/s2) g
“Newton” is the value calculated by “(weight in grams) x (9.80665 m/s2) / 1000”.
5.4. Selecting A Weighing Unit
Press the UNITS key to select a unit.
The following sections are a description of
the three common units: g (gram mode), pcs
(counting mode), and % (percent mode).
Density (specific gravity)
Gram
Counting mode
Percent mode
Ounce (avoir)
Metric carat
Pennyweight
Grain
Newton
Troy ounce
0.000
ZERO
Each pressing switches the units
available in the order described
on the previous page.
STABLE indicato
r

11
5.5. Basic Operation
1. Select a weighing unit.
2. When the display does not show zero, press
the RE-ZERO key to set the display to zero.
3. When using a tare (container), place the container
on the weighing pan, and press the RE-ZERO
key to subtract the tare weight.
4. Place the object to be weighed on the pan or in
the container.
Wait for the STABLE indicator to be displayed
and read the value.
When using the display hold mode, the hold
indicator HOLD is displayed.
5. Remove the object from the pan.
The RE-ZERO key will zero the balance if
the weight is within ±2% of the weighing
capacity around the power-on zero point.
The ZERO indicator turns on. When the
weight exceeds +2% of the weighing
capacity, it will be subtracted from zero as a
tare weight. In this case the ZERO and NET
indicators turn on.
Precautions during operation
Make sure that the STABLE indicator is on whenever reading or storing a value.
Do not press the keys with a sharp object such as a pencil.
Do not apply a shock or a load to the pan that is beyond the weighing capacity.
Keep the balance free from foreign objects such as dust or liquid.
Calibrate the balance periodically to maintain weighing accuracy.
(Refer to “7. CALIBRATION”.)
5.6. Display Hold Mode
In stable measurement, this function can pause the weight value to read it easily. The
function pauses the value except zero band. (band width : ±4 digit from the zero point)
The function releases the value when the weight value changes above the preset value.
Also, when the RE-ZERO key is pressed, the display hold is canceled and display
becomes zero. Refer to the item "Hold" of "8.5. Function List".
Containe
r
Weighing pan
0.000
NET
ZERO
060.003
NET
STABLE indicato
r
Object to be
weighed

12
5.7. Counting Mode (pcs)
The balance weighs the sample pieces and calculates the unit weight.
Using the sample unit weight, the scale counts the number of items in the sample.
As for the minimum unit weight acceptable, see the function setting “Umin”.
Selecting The Counting Mode
1. Press the UNITS key to select . ( :pieces)
Storing The Sample Unit
2. Press the SAMPLE key to enter the sample unit
weight storing mode.
3. To select the number of samples, press the
1SAMPLE key. It may be set to 5, 10, 25, 50, or 100.
4. Place a tare container on the weighing pan, and
press the RE-ZERO key. Confirm that the
right side of the number of samples shows zero.
5. Place the number of samples specified on the pan.
In this example, 25 pieces.
6. Press the PRINT key to calculate and store the
unit weight. Remove the sample. The balance is set
to count objects with this unit weight.
When a unit weight is too light to store, the display
shows lo for the moment and returns to the
former display. When sample weight is light and the
counting error could become large, the balance will
request you to use a larger number of samples.
Place the displayed number of samples on the pan
and press the PRINT key to calculate and store
the unit weight. See also "Sample quantity notice"
and "Unit weight error" of "11.2.Error codes".
Counting The Objects
7. Place the objects to be counted on the pan.
Counting Mode Using The ACAI Function
ACAITM (Automatic Counting Accuracy Improvement)
is a function that improves the accuracy of the unit
weight by increasing the number of samples as the
counting process proceeds.
8. After fixing the unit weight at step 6, add a few
more samples on the pan. Then, the ACAI indicator
turn on. (Add more than three pieces. But the
indicator will not turn on for the number of samples
beyond the ACAI range.)
9. The ACAI indicator will blink and the balance re-calculates the unit weight. Do not
touch the balance or samples on the pan until theACAI indicator turns off.
Weighing pan
0
10 -
25 -
Containe
r
25
A
CAI indicato
r
ACAI
25
Confirm the display
25 0
ZERO
Switches the number of samples
Samples
(25 pcs)
To store

13
10. Counting accuracy is improved when the ACAI indicator turns off. Each time the above
operation is performed, a more accurate unit weight will be obtained. There is no
definite upper limit of ACAI range for the number of samples exceeding 100. Try to add
a similar number of samples as that displayed.
5.8. Percent Mode (%)
Displays the weight value in percentage compared to a reference (100%) weight.
Selecting The Percent Mode
1. Press the UNITS key to select %. (%:percent)
Storing The Reference (100%) Weight
2. Press the SAMPLE key to enter the reference
weight storing mode.
3. Press the RE-ZERO key to display 100 0%.
4. Place the sample to be set as the reference weight
on the pan.
5. Press the PRINT key to store the reference
weight. Remove the sample.
When a unit weight is too light to store, the display
shows for the moment and returns to the
former display.
Reading The Percentage
6. Place the object to be compared to the reference
weight on the pan. The displayed percentage is
based on 100% of the reference weight.
To store
0.0 %
100 - %
100.0 %
75.8 %
100 0 %
ZERO
Weighing pan
Sample corresponding
to the 100% weight
Object to be compared

14
6. ACCUMULATION FUNCTION
This function counts the number of times articles are weighed, calculates the total mass
value and can display the number (accumulation count) and accumulated mass value.
Preset the item "Hold" of the function list to use the accumulation function.
The accumulation count and accumulated mass value are stored in the scale even if
the power is removed.
Indicators And Keys
The indicator is displayed when storing the accumulation data.
The indicator and is displayed when displaying the accumulated count and
accumulated mass.
Operation keys as follows :
The UNITS key
When storing the accumulation data and pressing the UNITS key, the current
weight value, the accumulated count and accumulated mass value are displayed
sequentially.
When the accumulation data is not stored, the UNITS key switches the preset
units sequentially.
The RE-ZERO key
When displaying the weight value and pressing the RE-ZERO key,
zero is displayed.
While displaying the accumulated count and accumulated mass, when pressing
the RE-ZERO key, the accumulation data is reset to the zero.
The SAMPLE key
The condition of the accumulation function is as follows :
When a stable weight value is above ±5 digits from zero band.
The accumulated count is less than 1000.
The accumulated mass value is less than 9999999.
The unit weight of the counting mode and the reference (100%) weight of the percent
mode can not store when using the accumulation function.

15
Operations
Selecting A Weighing Unit
1. Select a unit to be used in the accumulation
function with pressing the UNITS key.
The unit can not change after storing the
accumulation data. If changing the unit, reset
the current accumulation data, change the unit.
Plural units can not use at the same time.
Adding Accumulation Data
2. Press the RE-ZERO key to display zero of
the weighing measurement.
3. Place the sample on the pan.
4. When displaying stable weight value, press the
SAMPLE key to accumulate it. The
indicator is displayed.
5. Repeat step 2, 3, 4 to weigh
other samples.
The indicator blinks at
once for each sample.
Displaying Accumulation Data
6. When pressing the UNITS key,
the current weight value, the
accumulated count and
accumulated mass value are
displayed sequentially. The
indicator and is displayed
when displaying the accumulated
count and accumulated mass.
Deleting Accumulation Data
1. Display accumulated count or accumulated mass value.
2. Press the RE-ZERO key to reset the accumulated count and accumulated mass to zero.
The indicator and are turned off and the state of the balance proceeds to
step 1 on this page.
When the Unit of the function list is changed, the accumulation data are reset.
0.000 g
ZERO
Sample
Weighing pan
0.000 g
ZERO
Unit
60.003 g
060.003 g
M+
When accumulating data,
the indicator is displayed.
3
M+
180.009 g
M+
Weight value
(and unit)
Accumulated count
(and )
Accumulated mass
(, and unit)

16
7. CALIBRATION
This function adjusts the balance for accurate weighing.
Perform calibration in the following cases.
When the balance is first used.
When the balance has been moved.
For regular calibration.
7.1. Calibration Using A Weight
Prepare a calibration weight (sold separately) in advance.
1. Warm up the balance for at least half an hour with
nothing on the pan.
2. Press and hold the calibration (CAL) switch until
Cal appears, and release the switch.
3. The balance displays Cal 0 .
To change the calibration weight value, proceed to step 4.
To use the calibration weight value in the balance
memory, proceed to step 5.
4. Press the SAMPLE key. The display shows the
calibration weight value in “grams” that is stored in the
balance. Use the following keys to change the value.
SAMPLE key......To select the digit blinking to be changed.
RE-ZERO key....To set the value of the digit selected.
PRINT key...........To store the value and return to step 3.
UNITS key...........To cancel the value and return to step 3.
Use a calibration weight more than 2/3 of the capacity.
5. At step 3, press the PRINT key to weigh the
zero-point value. Do not touch the pan during weighing.
When the zero calibration is completed, the display will
show the calibration weight value.
To perform the zero calibration only and finish the
procedure, press the UNITS key. After displaying
end , the balance turns off.
6. Place a calibration weight with the same value as displayed
on the pan.
Press the PRINT key to weigh it. Do not touch the pan
during weighing.
Calibration (CAL) switch
Calibration (CAL) switch cover
Cal
Cal 0
0100.000
Cal 0
Set the weight using
the relevant keys
Release the CAL switch
Press and hold
the CAL switch
With nothing
on the pan
To store
Calibration
weight
Cal 0
100.000

17
7. end is displayed.
Remove the weight from the pan.
When the GLP output (function setting “info 1” or
“info 2”) is selected, glp is displayed. The
calibration report is output and end is
displayed again. Then the balance will be turned off.
Note
The value set in step 4 is stored in memory even
after the power is switched OFF.
If the balance is to be moved to other places, set
the gravity acceleration value of the area where
the calibration using a weight is to be done, and
calibrate the balance according to the procedure
above. See the next section to set the value.
7.2. Gravity Acceleration Correction
When the balance is first used or has been moved to a different place, it should be
calibrated using a calibration weight. But if a calibration weight is not available, the
gravity acceleration correction will compensate the balance. Change the gravity
acceleration value of the balance to the value of the area where the balance will be
used. See the gravity acceleration map appended to the end of this manual.
Note
Gravity acceleration correction is not required when
the balance is calibrated using a calibration weight
at the place where the balance is to be used.
1. Press and hold the calibration (CAL) switch until
Cal appears, and release the switch.
2. The balance displays Cal 0 .
3. Press the RE-ZERO key. The display shows the
gravity acceleration value stored in the balance. Use the
following keys to change the value.
SAMPLE key......To select the digit blinking to be changed.
RE-ZERO key....To set the value of the digit selected.
PRINT key...........To store the value and return to step 2.
UNITS key...........To cancel the value and return to step 2.
4. After setting the value, press the PRINT key.
end and Cal 0 is displayed again.
5. If it is necessary to calibrate the balance using a calibration
weight, go to step 4 of "7.1. Calibration Using A Weight".
To finish the setting, press the UNITS key.
6. The balance is turned off.
Cal
Cal 0
9.7985
Cal 0
The balance is turned off.
Release the CAL switch
Set the value using the
relevant keys
Press and hold
the CAL switch
end
To store
100.000
0end000
To store
The balance is turned off.
glp
GLP output
end000

18
8. FUNCTIONS
8.1. Key Operation
The ON:OFF key to cancel the operation and turns
the balance off.
Item key to select a class and an item.
In the weighing mode, press and hold the key to enter
the function setting mode.
The enter key to proceed to the selected class and
store the setting per class and goes to the next class.
The parameter key to select a parameter.
The cancel key to cancel the operation, and proceed to
the next class or return to the weighing mode.
8.2. Entering The Function Setting Mode
In the weighing mode, press and hold the SAMPLE key
to enter the function setting mode and display func .
Each time the SAMPLE
key is pressed, the class appears one after another.
Once a class is selected, the items are
available for selection. (Refer to “8.5. Function List”.)
func
Unit
Press and hold
Each pressing switches the class
Set using the
relevant keys
•
•
•