A&D BM-20 User Manual

1WMPD4002195A

Analytical Balance

BM-20 BM-22 BM-252 BM-200 BM-300 BM-500

© 2010 A&D Company Ltd. 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 Ltd.

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 the Microsoft Corporation.

Contents

Basic Operation

1. Introduction.............................................................................................................................. 3

1.1. Features............................................................................................................................... 4

1.2. Compliance.......................................................................................................................... 5

2. Unpacking The Balance.......................................................................................................... 6

3. Installing The Balance And Precautions ................................................................................. 8

3.1. Installing The Balance ......................................................................................................... 8

3.2. Precautions Before Use (Environmental Condition And Preparations) ............................ 10

3.3. Cautions During Use (For Precision Weighing) ................................................................ 11

3.4. Cautions After Use (Management Of The Balance) ......................................................... 12

3.5. Cautions For Power Supply............................................................................................... 12

4. Display Symbols And Key Operation.................................................................................... 13

5. Weighing Units ...................................................................................................................... 14

5.1. Units................................................................................................................................... 14

5.2. Storing Active Units............................................................................................................17

5.3. Selecting Unit And Weighing Mode................................................................................... 18

6. Weighing................................................................................................................................ 20

6.1. Basic Operation (Gram Mode) .......................................................................................... 20

6.2. Smart Range For BM-22 ................................................................................................... 21

6.3. Counting Mode (PC).......................................................................................................... 22

6.4. Percent Mode (%).............................................................................................................. 24

6.5. Built-in DC Static Eliminator (Neutralization Device)......................................................... 25

6.6. Monitoring Clock and Environmental Sensors.................................................................. 27

6.7. Repeatability Test............................................................................................................... 28

Adapting To The Environment

7. Response Adjustment........................................................................................................... 29

7.1. Automatic Response Adjustment ...................................................................................... 29

7.2. Manual Response Adjustment .......................................................................................... 30

8. Calibration (To Adjust The Weighing Value).......................................................................... 31

8.1. Calibration Group...............................................................................................................31

8.2. Automatic Self Calibration (For variation of ambient temperature)................................... 32

8.3. One-Touch Calibration (For Common Use) ...................................................................... 32

8.4. Calibration Test Using the Internal Mass........................................................................... 33

8.5. Calibration Using An External Weight ............................................................................... 34

8.6. Calibration Test Using An External Weight........................................................................ 35

8.7. Correcting The Internal Mass Value .................................................................................. 36

9. Function Switch And Initialization.......................................................................................... 37

9.1. Permit Or Inhibit................................................................................................................. 37

9.2. Initializing The Balance...................................................................................................... 38

Selecting Functions

10. Function Table ....................................................................................................................... 39

10.1. Setting The Function Table ................................................................................................ 39

10.2. Details Of The Function Table ........................................................................................... 41

10.3. Description Of The Class "Environment, Display"............................................................. 43

BM series 1

10.4. Description Of The Item "Data Output Mode" ................................................................... 45

10.5. Description Of The Item "Data Format"............................................................................. 46

10.6. Data Format Examples...................................................................................................... 49

10.7. Clock And Calendar Function............................................................................................ 51

11. ID Number And GLP Report ................................................................................................. 52

11.1. Setting The ID Number...................................................................................................... 52

11.2. GLP Report........................................................................................................................ 53

12. Data Memory......................................................................................................................... 58

12.1. Notes On Using Data Memory .......................................................................................... 58

12.2. Data Memory For Weighing Data...................................................................................... 59

12.3. Data Memory For Calibration And Calibration Test ........................................................... 62

13. Underhook............................................................................................................................. 63

14. Density Measurement (Specific gravity) ............................................................................... 64

Interface And Communication

15. Standard Input And Output Interface..................................................................................... 67

15.1. RS-232C Interface............................................................................................................. 67

15.2. Connection To Peripheral Equipment................................................................................ 68

15.3. Commands ........................................................................................................................71

Maintenance

16. Maintenance.......................................................................................................................... 76

16.1. Treatment Of The Balance ................................................................................................ 76

16.2. Error Codes ....................................................................................................................... 76

16.3. Other Display..................................................................................................................... 78

16.4. Checking The Balance Performance And Environment ................................................... 79

16.5. Asking For Repair .............................................................................................................. 79

17. Specifications ........................................................................................................................ 80

17.1. External Dimensions.......................................................................................................... 81

17.2. Options And Peripheral Equipment................................................................................... 82

18. Terms/Index........................................................................................................................... 86

18.1. Terms ................................................................................................................................. 86

18.2. Index .................................................................................................................................. 87

2 BM series

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

Adapting to the environment

Selecting functions

Interface and communication

Maintenance

..............................

..........................

..................................

...........

..........

Describes precautions, the balance's construction and basic operation.

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.

Describes functions of the balance.

Describes the serial interface used for communicating with a computer that requests weighing data and controls the balance, and for use with a printer

Describes maintenance, error codes, troubleshooting, specifications and options.

BM series 3

1.1. Features

A built-in DC static eliminator can eliminate static electricity from the weighing sample before the

measurement, reducing weighing error.

Each electrode unit of the eliminator is designed to be removed, cleaned and replaced.

Automatic self calibration, using the internal mass, adapting to changes to temperature changes.

Response adjustment adapting to drafts and/or vibration 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) 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.

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 in the factory), Tola (India), Messghal, Density mode

BM-22 is equipped with a smart range function to weigh with the precision range (a higher

resolution) when zeroing a tare weight within the weighing capacity.

The test tube holder is included in the accessories of BM-20 and BM-22.

Density mode for calculating the density of a solid.

BM series balances are equipped with an RS-232C serial interface and a USB interface to

communicate with a computer. When printing data using the RS-232C interface, by using the USB interface, the data can be transmitted to a computer at the same time. Communications between the BM series balance using the RS-232C interface and a Windows computer using the Windows communication tools software (WinCT) make building a system very easy.

Connecting the USB interface of the balance, by 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.

The weighing data can be stored by connecting the accessory data logger (AD-1688) directly,

when not using a computer.

4 BM series

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 EMC Directives

This device features radio interference suppression and safety regulation in compliance

with the following Council Directives Council directive 89/336/EEC EN61326 EMC directive Council directive 73/23/EEC EN60950 Safety of Information Technology Equipment

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.

BM series 5

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 contained.

Parts For Each Products

BM-22, BM-20

Small weighing Large weighing pan for filter pan for filter

Weighing pan Pan support Test tube holder

Small fine range ring

Fine range ring Tweezers Dust plate AX-MX-36

φ15, 0.8 φ12, 0.3 φ8, 0.05 Large Medium Small Round aluminum analytical pans (

each 10 pieces

BM-252

Weighing pan Pan support

Fine range ring

Breeze break ring

Dust plate

)

BM-500, BM-300,

BM-200

Weighing pan

Pan support

Breeze break ring

Dust plate

Common Parts

AC adapter AC adapter labels

Note Please confirm that the AC adapter type is correct for your local voltage and receptacle type.

USB cable

6 BM series

Position of placing AC adapter labels

Display cover

Windows communication

software (WinCT)

Separation plate

If unnecessary, remove it.

D-sub 9pins

Data logger

AD-1688 The weighing data can be stored when connecting the data logger directly.

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.

The DC Static eliminator

Electrode units of the DC static eliminator

Separation plate

If unnecessary, remove it.

Leveling foot

oint handle

When jointing the right (left) slide door handle, the right (left) glass door can be opened or closed with the left (right) joint handle.

Bubble spirit level

Glass door handle

The handle for the glass door. The handle can be joined to the joint handle

USB interface

AC adaptor jack

External key jack

Cap the terminal with accessory rubber cap when it is not used.

Serial interface RS-232C

D-sub 9 pins

Anti theft device

Grounding terminal

LED of the static eliminator

Glass door handle

Neutralization

area

Example of BM-20

Weighing

chamber

Display

Keys

Display cover

BM series 7

3. Installing The Balance And Precautions

3.1. Installing The Balance

Step

1 Refer to "3.2. Precautions Before Use (Environmental Condition And Preparations)"

concerning the place to install the balance. Place the balance on a firm weighing table.

Step

2 Assemble the weighing pan and other parts in the weighing chamber, in accordance with the

product type and use.

BM-500, BM-300, BM-200 BM-252

Weighing pan

Pan support

Breeze break ring

Dust plate

BM-22, BM-20

Test tube holder

Large weighing pan for filter

Small weighing pan for filter

Weighing pan

Pan support

Small fine range ring

Fine range ring

Dust plate

Use the fine range ring to avoid errors caused by drafts when weighing with a minimum display of 0.01 mg.

Fine range ring

Choose the weighing pan to adapt to the filter size.

8 BM series

Use the holder for micro tube or test tube of φ12 mm or less.

Step

3 If the separation plate is not necessary, remove

the screw and take it off. Refer to next page "The Separation Plate".

Step

4 Adjust the level of the balance using the leveling feet.

Step

5 Confirm that the AC adaptor type is correct for your

local voltage and power receptacle type.

Step

6 Connect the specified AC adapter to the balance.

Warm up the balance for at least one hour with nothing on the weighing pan.

Step

7 Confirm correct weighing. If necessary, calibrate

the balance. Refer to "8. Calibration".

BM-200, BM-300, BM-500, BM-252

Leveling foot

Bubble spirit level

Note Please confirm that the AC adapter

type is correct for your local voltage and receptacle type.

Example of outlet

Separation plate

Screw

Hoo

BM-252

BM-22, BM-20

C adaptor jac

Grounding terminal

BM series 9

The Separation Plate

Note: Take care that the separation plate is not broken when operating it.

Removing the Separation Plate

Step

1 Support the separation plate and

remove the screw from the plate.

Step

2 Lift the plate and remove hooks.

Step

3 Rotate the plate on the axis of the back edge.

Rotate the plate on the axis of the front edge.

Step

4 Remove the plate from the chamber.

Screw

Hoo

Step

Attaching the Separation Plate

Use the arrows in reverse to attach the plate.

Step

5 Insert the plate into the chamber. (Reversed

Step

6 Rotate the plate on the axis of the front edge.

Level the plate. (Reversed

Step

Step Step

Step

1 2

Step

7 Insert hooks and hook the plate. (Reversed

Step

8 Install and fix the screw. (Reversed

Step

Hoo

Separation plate

3.2. Precautions Before Use (Environmental Condition And Preparations)

To ensure that you get the most from your balance, please try to follow these conditions as closely as

possible. Consider these conditions for BM-20 and BM-22 that are sensitive instrument specially.

The best operating temperature is about 20°C / 68°F at about 50% Relative Humidity.

The weighing room should be free of dust.

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 to use the anti-vibration table (AD-1670) and remote controller (AD-8922A) for BM-20 and BM-22.

Do not install the balance where it will be subject to vibration. Corners of rooms are best.

Do not install the balance near a heater, air conditioner, or in a breeze.

Do not install the balance in direct sunlight and 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 before using and after moving it to another location.

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.

10 BM series

3.3. Cautions During Use (For Precision Weighing)

Note the following items to get accurate weighing data.

Discharge static electricity from the weighing material. When

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 static eliminator. 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 (on the bottom of the balance) 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 next the sample. If

you touch the sample, the same type error will occur. Do not touch the

sample directly with your hand. Use tweezers or other tools.

Charged material

Metal case

Grounding

Magnet material

Draft

40°C 20°C

Weighing pan

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 error caused by drafts when BM-252 displays

a weighing value in unit of 0.01 mg (minimum display: 0.01 mg).

We recommend that the small fine range ring, fine range ring

and separation plate are used to avoid weighing error caused by

drafts when BM-22 and BM-20 display a weighing value in unit of

0.01 mg and 0.001 mg (minimum display: 0.01 mg and 0.001 mg).

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.

Press the RE-ZERO key before each weighing to prevent possible

errors.

Shock

Fine range ring

BM-252

Small fine range ring Fine range ring

BM-20 BM-22

Avoid foreign matter (dust, liquid or metal fragments) that could get

inside the balance.

Operate your balance gently. Shorten the operation time as much

as possible (Opening and closing door, putting and removing

sample). Use a pair of tweezers to avoid temperature changes due

to heat from inserting your hand into the weighing chamber.

BM series 11

3.4. Cautions After Use (Management Of The Balance)

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.

Avoid foreign matter (dust, liquid or metal fragments) that could get inside the balance.

3.5. Cautions 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, confirm that zero is displayed in the weighing mode, then

press the ON:OFF key.

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 you always plug in your balance so it can warm up.

Connect the AC adapter for BM-22 and BM-20 normally.

12 BM series

4. Display Symbols And Key Operation

Display

Processing indicator Weighing in liquid of density mode

Stabilization indicator

Standby indicator of power suppl

Weighing data or stored data The current data numbe

Weighing in air of density mode

rior notice indicator of

automatic self calibration

The interval memory function is used to store periodical weighing data. Refer to "12. Data Memory".

Blinking indicators

The amount of stored data with data memory function Humidity (%)

Response indicator for approx. 30 seconds when weighing starts.

Right and left glass door indicato Air pressure (hPa)

Standby indicator of interval memory function

Indicator of static eliminato

Units. Refer to "5. WeighingUnits".

ctive indicator of

interval memory function

Key Operation

Press and release the key immediately or "Click the key"

Press and hold the key

.......................................................................................................................

..................................................................

Key When pressed and released When pressed and held

The key to turn the display ON and OFF. The standby indicator is displayed when the display is turned off. The weighing mode is enabled when the display is turned on. This key is available anytime. Pressing the key during operation will interrupt the operation and turn the display OFF.

The key to perform calibration using the internal mass.

The key to switch the preset weighing units stored in the function table. Refer to "5. Weighing Units".

In the weighing mode, the key to turn the

minimum weighing value ON and OFF.

In the counting or percent mode, the key

to enter the sampling mode.

The key to outputs the weighing data to a printer or personal computer (or store it in memory) depending on the function table settings. (Factory setting = output)

The key to display other items of the calibration menu.

The key to perform automatic response adjustment.

The key to enter the function table mode or repeatability test mode. Refer to "10. Function Table" or "6.7. Repeatability Test".

No function at factory setting. By changing the function table:

"Title block" and "End block" for GLP

report are output.

The data memory menu is displayed.

The key to set the display to zero.

The key to turn the static eliminator ON and OFF.

The key to monitor the date and time, and the environmental sensors (temperature, humidity, air pressure), for several seconds. Refer to "6.6. Monitoring Clock and Environmental Sensors".

BM series 13

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 The 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

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)

Tola (India) t 11.6638038 g

Messghal m 4.6875 g

1 g

31.25 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 17.

For details about this mode, refer to "14. Density Measurement".

To select this mode, press the MODE key until the processing indictor blinks with the unit

"g" displayed.

14 BM series

Capacity And Minimum Display For BM-252, BM-500, BM-300, BM-200

The tables below indicate the weighing capacity and the minimum display for each balance.

Unit

Gram 520 320 220 0.0001

Milligram 520000 320000 220000 0.1

Ounce (Avoir) 18.34 11.29 7.76 0.00001

Troy Ounce 16.72 10.29 7.07 0.00001

Metric Carat 2600 1600 1100 0.001

Momme 138.7 85.3 58.7 0.0001

Pennyweight 334.4 205.8 141.5 0.0001

Grain (UK) 8024 4938 3395 0.002

Tael (HK general, Singapore) 13.76 8.47 5.82 0.00001

Tael (HK jewelry) 13.89 8.55 5.88 0.00001

Tael (Taiwan) 13.87 8.53 5.87 0.00001

Tael (China) 16.64 10.24 7.04 0.00001

Tola (India) 44.58 27.44 18.86 0.00001

Messghal 110.9 68.3 46.9 0.0001

BM-500 BM-300 BM-200

Capacity Minimum display

Unit

Capacity Minimum display

Gram 250 0.00001

Milligram 250000 0.01

Ounce (Avoir) 8.82 0.000001

Troy Ounce 8.03 0.000001

Metric Carat 1250 0.0001

Momme 66.67 0.00001

Pennyweight 160.7 0.00001

Grain (UK) 3858 0.0002

Tael (HK general, Singapore) 6.61 0.000001

Tael (HK jewelry) 6.68 0.000001

Tael (Taiwan) 6.67 0.000001

Tael (China) 8.00 0.000001

Tola (India) 21.43 0.000001

BM-252

Messghal 53.3 0.00001

BM series 15

Capacity And Minimum Display For BM-22, BM-20

BM-22 is equipped the precision range and standard range of the smart range function.

BM-20

Unit

Gram 22 0.000001

Milligram 22000 0.001

Ounce (Avoir) 0.776 0.0000001

Troy Ounce 0.707 0.0000001

Metric Carat 110 0.00001

Momme 5.87 0.000001

Pennyweight 14.15 0.000001

Grain (UK) 339.5 0.00002

Tael (HK general, Singapore) 0.582 0.0000001

Tael (HK jewelry) 0.588 0.0000001

Tael (Taiwan) 0.587 0.0000001

Tael (China) 0.704 0.0000001

Tola (India) 1.886 0.0000001

Messghal 4.69 0.000001

Precision range

Capacity Minimum display

BM-22

Unit

Gram 5.1 0.000001 22 0.00001

Milligram 5100 0.001 22000 0.01

Ounce (Avoir) 0.180 0.0000001 0.776 0.000001

Troy Ounce 0.164 0.0000001 0.707 0.000001

Metric Carat 25.5 0.00001 110 0.0001

Momme 1.36 0.000001 5.87 0.00001

Pennyweight 3.28 0.000001 14.15 0.00001

Grain (UK) 78.71 0.00002 339.5 0.0002

Tael (HK general, Singapore) 0.135 0.0000001 0.582 0.000001

Tael (HK jewelry) 0.136 0.0000001 0.588 0.000001

Tael (Taiwan) 0.136 0.0000001 0.587 0.000001

Tael (China) 0.163 0.0000001 0.704 0.000001

Precision range Standard range

Capacity Minimum display Capacity Minimum display

Tola (India) 0.437 0.0000001 1.886 0.000001

Messghal 1.09 0.000001 4.69 0.00001

16 BM series

5.2. Storing Active Units

The units and modes can be selected and stored in the function table.

The sequence of displaying them can be arranged to fit the frequency of use.

The units stored are maintained in non-volatile memory, even if the AC adapter is removed.

1 Press and hold the RANGE key until ba5fnc of

the function table is displayed in the weighing mode,

then release the key.

2 Press the RANGE key several times to display Unit .

3 Press the PRINT key to enter the unit selection mode.

4 Specify a unit or mode in the order to be displayed

using the following keys. RANGE key RE-ZERO key

Examples

Gram g

Milligram mg

.........

To display the units sequentially.

......

To specify a unit or mode. The indicator appears when the displayed unit or mode is specified.

Unit Display

The indicator is displayed at the units specified.

Press and hold

Press several time

Selection ke

Example

Specify the uni

Counting mode PC

Percent mode %

Density mode DS

5 Press the PRINT key to store the units or modes.

The balance displays end and then displays the next

menu item of the function table.

6 Press the CAL key to exit the function table.

Then the balance returns to the weighing mode with the

selected unit.

Store them

BM series 17

5.3. Selecting Unit And Weighing Mode

Preset the sequence of displaying units and

weighing modes to fit the frequency of use.

Refer to "5.2 . Storing The Active Units".

Pressing the MODE key in the weighing mode,

the unit and weighing mode can be displayed in

order.

BM-22 and BM-20 are preset units in the

factory. (Milligram), (Gram) is displayed

in order.

For BM-252, BM-500, BM-300 and BM-200

are preset units in the factory.

(Gram), (Milligram) is displayed in order.

Density mode

To use the density mode, it must be stored in

the function table as described on page 17. Refer to "14. Density Measurement" for details about the mode.

To select this mode, press the MODE key

until the processing indictor blinks with the unit "g" displayed.

The unit sequence of the factory settings.

Turning on the display.

BM-252 BM-500 BM-20 BM-300 BM-22 BM-200

Counting mode

Percent mode

Ounce (Avoir)

Troy Ounce

Metric Cara

Momme

Pennyweigh

Grain (UK)

Tael

Tola (India)

Messghal

Density mode

18 BM series

5.3.1. Unit Setting Example

The example below sets the units in the order with g (gram) as the first unit followed by PC

(counting mode).

1 Press and hold the RANGE key until ba5fnc of the

function table is displayed in the weighing mode, then release the key.

2 Press the RANGE key several times to display Unit .

3 Press the PRINT key to enter the unit selection mode.

4 Press the RE-ZERO key to specify the unit of g.

The stabilization indicator appears when the unit is specified.

5 Press the RANGE key several times to display Unit .

6 Press the RE-ZERO key to specify the unit of pcs.

The stabilization indicator appears when the unit is specified.

7 Press the PRINT key to store the units.

The balance displays end and then displays the next menu item of the function table.

8 Press the CAL key to exit the function table. Then the

balance returns to the weighing mode with g, the unit selected first.

9 Press the MODE key to switch between g and PC.

Specify counting mod

Press and hold

Press several time

Specify gram

Press several time

Store them

BM series 19

6. Weighing

Precautions for the weighing operation

Press the RE-ZERO key each time, before placing a sample on the weighing pan, to prevent

possible errors. Place a sample in the center of the weighing pan gently. Temperature changes during measurement may cause weighing error. Shorten the operation time as much as possible. ( Use a pair of tweezers to avoid a temperature change due to having your hand in the weighing

chamber.

Material with an electrostatic charge or that is magnetic may cause a weighing error. Do not press keys with a sharp instrument (such as a pencil or ball point pen). Do not drop things on the pan, or place a weight on the pan that is beyond the weighing range. Calibrate your balance periodically to maintain weighing accuracy. Refer to section "8. Calibration". Keep the area clean and dry. Consider section "3. Precautions" for the weighing operation. For precision weighing, keep the AC adapter connected to the balance.

6.1. Basic Operation (Gram Mode)

Opening and closing door, putting and removing sample)

Refer to section "4. Display symbols and Key operation" before operation.

Note When turning on the balance with a tare weight placed on

the pan, the balance automatically displays the zero display.

1 Turn on the balance using the ON:OFF key.

2 Select a preset unit using the MODE key, if necessary.

3 Place the tare (container) on the weighing pan, if necessary. Press the RE-ZERO key to cancel the tare weight.

Then zero is displayed.

Tare : A vessel placed on the pan, but not

to be included in the weighing data. Example: Container.

4 Place a sample on the pan or in the container.

Close the door.

5 Wait for the stabilization indicator to be

displayed, then read the value.

6 Remove the sample and container from the pan.

Stabilization

indicator

Zero displa

Close door

tabilization

indicato

Press the key

to select a unit,

if necessary.

Ta r e

(Container)

Weighing pan

Sample

Glass door is

not closed

Information

Remove them

20 BM series

6.2. Smart Range For BM-22

The smart range for BM-22 consists of the standard range and precision range (high resolution). Smart range function

These ranges can be switched by the weighing value automatically. When placing the tare weight within the standard range, if pressing the RE-ZERO key, the

weighing sample can be weighed within the precision range.

When pressing RANGE key, the current range is fixed to the standard range.

Example

1 Press the RE-ZERO key to use the precision range.

The balance displays zero.

2 Place the container (tare) on the weighing pan.

When mass of the container (tare) is within the standard range, the current range is automatically switched to the standard range.

3 Press the RE-ZERO key to use the precision range.

The balance displays zero.

4 Place the weighing sample in the container (tare).

When the sample is within the precision range, the weighing value can be read in high resolution.

Precision range

Container (Tare)

Standard range

Precision range

Weighing matte

Precision range

Precision Range And Standard Range For BM-22

Unit Precision range Standard range

Milligram 0.000 to 5100.009 5100.01 to 22000.84

Gram 0.000000 to 5.100009 5.10001 to 22.00084

Refer to page 14 for other units.

BM series 21

6.3. Counting Mode (PC)

This is the mode to determine the number of objects in a sample based on the standard sample

unit mass. The unit mass means an average mass of the samples. The smaller the variation in

the samples, the more accurate the count will be. The balance is equipped with the Automatic

Counting Accuracy Improvement (ACAI) function to improve the counting accuracy.

Notes

Use samples with a unit mass of 1 mg or more for counting. If the sample unit mass variable is too large, it may cause a counting error. To improve the counting performance, use the ACAI function frequently or divide the samples into

several groups and count each group.

Selecting the counting mode

1 Press the MODE key to select the unit (counting mode).

Storing a sample unit mass (Weighing input mode)

2 Press the RANGE key to enter the sample unit mass storing mode.

3 Select the number of samples using the RANGE key.

It may be set to 10, 25, 50 or 100.

Advise

4 Place a tare (container) on the weighing pan, if necessary.

A greater number of samples will yield more accurate

counting result.

Press the RE-ZERO key to cancel the weight (tare).

The number specified in step 3 appears.

Example

: 25 0 is displayed if 25 is selected in step 3.

Weighing pan

Tare

(Container)

5 Place the number of samples specified on the pan.

In this example, 25 pieces.

6 Wait for the stabilization indicator to be displayed.

Press the PRINT key to calculate and store the unit mass.

Then the balance displays 25 and is set to count samples

with this unit mass. To improve the accuracy of the unit mass,

proceed to step 8.

Notes

If the balance judges that the mass of the samples is too light to

acquire accurate weighing, it displays an error requiring the

addition of more samples to the specified number.

Example: 50 - appears, requiring 25 more samples. Add

25 samples and press the PRINT key. When the unit mass is

stored correctly, the balance proceeds to the counting mode.

If the balance judges that the mass of the samples is too light (

0.0001g

The sample unit mass is stored in non-volatile memory, and is

maintained even if the AC adapter is removed.

) and can not be stored as the unit mass, it displays lo .

under

25 samples

Step

8 when using

the ACAI function.

Place samples

Counting Operation

7 Place the samples to be counted on the pan.

Read the result and remove them from the pan.

22 BM series

Counting result

Counting mode using the ACAI function

The ACAI is a function that improves the accuracy of the unit mass automatically by increasing

the number of samples as the counting process.

ACAI: Automatic Counting Accuracy Improvement

Proceed to step 8 after storing a unit mass at last page.

8 If a few more samples are added, the processing

indicator turns on. To prevent an error, add three or

more. The processing indicator does not turn on if

overloaded. Try to add the same number of samples

as displayed.

9 The balance re-calculates the unit mass while the

processing indicator is blinking. Do not touch the

balance or samples on the pan until the processing

indicator turns off.

10 Counting accuracy is improved when the processing

indicator turns off.

Each time the above operation is performed, a more

accurate unit mass will be obtained. There is no

definite upper limit to the ACAI range for the number

of samples exceeding 100. Try to add the same

number of samples as displayed.

11 Remove all the samples used in ACAI and proceed

with the counting operation using the improved unit

mass.

dd a few more

samples.

The mark turns on

at proper range.

The mark turns on

and off during

calculation.

The mark turns off after the unit mass

is improved.

From at last page

step

Repea

BM series 23

6.4. Percent Mode (%)

The percent mode displays the weight value in percentage compared to a 100% reference mass

and is used for target weighing or checking the sample variance.

Selecting the percent mode

1 Press the MODE key to select the unit % (Percent mode).

If the percent mode can not be selected, refer to "5. Weighing Units".

Storing the 100% reference mass

2 Press the RANGE key to enter the 100% reference mass

storing mode.

Weighing pan

3 Place a tare (container) on the weighing pan, if necessary.

Press the RE-ZERO key to cancel the weight (tare).

The balance displays 100 0 % .

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

the pan or in the container.

5 Press the PRINT key to store the reference mass.

The balance displays 100.00 % .

Note

The decimal point position can be changed by the 100% mass.

BM-252, BM-500 BM-300, BM-200

100% mass

0.0100 g to 0.0999 g 1 % 0.00100 g to 0.0099 g 1 %

0.1000 g to 0.9999 g 0.1 % 0.01000 g to 0.0999 g 0.1 %

1.0000 g to 0.01 % 0.10000 g to 0.01 %

If the balance judges that the mass of the sample is too light

(

under 0.01g

) to be used as a reference, it displays lo .

Minimum

display

BM-20, BM-22

100% mass

Minimum

display

Tare

(Container)

100% mass

A 100% reference mass can be stored in the non-volatile

memory and is maintained even if the AC adapter is removed.

6 Remove the sample.

Reading the percentage

7 Place a sample to be compared to the reference mass on

the pan. The displayed percentage is based on the 100%

reference mass.

24 BM series

Place sample

Percentage

6.5. Built-in DC Static Eliminator (Neutralization Device)

The BM series is equipped with four DC static eliminator electrode units to neutralize static

electricity from a charged weighing sample. When neutralizing static electricity before weighing, stability can be improved, reducing error.

Neutralizing ion : The discharge electrodes of the built-in DC static eliminator continuously

generate bipolar ions by corona discharge. Applying these ions to the weighing sample neutralizes the static charge.

Static electricity : In general, when the ambient humidity is less than 45%RH, powders, paper,

plastic, nonconductors, etc., easily become charged with static electricity. The influence of the static electricity may cause a weighing error of several milligrams. The static eliminator effectively neutralizes the electrical charge.

Operation

1 Place the sample to be weighed on the center

(of the metallic circle) of the separation plate to neutralize the static charge.

2 Press the ION key to start the neutralization.

The mark and the LED flash. The neutralization will stop after the preset time of "Neutralizing time (ion)" in the function table (the factory setting is 3 seconds).

LED

Static eliminator

Sample

Separation plate

The minimum display of BM-20, BM-22 and BM-252 is

switched to 0.1 mg while performing the neutralization.

When pressing the ION key during the neutralization,

the neutralization stops.

Note

Keep a space between electrodes and the weighing sample.

Placing the sample to close to an electrode may cause the sample to become charged.

Remove any obstacle between electrodes and the weighing sample.

In the neutralization

Weighing displa

Maintenance Of The Electrode Unit

In general, when using the eliminator for a long time, dust and

stains may stick to the electrodes. Clean them periodically to maintain performance.

When pins of the electrode are rubbed down and the

neutralization function does not recover after cleaning them, replace the electrodes with four new units. The standard life time is approximately 10000 hours.

Replacing Electrode Unit

1 Turn the electrode unit 45 degrees counterclockwise. Remove it.

Example: Display of BM-20,

BM-22, BM-252

Step

Cleaning

Electrode

2 Replace all four units with new ones at the same time.

Note

Do not remove and clean the electrodes while the mark and the LED are flashing.

BM series 25

Electrode uni

Remote Control Of The DC Static Eliminator

AX-T

When specifying "on" to [AD8922 control] in the function

settings (8922 ionfnc on), the balance applies the function of the ION key to the MODE key on the AD-8922.

When specifying "2" to [External control input ] in the function

settings (e-5 ionfnc 2) and assembling external key plug

(AX-T-314A-S) and foot switch (AX-SW128), the balance

applies the function of the ION key to the foot switch

Applies the ION key to the MODE key on the AD-8922A.

Example:

External key plug

(AX-T-314A-S)

Ter mi na l 1

Line 1 GND

Applies the ION key to terminal 1of the foot switch (AX-SW-123).

Description Of The External Key Plug (AX-T-314A-S) (Option)

External key plug

When specifying [External control input (e-5)] in [Static eliminator (ionfnc)], the following

functions can be applied to the external key plug (AX-T-314A-S) terminals.

Static eliminator External control input Terminal 1 Terminal 2

-314A-S

Ter mi na l 2 Ter mi na l 1

Terminal GND

Line 1 Line 2 GND

ionfnc e-5 0 PRINT key RE-ZERO key ionfnc e-5 1 PRINT key ION key ionfnc e-5 2 ION key RE-ZERO key

factory settings

26 BM series

6.6. Monitoring Clock and Environmental Sensors

ature

In the weighing mode, the built-in clock and environmental sensors (temperature, humidity, air pressure) can be monitored and temperature data can be output with the function settings.

Specifications Of The Environmental Sensors

Sensor Resolution Measurement range Applicable range Temperature ±1.5 °C 5 °C to 40 °C

Humidity ±10 % 0 % to 100 %

Air pressure ±10 hPa 300 hPa to 1100 hPa

5 °C to 40 °C

Caution

The environmental sensors are built into the case. Therefore, these values are not in accordance

with the environmental condition.

Refer to "17. Specifications" for operating condition of the product.

Operation

Press the SELECT key in the weighing

mode. The current time, date and sensor values (temperature, humidity, air pressure) are displayed for several seconds in order. The balance returns to the weighing mode automatically.

If pressing the SELECT key while

displaying current data, the display proceeds to next data.

If pressing the CAL key while

displaying current data, the balance returns to weighing mode.

Environmental sensor

Weighing mod

Tim

5 second

Dat

5 second

10 second

Weighing mod

Humidit

ir pressure

Temper

Note

If adjusting the built-in clock, refer to "10.7.Clock And Calendar Function". If appending time and date to data output, refer to the [Time/Date output (5-td)] of

"10.2.Details Of The Function Table".

If appending temperature data to the data output, refer to [Temperature output (5-tp)] of

"10.2.Details Of The Function Table".

BM series 27

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