KYOWA WGI-400A User manual

IM-A-683C April 2022
INSTRUMENTATION AMPLIFIER
With
MULTIPURPOSE INDICATOR
WGI-400A
INSTRUCTION MANUAL
Thank you for purchasing KYOWA’s product WGI-400A
Instrumentation Amplifier with Multipurpose Indicator.
Read this Instruction Manual carefully in order to make full use of the
high performance capabilities of the product.
Do not use the product in methods other than described in this Manual.
Copyright © KYOWA ELECTRONIC INSTRUMENTS CO., LTD. All rights reserved.
This Instruction Manual may not be copied or reproduced, in whole or part, without consent of KYOWA.
The Manual has been complied with great care. However, if the need should arise for more information, contact
KYOWA or our representatives.
The contents of the Manual are subjected to change without prior notice.

CONTENTS
SAFETY PRECAUTIONS ......................................................................................................................................1
PRIOR TO USE .................................................................................................................................................................................1
SAFETY SYMBOLS .........................................................................................................................................................................1
PRINCIPAL FUNCTIONS......................................................................................................................................4
STANDARD ACCESSORIES .................................................................................................................................4
TYPES .......................................................................................................................................................................5
1. PARTS NAMES AND FUNCTIONS ..................................................................................................................6
1-1 FRONT PANEL...........................................................................................................................................................................6
1-2 REAR PANEL..............................................................................................................................................................................7
2. CONNECTION.....................................................................................................................................................8
2-1 INSTALLING TO THE PANEL ................................................................................................................................................8
2-2 WIRING.......................................................................................................................................................................................9
2-2-1 Terminal Board ..................................................................................................................................................................9
2-2-2 Connecting Power Supply .................................................................................................................................................9
2-2-3 Connecting Transducers ....................................................................................................................................................9
2-2-4 Connecting Control Input Terminal ...............................................................................................................................10
2-2-5 Connecting Control Output Terminal ............................................................................................................................10
2-2-6 Connecting Analog Output Terminal .............................................................................................................................10
2-2-7 Connecting BCD Output .................................................................................................................................................10
2-2-8 Connecting RS Output.....................................................................................................................................................10
3. OPERATION AND FUNCTION.......................................................................................................................11
3-1 SETTING LOCK STATE .........................................................................................................................................................11
3-2 SELECTING BRIDGE EXCITATION VOLTAGE ...............................................................................................................11
3-3 DIGITAL ZERO FUNCTION..................................................................................................................................................12
3-4 CALIBRATION FUNCTION ..................................................................................................................................................13
3-4-1 Actual Load Calibration ..................................................................................................................................................13
3-4-2 Sensitivity Registering Calibration Function.................................................................................................................14
3-4-3 Numeric Value Registering Calibration .........................................................................................................................15
3-5 COMPARATOR FUNCTION ..................................................................................................................................................16
3-5-1 High/Low Limit Comparator Function..........................................................................................................................16
3-6 PATTERN FUNCTION ............................................................................................................................................................17
3-7 LEVEL TEST FUNCTION ......................................................................................................................................................17
3-8 TEDS FUNCTION ....................................................................................................................................................................18
3-9 FUNCTION SELECTING MODE (FUNCTION MODE) ....................................................................................................19
3-9-1 Selecting Function ............................................................................................................................................................19
3-9-2 Key Operation in Setting Mode ......................................................................................................................................19
3-9-3 List of Functions...............................................................................................................................................................20
3-10 ERROR CODE TABLE..........................................................................................................................................................25
4. OPERATION TIMING......................................................................................................................................26
4-1 CONTROL INPUT (ZERO, LEVEL TEST, PATTERN SELECT 1, & PATTERN SELECT 2 COMMANDS)..............26
4-2 HIGH/LOW COMPARATOR OUTPUT ................................................................................................................................26
4-3 DELAY TIME BETWEEN INPUT AND OUTPUT SIGNALS.............................................................................................27
5. SPECIFICATIONS ............................................................................................................................................28
5-1 SPECIFICATIONS ...................................................................................................................................................................28
5-3 OUTSIDE DRAWING ..............................................................................................................................................................30

1
SAFETY PRECAUTIONS
PRIOR TO USE
This Instruction Manual describes detailed instructions for operating the WGI-400A Instrumentation Amplifier
with Multipurpose Indicator (hereinafter referred to as the WGI-400A).
For safe use of the WGI-400A, do not forget to read the “Safety Precautions” prior to use.
KYOWA ELECTRONIC INSTRUMENTS CO., LTD. assumes no liability for any damages resulting from
user’s failure to comply with the safety precautions.
SAFETY SYMBOLS
For safety operation of the WGI-400A, the following “WARNING” and “CAUTION” symbols are used in
“Safety Precautions” of this Instruction Manual.
WARN ING
Improper operation of the system may result in death or severe injury of the
operator.
CAUTION
Improper operation of the system may result in injury of the operator and
physical damage of the system.
In addition, items in CAUTION may lead to serious consequences. Take special attention to the
Safety Symbols.
The following symbols are used in the WGI-400A to call operator’s attention when operating the product.
Safety Symbols used in the WGI-400A.
WARNING
Indicates “Handling Precautions.” This symbol is attached to the WGI-400A
when it requires to refer to the Instruction Manual for securing safety of the
operator and the product.
CAUTION
Indicates “Protective Ground Terminal.” Always connect to ground before
operating the product.

2
WARNING
●If the potential secondary damage generates in the System due to deterioration of the WGI-400A, always
adopt another proper technical measures for safety.
Or, trouble may occur caused by erroneous output or malfunction of the instrument.
●Installation and wiring work should be conducted more than 3 seconds after the power is cutoff.
Or, electric shock hazard or damage of the product may result.
●Do not forget to put a cover on the terminal board.
Or, electric shock hazard may result.
●Special care should be taken not to use the WGI-400A in environment with inflammable gas or vapor.
Or, fire hazard may result.
●If the WGI-400A is faulty, emitting smoke or offensive odor, or producing abnormal sound, immediately
turn OFF the power.
Or, electric shock or fire hazard may result.
Contact KYOWA’s representatives for repair.
●Do not put water or foreign matters into the WGI-400A. In case if any foreign matters are entered,
immediately turn OFF the power.
Or, electric shock or fire hazard may result.
Contact KYOWA’s representatives for repair.
●If the power cable is damaged, turn OFF the power and replace the cable with a new one.
Or, electric shock or fire hazard may result.
●Always operate the WGI-400A with power voltage specified in this Instruction Manual.
Or, electric shock or fire hazard may result.
●Do not operate the WGI-400A in environment with excessive moisture, dust or oil dust.
Or, electric shock or fire hazard may result.
●Do not disassemble the WGI-400A.
Or, deterioration or malfunction of the instrument may result.
●When it started thundering, do not touch the WGI-400A or cables.
Or, electric shock hazard may result.
●Always connect the protective ground wire to the protective ground terminal.
Or, electric shock hazard or malfunction of the instrument may result.
●In order to assuredly and immediately cut off the power when failure occurred in the system or in
WGI-400A, mount an external breaker, etc.

3
CAUTION
●Before wiring, always confirm the rated power voltage of the WGI-400A and terminal arrangement.
Then, conduct wiring in the correct manner.
●Power consumption of the WGI-400A is maximum 6 VA. If it is unavoidably operated in environment
with poor power condition, it is recommended to use an insulated constant voltage transformer or the
like.
●Special care should be taken when using the WGI-400A in environment with excessive vibration. If the
WGI-400A is operated at a location with excessive vibration or with continuous vibration, it may cause
measurement error and/or failure of the instrument.
Take care not to drop it during transportation and avoid applying strong impact.
Or, deterioration of the instrument may result.
●Basically, the WGI-400A is designed to be used by connecting a strain gage transducer to the input
terminal. Do not use transducers other than the above or deterioration of the instrument may result.
●Before cleaning the panel, always turn OFF the WGI-400A and gently clean with a soft cloth. Do not use
paint thinner, benzine, acetone, kerosene or the like.
●Use the WGI-400A by conforming to operating environment specified in this Instruction Manual.
Or, malfunction and/or failure of the instrument may result.

4
The WGI-400A is an Instrumentation Amplifier with multipurpose indicator that measures and displays load,
weight, pressure, displacement, etc. in physical values by connecting to various strain gage transducers such as
load cells, pressure meters, displacement meters, etc.
PRINCIPAL FUNCTIONS
• Calibration Function
Calibration values of transducers (sensors) are registered to display load, pressure, etc. in physical values.
There are 3 calibration functions such as actual load calibration, sensitivity registering calibration, and
numeric value registering calibration.
• TEDS (Transducer Electronic Data Sheet) (hereinafter referred to as the TEDS) Function
With calibration data obtained by TEDS compatible transducers, sensitivity is automatically registered.
• High/Low Limit Comparator Function
The indicated value is compared with the preset high/low limit values and the compared results are
externally output as well as indicated on LEDs.
• Pattern Select Function
Four sets of high/low limit values are stored and selected from the external signal.
• Analog Output Adjusting Function
Capable of adjusting voltage output that is proportional to the indicated value.
• Smoothing Function
The number of moving average times and minimum scale are set to decrease unstable indication.
• Auto Zero Compensation Function
Conduct Zero tracking and zero near zero function to stable the Zero display.
• Level Test Function
Displays arbitrary value to adjust the externally connected devices with ease.
• Optional Function
Various optional functions such as RS-232C, RS-485, and BCD output functions are provided so as to be
easily connected to an external indicator, printer, sequencer, PC, etc.
STANDARD ACCESSORIES
The following accessories are enclosed with the WGI-400A. After unpacking, check all the accessories are
correctly prepared.
Unit seal .......................................................................................... 1
Product Warranty ............................................................................. 1
Instruction Manual .......................................................................... 1
Installation & Setup Manual ........................................................... 1
Reference: Power cable is not included in the accessories. Customers are required to purchase the power cable
compatible for your power supply specifications.
Optionals: AC power cable for 100 VAC: P-23
AC power cable for 200 VAC: P-28

5
TYPES
The WGI-400A has the following types according to optional functions.
Model Name No Optionals BCD Output RS-232C RS-485 AC Power Supply DC Power Supply
WGI-400A-00 ○○
WGI-400A-01 ○○
WGI-400A-02 ○○
WGI-400A-03 ○○
WGI-400A-10 ○○
WGI-400A-11 ○○
WGI-400A-12 ○○
WGI-400A-13 ○○

6
1. PARTS NAMES AND FUNCTIONS
1-1 FRONT PANEL
1) Indicator ........................................• Displays a measured value, various selected functions, and set values.
• Normally, it is displayed with the measured value responding to the
output from transducers. However, if error occurs, error message
appears.
See “3-10 ERROR CODE TABLE.”
2) Unit Label .....................................• Select the desired unit from the accessory unit label sheet and attach it
on this portion.
3) [LOCK] LED ................................• When this [LOCK] LED is lit or flickering, no functions are set.
Always turn OFF the [LOCK] LED before setting functions.
• However, high/low limit value is displayed even when the [LOCK]
LED lit.
4) [HIGH] Limit LED .......................• Lights up when the measured value exceeds the high limit value.
• Flickers when the high limit value is displayed.
5) [OK] LED .....................................• Flickers when the measured value exceeds the low limit value or
lowers the high limit value.
6) [LOW] Limit LED ........................• Lights up when the measured value is less than the low limit value.
Flickers when the low limit value is displayed.
7) Operation Key ................................• A pushbutton switch to operate the WGI-400A.
One key is used together for multiple functions that are automatically
switched according to measuring or setting states.
8) Status Indicator...............................• In the measuring state, pattern No. is displayed.
• During calibration, minimum-digit numeric value of rated output is
displayed.
Note: The WGI-400A is not responding to the [HOLD] function.
1)
2)
3
)
4
)
5
)
6
)
7)
8
)

7
1-2 REAR PANEL
1) Optional Function: Location of connectors of BCD, RS232C, and RS485
2) Connection Terminals of Transducers (Transducer and TEDS)
A: Bridge excitation (+) Red wire
B: Bridge output (-) White wire
C: Bridge excitation (-) Black wire
D: Bridge output (+) Green wire
E : Shield
+ : TEDS (+)
- : TEDS (-)
3) Analog Output Terminal (ANALOG OUT)
COM : Common
V: Voltage output terminal
I: Current output terminal
4) Control Output Terminal (OUTPUT) 5) Control Input Terminal (INPUT)
COM: Common COM: Common
1 : High limit output (HIGH) 1 : Digital Zero command
2 : OK output (OK) 2 : Level test command
3 : Low limit output (LOW) 3 : Pattern select command 1
4 : Pattern select command 2
6) Power Input Terminal (POWER)
GND: Ground terminal .
N: Power supply input terminal
L : Power supply input terminal
+ : +Power supply input terminal
- : -Power supply input terminal
7) Fitting Metal Used for fixing the WGI-400A to the panel.
1)
2
)
3
)
4)
Ｖ Ｉ A B C D Ｅ + -
Ｎ Ｌ １ ２ ３
Ｇ
Ｎ
Ｄ
Ｃ
Ｏ
Ｍ
Ｃ
Ｏ
Ｍ
Ｃ
Ｏ
Ｍ
１ ２ ３ ４
6)
（＋ －）
5)
7
)
7)
KYOWA’s standard wire colors
Connect AC power supply.
Connect DC power supply. (When DC is optionally set.)

8
2. CONNECTION
2-1 INSTALLING TO THE PANEL
To install the WGI-400A to the panel, prepare a panel
according to the specified panel cut dimensions as shown
at the right. Then, install theWGI-400A by referring to the
following procedures.
1) Cut out the panel by referring to the panel cut dimensions.
2) Remove screws of the fitting metals attached on
both sides of the WGI-400A and then, pull out the
fitting metal.
3) Set the WGI-400A into the panel frame.
4) Set the fitting metals on both sides of the
WGI-400A.
5) Tighten the screws and firmly fix the WGI-400A.
92.2+0.4
-0
45.2+0.4
Plate thickness: 0.8 to 5.0 mm
-0
120
70
Panel cut position for mounting multiple WGI-400A units.

9
2-2 WIRING
Check terminal Nos. on the rear panel described on Page 7 and correctly wire the cables.
2-2-1 Terminal Board
• Remove the cover from the terminal board before conducting required wirings.
• It is recommended to attach press-fit terminals to the connecting wires.
Use the press fit terminals having the size equivalent to 1.25-3.
• After completing wirings to the terminal board, do not forget to put a cover on the terminal board.
2-2-2 Connecting Power Supply
• Do not forget to check that power voltage is from 100 to 240 VAC (±10%) and use the cable with pressure
proof capacity having more than power supply voltage.
• For DC power supply (Optional), check the DC voltage is from 10 to 30 VDC (8 W).
• Please use the power source reaching maximum voltage within 0.1 second after power on. With the power
source whose voltage rises up slowly, it may cause malfunction.
• If the power source is out of specifications such as over current or lower power capacity, the function of the
product fully stops for avoiding malfunction. The trouble is solved by turning off and leaving the product for
10 seconds. Before turning on again, please make sure if the power source is compatible.
Note: Although the WGI-400A may be operated with power supply voltage exceeding the
allowable power voltage range, the operation may not be guaranteed Always use the
WGI-400A within the specified power voltage range.
Note: Control input/output and analog output terminals has a tightening torque of 0.5 N･m or
less
2-2-3 Connecting Transducers
• Connect transducers to terminals A to E as described in the following.
(Cable colors are KYOWA’s standard color codes.)
A: Bridge excitation + side (Red)
B: Bridge output – side (White)
C: Bridge excitation - side (Black)
D: Bridge output + side (Green)
E: Shield
+: TEDS (+)
-: TEDS (-)
Note: Do not connect the power cable to the TEDS terminal.
• Use as short as possible 4-conductor shield cable (TEDS: 6-conductor cable) for transducer wiring.
In addition, locate the transducer far apart from power lines and wirings interfered with noise.
• Factory default of bridge excitation voltage is set to 2 V. It can be changed to 4 V. Set the voltage compatible
to transducer specifications (recommended excitation voltage) before using the transducer. See function
selecting mode ‘F-13’ and change the setting.
Note2: If the shield is connected to a case of a transducer, it could cause an electric shock.
Before connecting transducers, please check potential difference between transducer's
installation location and ground location. Please connect 'terminal E' and 'ground' if there is
potential difference.

10
2-2-4 Connecting Control Input Terminal
• Connection of control input terminal (INPUT)
is described in the following.
COM: Common
1: Digital command
2: Level test command
3: Pattern select command 1
4: Pattern select command 2
• When using the external switch, connect as shown in
the right figure. In addition, connect the open
collector in the same manner.
2-2-5 Connecting Control Output Terminal
• Connection of control output terminal (OUTPUT)
is described in the following.
COM: Common
1: High limit output (HIGH)
2: OK output (OK)
3: Low limit output (LOW)
• Connect by referring to the right figure.
2-2-6 Connecting Analog Output Terminal
• Connection of analog output terminal (ANALOG
OUTPUT) is described in the following.
COM: Common
V: Voltage output terminal (±10 V)
I: Current output terminal (4 to 20 mA)
• Always set the current output to load resistance 500 Ωor less and voltage output to 2 kΩor more.
Reference: Countermeasures against noise for control input/output and analog output terminals
• For more than 1-m long wiring, use twisted cable.
• For more than 3-m long wiring, use 2-conductor shield cable and connect the shield cable to the
ground terminal.
Note: Control input/output and analog output terminals has a tightening torque of 0.5 N･m or
less.
2-2-7 Connecting BCD Output
For connection of BDC output, see the WGI-400A Instruction Manual for Optional Functions.
2-2-8 Connecting RS Output
For connection of RS output, see the WGI-400A Instruction Manual for Optional Functions.
Input Connection Diagram
External
Internal
12V
Switch or open collector
2.4 KΩ
1 t
o
5
mA→
Out
p
ut Connection Dia
g
ra
m
30 Vmax
COM
External
Internal
10KΩ

11
3. OPERATION AND FUNCTION
This Chapter describes operation and various functions of the WGI-400A.
3-1 SETTING LOCK STATE
The setting [LOCK] function is used to prohibit the change in set values in order to prevent erroneous operation.
In the [LOCK] state, changing functions or high/low limit values are not allowed. However, the preset high/low
limit values can be monitored (for checking).
Before changing functions or high/low limit values, do not forget to cancel the [LOCK] state.
• Power ON and the WGI-400A starts up in measuring state with [LOCK] LED turned ON/ OFF depending on
the state before turning OFF the power.
• After changing the desired settings, press the [LOCK] button to be in [LOCK] state to prevent erroneous
operation.
How to set and cancel the [LOCK] state are described in the following.
Press the HOLD + FUNCTION keys for 2 seconds at the same time.
When the [LOCK] state is ON: Cancels the [LOCK] state ([LOCK] LED lights out)
When the [LOCK] state is OFF: Sets the [LOCK] state ([LOCK] LED lights up.)
Reference: However, even if it is in the [LOCK] state, the external control input terminal (INPUT) operates.
3-2 SELECTING BRIDGE EXCITATION VOLTAGE
Bridge excitation voltage (Excitation voltage) applied to transducers can be selected from either 2 V or 4 V.
Select the higher voltage within the recommended excitation voltage range of transducers. Factory default
setting is 2 V.
1) Changing to BV select mode.
Press the FUNCTION key for more than 2 seconds. ‘F-01’ is displayed to be in function selecting mode.
Press the →key until ‘F-13’ appears and then, press the SET key.
Bridge excitation voltage selecting function is set.
2) Selecting BV Voltage
The current selected BV No. appears and flickers.
Press the ↑key to change the setting (0: BV 2 V, 1: BV 4 V).
And then, press the SET key.
3) End
Function ‘F-13’ is displayed. Press the CANCEL key. Then, the registered bridge excitation voltage is
applied to the transducer.

12
3-3 DIGITAL ZERO FUNCTION
Digital Zero function serves to define the reference point of the indicator.
It is as same setting the scale pointer to ‘0.’
There are 2 methods for defining the reference point (Zero); by key operation and by contact input terminal
from the rear panel.
1) Key Operation
Press the ZERO key in the measuring mode for 2 seconds and the digital Zero function is activated to set the
indication to ‘0.’ If the additional value is set, the determined additional value is displayed.
2) Operation From the Rear Panel
• Short-circuit between rear terminals (INPUT) COM and No. 1 (Zero) to conduct digital Zero function.
This function is available when the [LOCK] LED is ON.
• When external control input terminals are set to OFF, the WGI-400A shall be in measuring state after
conducting the digital Zero function.
• Values adjusted by the above terminals shall be maintained even after the power is cutoff.

13
3-4 CALIBRATION FUNCTION
There are 3 calibration functions appropriate for the required purpose, that is, ‘Actual load calibration’ that
calibrates data by applying already known load to transducers (sensors), ‘Sensitivity registering calibration’ that
conducts calibration by registering a sensitivity value written in the transducer inspection report, and ‘Numeric
value registering calibration’ that calibrates data by registering input value to display Zero.
3-4-1 Actual Load Calibration
Actual load calibration is conducted by applying the actual load (already known load such as weight) to a
transducer.
Use a load cell having ‘rated capacity: 1 kHz’ and ‘rated output: 2.004 mV/V.’ An example shall be explained to
have the indicator display ‘100.0’ when 100-kg load is applied.
1) Conducting Digital Zero
Set the transducer to no load state. Press the ZERO key to activate the digital Zero function and to set the
indication to ‘0.’ Do not forget to conduct this digital Zero function to register the reference point.
2) Applying Actual Load
Apply the actual load to the transducer.
<Example> Gently apply 100 kg load.
3) Changing to Sensitivity Registering Calibration Mode
Press the FUNCTION key for more than 2 seconds. Function ‘F-01’ is displayed to be in function selecting
mode.
Press the →key to have the indicator display ‘F-02’ and press the SET key.
Then, the actual load calibration is set.
4) Setting Indicated Value
The currently set indicated value (Rated capacity) is displayed and the highest-order digit flickers.
Press the →or ↑key to set the set the desired value (Actual load value) by ignoring the decimal point.
<Example> Set the indicated value to ‘1000’ and press the SET key.
5) Setting Decimal Point Position
The current decimal point position flickers.
Press the →key and move the decimal point position.
<Example> Set the indicated value to ‘100.0’ and press the SET key.
6) Calibration End
Function ‘F-02’ is displayed. Press the CANCEL key.
Then, the measurement starts with the registered calibration value.

14
Reference 1: When setting the rated output, etc. the Status Indicator operates as the minimum digit
indicator.
Reference 2: Assume weight is measured with a load cell. Since notation of the load cell rated capacity
is Newton [N], the rated capacity is converted into weight unit [kg].
Ratedcapacity[N]
Rated capacity [kg] =
Gravity acceleration [m/s2] of the location in use
3-4-2 Sensitivity Registering Calibration Function
This is a function that calibrates data by registering rated output of a transducer without applying the actual
load.
Use a transducer having ‘rated capacity: 1 kHz’ and ‘rated output: 2.004 mV/V.’ An example shall be explained
to have the indicator display ‘1.000’ when 1-kN load is applied.
1) Conducting Digital Zero
Set the transducer to no load state Press the ZERO key to conduct the digital Zero function and to set the
indication to ‘0.’
2) Changing to Sensitivity Registering Calibration Mode
Press the FUNCTION key more than 2 seconds. Function ‘F-01’ is displayed to be in function selecting
mode.
Press the →key to have the indicator display ‘F-03 and press the SET key.
Then, the sensitivity registering calibration is set.
3) Setting Rated Output of the Transducer
The currently set rated output value is displayed and the highest-order digit flickers.
Press the →or ↑key to set the rated output of the transducer in ‘mV/V’ unit.
<Example> Set the indicated value to ‘2.0040’ and press the SET key.
At this time, the Status Indicator operates as the minimum digit indicator.
4) Setting Indicated Value
The currently set display rated capacity is displayed and the highest-order digit flickers.
Press the →or ↑key to set the rated capacity of the transducer by ignoring the decimal point.
<Example> Set the indicated value to ‘1000’ and press the SET key.
5) Setting Decimal Point Position
The current decimal point position flickers.
<Example> Set the indicated value to ‘100.0’ and press the SET key.
6) Calibration End
Function ‘F-03’ is displayed. Press the CANCEL key.
Then, the measurement starts with the registered calibration value.

15
Note: Numeric value registering calibration is erased when conducting the actual load calibration and
sensitivity registering calibration.
Reference: Although, the rated output of strain gage transducers is generally expressed in [mV/V], it may
be expressed in other units. At that time, the obtained data is converted into other units.
1 [mV/V] = 1000 [μV/V] = 2000 [×10-6 strain] = 2000 [με] = 2000 [μm/m]
3-4-3 Numeric Value Registering Calibration
This is a function that calibrates data by setting the indicated value to a reference (Initial) value. Conduct this
function after the actual load and sensitivity registering calibrations.
This function is used for pressure transducers for absolute pressure measurement or when already load is
applied and unable to obtain the actual load state. By registering the initial value of the transducer written in the
inspection report or registering an already measured initial value, a reference point equivalent to unload state
can be registered.
1) Changing to Sensitivity Registering Calibration Mode
Press the FUNCTION key more than 2 seconds. Function ‘F-01’ is displayed to be in function selecting
mode.
Press the →key to have the indicator display ‘F-04’ and press the SET key.
Then, the numeric value registering calibration is set.
2) Setting Initial Value of the Transducer
The currently set reference value is displayed and the highest-order digit flickers.
Press the →or ↑key to set the set the initial value of the transducer in mV/V unit.
After numeric value is determined, press the SET key.
At this time, the Status Indicator operates as the minimum digit indicator.
3) Calibration End
Function ‘F-04’ is displayed. Press the CANCEL key.
Then, the measurement starts with the registered calibration value.

16
3-5 COMPARATOR FUNCTION
3-5-1 High/Low Limit Comparator Function
High/low limit comparator function is a function that compares the indicated value with the high/low limit value
and outputs the compared result. The result of comparison is obtained as open collector output from the rear
terminal board and is indicated on the [HIGH]/[OK]/[LOW] LEDs on the front panel. The hysteresis (Dead
zone) can be set in the set value.
1) Output and LED Display to High/Low Limit Comparison Conditions
• Regarding high limit comparator (HIGH), when the indicated value exceeds the higher limit value, the
higher limit output becomes ON.
On the contrary, when the indicated value lowers the ‘higher limit value - hysteresis value,’ the higher
limit output becomes OFF.
• Regarding low limit comparator (LOW), when the indicated value lowers the lower limit value, the lower
limit output becomes ON.
On the contrary, when the value exceeds the ‘lower limit value + hysteresis value,’ the lower limit output
becomes OFF.
For details, see the following figure.
2) Setting High/Low Limit
(1) Press the HIGH (or LOW)key for 2 seconds in the measuring mode. The current set value is indicated
and the highest order digit flickers.
At this time, the [HIGH] (or [LOW]) LED flickers.
(2) Select and move the flickering to the desired digit with the →key and change the numeric value with
the ↑key.
(3) Then, press the SET key to determine the setting.
3) Setting Hysteresis
Set hysteresis width that turns OFF the once turned ON high/low comparator.
The hysteresis can be separately set for high and low limit comparators.
For how set the hysteresis, see the function selecting mode ‘F-10.’
Hi
g
h limit
(
HIGH
)
Low limit (LOW)
Hi
g
h limit
(
HGH
)
ON
O
K
ON ON
ON
Low limit (LOW)
ON