A&D BM series User manual

Analytical Balance
BM-20
BM-22
BM-252
BM-200
BM-300
BM-500
1WMPD4002195D

© 2018 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.
Windows, Word and Excel are registered trademarks of Microsoft Corporation.

BM series 1
Contents
Basic Operation
1. Introduction.............................................................................................................................. 3
1.1. Features............................................................................................................................... 4
1.2. Compliance.......................................................................................................................... 5
2. Unpacking the Balance ...........................................................................................................7
3. Installing the Balance and Precautions................................................................................. 10
3.1. Installing the Balance......................................................................................................... 10
3.2. Precautions Before Use..................................................................................................... 13
3.3. Precautions During Use..................................................................................................... 15
3.4. Precautions After Use ........................................................................................................ 16
3.5. Precautions for Power Supply ........................................................................................... 16
4. Display Symbols and Key Operation .................................................................................... 17
5. Weighing Units ...................................................................................................................... 18
5.1. Units ................................................................................................................................... 18
5.2. Storing Active Units ............................................................................................................21
5.3. Selecting Units and Weighing Modes................................................................................ 22
6. Weighing................................................................................................................................ 24
6.1. Basic Operation (Gram Mode) .......................................................................................... 24
6.2. Smart Range for the BM-22............................................................................................... 26
6.3. Counting Mode (PC).......................................................................................................... 27
6.4. Percent Mode (%).............................................................................................................. 29
6.5. Ionizer (Neutralization Device)........................................................................................... 30
6.6. Monitoring the Clock and Environmental Sensors ............................................................ 32
6.7. Repeatability Test............................................................................................................... 33
Adapting to the Environment
7. Response Adjustment ........................................................................................................... 34
7.1. Automatic Response Adjustment ...................................................................................... 34
7.2. Manual Response Adjustment........................................................................................... 35
8. Calibration ............................................................................................................................. 36
8.1. Calibration Group...............................................................................................................36
8.2. Automatic Self Calibration ................................................................................................. 37
8.3. Calibration Using the Internal Mass................................................................................... 38
8.4. Calibration Test Using the Internal Mass........................................................................... 39
8.5. Calibration Using an External Weight................................................................................ 40
8.6. Calibration Test Using an External Weight ........................................................................ 41
8.7. Correcting the Internal Mass Value ................................................................................... 42
Selecting Functions
9. Function Switch and Initialization.......................................................................................... 43
9.1. Permit or Inhibit.................................................................................................................. 43
9.2. Initializing the Balance ....................................................................................................... 44
10. Function Table ....................................................................................................................... 45
10.1. Setting the Function Table ................................................................................................. 45
10.2. Details of the Function Table ............................................................................................. 47
10.3. Description of the Class "Environment, Display"............................................................... 49
10.4. Description of the Item "Data Output Mode" ..................................................................... 51

2 BM series
10.5. Description of the Item "Data Format"............................................................................... 52
10.6. Data Format Examples...................................................................................................... 55
10.7. Clock and Calendar Function ............................................................................................ 57
11. ID Number and GLP Report.................................................................................................. 58
11.1. Setting the ID Number ....................................................................................................... 58
11.2. GLP Report........................................................................................................................ 59
12. Data Memory......................................................................................................................... 65
12.1. Notes on Using Data Memory ........................................................................................... 65
12.2. Data Memory for Weighing Data ....................................................................................... 65
12.3. Data Memory for Calibration and Calibration Test Data.................................................... 69
13. Underhook............................................................................................................................. 71
14. Density Measurement (Specific gravity) ............................................................................... 72
15. Password Function................................................................................................................ 75
15.1. Balance Software Version 1.50 to 1.64 ............................................................................. 75
15.2. Balance Software Version 1.660 or later ........................................................................... 76
15.3. Using the Password Function............................................................................................ 77
15.4. Entering the Password Before Weighing .......................................................................... 78
15.5. Logging Out ....................................................................................................................... 80
15.6. Storing or Changing the Password.................................................................................... 81
15.7. Changing the Password .................................................................................................... 82
15.8. Deleting the Password (U5ER 0 1～10)............................................................................ 83
15.9. Forgotten Password........................................................................................................... 83
Interface and Communication
16. Standard Input and Output Interface..................................................................................... 84
16.1. RS-232C Interface............................................................................................................. 84
16.2. Connecting to Peripheral Equipment................................................................................. 85
16.3. Commands ........................................................................................................................89
17. Key Lock Function................................................................................................................. 94
17.1. Locking All the Keys........................................................................................................... 94
17.2. Locking the Specified Keys................................................................................................ 95
18. Checking the Balance Software Version............................................................................... 95
Maintenance
19. Maintenance.......................................................................................................................... 96
19.1. Cleaning and Handling the Balance.................................................................................. 96
19.2. Error Codes........................................................................................................................ 96
19.3. Other Display ..................................................................................................................... 98
19.4. Checking the Balance Performance and Environment..................................................... 99
19.5. Asking for Repair ...............................................................................................................99
20. Specifications ...................................................................................................................... 100
20.1. External Dimensions........................................................................................................ 101
20.2. Options and Peripheral Equipment ................................................................................. 102
21. Terms/Index......................................................................................................................... 106
21.1. Terms ............................................................................................................................... 106
21.2. Index ................................................................................................................................ 107

BM series 3
1. Introduction
This manual describes how the BM series balances work and how to get the most out of them in
terms of performance. Read this manual thoroughly before using the balance and keep it at hand
for future reference.
About this manual
This manual consists of the following five parts:
Basic operation .............................. Describes precautions, the balance's construction and basic
operation.
Adapting to the environment........... Describes response (and stability) adjustment to adapt to the
environment where there is vibration or drafts, the way to
maintain weighing precision in a variation of ambient
temperature, calibration and calibration test.
Selecting functions.......................... Describes functions of the balance.
Interface and communication.......... Describes the serial interface used for communicating with a
computer that requests weighing data and controls the
balance, and for use with a printer
Maintenance .................................. Describes maintenance, error codes, troubleshooting,
specifications and options.
Balance software version
Some balance operations vary depending on the balance software version. For details on
checking the software version, refer to “18. Checking the Balance Software Version”.

4 BM series
1.1. Features
A built-in ionizer can eliminate static electricity from the weighing sample before weighing,
reducing weighing errors.
Each electrode unit of the ionizer is designed to be removed, cleaned and replaced.
Automatic self calibration, using the internal mass, adapting to changes in temperature.
Response adjustment adapting to drafts and/or vibration in the environment automatically.
Memory function to store weighing data and calibration data.
When only weighing data is stored, a maximum of 200 data can be stored.
Interval mode to store the weighing data periodically.
Good laboratory practice (GLP) / Good manufacturing practice (GMP) data can be output using
the RS-232C serial interface.
A built-in clock and calendar that can add the time and date to the output data. (Changing the
clock setting can be limited to the administrator. Refer to “15. Password Function”.)
The password function can be used to restrict balance users or changes to the function settings.
The key lock function disables the balance key operation and enables the balance to be operated
only by commands from external devices.
Underhook, for measuring density and weighing magnetic materials.
Multiple weighing units with most of the common units used around the world.
Gram, Milligram, Counting mode, Percent mode, Ounce (Avoir), Troy Ounce, Metric carat, Momme,
Pennyweight, Grain (UK), Tael (preset at the factory), Tola (India), Messghal and Density mode
The BM-22 is equipped with a smart range function to weigh in the precision range (minimum
display: 1 μg) after zeroing a tare weight, if within the weighing capacity.
The micro tube holder is included in the accessories of the BM-20 and BM-22.
Density mode for calculating the density of a solid.
The BM series balances are equipped with an RS-232C serial interface and a USB interface to
communicate with a computer. While outputting data to a printer using the RS-232C interface,
data can be transmitted to a computer at the same time using the USB interface.
Using the RS-232C interface and the Windows communication tools software (WinCT) enables bi-
directional communication between a Windows computer and the balance.
The current version of the WinCT can be downloaded from the A&D website.
Connecting the USB interface of the balance by a cable to a Windows computer allows
transmission of the weighing data to Excel or Word.
When multiple balances have the BM-08 Ethernet interface installed in place of the USB interface
and connected to a LAN, data can be acquired from each of them using the WinCT-Plus software.
When the accessory data logger (AD-1688) is connected, weighing data can be stored without
using a computer.

BM series 5
1.2. Compliance
1.2.1. 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 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.)
1.2.2. Compliance with Directives of CE mark
This device features radio interference suppression, safety regulation and restriction of Hazardous
Substances in compliance with the following Council Directives
Council directive 2004/108/EC EN61326 EMC directive
Council directive 2006/95/EC EN60950 Safety of Information Technology Equipment
Council directive 2011/65/EU EN50581 Restriction of the use of certain Hazardous Substances
The CE mark is an official mandatory European marking.
Please note that any electronic product must comply with local laws and regulations when sold or
used anywhere outside Europe.

6 BM series

BM series 7
2. Unpacking the Balance
Unpack the balance carefully. Keep the packing material to be used for transporting the balance
in the future. See the illustrations to confirm that everything is included.
Accessories for each model
BM-20, BM-22
BM-252
BM-500, BM-300,
BM-200
Small weighing Large weighing
pan for filter pan for filter
Weighing pan Pan support
Micro tube holder
Small fine range ring
Fine range ring
Tweezers
Dust plate AX-MX-36
15, 0.8 mL 12, 0.3 mL 8, 0.05 mL
Large Medium Small
Round aluminum analytical pans ( 10 pieces each )
Weighing pan Pan support
Fine range ring
Breeze break ring
Dust plate
Weighing pan
Pan support
Breeze break ring
Dust plate
Slide breeze break
A
X
-BM-035

8 BM series
Common accessories
Attach the AC adapter labels to the AC adapter
as shown in the illustration.
AC adapter AC adapter labels
Notes
Please confirm that the AC adapter type is correct for your local
voltage and receptacle type.
Please use the dedicated AC adapter specified for the balance.
Do not use the AC adapter provided with the balance for other
models or equipment with which the AC adapter may not be
compatible.
If you use the wrong AC adapter, the balance and other equipment
may not operate properly.
Data logger
AD-1688
The weighing data can be
stored when connected to
the RS-232C interface of
the balance.
USB cable
(approx. 1.8 m)
Display cover
(PET resin)
Separation plate
If unnecessary, remove it.
Tweezers
AD-1689
Tweezers for handling a weight.
Use it to avoid temperature changes
due to having your hand in the
weighing chamber, thus to perform
accurate calibration.
Body cover
Cover during storage to prevent dust and dirt contamination.
The cover can be used for the balance with the AC adapter and other cables
connected.
D-sub 9 pins
Positions to
p
lace the AC ada
p
ter labels

BM series 9
Ionizer
Electrode unit of the
ionizer
Separation plate
If unnecessary, remove it.
J
oint handle
When jointed to the right (left) glass
door handle, the right (left) glass
door can be opened or closed with
the left (right) joint handle.
Bubble spirit level
Leveling foot
Glass door handle
The handle for the glass door.
The handle can be jointed to the joint handle
Neutralization
area
Glass door handle
Display cover
LED of the ionizer
Example of BM
-
20
Weighing
chamber
Display
Keys
Grounding terminal
Anti-theft device
AC adapter jack
USB interface
External key
j
ack
Cap the terminal with the accessor
y
rubber cap when it is not used.
RS-232C serial interface
D-sub 9
p
ins
Outlet example

10 BM series
3. Installing the Balance and Precautions
3.1. Installing the Balance
1 Place the balance on a solid weighing table. Refer to "3.2. Precautions Before Use" for details on
a place to install the balance.
2 Assemble the weighing pan and other parts in accordance with the model and use as shown
below.
BM-500, BM-300, BM-200 BM-252
BM-20, BM-22
Weighing pan
Breeze break ring
Dust plate
Pan suppor
t
Use the fine range ring in place of the breeze break
ring to avoid errors caused by drafts when weighing
with a minimum display of 0.01 mg.
Fine range ring
Sectional view
Pan suppor
t
Weighing pan
Small
f
ine range ring
Dust plate
Fine range ring
Large weighing pan for filter
Small weighing pan for filter
Choose the weighing pan
appropriate to the filter size.
Micro tube holder
Use the holder for
micro tube or test
tube of 12 mm
or less.
Fine range ring
Note
The mounting
direction of the
dust plate.

BM series 11
Assembling the parts in the weighing chamber
3 If the separation plate is not necessary, remove the
screw and take the plate off. Refer to "3.1.2.
Removing and attaching the separation plate".
4 Adjust the level of the balance using the leveling feet.
(Refer to "Adjusting the Level" on page 14.)
5 Confirm that the AC adapter type is correct for your local
voltage and power receptacle type.
6 Connect the specified AC adapter to the balance. Warm
up the balance for at least one hour with nothing on the
weighing pan.
Screw
Hoo
k
Separation plate
Leveling
foot
BM-252, BM-500, BM-252
BM-300, BM-200
Bubble spirit level
BM-20, BM-22

12 BM series
Slide breeze brea
k
（doo
r
）
Weighing pan/
Pan support
(
Note 2
)
A
ttach the slide breeze
break (base) while pressing
the sponge part located at
the rear of the slide breeze
break (base) at an angle to
the wall surface. Weighing pan /
pan support
(Note.2)
Small weighing pan
for filter
3.1.1. Installing the slide breeze break BM-20 / BM-22
The slide breeze break improves weighing precision by reducing the negative effects from the
surrounding environment. It is installed inside the weighing chamber of the BM-20 / BM-22.
1 Determine positioning of the slide breeze break to align the slide breeze break (base) hole with the
weighing pan/pan support mounted section while pressing the sponge, located at the rear of the slide
breeze break (base), at an angle to the BM-20 or BM-22 wall surface.
2 Attach the weighing pan/pan support and he slide breeze break (door).
Note 1 There may be variations in weighing results after attaching the slide breeze break as it has not
adjusted to the surrounding temperature. Wait a while before making any measurements.
Note 2 The weighing pan / pan support or small weighing pan for filter provided with the BM-20 / BM-22
can be used.
Slide breeze brea
k
（base）

BM series 13
3.1.2. Removing and attaching the separation plate
Note Take care not to damage the separation plate when handling it.
Removing the separation plate
1 Support the separation plate and
remove the screw from the plate.
2 Lift the plate and remove the hooks.
3 Rotate the plate on the axis of the front edge.
Rotate the plate on the axis of the back edge.
4 Remove the plate from the chamber.
Attaching the separation plate
Use the arrows in reverse to attach the plate.
5 Insert the plate into the chamber.
6 Rotate the plate on the axis of the back edge.
Rotate the plate on the axis of the front edge.
Level the plate.
7 Insert the hooks and hook the plate.
8 Support the plate and secure the screw.
3.2. Precautions Before Use
To ensure that you get the most from your balance, please try to follow these conditions as closely as
possible, especially for the BM-20 and BM-22 that are sensitive.
The best operating temperature is about 20°C / 68°F at about 50% Relative Humidity.
The weighing room should be free of dust.
Clean the weighing chamber and its surroundings to prevent foreign matter from invading,
especially when weighing a very small amount of sample.
The weighing table should be solid and free from vibration, drafts (such as frequently opening
doors or windows) and as level as possible. We recommend that you use the anti-vibration
table (AD-1671) and the remote controller (AD-8922A) for the BM-20 and BM-22.
Do not install the balance where it will be subject to vibration. Corners of rooms on the first floor are best.
Do not install the balance near a heater, air conditioner, or in a breeze. The influence of breezes
can be reduced with the tabletop breeze break (AD-1672).
Do not install the balance in direct sunlight. Avoid excessive temperature changes.
Do not use the balance near other equipment which produces magnetic fields.
Adjust the level of the balance using the leveling feet.
Please warm up the balance for at least one hour. Plug in the AC adapter as usual.
Calibrate the balance if it is installed for the first time or relocated, or when a weighing pan is
replaced.
Ensure a stable power source when using the AC adapter.
Do not place or use the balance where there is flammable or corrosive gas present.
Hoo
k
Screw
Step 1
Step 1
Step 2
Step
3
Step
3
Step 4
Hoo
k
Separation plate

14 BM series
Adjusting the level
When the bubble is off to the left：
Turn the leveling foot on the rear right in the
clockwise direction.
Level
When the bubble is off to the right：
Turn the leveling foot on the rear left in the
clockwise direction.
Level
When the bubble is off to the backward
position：
Turn both leveling feet on the rear in the
counterclockwise direction at the same time.
Level
When the bubble is off to the forward
position：
Turn both leveling feet on the rear in the
clockwise direction at the same time.
Level
水平器
Red circle
Bubble
Up
Leveling foot
Down
Down
Leveling foot
Up
Bubble spirit level
OK NO

BM series 15
3.3. Precautions During Use
Note the following items to get accurate weighing data.
Discharge static electricity from the weighing material. When a
weighing sample (plastics, insulator, etc.) could have a static
charge, the weight value is influenced. Ground the balance, and
Eliminate the static electricity using the built-in ionizer.
Try to keep the ambient humidity at or above 45% RH in the room.
Use a metal shield case.
Wipe a charged material (plastic sample, etc.) with a damp cloth.
This balance uses a strong magnet as part of the balance assembly,
so please use caution when weighing magnetic materials. If there is
a problem, use the underhook (refer to "13. Underhook") to
suspend the material away from the influence of the magnet.
Eliminate temperature differences between the weighed sample and
the environment. When a sample is warmer (cooler) than the ambient
temperature, the sample will appear lighter (heavier) than the true
mass. This error is due to the rising (falling) draft around the sample. If
you touch the sample, the same type of error will occur. Do not touch
the sample directly with your hand. Use tweezers or other tools.
Do not drop things upon the weighing pan, or place a weight
beyond the range of the balance on the weighing pan.
Make each weighing gently and quickly to avoid errors due to
changes in the environmental conditions.
We recommend that the fine range ring and separation plate are
used to avoid weighing errors caused by drafts when weighing using
the BM-252 (minimum display: 0.01 mg).
We recommend that the small fine range ring, fine range ring and
separation plate are used to avoid weighing errors caused by drafts
when weighing using the BM-22 or BM-20 (minimum display: 0.01
mg and 0.001 mg). To reduce the influence of breezes, minimize
operation of doors of the weighing chamber. In addition, in order to
weigh more accurately while reducing the effects of the surrounding
environment, attach the slide breeze break to the weighing chamber.
The weighing value of the BM-22 and BM-20 may change after
the stabilization indicator is displayed. We recommend that you set
a certain amount of wait time (approx. 10 seconds) before reading
the value after the stabilization indicator is displayed.
If contamination may be a problem, perform sampling operations
outside the weighing chamber in order to prevent the sample from
scattering in the weighing chamber.
Take into consideration the affect of air buoyancy on a sample
when more accuracy is required.
Do not use a sharp instrument (such as a pencil or ball point pen) to
press the keys, use your finger only.
Grounding
Metal case
Charged material
Magnetic material
40°C20°C
Draft
Weighing pan
Fine range ring
BM-252
Shock
BM-20
BM-22
Fine range ring
Small fine range ring
Slide breeze brea
k

16 BM series
Press the RE-ZERO key before each weighing to prevent possible
errors.
Keep the balance interior free of foreign matter (dust, liquid or metal
fragments).
3.4. Precautions After Use
Avoid mechanical shock to your balance.
Do not disassemble the balance. Contact your local A&D dealer if your balance needs service
or repair.
Do not use solvents to clean the balance. For best cleaning, wipe with a dry lint free cloth or a
lint free cloth that is moistened with warm water and a mild detergent.
Keep the balance interior free of foreign matter (dust, liquid or metal fragments).
3.5. Precautions for Power Supply
Do not remove the AC adapter while the internal mass is in motion, for example, right after the
AC adapter is connected, or during calibration using the internal mass.
If the AC adapter is removed under the conditions described above, the internal mass will be
left unsecured, that may cause mechanical damage when the balance is moved.
Before removing the AC adapter, press the ON:OFF key and confirm that zero is displayed in
the weighing mode.
After connecting the AC adapter to the balance, warm up the balance for at least one hour
before weighing.
When the AC adapter is connected, the balance is in the standby mode if the standby indicator
is on. This is a normal state and does not harm the balance. For accurate weighing, we
recommend that the AC adapter be kept connected, especially for the BM-20 and BM-22.

BM series 17
4. Display Symbols and Key Operation
Display
The interval memory function is used to store the weighing data periodically. Refer to "12. Data Memory".
Key operation
Press and release the key immediately or "Click the key" ...................................................................
Press and hold the key (for approx. 2 seconds) ..............................................................................
Key When pressed and released When pressed and held (approx. 2 seconds)
Turns the display on and off. The standby indicator is displayed when the display is turned off.
When the display is turned on, the weighing mode is enabled. If the password function is
used, pa55 is displayed to prompt you to enter a password. Refer to "15.4. Entering
the Password Before Weighing".
This key is available anytime. Pressing the key during operation will interrupt the operation
and turn the display off.
Cancels the operation when performing
function settings.
Enters the calibration mode using the internal
mass.
Displays other items of the calibration menu.
Switches the preset weighing units stored
in the function table.
Refer to "5. Weighing Units".
Performs automatic response adjustment.
In the weighing mode, turns the minimum
weighing value on and off.
In the counting or percent mode, enters
the unit mass storing mode or reference
mass storing mode.
Displays the function table menu.
Refer to "10. Function Table".
Performs a repeatability test when pressed
and held for another 2 seconds after the
function table menu is displayed.
Refer to "6.7. Repeatability Test".
The key to output the weighing data to a
printer or personal computer (or store it in
memory) depending on the function table
settings. (Factory setting = output)
No function at the factory setting.
By changing the function table:
"Title block" and "End block" for GLP /
GMP report are output.
The data memory menu is displayed.
The key to set the display to zero.
The key to turn the ionizer on and off.
The key to monitor the time and date, and the environmental sensors (temperature, humidity, barometric
pressure), for several seconds. Refer to "6.6. Monitoring the Clock and Environmental Sensors".
Response indicato
r
for approx. 30
seconds when weighing starts.
The amount of stored data with data memory function
Humidity (%)
Standby indicator of
interval memor
y
function
ION mar
k
Unit
s
.
Refer to "5. Wei
g
hin
g
Units".
A
ctive indicato
r
of
interval memor
y
function
P
rio
r
notice indicator of
automatic self calibration
Stabilization indicato
r
The
c
urren
t
data numbe
r
Standby indicato
r
of power suppl
y
Blinking indicators
Weighing data or stored data
A
ctive processing indicato
r
Density mode, Display lock
Right and left glass door indicato
r
Barometric pressure (hPa)
Processing indicato
r

18 BM series
5. Weighing Units
5.1. Units
The units and weighing modes can be selected and stored in the function table as described in
"5.2. Storing Active Units".
The sequence of displaying them can be arranged to fit the frequency of use.
They are stored and are maintained in non-volatile memory, even if the AC adapter is removed.
If the law in your area permits, you may use all of the units. You can disable the units that you
don't regularly use. And you are able to turn them back on.
If a weighing mode (or unit of mass) has been turned off, that mode or unit will be missing in the
sequence. Tael has four varieties, one of which can be selected and installed at the factory.
Press the MODE key to select a unit or mode for weighing.
For details about the units and modes, see the table below:
Name (unit, mode) Abbreviation Display unit Conversion factor
Gram g
1 g
Milligram mg
0.001 g
Counting mode PC -
Percent mode % -
Ounce (Avoir) oz 28.349523125 g
Troy Ounce ozt 31.1034768 g
Metric Carat ct 0.2 g
Momme mom 3.75 g
Pennyweight dwt 1.55517384 g
Grain (UK) GN 0.06479891 g
Tael (HK general, Singapore) 37.7994 g
Tael (HK jewelry) 37.429 g
Tael (Taiwan) 37.5 g
Tael (China)
tl
31.25 g
Tola (India) t 11.6638038 g
Messghal m 4.6875 g
Density mode DS Refer to "14. Density Measurement"
Density mode
To use the density mode, it must be stored in the function table as described on page 21.
For details about this mode, refer to "14. Density Measurement".
To select the density mode, press the MODE key until the processing indictor blinks with
the unit "g" displayed.