EK-L Series
Precision Bench Scale
EK-15KL/EK-30KL

INSTRUCTION MANUAL

1WMPD4002971

© 2014 A&D Company, Limited. All rights reserved.
No part of this publication may be reproduced, transmitted, transcribed, or translated into any
language in any form by any means without the written permission of A&D Company, Limited.

The contents of this manual and the specifications of the instrument covered by this manual are
subject to change for improvement without notice.

COMPLIANCE WITH FCC RULES
Please note that this equipment generates, uses and can radiate radio frequency energy. Thisequipment has been tested and has been found to comply with the limits of 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 underthese 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.)

Note
Under some ambient electromagnetic conditions, this equipment may be affected by theelectromagnetic interference.

This is a hazard alert mark.

CONTENTS
1. INTRODUCTION .............................................................................................................3
2. UNPACKING ...................................................................................................................3
3. PART NAMES AND FUNCTIONS ...................................................................................4
4. SETTING UP ...................................................................................................................6
4-1. Setting up your scale .................................................................................................6
4-2. Power source.............................................................................................................7
5. OPERATION....................................................................................................................95-1. Turning the power ON and OFF ................................................................................95-2. Weighing units .........................................................................................................10
5-3. Selecting a weighing unit .........................................................................................10
5-4. Basic operation........................................................................................................ 11
5-5. Weighing range .......................................................................................................125-6. Counting mode (pcs) ...............................................................................................13
5-7. Percent mode (%)....................................................................................................15
6. COMPARATOR .............................................................................................................16
6-1. Setting example.......................................................................................................16
7. CALIBRATION ..............................................................................................................18
7-1. Preparation ..............................................................................................................18
7-2. Zero calibration........................................................................................................19
7-3. Calibration using a calibration weight ......................................................................19
7-4. Gravity acceleration correction ................................................................................20
8. FUNCTIONS..................................................................................................................218-1. Key operation ..........................................................................................................21
8-2. Entering the function setting mode ..........................................................................21
8-3. Setting example.......................................................................................................228-4. Storing weighing units..............................................................................................23
8-5. Function list .............................................................................................................24
9. RS-232C SERIAL INTERFACE.....................................................................................26
9-1. Interface specifications ............................................................................................26
9-2. Data format..............................................................................................................28
9-3. Data output mode ....................................................................................................29
9-4. Command mode ......................................................................................................29

1

10. ID NUMBER AND 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
12. SPECIFICATIONS .......................................................................................................37
12-1. Specifications.........................................................................................................37
12-2. Other weighing units ..............................................................................................37
12-3. Option....................................................................................................................37
12-4. External dimensions ..............................................................................................38
GRAVITY ACCELERATION MAP .....................................................................................392

1. INTRODUCTION
This manual describes how the EK-L series scale works and how to get the mostout of it in terms of performance.
The EK-L series scales have the following features: The EK-15KL is a high resolution electronic scale having a resolution of 1/150,000.
 The EK-30KL is a dual range scale and each range has a resolution of 1/30,000.
 The EK-L series scales have a counting function, % function and comparator
function.
 The backlight LCD provides ease of use even in dark locations.
 RS-232C serial interface is equipped as standard for connection to a printer or
personal computer.
 Using the serial interface, Good Laboratory Practice (GLP) data can be output.
 The optional sealed lead-acid battery enables use in locations where AC power is
not available.

2. UNPACKING
Unpack the package and check that all of the following items are included:

Main unit

AC adapter

Instruction manual
EK-L Series
Precision Bench Scale
EK-15KL/EK-30KL

Please confirm that the AC adapter
is correct for your local voltage andreceptacle type.

3

3. PART NAMES AND FUNCTIONS

Weighing pan

Battery cover

Security slot

Display

Bubble spirit levelA security cable is not provided andmust be prepared by the user.

Leveling footCalibration switch cover
The CAL switch is inside.

Grounding terminal

Leveling footAC adapter jack

RS232C terminal

4

Weighing range
indicators

Comparator results

ACAI indicator Battery indicator

STABLE indicator
HOLD indicator
NET indicatorZERO indicator
Weighing units

Indicator
STABLE indicator
HOLD indicator
NET indicatorZERO indicator
Weighing range
indicators
Comparator results
ACAI indicator
Weighing units
Battery indicator

Description
Turns on when the weight value is stable and is ready to be read.
Turns on while the display lock is being performed.
Does not turn on when the display lock function is disabled.
Turns on when the net weight is displayed.
(The tare operation is in progress.)
Turns on when zero is displayed.
Indicates a weighing range.
Turns on when the automatic range function is selected for the EK-30KL.
Indicates the results of comparison by turning on HI , OK or LO .
Does not turn on when the comparator function is disabled.
Turns on or blinks when the ACAI function is being performed.
Does not turn on when the ACAI function is disabled.
The weighing units stored in memory turn on.
Changes as the battery capacity decreases as follows:
Full→→
Recharging required
Does not turn on when the AC adapter is used.

Key

Description
1ON/OFF key
Turns the power ON or OFF.
When turned ON, the scale is automatically set to zero. (power-on zero).
1MODE key
Switches the weighing units.
1PRINT key
Outputs the weight data to a printer or personal computer.
1RE-ZERO key
Sets the display to zero.

CAL switch

Located under the calibration switch cover.
Press and hold the switch to enter the calibration mode.
5

4. SETTING UP
4-1. Setting up your scale
1. Adjust the level of the scale using the levelingfeet. Use the bubble spirit level to confirm.
The bubble should be in the center of the circle.
2. Calibrate the scale before use.
See “7. CALIBRATION.”

Bubble spirit level

Scale location
Observe the following to get the most out of your scale and weigh correctly.












Do not install the scale in locations that are subject to dust, draft, vibration,
excessive temperature changes, condensation, or that may have magnetic
fields.
Install the scale on a solid and level surface.
Do not install the scale in direct sunlight.
Do not install the scale near heaters or air conditioners.
Use a stable AC power source.
Do not install the scale in a place where flammable or corrosive gases present.
Allow the scale to reach equilibrium with the ambient temperature before
use.
Turn the power ON and warm up the scale for at least 30 minutes before use.
When the scale is installed for the first time, or the scale has been moved,
perform calibration as described in “7. CALIBRATION.”
If it seems that the scale is being affected by static electricity, ground thescale using the grounding terminal to reduce effects of static electricity.
Grounding terminal

6

4-2. Power source
As the power source, the AC adapter or lead-acid battery is available.
The scale remains powered while the AC adapter is connected, even if nothing isshown in the display.
To ensure stable weighing, keep the scale connected to the power supply using
the AC adapter whenever possible.
There are no negative effects to the scale in keeping it connected to the power
supply.
To ensure accurate weighing, connect the scale to the power supply at least 30
minutes before use.

Using the AC adapter
Connect the AC adapter to an electricaloutlet.
Insert the AC adapter plug into the AC
adapter jack located on the underside ofthe display.
AC adapter jack

 Use a stable power source.
 Use the AC adapter provided
with the scale.
AC adapter

Using the sealed lead-acid battery
A commercially available sealed lead-acid battery can be used to operate the scale.
 Use an NP4-6 battery (6V, 4.0Ah) manufactured by Yuasa Battery Inc.
 The scale can be operated continually for approximately 100 hours ona fully charged battery (at 25°C with backlight always off) When disposing of the battery, inquire to the battery manufacturer,
supplier or industrial waste disposal company for details on how tocorrectly dispose of the battery.
 The overall operating hours and battery life vary depending on how
the scale is used and the ambient temperature.
Sealed lead-acidbattery

Battery coverM3 screws“–“ terminal(black)7“+” terminal(red)1. Remove the AC adapter plug from the AC adapter jack.
2. Loosen the M3 screws that secure the battery cover and remove the battery cover.
3. Connect the cables in the battery compartment to the battery,the red cable to the + terminal and the black cable to the - terminal.
 Connecting the battery incorrectly may cause the battery to leak or
burst, or may cause fire.
4. Install the battery into the battery compartment. Replace the battery cover andsecure it using the M3 screws removed in Step 2.
5. Press the ON/OFF
operates properly.

key to turn the power ON and confirm that the scale The battery indicator is on when the battery is used to operate the scale.
 If “lb” appears in the display, the battery has depleted. Recharge thebattery immediately.

Recharging the lead-acid battery
1. Connect the cables in the battery compartment to the battery,the red cable to the + terminal and the black cable to the - terminal.
2. Connect the AC adapter to an electrical outlet. Insert the AC adapter plug into the
AC adapter jack.
3. Recharging starts automatically.
 Recharge the battery periodically even if the scale is not used for along period of time. The battery needs to be recharged at least every
three to six months. The battery needs to be recharged more
frequently when used in warmer places.
The battery takes approximately 15 hours to fully recharge.
When recharging is complete, remove the AC adapter plug from theAC adapter jack and wait for several minutes before using thebattery to operate the scale.
 The scale can be used while the battery is being recharged. However,to ensure stable weighing, use the scale after the battery has been fullyrecharged.
 When using a new battery, fully charge the battery before use.
 Only use the AC adapter provided with the scale to recharge thebattery. Using other adapters may prevent the battery from recharging
correctly, and may also cause the battery to leak or bust, or may
cause fire.
 Recharge the battery in an environment where the temperature is
between 0°C and 40°C. The ideal temperature range is 5°C to 35°C.

8

5. OPERATION
5-1. Turning the power ON and OFF
1. Press the

ON/OFF

key to turn the power ON.

All the display symbols appear as shown above.
(As for weighing units: Only the units stored in memory are displayed.)
The display turns off except a weighing unit and a decimal point.
The scale waits for the weight value to become stable, and zero is displayed with
the ZERO indicator (power-on zero).
The range for power-on zero is within ±10% of the weighing capacity around thecalibrated zero point.
If the power is turned ON while there is a load beyond this range, the scale is tared
to zero and the NET and ZERO indicators turn on.
2. Press the

ON/OFF

key to turn the power OFF.

 Auto power-off function
The auto power-off function automatically turns the power OFF when zerois displayed for approximately 5 minutes.
See “poff” in “8-5. Function list.” Display lock function
The display lock function locks the display temporarily to make the weightvalue easier to read.
See “Hold” in “8-5. Function list.”LCD backlight function
The LCD backlight turns on when the weight value changes 4d or more (d= minimum display, so, corresponding to four times as great as theminimum display) or any key operation is performed. When the weightvalue is stable for a certain period of time, the backlight automaticallyturns off. The backlight can also be set to remain on or off.
See “ltUp” in “8-5. Function list.”9

5-2. Weighing 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 scale is used or to
select modes such as counting or percent.
The units and the order they appear in the display are as follows:

Percent mode
Counting mode
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, while skipping the units that are not available.
 It is possible to store the weighing units that will be actually used from theunits available. It is also possible to specify the unit that will appear firstwhen the power is ON.
For details, see “8-4. Storing weighing units.”
Conversion table
Units
kg
oz
lb
ozt
tl

Name
kilogram
Ounce (avoir)
Pound (UK)
Troy ounce
Tael (Hong Kong general, Singapore)

Conversion to gram1000 g28.349523125 g
453.59237 g
31.1034768 g
37.7994 g

 The unit “tl (tael)” is for special versions only.

5-3. Selecting a weighing unit
Press theMODE

key to select a weighing unit.
Switches the units
available in the order
described above

STABLE indicator105-4. Basic operation

Container

1. Select a weighing unit.
2. When the display doesn’t show zero, press the
RE-ZERO key to set the display to zero.
3. When using a tare (container), place thecontainer on the weighing pan, and press the
RE-ZERO key to set the display to zero.
4. Place the object to be weighed on the pan or in
the container.
Wait for the STABLE indicator (  ) to turn on
and read the value.
5. Remove the object from the pan.
 The RE-ZERO key will zero the scale if theweight value is within ±2% of the weighing
capacity around the power-on zero point. The
ZERO indicator turns on. When the weightvalue exceeds +2% of the weighing capacity,
the scale is tared to zero and the ZERO and
NET indicators turn on.

Weighing pan

Object to
be weighed

STABLE indicator

Precautions during operation
 Make sure that the STABLE indicator is on whenever reading or storing avalue.
 Do not use a sharp instrument such as a pencil to press the keys.
 Do not apply a shock or a load to the pan that is beyond the weighing
capacity.
 Keep the scale free from foreign objects such as dust or liquid.
 Calibrate the scale periodically to ensure accurate weighing.
See ”7. CALIBRATION.”

11

5-5. Weighing range
Function setting
rng 0

Description
Fixed range
 Fixed to 1/30,000. (R2 range for the EK-30KL)
Automatic range function (Only for the EK-30KL)
The EK-30KL has two weighing ranges when the automatic
range function is selected. The indicator R1 or R2 turns
on to indicate which range the weight value belongs to.

rng 1

 When the weight value exceeds the maximum value of
the R1 range, the weighing range changes automaticallyto the R2 range.
 When there is nothing on the weighing pan and zero isdisplayed with the ZERO indicator, the weighing range
will automatically be the R1 range.
 When the RE-ZERO key is pressed in the R2 range,
the scale is tared to zero and the weighing range changes
to the R1 range.

125-6. Counting mode (pcs)
The counting mode determines the number of objects in a sample, using the basic
sample unit mass.
Selecting the counting mode
1. Press the MODE key to select.
(: pieces)

Press and hold

Storing the sample unit mass
2. Press and hold the MODE key to enter the
sample unit mass storing mode.

3. Press the PRINT key to select the number ofsamples, 5, 10, 25, 50, or 100.

Switches the number ofsamplesContainer
4. When using a tare (container), place thecontainer on the weighing pan, and press the
RE-ZERO key. Confirm that the right side of
the number of samples shows zero.
Weighing
pan

Confirm the zero display

5. Place the number of samples specified in Step 3
on the pan. In this example, 25 pieces.

6. Press the MODE key to calculate and store
the unit mass. Remove the sample. The scale isset to count objects with this unit mass.

13

Samples(25 pieces)

To store When a unit mass is too light to store,loappears in the display for a momentand returns to the former display. When thesample mass is light and the counting error
could become large, the scale prompts you
to use a larger number of samples. Place thedisplayed number of samples on the pan
and press the MODE key to calculate andstore the unit mass.
See also “Sample quantity error” in “11-2.
Error codes.”Counting the objects
7. Place the objects to be counted on the pan.

Counting mode using the ACAI function(AutomaticCounting
Accuracy
ACAITM
Improvement) is a function that improves theaccuracy of the unit mass by increasing thenumber of samples as the counting processproceeds.
8. After setting the unit mass in Step 6, add a few
more samples on the pan. Then, the ACAI
indicator turns on.
Try to add the same number of samples as
displayed. The ACAI indicator does not turn on if
overloaded.
9. The ACAI indicator blinks and the scale recalculates the unit mass. Do not touch the scaleor samples on the pan until the ACAI indicatorturns off.
10. Counting accuracy is improved when the ACAI
indicator turns off.
Each time the above operation is performed, amore accurate unit mass will be obtained. Thereis no definite upper limit of ACAI range for thenumber of samples exceeding 100. Try to add
the same number of samples as displayed.

14

ACAI indicator5-7. Percent mode (%)
The percent mode displays the weight value in percentage compared with the 100%
reference mass.
Selecting the percent mode
1. Press the MODE key to select % . (%: percent)Press and hold
Storing the 100% reference mass
2. Press and hold the MODE key to enter the
100% reference mass storing mode.

3. Press the

RE-ZERO

key to display 100 0%.

Weighing
pan

4. Place the sample to be set as the 100%
reference mass on the pan.

Sample corresponding
to the 100% reference mass
5. Press the MODE key to store the 100%
reference mass. Remove the sample.
 When the 100% reference mass is too light,loappears in the display for a momentand returns to the former display.

Reading the percentage
6. Place the object to be compared with the 100%
reference mass on the pan. The displayedpercentage is based on the 100% reference
mass.

15

To store

Object to becompared6. COMPARATOR
The results of the comparison are indicated by HI , OK or LO
The comparison is as follows:LO  Lower limit value  OK  Upper limit value  HI

in the display.

Comparison mode (see “Cp” in “8-5. Function list”):
 No comparison (comparator function disabled).
 Compares all data.
 Compares all stable data.
 Compares plus data except those near zero.
 Compares stable plus data except those near zero.
 Compares all data except those near zero.
 Compares all stable data except those near zero.
“Near zero” is a range within ±4d from the zero point in grams or kilograms.
d = minimum display
The upper limit and lower limit numerical values are common to each of the weighing,counting and percent modes. An example is shown below.
Upper limit value “001010”: “101.0 g” “1010 pcs” “101.0%”
Lower limit value “000990”: “99.0 g” “990 pcs” “99.0%”

6-1. Setting example
To set “Compares plus data except those near zero.”
Selecting a comparison mode
1. With the power turned OFF, press and hold the
RE-ZERO key and press the ON/OFF key to turnthe power ON and enter the function setting mode.
func
appears.
(If the comparison mode is already set, press the
MODE key to go to “Entering the upper and lower limit
values.”)2. Press the

PRINT

3. Press the MODE
Cp
X.

key to display

Press several times

poff X .

key several times to display

Press several times
4. Press the RE-ZERO
Cp
3.

key several times to display

5. Press the PRINT key to store the settings.
Cp Hi
appears afterend .
To store
16

Entering the upper and lower limit values
6. With Cp Hi
displayed, press the PRINT key.
Enter the upper limit value using the following keys.
MODE

key

RE-ZEROkey

To select the digit to change thevalue. The selected digit blinks.
To change the value of theselected digit.

CAL switch

To switch the sign “+” and “-“.

PRINT

To store the value and proceed to
the next step.
Cp lo appears after end .

key

Set using therelevant keys

To store

7. With Cp lo
displayed, press the PRINT key.
Enter the lower limit value using the following keys.
MODE

key

RE-ZEROkey

To select the digit to change thevalue. The selected digit blinks.
To change the value of theselected digit.

CAL switch

To switch the sign “+” and “-“.

PRINT

To store the value and proceed to
the next step.
Unit
appears after end .

key

Set using therelevant keys

To store

8. Press the ON/OFF key to turn the power OFF orpress the RE-ZERO key to return to the weighingmode.
To return to theweighing mode17

7. CALIBRATIONThis function adjusts the scale for accurate weighing.
Perform calibration in the following cases.
 When the scale is first used.
 When the scale has been moved.
 When the ambient environment
has changed.
 For regular calibration.

Loosen the screws
to remove the cover
The CAL switch
is inside

7-1. Preparation
Prepare a calibration weight (conforming to OIML class F1)
before starting calibration.
A calibration weight is not required for performing zero
calibration only.
When a calibration weight is not available, the gravity
acceleration correction can be performed to compensate thescale.
1. Turn the power ON and warm up the scale for at least
30 minutes with nothing on the pan.
2. Press and hold the CAL switch until
appears, and release the switch.
3.

Cal 0

Cal

Press and holdthe CAL switch

appears.

To change the calibration weight value, proceed to
Step 4.

Release the CAL
switchTo use the calibration weight value stored in memory or
perform zero calibration only, proceed to Step 5.
4. Press the PRINT key. The display shows thecalibration weight value in “grams” that is stored inmemory. Use the following keys to change the value.
MODE

key

RE-ZERO
PRINT

key

key

To select the digit to change thevalue. The selected digit blinks.
To set the value of the selecteddigit.
To store the value and return toStep 3.

Use a calibration weight of more than 2/3 of theweighing capacity (of the R2 range for the EK-30KL).
The calibration weight value is stored in memory
even after the power is turned OFF.
18

Set using therelevant keys

7-2. Zero calibration
5. With nothing on the pan, press the RE-ZERO key
to calibrate the zero point. Do not touch the panduring zero calibration.
When the zero calibration is complete, the calibration
weight value appears in the display.
 To perform zero calibration only and finish theprocedure, press the ON/OFF key to turn the
power OFF or press the CAL switch.

7-3. Calibration using a calibration weightWith nothing on the pan

To store

Calibration
weight

6. Place the calibration weight with the same value as
displayed on the pan. Press the RE-ZERO key toperform calibration. Do not touch the pan duringcalibration.

To store7.

end
appears.
Remove the weight from the pan.
Press the ON/OFF key to turn the power OFF orpress the RE-ZERO key.

19

7-4. Gravity acceleration correction
When the scale is first used or has been moved to a different place, it should becalibrated using a calibration weight.
But if a calibration weight is not available, the gravity acceleration correction willcompensate the scale. Change the gravity acceleration value of the scale to the valueof the area where the scale will be used. See the gravity acceleration map appended
to the end of this manual.
 Gravity acceleration correction is not required when the scale is calibratedusing a calibration weight at the place where the scale will be used.

1. In the weighing mode, press and hold the CAL switch
until Cal
appears, and release the switch.

2.

Cal 0

Press and holdthe CAL switch

Release the CAL
switchappears.

3. Press the MODE key.
The display shows the gravity acceleration value
stored in memory.
Use the following keys to change the value.
MODE

key

RE-ZEROkey

To select the digit to change thevalue. The selected digit blinks.
To set the value of the selecteddigit.

4. After setting the value, press the
The value is stored and Cal 0

Set using therelevant keys

PRINT key.
appears again.
To store

5. If it is necessary to calibrate the scale using acalibration weight, go to Step 3 of “7-1. Preparation.”
To finish the setting, press the ON/OFF key to turnthe power OFF or press the CAL switch.

208. FUNCTIONS
8-1. Key operation
Key

Description
1ON/OFF key
Cancels the operation and turns the power OFF.
1MODE key
Selects a class and an item.
1PRINT key
Proceeds to the selected class.
Stores the settings per class and goes to the next class.
1RE-ZERO key
Selects a parameter.

8-2. Entering the function setting mode
With the power turned OFF, press and hold the
RE-ZERO key and press the ON/OFF key to turnthe power ON and enter the function setting mode.
func
appears.
Each time the MODE key is pressed, the classappears one after another.
See “8-5. Function list.”

Switches the class

・
・
・

21

8-3. Setting example
To set the auto power-off function to “Enabled” and the ACAI function to “Disabled.”
1. With the power turned OFF, press and hold the
RE-ZERO key and press the ON/OFF key to turnthe power ON and enter the function setting mode.
func
appears.

2. Press the

PRINT

key to display

3. Press the

RE-ZERO

poff 0 .

key to displaypoff 1 .
Switches the parameter

4. Press the MODE
aCai 1 .

5. Press the

key several times to display

RE-ZERO

key to display

Press several times

aCai 0 .

Switches the parameter

6. Press the PRINT key to store the parameters.
Cp Hi
appears afterend .

To store

7. Press the ON/OFF key to turn the power OFF orpress the RE-ZERO key.

22

8-4. Storing weighing units
It is possible to store the weighing units that will be actually used from the units
available. For the units available, see “5-2. Weighing units.”
Select and store the weighing units as described below:
1. With the power turned OFF, press and hold the
RE-ZERO key and press the ON/OFF key to turnthe power ON and enter the function setting mode.
func
appears.
Press several times
2. Press the MODE
Unit.

key several times to display

3. Press the

PRINT

key.

4. Press the

MODE

key to change a weighing unit.
Switches weighing units

5. Press the RE-ZERO key to select the weighing unit.
The STABLE indicator turns on when the weighing unit
has been selected.

6. Repeat Steps 4 and 5 to select all weighing units to be
used.

7. Press the PRINT key to store the units.
idappears afterend .

8. Press the ON/OFF key to turn the power OFF orpress the RE-ZERO key.
 When the scale is turned ON, it starts with theweighing unit that was selected first in Step 5.
23

To select

STABLE indicator

To store

8-5. Function listClassfunc poff

Item

Auto power-off functionrng
Weighing range

Hold

 0
1
0
 1
0

Display lock function

 1

2

3

4
trc
Zero tracking

pnt
Decimal point type

Cp
Comparison mode

0
 1
 0
1
 0
1
2
3
4
5
6

prt
Data output modebps
Baud rate

btpr
Data bits and parity

Description

Parameter

Turns the power
Disabled
OFF automaticallyEnabledSwitches the range
Fixed to 1/30,000
Automatic range function (EK-30KL only)
Locks the display
Disabled
temporarily
Enabledd=minimum display
Disables the function when thechange in weight values exceeds±10dEnabledDisables the function when thechange in weight values exceeds±50dEnabledDisables the function when thechange in weight values exceeds±100dEnabledDisables the function when thechange in weight values exceeds±200d
Tracks the zero
Disabled
shift
Enabled
Selects a decimalDot (.)
point typeComma (,)
Conditions to
No comparison(Comparator function disabled) compare.
Compares all data
“Near zero”
Compares all stable data
=range within ±4dCompares plus data except
from the zero point inthose near zerograms or kilograms
Compares stable plus data
except those near zero.
d=minimum display
Compares all data except thosenear zeroCompares all stable data
except those near zeroCommand mode/stream mode Auto-print A:+ dataCommand mode/key mode0
 1Command/key modes, auto-print A
2
Command/ key modes, auto-print B
3
Command mode only4
 02400 bps
4800 bps
1
9600 bps
21200 bps3
 0
7 bits, even parity
7 bits, odd parity
1
8 bits, non parity2
 Factory setting
24

Auto-print B:+/- data

Selects a baud rate

Selects data bits
and parity

Classfunc pUse

Item

Data output pauseinfo
GLP output

aCai
ACAI function

Umin
Minimum unit masssmpl
Number of samples

ltUp

Parameter

 0
1
 0
1
2
0
 1
 0
1
2
 0
1
2
3
4
0

LCD backlight function

1
2
 3
4

5
CpHi Comparator upper limit
Cplo Comparator lower limit
Unit Weighing units to be displayedid

ID number for GLP output

Description
No pause (general equipment)
1.6 seconds (for the AD-8121)
No output
AD-8121 format
General format
Disabled

Interval between
continuous data
GLP output format

If “0” is set,no additional samples
required.
d=minimum display

Enabled1d
1/10d
Total sample mass 5d(*)
The number of
10 pcssamples to appear
25 pcsfirst when entered
50 pcsthe sample unit
100 pcs
mass storing mode
5 pcs
Conditions to turn
Always off
Turns off 5 seconds after the the backlight on or
off.
STABLE indicator turns on
Turns off 10 seconds after the Change in a weightvalue or key
STABLE indicator turns on
operation turns theTurns off 30 seconds after the backlight on.
STABLE indicator turns on
Turns off 60 seconds after the
STABLE indicator turns on
Always on
See
Sets the upper limit value“6. COMPARATOR”
Sets the lower limit value
See “8-4. Storing
Sets the weighing units
Sets the ID number

weighing units”
See “10. ID
NUMBER AND GLP”

 Factory setting( )* Even if the weight display is “5d,” there may be a range that it is not accepted. Thisis because the weight display data is rounded off internally.

25

9. RS-232C SERIAL INTERFACE
The scale is a data circuit-terminating equipment (DCE). Connect the scale to a data
terminal equipment (DTE) such as a personal computer and external devices using a
D-Sub 9-pin straight through cable.
 The RS-232C serial interface has the following four modes.
Stream mode
Outputs data continuously.
Key mode
Outputs data when the PRINT key is pressed.
Auto-print mode
Outputs data when the auto-print conditions are met.
Command mode
Controls the scale using commands from a personal
computer.
 Set the parameters of the data output mode (prt) and data format (bps andbtpr), as necessary.
 Windows Communication Tools Software (WinCT) to communicate with apersonal computer is provided as freeware. Visit the A&D website to download
WinCT.

9-1. Interface specifications
Transmission system
Transmission form
Data format

EIA RS-232C
Asynchronous, bi-directional, half-duplex
Baud rate:
1200, 2400, 4800, 9600 bps
Data bits:
7 bits + parity 1 bit (even or odd)
or 8 bits (non parity)
Start bit:
1 bit
Stop bit:
1 bit
Code:
ASCII
Terminator:
CRLF (CR: 0Dh, LF: 0Ah)
LSB
0

1

2

3

4

5

MSB
6

1 (-15V to -5V)
0 (5V to 15V)

Stop bit
Parity bit
Data bits
Start bit26

Pin assignments
Direction
Description
DCE-DTE
–
–
N.C.
TxD
→
Transmit data
RxD←
Receive data
–
–
N.C.
GND
–
Signal ground
DSR→
Data set ready
RTS←
Request to send
CTS→
Clear to send––
Used internally
Signal names of the scale side are the same as the
DTE side with TxD and RxD reversed.
Signal namePin No.
1
2
3
4
5
6
7
8
9

Scale (DCE)

External device (DTE)

TxD 2

RxD

RxD 3

TxD

RTS 7

RTS

CTS 8

CTS

DSR 6

DSR

GND 5

GND
Terminal example

Inside the scale27

9-2. Data format
S

T

,

+

0

0

0

Header

0

0

0

.

0

g CR LF

Data

Unit

Terminator(“ ” : space)

Separator A header of two characters indicates the scale condition:
ST : Stable weight data (including percentage data)
QT : Stable counting data
US : Unstable weight data (including counting and percentage data)
OL : Out of the weighing range (overloaded) The data is normally 9 digits including a decimal point and a polarity sign.
 Eight units are available:g : Weight data “gram”
k g : Weight data “kilogram”
P C : Counting data “pcs”% : Percentage data “%”o z : Weight data “decimal ounce”
l b : Weight data “decimal pound”
o z t : Weight data “troy ounce”
t l : Weight data “tael”
 The terminator is always CRLF.
 Output data example:
Weight data “gram”

S T

,

+ 0

0

1

2

3

4

.

5

g CR LF

Counting data “pcs”

Q T

,

+ 0

0 0

1

2

3

4

5

P C CR LF

Percentage data “%”

S T

,

+ 0

0 0

1

2

3

.

4

% CR LF

Out of range “gram” (+)

O L

,

+ 9

9 9

9

9

9

.

9

g CR LF

Out of range “pcs” (-)

O L

,

-

9 9

9

9

9

9

9

P C CR LF

28

99-3. Data output mode
Stream mode
Set the data output mode of the function list to “prt 0.”
The scale outputs the weight data currently displayed at each display update.
The scale does not output data while it is in the setting mode.
Key mode
Set the data output mode of the function list to “prt 1, 2 or 3.”
When the PRINT key is pressed while the weight data is stable (the STABLE
indicator is on), the scale outputs the data. When the data is output, the display blinks
one time.
Auto-print mode A
Set the data output mode of the function list to “prt 2.”
The scale outputs the weight data when the data is stable (the STABLE indicator is on)
and greater than +4d (of the R1 range for the EK-30KL).
The next output will be performed after the weight data returns below +4d.
Auto-print mode B
Set the data output mode of the function list to “prt 3.”
The scale outputs the weight data when the data is stable (the STABLE indicator is on)
and greater than +4d (of the R1 range for the EK-30KL) or less than -4d (of the R1
range for the EK-30KL).
The next output will be performed after the weight data returns between -4d and +4d.

9-4. Command mode
In the command mode, the scale is controlled by commands that come from apersonal computer.
Command list
 Command to request the current weight data.
Command

Q CR LF

Reply

S T , + 0 0 1 2 3 4 Command to zero or tare the scale (same as theCommand

Z CR LF

Reply

Z CR LF.

RE-ZERO Command to switch the weighing units (same as theCommand

U CR LF

Reply

U CR LF

29

5

MODE

g CR LF
key).

key).

10. ID NUMBER AND GLPThe ID number is used to identify the scale when Good Laboratory Practice (GLP) isused. The following GLP data is output to an AD-8121 printer or a personal computer
using the RS-232C interface.
 The results of calibration (“Calibration report”)
 The results of calibration test (“Calibration test report”)
 The “Start block” and “End block” for GLP data

10-1. Setting the ID number
1. With the power turned OFF, press and hold the
RE-ZERO key and press the ON/OFF key to turnthe power ON and enter the function setting mode.
func
appears.
Press several times
2. Press the MODE
id.

key several times to display

3. Press the PRINT key.
Enter the ID number using the following keys.
MODE

key

RE-ZEROkey

To select the digit to change thevalue. The selected digit blinks.
To change the value of the selecteddigit. See the table below for the“Display character set.”

Set using therelevant keys

4. Press the PRINT key to store the settings.
func
appears afterend .
To store

5. Press the ON/OFF key to turn the power OFF orpress the RE-ZERO key.
Display character set
0 1 2 3 4 5 6 7 8 9 -A B C D E F GH I J K L MNO P QR S T U VWX Y Z

0 1 2 3 4 5 6 7 8 9 -a b C d e f g H i j k l m n o p q r s t U v w x y z“ ” : Space30

10-2. GLP report To print the GLP report to an AD-8121B printer, select the function setting “info 1”
and “pUse 1” and use MODE 3 of the printer.
 To output the GLP report to a personal computer, select the function setting “info2” and “pUse 0.”
Calibration report
1. Perform calibration according to “7-3. Calibration
using a calibration weight.”

2.

end
appears when the calibration iscomplete.

3.

glp
output.

appears and calibration report isTo output the results

4.

end
appears again. Remove the weight.
Press the ON/OFF key to turn the power
OFF or press the RE-ZERO key.

AD-8121 format “info 1”

General format “info 2”
Manufacturer
Model
Serial number
ID number
Date
Time
Calibration
executed
Calibration weight
Column for
signature: Space, ASCII 20h
CR: Carriage return, ASCII 0Dh
LF: Line feed, ASCII 0Ah

31`~~~~~~~~~~A~&~D<CRLF>
MODEL~~~ EK-15KL<CRLF>
S/N~~~~6A6123456<CRLF>
ID~~~~~~~~ABCDEF<CRLF>
DATE<CRLF><CRLF>
TIME<CRLF><CRLF>CALIBRATED(EXT.)<CRLF>
CAL.WEIGHT<CRLF>~~~~~+15000.0~~ g <CRLF>
SIGNATURE<CRLF><CRLF><CRLF>---------------~<CRLF><CRLF><CRLF>

Calibration test report
The calibration test mode is used to compare a calibration weight with the calibration
test data weighed by the scale.
 This test does not perform calibration.

1. In the weighing mode, press and hold the
MODE and PRINT keys until CC
appears, and release the keys.
 Pressing and holding the CAL switch will also
display CC
after Cal. When CC
is displayed, release the CAL switch.
 The calibration test mode is not available when thefunction setting “info 0” is selected.
2.

CC 0

Release the keys

appears.

3. If necessary, change the value of the calibration
weight as described in Step
4 of “7-1.
Preparation.”
4. With nothing on the pan, press the RE-ZERO
key. The zero point is measured and the measured
value with the unit “g” is displayed for a few
seconds. Then, the value of the calibration weight
is displayed.

Weighing unit

5. Place a weight of the same value as displayed on
the pan and press the
RE-ZERO
key tomeasure it. The measured value with the unit “g” isdisplayed for a few seconds.
Weighing unit

6.

end

7.

glp
output.

appears.

appears and calibration test report isTo output the results

8.

end
appears again. Remove the weight.
Press the ON/OFF key to turn the power OFF orpress the RE-ZERO key.

32

AD-8121 format “info 1”

General format “info 2”
Manufacturer
Model
Serial number
ID number
Date
Time
Calibration
test
Zero value
Actual weightvalue
Calibration weight
Column for
signature: Space, ASCII 20h
CR: Carriage return, ASCII 0Dh
LF: Line feed, ASCII 0Ah~~~~~~~~~~~A~&~D<CRLF>
MODEL~~~ EK-15KL<CRLF>
S/N~~~~6A6123456<CRLF>
ID~~~~~~~~ABCDEF<CRLF>
DATE<CRLF><CRLF>
TIME<CRLF><CRLF>CAL.TEST(EXT.)<CRLF>
ACTUAL<CRLF>~~~~~~~~~~0.0~~ g <CRLF>~~~~~+15000.1~~ g <CRLF>
TARGET<CRLF>~~~~~+15000.0~~ g <CRLF>
SIGNATURE<CRLF><CRLF><CRLF>---------------~<CRLF><CRLF><CRLF>

Output of “Title block” and “End block”
When weight values are recorded as the GLP report,“Title block” and “End block” are added at the
beginning and at the end of a group of weight values.

Press and hold

Title block
1. In the weighing mode, press and hold thePRINT
key until
start
appears, andrelease the key. The scale outputs the “Title
block.”The scale returns to the weighing mode afterend .

To output “Title block”

2. Press the PRINT key or select the auto-print
mode to output the weight values.

To output the weight values
・
・
・

33

End block3. Press and hold the PRINT key until
recend appears, and release the key.
The scale outputs the “End block.”

Press and hold

4. The scale returns to the weighing mode afterend .
To output “End block”

AD-8121 format “info 1”

Title
block
Manufacturer
Model
Serial number
ID number
Date
Starting time

Weight data

General format “info 2”~~~~~~~~~~~A~&~D<CRLF>
MODEL~~~ EK-15KL<CRLF>
S/N~~~~6A6123456<CRLF>
ID~~~~~~~~ABCDEF<CRLF>
DATE<CRLF><CRLF>START<CRLF>
TIME<CRLF><CRLF><CRLF>
ST,+000123.4~~ g <CRLF>
ST,+000234.5~~ g <CRLF>
ST,+000345.6~~ g <CRLF>
ST,+000456.7~~ g <CRLF>

Ending time
Column for
signature

End
block
: Space, ASCII 20h
CR: Carriage return, ASCII 0Dh
LF: Line feed, ASCII 0Ah

34

END<CRLF>
TIME<CRLF><CRLF>
SIGNATURE<CRLF><CRLF><CRLF>---------------~<CRLF><CRLF><CRLF>

11. MAINTENANCE
11-1. Notes on maintenance Do not disassemble the scale. Contact your local A&D dealer if your scaleneeds service or repair.
 Use the original package for transportation.
 Do not use organic solvents to clean the scale. Use a lint free cloth lightly
moistened with a mild detergent.

11-2. Error codes
Overload error
An object beyond the weighing capacity has been placedon the pan.
Remove the object from the pan.
The scale has detected an excessive load.
Remove all objects from the pan.
Confirm that the weighing pan is correctly installed.
Underload error
The scale has detected an excessive upward force.
Check for anything trapped under the edge of theweighing pan.
Unit mass / 100% reference mass error
The unit mass / 100% reference mass is too light in the
counting / percent mode.

Sample quantity error
When the sample weight is light and the counting error
could become large, the scale prompts you to use alarger number of samples. Place the displayed number ofsamples on the pan and press the MODE key to store
the unit mass.
 Pressing theMODE
key without adding
samples is possible, but that will reduce counting
accuracy.
When starting with the 100 samples, 100 may be displayed if the sample weight is light.
If so, press the MODE key without adding any
samples.
When the function setting “aCai 0” (ACAIdisabled) or “Umin 2” is selected, this error will
not appear.

35

CAL error
Calibration has been canceled because the calibration
weight is too heavy.
Calibration has been canceled because the calibration
weight is too light.
Check the weighing pan and the calibration weight.
Press the ON/OFF key to turn the power OFF orpress the CAL switch to return to the weighing mode.
Low battery
The battery (OP-02) has depleted.
Stop using the scale immediately and recharge thebattery, or use the AC adapter to operate the scale.
AC adapter error
The output voltage of the AC adapter is too high.
Check if the AC adapter is correct for your local voltage
and receptacle type.
Stability error
The weight value is not stable and the scale cannot
display it.
Prevent vibration and drafts from affecting the scale.
Press the MODE key to return to the weighing mode.
Internal error (# = 2,3,4 or 6)
The scale detects an error in the internal processing.
Remove all objects from the pan. Turn the power OFF
and ON again. If the error persists, request service.
If you cannot resolve an error or other errors occur, request service from thestore where you purchased the scale or from your local A&D dealer.

36

12. SPECIFICATIONS
12-1. Specifications
MODEL
EK-15KL
EK-30KL
Weighing capacity
15 kg
3 kg
30 kg
Minimum display ”d”
0.1 g
0.1 g
1g
Number of samples
5, 10, 25, 50 or 100 pieces
Maximum count *)150,000 pieces
300,000 pieces
Minimum unit mass *)
0.1 g
0.1 g
Minimum % display
0.1 %
0.1 %
Repeatability (Standard deviation)
0.3 g
0.3 g
1g
Linearity±0.6 g±0.6 g±1 g
Sensitivity drift±20 ppm / °C (10°C to 30°C / 50°F to 86°F)
Display
7 segment LCD with backlight (Character height 22 mm)
Display update
Approximately 10 times per second
Operating temperature range/
10°C to 40°C / 14°F to 104°F
humidityLess than 85% R.H. (non-condensing)Power supply
AC adapter or optional lead-acid battery
Battery operating hours
Approximately 100 hours (at 25°C with backlight off)
Weighing pan size
300 mm x 210 mm
Mass (approximately)
4.2 kg
4.9 kgCalibration weight (factory setting)
15 kg
30 kg
*) In case of “Umin 0” (factory setting)12-2. Other weighing units
MODEL
EK-15KL
EK-30KL
Weighing capacity
529.110105.8201058.20oz.
Minimum display
0.005
0.005
0.05
Weighing capacity
33.06906.614066.140lb
Minimum display
0.00050.00050.005
Weighing capacity
482.260
96.450964.50ozt
Minimum display
0.005
0.005
0.05
Weighing capacity
396.830
79.365793.65tl
Minimum display
0.005
0.005
0.05
 The unit “tl (Hong Kong General / Singapore)” is for special versions only.

12-3. Option
OP-02: Sealed lead-acid battery (Recommended model: YUASA NP4-6)

37

12-4. External dimensions

Unit: mm38

GRAVITY ACCELERATION MAP
Values of gravity at various locations
Amsterdam
AthensAuckland NZ
BangkokBirmingham
Brussels
Buenos Aires
Cape Town
ChicagoCopenhagen
CyprusFrankfurt
Glasgow
HavanaHelsinki
Jakarta
Kolkata (Calcutta)
KuwaitLisbonLondon (Greenwich)
Los Angeles
Madrid

9.813 m/s2
9.800 m/s2
9.799 m/s2
9.783 m/s2
9.813 m/s2
9.811 m/s2
9.797 m/s2
9.796 m/s2
9.803 m/s2
9.816 m/s2
9.797 m/s2
9.811 m/s2
9.816 m/s2
9.788 m/s2
9.819 m/s2
9.781 m/s2
9.788 m/s2
9.793 m/s2
9.801 m/s2
9.812 m/s2
9.797 m/s2
9.802 m/s2

ManilaMelbourne
Mexico City
Milan
Moscow
New York
Oslo
OttawaParis
Rio de Janeiro
Rome
San Francisco
Singapore
Stockholm
SydneyTaichung
TaipeiTokyo
Vancouver, BC
Washington DC
Wellington NZ
Zurich39

9.784 m/s2
9.800 m/s2
9.786 m/s2
9.807 m/s2
9.816 m/s2
9.802 m/s2
9.819 m/s2
9.807 m/s2
9.810 m/s2
9.788 m/s2
9.803 m/s2
9.800 m/s2
9.780 m/s2
9.819 m/s2
9.796 m/s2
9.789 m/s2
9.790 m/s2
9.798 m/s2
9.810 m/s2
9.801 m/s2
9.803 m/s2
9.808 m/s2

World map

40

13

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