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