A&D GXA-25 User manual

GXA-25 External fanless ionizer
1WMPD4003577

© 2018A&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 ofA&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.

1
Contents
Introduction.............................................................................................................................................. 2
1. Features of the Option......................................................................................................................... 2
1.1. Part Names................................................................................................................................... 3
1.2. How to Install ................................................................................................................................ 3
1.3. How to Use................................................................................................................................... 4
1.5. Controlling the Ionizer Externally.................................................................................................. 6
2. Function Settings of the Balance........................................................................................................ 7
2.1. Display for Function Settings and Operation Keys ...................................................................... 7
2.2. Items List ...................................................................................................................................... 8
3. Maintenance of the Electrode Unit...................................................................................................... 9
4．Specifications..................................................................................................................................... 9
5．Option ................................................................................................................................................ 9

2
Introduction
This manual describes how the GXA-25 External fanless ionizer (static eliminator) work and how to
get the most out of them in terms of performance. Read this manual thoroughly before using the
ionizer and keep it at hand for future reference.
１．Features of the Option
□ A fanless DC ionizer (static eliminator) can eliminate static electricity from the weighing sample
before the measurement, reducing weighing error.
(Bipolar ions are generated by DC corona discharge and the target is irradiated by those to
neutralize it.)
□ Each electrode unit of the ionizer is designed to be removed, cleaned and replaced.
□ An IR (touchless) switch is attached to the ionizer, and neutralization can be started without
touching the ionizer.
□ Power is supplied from the balance to allow the ionizer to be operated without using an AC
adapter.
□ PRINT or RE-ZERO or the neutralization function for the ionizer can be operated by using the
accessory foot switch (AX-SW137-PRINT or AX-SW137-REZERO).
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 ionizer effectively neutralizes the electrical charge.

3
1.1. Part Names
I/F board
1.2. How to Install
Caution Disconnect the AC adaptor before installing the option to the
balance.
1. Remove the two screws from the panel. Pull gently the cable
and option board from the balance.
Balance rear side
2. Peel off the connector that is affixed to the panel with double-sided
tape and insert it into the socket of the option board.
3. Attach the option board to the balance.
Secure with the two screws removed in step 1.
Balance rear side
4. Connect using the connection cable (60 cm) between the I/F
board and Ionizer.
Connector for I/F board
Stand Connection cable (60 cm)
LED
IR (touchless) switch
External input
connector Connector for the
ionizer
Ionizer (front side) Ionizer (rear side)
Connector for IR
switch
Double-sided tape
Electrodes

4
5. Place the ionizer on the stand and set it up onthe side of the balance.
(Secure the ionizer to the stand using the double-sided tape on
the stand if necessary)
1.3. How to Use
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.
The electrodes must notbetouched with tweezers,etc.whileneutralizing.
1. Place the weighing sample to be neutralized in front of the ionizer.
At this time, the weighing sample to be neutralized must be kept in a range of approx. 10 cm to 30 cm from
the electrodes as shown in the figure below.
Neutralization ion generation distribution
Top view
Side view
Weighing sample
Electrodes
Ion
area
10cm 20cm 30cm 50cm
Effective
neutralization
area
Effective
neutralization
area
Ion
area
Stand
Double-sided tape

5
2. Bring the your hand close to the IR (touchless) switch located at the center of the ionizer.
When the IR switch responds to the hand, the ION mark on the balance’s display and the ionizer’s
LED light up and neutralization starts. When an interval (three seconds at factory settings) set in
the balance’s function settings beforehand has passed, neutralization stops automatically. While
neutralizing, make sure that the weighing sample is lifted up approx. 2 cm or more and is
neutralized until the ION mark at the balance’s display and the LED at the ionizer turn off.
Lift up the weighing
sample approx.
2 cm ormore.
□ When a balance with a minimum display of 0.001g is used, the balance operates using a
minimum display of 0.01g while the ionizer is operated, and then the balance automatically
returns to the previous weighing mode when operations for the ionizer are completed..
□ While neutralizing, make sure that the weighing sample is lifted up and is neutralized until the
ION mark at the balance’s display and the LED at the ionizer turn off. Failure to do so may
result in the weighing sample not being sufficiently neutralized and cause weighing errors.
□ The neutralization interval can be changed using the balance’s function settings. (Refer to “2.
Function Settings of the Balance”)
(Reference) at 4kV electrical charge
Distance 10 cm 20 cm 30 cm
Neutralization interval 1 second 3 seconds 10 seconds
□ If the IR switch is kept at ON after neutralizing, the ionizer indicates a warning by blinking the
LED.
□ When the neutralization interval is set to “manual”, the ionizer can only be controlled externally.
The “manual” neutralization interval is up to 10 minutes.
LED
ION mark
IR (touchless) switch

6
1.5. Controlling the Ionizer Externally
By using the foot switch (AX-SW137-PRINT or AX-SW137-REZERO), PRINT or RE-ZERO or the
neutralization function for the ionizer can be operated.
□ Connect the foot switch to the external input connector.
□ By selecting “Functions for the external connector ( )” or “Functions for the external
connector ( )” for “Neutralization function ( )” in the balance’s function settings,
key functions can be assigned to the terminal for the AX-SW137-PRINT (sold separately) or
AX-SW137-REZERO (sold separately).
□ Press the foot switch while the ionizer is operated to stop neutralization.
When theAX-SW137-PRINT is connected to the balance
Class Item Parameter Details and usage
0 ION key Assigns a key for starting neutralization to the
AX-SW137-PRINT.
(The IR switch at the ionizer becomes unavailable.)
1 PRINT key Assigns the function of the balance’s PRINT key.
When theAX-SW137-REZERO is connected to the balance
Class Item Parameter Details and usage
0 ION key Assigns a key for starting neutralization to the
AX-SW137-REZERO.
(The IR switch at the ionizer becomes unavailable.)
1 RE-ZERO key Assigns the function of the balance’s RE-ZERO key.
・indicates factory settings.
□ The connector for the IR switch cannot be used with the GXA-25.
External input connector Connector for the ionizer
・
・
Connector for IR
(touchless) switch

7
２．Function Settings of the Balance
The function table stores parameters that specify how to operate the balance, and it is used to
mointor or update those parameters. These parameters are stored in memory even if the AC adaptor
is removed and are retained until overwritten. Balance operations are specified by this table when
using the GXA-25. The table menu consists of two layers as shown in the diagram below. The first
layer is the “Class” and the second layer is the “Item”. Each item stores a "parameter". The last
displayed parameter is in effect. After the PRINT key is pressed, these updated parameters are
applied to operations of the balance.
Example of settings and menu structure 「データメモリ機能」を「計
「インターバル時間」を「１分毎」に設定する例。
Note: There are cases when operations cannot be made properly depending on settings and use conditions
(use environment). Carefully confirm the contents to be changed before changing them.
2.1. Display for function settings and operation keys
The 〇indicates that the parameter displayed is in effect.
Enters the function table when pressed and held in the weighing mode.
Selects the class or item in the function table.
Changes the parameter.
Moves to an item in the class when a class is displayed.
Stores the new parameter and displays the next class when an item is displayed.
Cancels new parameter and displays the next class when an item is displayed.
Exits the function table and returns to the weighing mode when a class is displayed.
The following example is when “External input connecto
r
(AX-SW137-REZERO)” is set to the ION key.
ion fnc
lon 3
Press
twice Press one time
exrR
C5in
Items
“Functions for the external inpu
t
connector”
Parameters
Items
Ends and enters
weighing mode
Starts and enters
weighing mode
Press and
hold
Press
several
times
Class

8
2.2. Items List
Note: Functions available differ by model of the balance.
Class Item
Parameter Description
ba5fnc
Environment,
display
CladjJ
Clock adjustment
Cp fnc
Comparator
Comparator
value
Cp beepEEP
Comparator
buzzer
dout
Data output
5if
Serial interface
U5b
USB interface
ap fnc
Application
Minimum weighing
warning function
Unit
Unit
d5 fnc
Specific gravity
measuring
function
id
ID number setting
Password locking
auto Cal*
Auto calibration
(Refer to balance’s instruction manual.)
0 1 second
1 3 seconds
2 10 seconds
ion
Neutralization interval
3 Manual for up to 10 minutes (Only external control
is enabled. The ionizer’s IR switch is disabled.)
0 ION key (The ionizer’s IR switch is disabled.)
Functions for the
external input connector
・1 PRINT key
0 ION key (The ionizer’s IR switch is disabled.)
ion fnc
Static eliminator
Functions for the
external input connector
・1 RE-ZERO key
C5in*
Correction for internal weight value (Refer to balance’s instruction manual.)
* Applies only to GX-A series. ・indicates factory settings.
・

9
3. Maintenance of the Electrode Unit
In general, when using the ionizer 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.
2 Replace all two units with new ones at the same time.
Note
Do not remove and clean the electrodes while the mark and the LED are flashing.
4．Specifications
Static elimination method DC corona discharge (Bipolar)
Elimination range Approx. 10 cm to 30 cm from the electrode
Elimination performance 1 sec. (at a distance ofapprox.10 cm and4kV electrical charge)
Ambient temperature and
humidity 5 to 45 ℃, 85％RH or less (No condensation)
Electrode Tungsten (life time of approx. 10,000 hours)
Mass Approx. 280 g (including the stand)
5．Option
Electrode Unit of the DC Static Eliminator AX-BM-NEEDLESET (4 pieces)
Use these electrode units for replacement parts of the
DC static eliminator built into the ionizer.
Replace all two units with new ones at the same time.
Refer to "3. Maintenance of the Electrode Unit " for the
replacement.
Electrode unit
Step 1
Step 2
Cleaning
Electrode

MEMO

MEMO

MEMO

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