A&D AD-4531B User manual

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1WMPD4002618B

WARNING DEFINITIONS
The warnings described in this manual have the following meanings:
A potentially hazardous situation which, if not avoided, could
result in death or serious injury.
A potentially hazardous situation which, if not avoided, may
result in minor or moderate injury or damage to the instrument.
This symbol indicates caution against electrical shock. Do not
touch the part where the symbol is placed.
This symbol indicates the ground terminal.
This symbol indicates information useful to the user for operation
of the device.
© 2014 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.

3
CONTENTS
1. INTRODUCTION .....................................................................................................5
1.1. Features ............................................................................................................................... 5
2. BEFORE USE .........................................................................................................6
2.1. Precautions before use ........................................................................................................ 6
2.2. Precautions during use ........................................................................................................ 6
3. SPECIFICATIONS...................................................................................................8
3.1. General specifications.......................................................................................................... 8
3.2. Functions.............................................................................................................................. 9
3.3. Options ............................................................................................................................... 10
4. FRONT PANEL......................................................................................................12
4.1. Display................................................................................................................................ 12
4.2. Status indicators................................................................................................................. 12
4.3. Keys.................................................................................................................................... 13
4.4. Operation mode.................................................................................................................. 13
5. REAR PANEL ........................................................................................................14
5.1. Connector function ............................................................................................................. 14
5.2. Equivalent circuit diagram of the control input section ...................................................... 16
5.3. Equivalent circuit diagram of the control output section .................................................... 17
5.4. Attaching the connector ..................................................................................................... 17
5.5. Load cell connection........................................................................................................... 18
6. COMPONENTS AND FUNCTIONS.......................................................................20
6.1. Flowchart ............................................................................................................................ 20
6.2. Descriptions of functions .................................................................................................... 21
7. CALIBRATION.......................................................................................................22
7.1. Calibration modes .............................................................................................................. 22
7.2. Calibration errors................................................................................................................ 24
8. FUNCTION MODE ................................................................................................25
8.1. Description of functions...................................................................................................... 25
8.2. Key operation ..................................................................................................................... 25
8.3. Function items .................................................................................................................... 27
9. DIGITAL ZERO (DZ)..............................................................................................32
9.1. Operating by key ................................................................................................................ 32
9.2. Operating by I/O input ........................................................................................................ 32
9.3. Zero tracking ...................................................................................................................... 32
9.4. Power on zero .................................................................................................................... 33
9.5. Backup of DZ...................................................................................................................... 33
10.HOLD FUNCTION .................................................................................................34
10.1. Basic function ................................................................................................................. 34

4
10.2. Hold indicator.................................................................................................................. 34
10.3. Priority of hold input........................................................................................................ 34
10.4. Values falling out of range during the hold function ....................................................... 35
10.5. Hold modes..................................................................................................................... 35
11. LATCH ...................................................................................................................37
12.COMPARATOR FUNCTION ..................................................................................38
12.1. Description of the comparator mode .............................................................................. 38
12.2. Setting the upper and lower limit values ........................................................................ 38
12.3. Example of the comparator mode .................................................................................. 39
12.4. Hysteresis ....................................................................................................................... 40
13.ANALOG OUTPUT................................................................................................43
13.1. Analog voltage DAV (0V to 10V) .................................................................................... 43
13.2. Analog current DAI (4mA to 20mA) ................................................................................ 43
14.SERIAL INPUT AND OUTPUT ..............................................................................44
14.1. Data output format.......................................................................................................... 44
14.2. Command and response ................................................................................................ 45
15.MAINTENANCE ....................................................................................................47
15.1. Error display.................................................................................................................... 47
15.2. Checking operation......................................................................................................... 48
16.SETTING LIST ......................................................................................................53
16.1. Calibration (C function)................................................................................................... 53
16.2. Basic functions................................................................................................................ 54
16.3. Comparator..................................................................................................................... 55
16.4. Analog output.................................................................................................................. 55
16.5. Serial communication ..................................................................................................... 56
16.6. Unit.................................................................................................................................. 57
17.EXTERNAL DIMENSIONS ....................................................................................58

5
1. INTRODUCTION
Thank you for purchasing the AD-4531B Digital Indicator.
This manual describes how the AD-4531B works and how to get the most out of it in
terms of performance. Please read this manual completely before using the AD-4531B.
1.1. Features
The AD-4531B has the following features.
Calibration without an actual load (Digital span mode)
Keying in the sensor’s rated output voltage (mV/V) allows calibration to be performed
without using an actual load.
Digital filter
The selection range of the cutoff frequency is 11 Hz to 0.7 Hz or none.
Digital zero (DZ, zero adjustment)
The digital zero function sets a desired measurement point as zero and displays the
deviation from this zero point. When weighing a load, it can be used as the tare, etc.
The zero value is saved in non-volatile memory (EEPROM) and is maintained even if
the power is disconnected. Memory backup of 10,000,000 or more times is available.
Zero tracking function
The zero tracking function updates the zero point automatically by sensing the zero
point drift.
Hold function
Sample, peak, bottom and bipolar peak values can be held using the hold mode.
Comparator function
Comparison results (HI, OK and LO) are displayed by the LEDs and output as contact
signals.
Chattering of the output can be prevented by setting hysteresis.
Various data output terminals
Available options are comparator output, serial interface (RS-232C/RS-485), analog
voltage output (DAV) and analog current output (DAI).

6
2. BEFORE USE
The digital indicator is a precision instrument. Unpack the digital indicator carefully and
confirm that all items are present.
2.1. Precautions before use
Avoid water and moisture.
Avoid vibration, shock, extremely high temperature and humidity, direct sunlight, dust
and air containing salt or sulfurous gases.
Avoid places where inflammable gases or vapors are present.
The operating temperature range is -10°C to +40°C.
A 100 VAC to 240 VAC power source is required. Use a stable power supply free
from sudden dropout or noise as they can cause malfunctions. Avoid sharing the
power line.
Keep cables away from power cables and other sources of electrical noise.
Connect only a non-inductive load of 10 kΩ or more to the analog voltage output
terminals.
Connect only a non-inductive load of 510 Ω or less to the analog current output
terminals.
When connecting long cables to the sensors, keep the cables away from power
cables and other sources of electrical noise.
Do not connect the AD-4531B to the power supply before installation is completed.
The AD-4531B has no switch to disconnect the power supply.
Use shielded load cell cables.
Do not connect too many sensors. Otherwise, instrument damage may occur.
2.2. Precautions during use
The AD-4531B is a precision instrument that measures the microvolt output from
sensors. Prevent noise sources such as power lines, radios, electric welders or
motors from affecting the instrument.
Do not try to modify the AD-4531B.
In all hold modes, the hold data is saved digitally, so there is no drooping of the value
displayed on the display panel or the analog output. Note that the hold function is
disabled when the AD-4531B is disconnected from the power supply.

7
Disconnect from the power supply before removing the cover.
When removing the cover, make sure that the power is disconnected.
Do not touch the instrument immediately after it is disconnected from the power
supply.
To avoid electrical shock, do not touch the internal part of the instrument
within ten seconds after disconnecting from the power supply.
Be sure to fasten all the screws completely.
Loose screws may come off during operation and a short circuit may occur or
measurement errors may occur due to noise.

8
3. SPECIFICATIONS
3.1. General specifications
Number of measurement points 1
Sensor type Strain gauge sensors (Output resistance: 10k Ω or less)
Voltage requirement 100 VAC to 240 VAC (50/60 Hz)
Power requirement Approx. 10 VA
Sensor power supply 5 VDC±5%, 50 mA
120 Ωsensor: Up to one sensor can be connected.
350 Ωsensor: Up to three sensors can be connected.
Measurement ranges Span adjustment range: -35 to +35 mV (-7 to +7
mV/V)
Zero point adjustment range: -35 to +35 mV (-7 to +7
mV/V)
Minimum guaranteed input sensitivity: 0.15 µV/d or
more (d = minimum division)
Minimum displayed input sensitivity: Non-limit
A/D conversion method Delta sigma method
Internal division Approx. 16,000,000 counts
Sampling rate 100 times / second
Display range -999999 to +999999
Linearity Within 0.005%F.S. ± 1 digit
Temperature coefficient Zero drift: ±0.1 µV/°C typ.
Span drift: ±8 ppm/°C typ.
Operating temperature -10 °C to +40 °C
Operating humidity Max. 85% RH (no condensation)
Calibration method Digital span: Method not using an actual load
Actual load calibration
External dimensions 96 x 48 x 127.5 mm (W x H x D)
Panel cutout: 92 x 45 mm
Spacing: Width: 120 mm or more
Length: 70 mm or more
Weight Approx. 290 g
Display panel Measured value display:
7-segment, 6-digit red LED screen with 9.2-mm
character size
Polarity display: 1 red LED screen
Status displays:
1 red LED screen, 2 green LED screens, 2 orange
LED screens
Key switch: 5 switches
Accessories Power connector (2 pins)
Load cell connector (7 pins)
Control input/output connector (6 pins)

9
3.2. Functions
￭Digital zero (Zero adjustment)
Sets the measured value to zero using the ZERO key, external input or the command
signal.
The zero value is saved in non-volatile memory (EEPROM).
Available setting range
The available setting range is 1 to 100% of the rated capacity.
￭Zero tracking function
Automatically updates the zero point by sensing the zero point drift.
Available setting range
Tracking time :0.0 to 5.0 (second)
Tracking width :0.0 to 9.9 (d)
￭Power on zero function
Sets the zero state at power on.
￭Digital filter function
Cutoff frequency range: 0.7 to 11 (Hz)
￭Comparator function
HI, OK or LO is determined by setting the upper or lower limit value.
￭Hold function
Select from sample hold, peak hold, bottom hold, or bipolar peak hold.
￭Latch function
Perform latching of the displayed value, comparator output, analog output, serial
output, using the external LATCH input.
￭Relay output function (option)
Provides contact output of the HI, OK or LO signals.
￭Serial input and output function (option)
The RS-232C/RS-485 option can output measured values and input commands.
￭Analog output function (option)
Outputs the measured value as an analog voltage or current.

10
3.3. Options
3.3.1. Options
AD-4530-200: Relay output
AD-4530-030: RS-485
AD-4530-040: RS-232C
AD-4530-007: Analog output
AD-4530-237: Relay output, RS-485, Analog output
AD-4530-247: Relay output, RS-232C, Analog output
Note: Only one option can be installed in the AD-4531B at a time.
3.3.2. Option specifications
￭Relay output HI, OK, LO
AD4530-200 250 VAC or 30 VDC 3A (Total current 5A)
AD4530-237 Contact construction: Metallic contact
AD4530-247 Contact capability: 1a
Mechanical operating life: 5,000,000 times or more
Electrical operating life: 100,000 times or more (Resistive load)
4-pin connector included (HI, OK, LO, COM)
￭RS-485 Conforms to EIA RS-485
AD4530-030 Number of drops: Up to 31
AD4530-237 5-pin connector included (A, B, SG, A, B)
￭RS-232C Conforms to EIA RS-232C
AD4530-040 5-pin connector included (RxD, TxD, SG, IC, IC)
AD4530-247
￭Analog output D/A conversion method: PWM
AD4530-007 Resolution: Equivalent to 13 bits
AD4530-237 Response rate: Approx. 500 ms
AD4530-247 Voltage output: 0-10V Adaptive load: 10 kΩ min.
Current output: 4-20 mA Adaptive load: 510 Ωmax.
Non-linearity: ±0.1% typ.
Temperature coefficient: Zero point 100 ppm/OC typ.
3-pin connector included (VOU T, IOUT, COM)

11
3.3.3. Installing an option
1. Remove the two screws that secure the guide rail, and then remove the guide rail.
2. Remove the two screws that secure the case.
3. Pull the case out from the front panel (holding it as shown).
4. Remove unnecessary blank panels with nippers, etc.
5. Insert the option board at the position specified on the rear of the front panel.
6. Reattach the case and guide rail by reversing the steps above.
1
3
2
5
4
1
1
2
3
Guide rail
Case
Option board
Front panel
Blank panel

12
Display
Keys
1 2 3
4
5
4. FRONT PANEL
4.1. Display
Displays a measured or set value. To set the decimal point position, use the function
mode (Cf-01). The display is composed of six seven-segment LEDs plus a minus sign.
4.2. Status indicators
Name Description
1 HI Turns on when the measured value is greater than the upper limit
(HI).
2 OK Turns on when the measured value is equal to or greater than the
lower limit and equal to or less than the upper limit.
3
LO
Turns on when the measured value is less than the lower limit (LO).
4
DZ
Turns on when adjusting the zero value. (Digital zero)
5
HOLD
Turns on when a value is being held.

13
4.3. Keys
Operation
Function
Press to proceed to the upper limit value setting mode.
When inputting a numerical value, press to change the polarity.
Press to proceed to the lower limit value setting mode.
When inputting a numerical value, press to cancel the setting.
Press to turn the digital zero function on.
When inputting a numerical value, press to shift the position
of the blinking digit to the right or change the function group.
+
Press to turn the digital zero function off.
Press to turn the hold function on or off.
When inputting a numerical value, press to change the
blinking digit or change the function parameter.
Press to output the serial data (print).
When inputting a numerical value, press to enter the setting.
+
Press to proceed to the calibration mode.
+
Press to proceed to the function selection mode.
+ +
Press to proceed to the selection mode in the check mode.
* The digital zero function sets a desired measurement point as zero and displays the
deviation from this zero point. When weighing a load, it can be used as the tare, etc.
* The zero value is saved in non-volatile memory (EEPROM) and is maintained even
if the power is disconnected.
* To change the zero adjustment operation, use the function (Cf-11) .
To protect against accidental operation, press the + keys or press and
hold the key for more than 1 second to turn the digital zero function on.
4.4. Operation mode
- Upper / lower limit setting mode
Use this mode to set the upper and lower limit values of the comparator.
- Calibration mode
Use this mode to perform zero and span calibration with an actual load (calibration
weight).
- Function mode
Use this mode for setting functions.
- Check mode
Use this mode to confirm input and output operation.

14
5. REAR PANEL
Confirm the terminal numbers when making connections.
When making connections, confirm the terminal numbers printed on the
top of the indicator case.
5.1. Connector function
5.1.1 AC input connector
(1) AC Connect the AC power cord.
The power requirement is 100 VAC to 240 VAC, 50/60 Hz.
When making connections,
Switch off the power of all the instruments used.
Keep cables away from power cables and other sources of electrical
noise.
5.1.2 Load cell connector
(1) SHLD Connect the shielded cable of the sensor cable.
(2) SIG- Negative signal input terminal for the sensors
(3) SIG+ Positive signal input terminal for the sensors
(4) EXC- Negative excitation terminal for the sensors
(5) SEN- Negative sensing input terminal for the sensors
When performing the 4-wire connection, connect terminals 4 and 5
(EXC- and SEN-).
4 3 2 1
5 4 3 2 1
3 2 1
1
1 2 3 4 5 6 7 1 2 3 4 5 6
Relay output RS-232C／RS-485
Analog output
AC
Load cell Control input/output

15
(6) SEN+ Positive sensing input terminal for the sensors
When performing the 4-wire connection, connect terminals 7 and 6
(EXC+ and SEN+).
(7) EXC+ Positive excitation terminal for the sensors
5.1.3 Control input/output connector
(1) EXT IN 1 Control input terminal 1
(2) EXT IN 2 Control input terminal 2
(3) IN COM Control input common terminal
(4) EXT OUT 1 Control output terminal 1
(5) EXT OUT 2 Control output terminal 2
(6) OUT COM Control output common terminal
5.1.4 Relay output connector (Option)
(1) COM Relay output common terminal
(2) LO Relay LO output terminal
Outputs LO when the measured value is less than the lower limit.
(3) OK Relay OK output terminal
Outputs OK when the measured value is equal to or greater than the
lower limit and equal to or less than the upper limit.
(4) HI Relay HI output terminal
Outputs HI when the measured value is greater than the upper limit.
Comparator output
To prevent damage, do not exceed the rated capacities of the output
relays. To p rotect the output relays, use a varistor, CR circuits or diodes.
5.1.5 Serial communication connector (Option)
In the case of RS-232C:
(1) IC Internally connected (Do not use)
(2) IC Internally connected (Do not use)
(3) SG Signal ground terminal
(4) TxD Sending terminal
(5) RxD Receiving terminal
In the case of RS-485 (2-wire connection):
(1) B B terminal
(2) A A terminal
(3) SG Signal ground terminal
(4) B B terminal
(5) A A terminal

16
* Each of the A and B connections has two terminals.
These terminals are connected internally and can be used for a terminating resistor or
multi-drop connection.
5.1.6 Analog output connector (Option)
(1) COM Common terminal of the analog output
(2) IOUT Analog current output terminal
(3) VOUT Analog voltage output terminal
5.2. Equivalent circuit diagram of the control input section
When connecting the input terminal:
Select a switching element of the non-voltage input type, such as a
mechanical contact or semiconductor contact.
Use the leakage of the switching element, when OFF, of 30 μA or less
Toggle switch
Mechanical relay
contact
Semiconductor
contact
(Transistor open
collector)
TTL open co
llector output
+5V
3.3kΩ
200
Ω
AD-4531B inner side
0.1μF
Machine contact
(Switch)
Keep each ON and OFF time
for 100 ms or more.
Approx. 1.5mA
(1) EXT IN 1
(3) IN COM
* The circuit of (2) EXT IN 2 is the same as
the
circuit of (1) EXT IN 1.

17
5.3. Equivalent circuit diagram of the control output section
Output circuit
Open collector output
Output voltage 40 VDC
Output drive current
50 mA
Output saturation voltage 1.5 V
5.4. Attaching the connector
AC input and options connectors Load cell and control input/output connectors
Pitch: 5.08 mm Pitch: 3.50 mm
Wire size: 12 to 24 (AWG) Wire size: 16 to 28 (AWG)
Stripping length: 6 to 7 mm Stripping length: 6 to 7 mm
Tightening torque: 0.5 to 0.6 Nm Tightening torque: 0.2 Nm
* The circuit of (5) EXT OUT 2 is
the same as the
circuit of (4) EXT OUT 1.
AD
-4531B inner
+5V
(4) EXT OUT 1
(6) OUT COM
Connector
Connector
Flathead
screwdriver
Flathead
screwdriver

18
5.5. Load cell connection
Two types of load cell connection are available: 6-wire connection and 4-wire
connection.
For high precision and stable measurement, 6-wire connection is recommended.
6-wire connection
1 SHLD
2 SIG-
3 SIG+
4 EXC-
5SEN-
6 SEN+
7 EXC+
4-wire connection
1 SHLD
2 SIG-
3 SIG+
4 EXC-
5SEN-
6 SEN+
7 EXC+

19
Type Advantages Disadvantages Description
6-wire connection
(recommended)
The error is small
even when the load
cell cable is
extended,
a thin load
cell cable is used, or
multiple load cells
are used.
Complicated wiring
Use a 6-wire
shielded cable when
a summing box is
used.
4-wire connection Simple wiring
The influence of the
load cell cable
resistance worsens
the temperature
coefficient.
Prone to the
influence of the
contact resistance of
the connector
The error increases
when the load cell
cable is extended or
multiple load cells
are used.
Precautions on performing the 4-wire connection
Be sure to connect terminals 7 and 6 (EXC+ and SEN+) and terminals 5 and 4
(SEN- and EXC-).
If the cable needs extending, use a cable with as large a cross-sectional area as
possible or keep the cable as short as possible.

20
6. COMPONENTS AND FUNCTIONS
The following flowchart shows how the functions of the AD-4531B are executed.
6.1. Flowchart
Input from sensor
A/D conversion
Digital filter
Measured value
Hold
Comparator Relay output
Analog output
External input
Option
Latch
Comparator
indication
Key operation
Control
D/A conversion
Serial input
and output
Measured value
display
Display filter
(1 to 20 times / second)