RoHS

READ THE INSTRUCTION MANUAL BEFORE USINGINSTRUCTION MANUALMANOSTAR DIGITAL SENSOR
EMD8A□□6

No. TR-EMD8A□□6-E10

1-2-3,Nishishiriike-cho,Nagata-ku,Kobe,653-0031 JAPANTEL. +81-78-631-6000 FAX. +81-78-631-6020

TABLE OF CONTENTS

PAGE

INTRODUCTION .......................................................................................................................................................... 1
Ⅰ．PRECAUTIONS .................................................................................................................................................... 2
Ⅱ．SPECIFICATIONS
1. Outline drawing ................................................................................................................................................ 3
2. Function
2-1 Display function .................................................................................................................................... 4
2-2 Max. and min. value memory function.......................................................................................... 5
2-3 Function of comparison output ...................................................................................................... 5
2-4 Function of analog output ................................................................................................................ 6
2-5 Function of display low cut .............................................................................................................. 7
2-6 Function of sign reversal of display measured ........................................................................ 7
2-7 Function of low power consumption ............................................................................................ 7
2-8 Function of test mode ....................................................................................................................... 7
2-9 Function to clear set value .............................................................................................................. 7
2-10 Function of set value protecting ................................................................................................... 7
Ⅲ．INSTALLATION
1. Installation conditions................................................................................................................................. 10
2. Installation of instrument .......................................................................................................................... 10
3. Wiring ................................................................................................................................................................. 10
4. Piping
4-1 Measured pressure and connection of piping........................................................................ 13
4-2 Piping material .................................................................................................................................... 13
4-3 Caution of piping ............................................................................................................................... 14
Ⅳ．OPERATION
1. Before trial running...................................................................................................................................... 15
2. Operation panel ............................................................................................................................................. 15
3. How to operate
3-1 Change-over procedure of mode ............................................................................................... 15
3-2 Basic operation in each mode ..................................................................................................... 18
3-3 Operation of test mode .................................................................................................................. 19
3-4 Calibration for zero adjustment .................................................................................................. 19
4. If error happens ............................................................................................................................................ 20
Ⅴ．PRODUCT WARRANTY ................................................................................................................................. 21

INTRODUCTION
Thank you very much for purchasing of 「MANOSTAR DIGITAL SENSOR EMD8A」.

Features
・Compact size
This instrument is a compact digital micro differential pressure gage composed of the diaphragm type detection part and thealarming function part incorporated in 24 × 48 size.
・Employing an easy-to-see large seven segments LED
Red-colored seven segment LED, 12 mm high character of high visibility, is used for 3･1/2 digits.
・Comparison output provided for two channels
Function of giving alarm as output when unusually increased pressure is sensed. Moreover, many kinds of operation modes
can be set by selecting the alarming function. When ordering, the alarming output can select NPN or PNP open collector.
・Analog output provided
Function giving pressure value as analog output.
・Digitally-processed zero adjustment and comparator for alarm outputs
Built-in micro-computer digitizes and processes calibration for zero adjustment as well as comparator for alarm outputs.
・Simple operability
This machine, designed for dedicated to pressure measurement, has simple operation set menu.
・Low power consumption
The electric power consumption is reduced by lowering the display luminance of LED.
・Setting value protecting function
It prevents a setting value to mistake by incorrect operation.
・Test mode function
The confirmation of the comparison power output and the analog output when setting up and checking actually becomes
possible by setting simulative pressure as for the state that pressure is not applied.
・Max. and min. value memory function
Max and min. value of the measurement pressure are retained and it displays it. It is used for the reference value etc. in thecomparison output set point etc. when operating it.
・Function of sign reversal of display measured
・Function of analog output reversal
・Conformed to EU directive
This instrument has been tested according to EMC standard EN IEC 61326-1:2021, and test levels have been applied toqualify for operation in an industrial environment.
・UL recognized component△！

CautionTo ensure your safety in using this instrument:
・Be sure to read the instruction manual carefully before using this instrument so that you can use itproperly.
Wrong use may result in failure of this instrument and lead to its damage and accident. This manual should
be kept in a proper place so that you can refer to it any time you need.

1

Ⅰ． PRECAUTIONS△Warning！

・Do not use the instrument where flammable gas is present.
The instrument is not explosion-proof. Do not use instruments in the circumstance where flammable gas is present. It
may cause explosion.
・Do not use the instrument at the place where corrosive gas is present.
The instrument is not corrosion resistance construction. Measuring corrosive gas may corrode the receiving element
and housing material of the instrument. It is expected that corrosive gas leaked out of the instrument will harm aperson.
・Do not apply the pressure to the instrument more than it can withstand.
The diaphragm and the retainer are broken and cause of injury or accident, etc. disaster if the pressure exceeding
withstanding pressure of the pressure receiving element is applied to the instrument. The case body and thetransparent cover of the instrument are broken and cause of injury or accident, etc. disaster if the pressure exceeding
withstanding pressure of the instrument body is applied to the instrument.
・The instrument is measurable for air and non-corrosive gas only.
The machine is exclusive use of dry air (85%RH or less). Using measuring the water or oil it may be damaged andcauses the accident.
・Avoid using where instrument is exposed to many vibration and impact.
Using this instrument where intensified vibration and impact may be damaged instrument. It is expected that gas
leaks of instrument which harms a parson.
・Do not exceed rated voltage in using.
Using this instrument by exceeding rated voltage may cause fire or electric shock.
・Wire correctly.
Incorrect wiring may cause fire.
・Do not exceed rated surrounding temperature, humidity and altitude in use.
Using this instrument by exceeding rated surrounding temperature and humidity and altitude it may be damaged andcause the accident.
・Do not disassemble or reconstruct your instrument.
It may void your warranty.

△Caution！

・When pressing a push button, use your fingers.
Using hard or sharp pointed object to press the push button will cause scratches on the surface, its damage or failureof this instrument.
・As to where to install and how to install the instrument, be sure to follow the instruction manual provided so as toensure a proper method.
・Use the instrument indoors.
・In case of not being installed in dry and well-kept clean locations, the instrument must be enclosed in box.
・Electromagnetic emissions exceeding the requirements of the test standard can occur when the instrument isconnected to a test object.
・Keep away from the devices which generate strong electromagnetic field.
If the instrument installed in strong electromagnetic field, it may cause the drift of accuracy display to be max.4%FS.
・The power of this equipment shall be supplied with 12 to 24Vd.c. from a NEC Class 2 or Limited Power Source (LPS)
power supply.
・Do not use organic solvent for cleaning.
Use of organic solvent, such as thinner and benzene, to remove surface dirt and stain may cause melting and cracking
on the surface. To remove dirt and stain, be sure to wipe them off with a wet cloth using diluted neutral cleanser.
・Dropping the product.
Product is a precision instrument. If you drop the product, there is a possibility that the exterior, also the interiormechanism damage.
・Removal of the piping
If you replace the old pipes, please do not pull the pipe with a strong force. There is a possibility that the pipe cap isbroken.

2

Ⅱ． SPECIFICATIONS
1. Outline drawing
Fig.2-(1) EMD8A□□6outline drawing(72.5)
3.5

69

+0.5

45 0

１２３４５６22.2 0

+0.3

57.5

12
13

44.5

Cutout panel fig.

Name plate
48

φ4.5

Allowable thickness of panel 1～3mm

3

7.4

22

24

RITS Connector ６Ｐ
（ＣＮ１）
ＨＩＧＨ

ＬＯＷ

Connector
for low pressure
Connector
for high pressure2. Function
2-1 Display function1）Pressure display
A pressure sensor of this instrument is designed to measure differential pressure. When pressure on H side ishigher than L side, the pressure display indicates a positive value. After the moving average is processed byzero auto corrections after the signal from the sensor is converted in A/D and digitalizes, the pressure display
is displayed in seven segments LED.
2）Zero correction
Zero points of the this instrument are adjusted in zero adjustment set mode with pressure not impressed.
3）Moving average filter
The number of the moving average is set in the display filter setting mode. When the change of themeasurement pressure is large, the change of the display value can be reduced by enlarging the average numberof the moving average function. The response is late according to large a set value of the filter mode. The
comparison operation can be set to operate quickly though gradually displays because the moving average filterof this instrument can be individually set for the display and for the output. When the instrument is shippedfrom our factory, is set to standard "1.0 sec.".
Display filter mode

Average processing (Response time)

F0.2

High speed (0.2 sec.)

F1.0Standard speed (1.0 sec.)

F2.0

Low speed 1 (2.0 sec.)

F4.0

Low speed 2 (4.0 sec.)

Display value

4）Overrange warning
The display pressure "FFF" and informs of the over range when pressure which exceeds the ratings pressure
joins in this instrument. The display pressure "-FFF" when the difference pressure is negative.
・Over range pressure
Mono (single) pressure range: 110% or more and -10% or less of the ratings pressure.
Zero center (+-) pressure range : 60% or more and -60% or less of the ratings pressure.
LED display

Fig.2-(2) Function block diagram
Movingaveragefor display
AmplifierPressure sensor

A/D
converting

Value to bemeasured processing
Zero correction

Movingaveragefor output

Output 1 pressure
setting value P1,P2,Hi,Lo

Output 1
On delay
Off delay Comparison result
Power on delay

OFF
N.C.
N.O.

Reversing

Output 1 delay time
setting value on,oF,dP

Output 1
output mode

Output 2 pressure
setting value P1,P2,Hi,Lo

Output circuit

Comparison
output 1

NPN / PNP
Open collector

Comparison output 2
LED display

Output 2
comparison
Output 2 function
setting value HYS/Win

Analogoutput4 to 20 mA / 1 to 5 V
Output circuit
Comparison output 1
LED display

Output 1
comparison
Output 1 function
setting value HYS/Win

D/A
converting

On delay
Output 2
Off delayComparison result
Power on delay

OFF
N.C.
N.O.

Reversing
Output 2 delay time
setting value on,oF,dP

4

Output 2
output mode

Output circuit

NPN / PNP
Open collector

Comparison
output 2

2-2 Max. and min. value memory function
Each value is displayed and the max. value and the min. value of the pressure measurement value can be reset in themax. value memory display mode or the min. value display mode. The min. value memory and the max. value memory
have been always updated immediately after the power supply turning on of this machine. However, the min value
memory synchronizes with the delay timer, and when the time set with the delay timer immediately after turning on of
the power supply passes, is reset automatically. When two system power on delay setting is different, the min. value
memory are reset in one with long set time.
Introduces the application example. After regulated pressure reaches, the min value memory is reset when the time ofthe delay timer is set at time when reaches regulated pressure. Because min value after regulated pressure reaches canbe memorized thus even when pressure is low when the power supply of this instrument is turned on, the time frequently
reset can be saved.
As for min. value and the max. value memory, the value must not be maintained when you intercept the power supply ofthis instrument. Moreover, the delay timer prohibits the lower alarm output and decide time in balance with the alarm
operation, please.
2-3 Function of comparison output
The comparison output possesses quite the same function that operates independently by two systems. The name ineach system is "1" and "2". Each system has one-transistor power output LED one for the power output monitor. Eachsystem can set the parameter of the operation mode etc. by independent operation. The parameter is shown as follows.
（1）Comparison pressure setting point (At the hysteresis mode: P1・P2.

At the window mode : Hi・Lo).

（2）Comparison mode (hysteresis mode and window mode)（3）Output mode (OFF , N.O. , N.C.)（4）Output-on delay time（5）Output-off delay time（6）Power supply-on delay time
The operation of the comparison function can switch the function by setting the comparison mode. Moreover, it can set
OPEN or CLOSE when the relation condition is approved by the comparison output mode. In addition, it can set thedelay time of ON and OFF of the output. It is possible to set in an individual each system and set these according to theusage, please. Please refer to Fig.2- (3)～2- (6) for the operation at each combination of the comparison mode and theoutput mode. Moreover, please refer to Fig.2- (7) for the operation of the delay time.

1) Setting of comparison mode
The basic action of the comparison function is set in the comparison setting mode. When the instrument is shippedfrom our factory, it is set to the hysteresis mode.
Comparison
function mode

Comparison operation

Operation explanation

HYS

Hysteresis

It operates by comparison pressure set point P1 and P2. This modeis set when using it as an upper bound and a low alarm.

Win

Window

It operates by comparison pressure set point Hi and Lo. It operates
as a window comparator of the pressure region that set point Hi and
Lo show.

Displayvalue2) Comparison pressure setting point (at the hysteresis mode : P1,P2)
P1 operates as a comparison set point, and P2 operates as a hysteresis set point.
It becomes high alarm operation whose normal region is P1 or less at P1>P2. Refer to Fig.2- (3)It becomes low alarm operation whose normal region is P1 or more at P1<P2. Refer to Fig.2- (4)3) Comparison pressure setting point (at the window mode : Hi,Lo)It becomes comparison operation for the region (window) that set point Hi and Lo show. The hysteresis at each set
point operates by 1%FS fixation.
It becomes comparison operation in the normal region where Lo becomes a lower bound point by the Hi upper boundpoint at Hi>Lo. The hysteresis point becomes 1%FS in the region. Refer to Fig.2- (5)It becomes the comparison operation of the malfunction region where Hi becomes a lower bound point by the Lo upperbound point at Hi<Lo. The outside in the region becomes a normal region. The hysteresis point becomes 1%FS outsideof the region. Refer to Fig.2- (6)54) Setting of comparison output mode
Each output mode is set by the comparison output mode setting mode. The output mode can set the mode of which itturns off always the output and the output state assumed turning on or turning off when it is normal.
comparison output mode

Open collector output circuitoFF

Always Opening(circuit OFF)nC

Close when it is normal (Normal Close)noOpen when it is normal (Normal Open)

Display value5) Setting of comparison output on/off delay
Each system of the comparison output can independently set on and off delay time. The delay time of on of thetransistor of the output (CLOSE) and off (OPEN) is set regardless of setting (N.C.,N.O.) of the comparison output
mode.
The on delay function delays timing that the set output transistor at time is changed from the state of off (OPEN) into
the state of on (CLOSE).
The off delay function delays timing that the set output transistor at time is changed from the state of on (CLOSE) into
the state of off (OPEN).
Please adjust the setting to 「d0.0」 (0.0 seconds) when the function is unnecessary. Refer to Fig.2- (7).
6) Setting of power on/off delay
The delay timer that works more immediately after the power supply turning on of the instrument compulsorily turns
off the comparison output transistor until set time passes. Refer to Fig.2- (7).
Prohibiting the abnormal output when it doesn't reach regulated pressure when the power supply is turned on by using
this function becomes possible.
Please adjust a set value of the delay timer to 「d00」(0 minutes) when usually operating is necessary immediately after
turning on of the power supply.
7) Output filter settingThis instrument is processing the moving average to the measurement pressure. The calculation frequency of themoving average processing used for a warning output and an analog output is set in the output filter setting mode. The
response is late according to large the figure of the filter mode. This filter setting value is shared with alarm output andanalog output.
When the instrument is shipped from our factory, is set to standard "1.0 sec.".
Average processing (response time)

Output filter mode
F0.2

High speed (0.2 sec.)

F1.0Standard speed (1.0 sec.)

F2.0

Low speed 1 (2.0 sec.)

F4.0

Low speed 2 (4.0 sec.)

Display value

2-4 Function of analog output
1) Analog output
The digitalized pressure measurement value is output as an analog value. As for this value, zero corrections and themoving average filter processing are done at the stage of a digital value. The change of an analog output can be
reduced by slowing down the setting of the filter for the output when there is large change of the measurement
pressure.
2) Function of analog output reversal
The value of the analog output rises when the measured differential pressure rises usually. However, opposite
operation is done by turning on the analog output reversal function.
Function of analog output
reversal AnA

Analog output

oFF

Usually(differential pressure risesonReversal (differential pressure rises

4 → 20mA or 1 → 5V)

Display value

6

20 →

4mA or 5 → 1V)

2-5 Function of display low cut
It is a mode that compulsorily sets the indicated value to 0 when the measurement pressure indicated value is about 0.
When setting value is 「CT2｣ (2%FS), the value of less than ±2%FS becomes 0 displays. Please set CT0 (0%FS) when
you do not use the function.
2-6 Function of sign reversal of display measured
The sign of the display of the pressure display mode and the max. and the min. value display mode is inverted. The
influence of this function is not received about the comparison function, the analog output function, and other functions.
This function is used to invert the sign when negative pressure is measured. Please refer to p.13「4-1 Measured
pressure and connection of piping」 for the usage of this function.
2-7 Function of low power consumption
The electric power consumption is reduced by lowering the display luminance of LED. It is not influenced about otherfunctions at all. The display luminance only at the pressure display mode falls and other program modes etc. become
usual luminance’s when the function is on.
2-8 Function of test modeThis function tests whether the parameter setting is correctly set when the device is set up and checked. In this mode,
simulative pressure can operate the device without applying actual pressure. When the simulative pressure is changed
and the operation of the comparison function and the analog output is confirmed, this function is used. The
simulative-pressure-value is automatically set to present-pressure-value at the time of shifting to test-mode. A
simulative setting pressure is not preserved. The display blinks for the test mode recognition when shifting to the test
mode. It is recognized that the blinking display is not a pressure display mode. The pressure display mode by thepassage of 15 seconds in the no operation time doesn't return in this mode automatically.
2-9 Function to clear set value
When a set value of each mode is shipped in the factory in the mode by which a set value is cleared, it is possible toreturn. However, please note that the set value set to clear once on the user side is deleted.
2-10 Function of set value protecting
It becomes impossible to change set value by each program mode when set value protecting is set. It prevents a set
mistake by the miss operation etc. etc. Please release protecting only when the setting change is necessary.

7Fig.2-(3) Comparison function
Pressure
P1

Hysteresis mode : Upper limit setting（P1>P2）

Alarm ON
P1-P2
Upper limit hysteresis

Alarm OFF

Operation explanation
On detecting the abnormalpressure rise, the comparison
output is operated. In the state
to setting output mode to｢N.C.｣, when pressure exceeds
the setting value P1, output
becomes Open (OFF). When it
falls below P2, output becomes
Close (ON).

P2

Time
NormalPressure state

Abnormal

NormalPower supply on delay timer
Comparison output compulsorily
becomes Open (OFF) while thetimer is working.

Comparison output stateOpen (OFF) always

OFF
Output mode

N.C.

Close (ON)Open (OFF)Close (ON)

N.O.

Open (OFF)Close (ON)Open (OFF)Fig.2-(4) Comparison function

Hysteresis mode : Lower limit setting（P1<P2）
Alarm ON

Pressure

Operation explanation
It compares the outside out ofpressure area from Hi to Lo(window). In the state to setting
output mode to 「N.C.」, whenpressure comes off from the area
(window), output becomes
Close(ON).
When it enters within the area,
output becomes Open (OFF).

Alarm OFF

P1
P2

P1-P2
Lower limit hysteresis

Time
NormalPressure state

Abnormal

NormalComparison output stateOutput mode

OFF

Open (OFF) always

N.C.

Close (ON)Open (OFF)Close (ON)

N.O.

Open (OFF)Close (ON)Open (OFF)8Power supply on delay timer
Comparison output compulsorily
becomes Open (OFF) while thetimer is working.

Fig.2-(5) Comparison function
Pressure

Window mode : Inside area（Hi>Lo）

Alarm OFF

Alarm ON

Hi

Hysteresis
1 % FSLo

1 % FS
Hysteresis

Alarm OFF

Alarm ONTime
AbnormalPressure state

NormalAbnormal

NormalAbnormalOpen (OFF)Close (ON)Open (OFF)Close (ON)Open (OFF)Close (ON)Operation explanation
It compares the setting areasfrom Lo to Hi (window). In thestate to setting output mode to「N.C.」, when pressure enterswhile it is an area (window), theoutput becomes Close(ON).
When it comes off from the area,
output becomes Open (OFF).

Power supply on delay timer
Comparison output compulsorily
becomes Open (OFF) while thetimer is working.

Comparison output stateOFF
Output mode

N.C.
N.O.

Open (OFF) always

Open (OFF)Close (ON)

Close (ON)Open (OFF)Fig.2-(6) Comparison function

Pressure

Window mode : Outside area（Hi<Lo）

Alarm ONLo

Alarm OFF

Alarm ON

Alarm OFF

Hysteresis
1 % FSHi

Operation explanation
It compares the outside out ofpressure area from Hi to Lo(window). In the state to setting
output mode to 「N.C.」, whenpressure comes off from the area
(window), output becomes
Close(ON).
When it enters within the area,
output becomes Open (OFF).

Hysteresis
1 % FSTime
NormalPressure state

Abnormal

NormalAbnormal

NormalOpen (OFF)Close (ON)Open (OFF)Close (ON)

Close (ON)Open (OFF)Close (ON)Open (OFF)Comparison output stateOpen (OFF) always

OFF
Output mode

N.C.

Close (ON)

N.O.

Open (OFF)9Power supply on delay timer
Comparison output compulsorily
becomes Open (OFF) while thetimer is working.

Fig.2-(7) Comparison output delay（ON･OFF , Power supply on）

Close (ON)Operation explanation
The CLOSE / OPEN (ON / OFF)timing of the output transistor isdelayed the delay-setting
time regardless of the setting of
output mode (N.C, N.O).

ON delay time

ON delay time

0.0 to 2.0 sec.

0.0 to 2.0 sec.

Power supply on delay timer
Comparison output compulsorily
becomes Open (OFF) while the timer
is working.

Power supply ON

Open (OFF)Close (ON)Internal
comparison
resultPower supply ON
delay time

0 to 20 min.
OFF delay time
0.0 to 2.0 sec.

Open (OFF)Comparison
outputOpen (OFF)Close (ON)

Close (ON)Ⅲ． INSTALLATION
1. Installation conditions
The following places should be avoided for installation of this unit.
・Don't install where there are intense vibration and impact are applied to this unit.
・Don't install where there is sudden fluctuation of surrounding temperature or place where this unit is exposed to direct
sunlight.
・Don't install where high humidity exists, where water or oil splashes over the unit or where there is much dust.
・Don't install where corrosive gas or flammable gas is generated.

2. Installation of instrument (installation position : Vertical only)
Insert EMD8A body into the panel hole and press the flange of EMD8A enough against the panel so that it hits the panel
surface.

3. WiringPlease keep in mind the following matters when you do the wiring.
External connection diagram is shown in Fig.3- (1). The connection example when an external equipment is connected
is shown in Fig.3- (2)～3- (3).

△！

Caution・Do not let rating of each terminal go beyond the specifications.
・When wiring, be sure to separate the wiring from the wiring of power supply.
・Be sure to use diode and the like to prevent reverse voltage when you connnect relays etc.
・Do not go beyond the following length of wiring.
Power supply cable：30 m max.
Signal cable：30 m max.
If wiring goes beyond the limit, it may cause an error depending on the noise environment.

Fig.3-(1) External connection diagram

EMD8A□□６

type

６
５
４
３
２
１

ＣＮ１
(RITS Connector 6P)
ＨＩＧＨ

ＬＯＷ

10

CN1-1
CN1-2
CN1-3
CN1-4
CN1-5
CN1-6

Power supply +（12 to 24 VDC）
Power supply -（0 V）
Analog output
Comparison output 1
Comparison output 2NC（unused）

Fig.3-(2) Example of connection EMD8A Ｎ□６

type（connecting with photocoupler）

ＥＭＤ８ＡＮ□６

External connection device

CN1 (RITS Connector 6P)
12～24VPower
supplycircuit0V

AnalogoutputcircuitANALOGＮＰＮ ＴｒComparison
output 1
circuitＮＰＮ ＴｒComparison
output 2
circuit

＋
１
２
３
４
５
NC ６

12～24V

１
２
３
４
５
６

－

AC-DC
power
supplyAC-DC
power
supplyOUTPUT 1

OUTPUT 2

0V
NC

１
２
３
４
５
６

100mA Max.

IN

100mA Max.

IN

AC-DC

12～24V power

１
２
３
４
５
６

－

supply

IN ＋
Load

IN －

ＰＮＰ Ｔｒ

100mA Max.

IN

100mA Max.

INOUTPUT 1

ＰＮＰ ＴｒComparison
output 2
circuitLoadtype（connecting with photocoupler）＋

12～24V

Comparison
output 1
circuit0V

External connection device

CN1 (RITS Connector 6P)

ANALOGCOMIN －ＥＭＤ８ＡＰ□６

Analogoutputcircuit

30V Max.

－

IN ＋

Fig.3-(3) Example of connection EMD8A Ｐ□６

Power
supplycircuit＋COM
OUTPUT 2

11

Accessory
・RITS 5P cable with connector
Product code

CAB-RITS5-15△！

CautionColor ofcover

Color of
Insulator

Number ofterminal

Brown

①

Blue

②

Pink

③

Yellow

Black

④

White

⑤

・It is not UL certified product.

・RITS plug connector 5P (produced by TE Connectivity)
Applied cable
Product code

Color of cover

1473562-5

Yellow△！

CautionNominalO.D of the wire covercross-sectional areas
0.1～0.5mm2

1.0～1.15mm

・For crimping wire to connector, a specific RITS plug connector (TE Connectivity),
product number 1729940, must be used.
・For further inquiry on the detail of RITS plug connector and the other tools, please contact
TE Connectivity directly.

Connection propriety○ …
× …

＜The body of EMD8A 6P＞

Right
Wrong

＜RITS plug connector 5P＞
Product code：1473562-5○

There is no contact pin○＜RITS plug connector 6P＞＜The body of EMD8 5P＞○
×

There is contact pin

The contact hole buried withresin on the socket side.

△！

Caution・For crimping wire to connector, a RITS plug connector must be used.
・RITS plug connector is not compatible to other manufacturer's connector because it is not compliant
with the industry standard "e-CON". (The standard "e-CON" is only used in Japan.)12

4. Piping
The instrument, a differential pressure gage, is provided withtaps at the rear side : one for high pressure (HIGH) and theother for low pressure (LOW).
Depending on the application and use, connect piping asfollows.
4-1 Measured pressure and connection of piping
Please connect the piping shown in the table below
according to the measured pressure, and set the functionof inverting sign of measurement display.

Fig.3-(4) Layout of tube tap

ＬＯＷ

ＨＩＧＨ

High pressure
side tube tap(HIGH)

Low pressure
side tube tap(LOW)

Measurement pressure

Differential pressure

Gage pressure

Usage

Differential pressure
measurement

Positive pressure
measurement

Negative pressure
measurement

High pressure side
tube tap
HIGH

Measurement pressure(high)

Measurement pressure(positive pressure)

Opend to atmosphere

Low pressure side
tube tap
LOW

Measurement pressure(low)

Opend to atmosphere

Measurement pressure(negative pressure)

oFF

oFF

on

Piping

Function sign reversal of
display measured△！

CautionFor gage pressure measurement with the instrument of zero-center range (+ -) , connect piping to highpressure tap in order to match symbol on the display (+ , -) and the actual polarity inside the tubingpressure.
Please make the function of inverting sign of measurement display off (oFF) for zero-center (+ -) range
as long as there is no special reason.

Fig.3-(5)
Fan
Duct

△
！

CautionWhen one side of tap is open toatmospheric air, be sure to provide air ventat the outside of panel, or the port released
and open in the panel (box of device etc.) ,has been exposed to in-panel pressure
generated by air flow to cool down inside ofpanel forcibly by fan, etc.

Opening for measurement
Fan
Unit box

Tube
ＥＭＤ８Ａ
Tube
Air vent

13

Coolingair

4-2 Piping material
For tubing material used for taps of this unit, be sure to
use tubing material of I.D 4.
Vinyl or rubber tubes are suitable.
As shown in Fig.3-(6), when inserting the piping into thetap, be sure to push it in until the piping hit the bottom oftap.

Fig.3-(6)EMD8A body
Vinyl, plastic orrubber tube

Tube tap

Fig.3-(7)△！

CautionWhen connecting or disconnecting the piping
to the tube tap, please be sure to grasp thesides of case (the shaded area in Fig.3-(7))
firmly with your fingers.
Do not apply strong force to either the top or
bottom surfaces of the case.

Fig.3-(8)Independent piping○
Room A

Room B

EMD8A

EMD8A

Common piping×
Passageway

Passageway

4-3 Caution of piping
Prohibition of common piping
Piping each of pressure detectors and pressure receiving
instruments tube exclusively dedicated for it, and do notconnect the piping commonly with the adjacent system asshown in Fig.3-(8).
Common piping causes measurement error because thepressure of each system interferes.

Room A

Room B

EMD8A

EMD8A

Errors caused by long distance piping
The speed of response is delayed when the product is used forremote monitoring.
In such application, the I.D. of the connection tube should be
as large as possible.
If the piping conditions of the high and low pressure side are
significantly different, the difference in the piping resistance
between high and low pressure side causes the difference inpressure transmission time, and the measurement becomesinaccurate.
Prevention of clogging at tubes caused by drain･If drain remains within the line, it causes measurement error. Be sure to install the pressure receiving instrument
above the pressure outlet port of the pressure detector and arrange the line so that the drain water should not
remain in the slack piping.
･If the arrangement mentioned above in not possible, install a drain tank and clean it once in a while.
･After the cleaning of the tank, check that the air tightness is fully kept.

14

Ⅳ． OPERATION
1. Before trial running
Before supplying power to this unit for the first time after installation, take care of the following matters.
1) Make sure again of the followings and see if they are correct: location of installation, environment and how the
instrument is installed, wiring and piping etc.
Supplying power with wrong wiring and piping may lead to instrument failure and accidents.
2) Before supplying power, make sure that equipment having other devices and units together with this instrument will
not be affected by alarm circuit even when this instrument causes comparison circuit to work.

2. Operation panel
Fig.4-(1) Display and key function

Comparison output 1 display（red LED）

Pressure and mode indicator（3 ･ 1 / 2 digits segment LED）

Comparison output 2 display（red LED）《Enter》 key:
Register set value of each mode.
By pressing, the display blinks twice
to notify registration.

《Mode》 Key:To change the mode

《Down》 Key:To lower the numerical value ofsetting value of each mode.
One pushing up or down key changes
figure one by one and continuous pushingup or down key changes figure continuously.

《Up》 key:
To raise the numerical value ofsetting value of each mode.

3. How to operate
3-1 Change-over procedure of mode
Please switch to each mode one by one by《Mode》key operation as shown in the Fig.4-(2). Moreover, the mode notfrequently used is made a group as a sub mode. It is possible to shift by continuously pressing《Mode》key for two
seconds or more (thereafter, mark LP) in the sub mode.
It automatically returns to the pressure display mode in modes other than the pressure display mode when there isno key input even if 15 seconds or more pass from the last key input. However, it excludes 《Up》《Down》key input
waiting state of sub mode.
Even if the power supply is intercepted, a set value of each mode is maintained excluding the max. and the min.
value memory, and the test mode.
Please refer to the mode table for the factory default setting.

15

Fig.4-(2) Change-over of mode （Please refer to p.18 for a basic operation in each mode.）
Zero adjustment Setting value protecting

Max. and min. value display

Blinking twice

Max. value display

Sub-setting mode

Hysteresis mode
Window mode

Memory reset
Setting / release
alternate operates
Min. value display

Function mode of output 1 is selected.

Function setting of output 1
Protecting setting

Every
one
secondOutput mode of output 1 is selected.
Output mode setting of output 1

N.C.
N.O.

Protecting release

Every
one
secondOFF
On delay time setting of output 1

On delay time of output 1 is set.
～

Memory reset

Off delay time setting of output 1

Display of the pressure
value to be measured
Usual display
Upper limit over range display
Single pressure range：+ 110 % FS or more
Zero point center range：+ 60 % FS or less
Lower limit over range display
Single pressure Range：- 10 % FS or less
Zero point center range：- 60 % FS or less

Off delay time of output 1 is set.
～＋
Continuouspressing

Continuouspressing

It automatically returns
to the display mode of
the pressure value
when a key is notpressed for 15
seconds.(exclude it at
the time of up anddown key input waitingof the sub-setting
mode.)

Power supply on delay
time setting of output 1

Function setting of output 2

0 to 20 min. (every 1 min.)

Function mode of output 2 is selected.

Continuouspressing

Display mode of the pressure value

0.0 to 2.0 sec. (every 0.1 sec.)

Power supply on delay time of output 1 is set.
～＋
Continuouspressing

0.0 to 2.0 sec. (every 0.1 sec.)

Hysteresis mode
Window mode
Output mode setting of output 2

Output mode of output 2 is selected.
N.C.
N.O.
OFF

Continuouspressing
On de lay time setting of output 2

Function of
output 1 at
window mode

Off delay time setting of output 2

Pressure set point of
output 1, Hi setting

Pressure set point of
output 1, P2 setting

Display filter setting

Display filter is selected.
0.2 sec.

：≪Mode≫ key is pushed

1.0 sec.

：≪Up≫ key is pushed

2.0 sec.

：≪Down≫ key is pushed

Continuous ： Continuous pressing forpressing two seconds or more

0 to 20 min. (every 1 min.)Pressure set point of
output 1, Lo setting

Explanation of mark：≪Enter≫ key is pushed

0.0 to 2.0 sec. (every 0.1 sec.)

Power on delay time of output 2 is set.
～

Power supply on delay time
setting of output 2

0.0 to 2.0 sec. (every 0.1 sec.)

Off delay time of output 2 is set.
～

Function of
output 1 at
hysteresis
mode
Pressure set point of
output 1, P1 setting

On delay time of output 2 is set.
～

Main setting mode

Function of
output 2 at
hysteresis mode
Pressure set point of
output 2, P1 setting

Function of
output 2 at
window mode

Output filter setting

4.0 sec
Output filter is selected.
0.2 sec.
1.0 sec.

Pressure set point of
output 2, Hi setting

2.0 sec.

～

Display low cut setting

4.0 sec
Display low cut value is set.

Pressure set point of
output 2, P2 setting

0 to 5 % FS(every 1 % FS)

Pressure set point of
output 2, Lo setting

Low electric power
consumption setting

The sign inverting of the measurement display
value is set.
Sign inverting
Usually
Analog output reversal is set

Pressure setting point (P1,P2,Hi,Lo) sets the pressure value.
Setting range is within the limits of the pressure range. Unit Pa and kPa.
P1:Pressure setting point at hysteresis mode
P2:Hysteresis pressure setting point at hysteresis mode
Hi:Upper limit pressure setting point at window mode
Lo:Lower limit pressure setting point at window mode

Analog output reversal
Out put to be reversed
Usually
Low electric power
consumption setting

Low electric power consumption is selected.
Low electric power consumption mode

Usual power consumption mode

Error display (detecting two errors at the same time)
Indicating themeasuring pressure value

Indicating theerror code

Indicating the measuring
pressure value

Indicating theerror code
Set value clear

It is shifted to the test mode, and simulative
pressure value is set.
Range of setting pressure:
Single pressure range: – 10 to + 110 % FS
Zero point center range: – 60 to + 60 % FS
Unit
： Pa,kPa
It is returned to the setting value of the factory
shipment.
Setting value is not cleared.
Setting value is cleared.

The error code is indicated automatically and alternately the display mode of the pressure value per second.

16Mode table
Mode typePressure
display

Mode nameModedisplay

Factory default setting
Setting range

Display

Set value

Unit

Usually――

Pa/kPa―Upper limit over range

―

―

―

―

Lower limit over range

―

―

―

―

Zero adjustment―

No zero corrections――

Protecting release―

UnL／LoC

Seting value protecting

―

Quick
Max. value display――

Pa/kPa―Min. value display――

Pa/kPa―Comparison output 1

Main setting
Comparison output 2―

Mono:90%FS ±:+40%FS

Pa/kPa―Mono:89%FS ±:+39%FS

Pa/kPa―Mono:90%FS ±:+40%FS

Pa/kPa―Mono:10%FS ±:-40%FS

Pa/kPa―Mono:10%FS ±:-40%FS

Pa/kPa―Mono:11%FS ±:-39%FS

Pa/kPa―Mono:80%FS ±:+30%FS

Pa/kPa―Mono:20%FS ±:-30%FS

Pa/kPa―

HYS/Win

Output mode

N.C.

―

OFF/N.C./N.O.

On delay time

0.0 seconds

seconds

Off delay time

0.0 seconds

seconds

Power supply
on delay time

0 minutes

minutes

0～20 minutes(every 1 minutes)

Compariosn function
mode

Hysteresis mode―

HYS/Win

Output mode

N.C.

―

OFF/N.C./N.O.

On delay time

0.0 seconds

seconds

Off delay time

0.0 seconds

seconds

Power supply
on delay time

0 minutes

minutes

Display

Response time 1.0 seconds

seconds

OutputResponse time 1.0 seconds

seconds

Displai low cut

±2%FS

±%FS

0～5%FS (every 1%FS)

Sign reversal of
display measured

Off―

on/oFF

Analog output reversal

Off―

on/oFF

Low power consumption

Off―

on/oFF―

Mono: -10～110%FS± ： -60～+60%FS

―

―

―

―

Comparison output 2

Filter

0.0～2.0 seconds(every 0.1 seconds)

0.0～2.0 seconds(every 0.1 seconds)
0～20 minutes(every 1 minutes)
0.2sec/1sec/2sec/4sec

Test mode――Set value clear
Error display

Mono： 0～100%FS± ：-50～+50%FS

Hysteresis mode

Comparison output 1

Sub setting

Hysteresis mode
set point P1
Hysteresis mode
set point P2
Window mode
set point Hi
Window mode
set point Lo
Hysteresis mode
set point P1
Hysteresis mode
set point P2
Window mode
set point Hi
Window mode
set point Lo
Compariosn functionmode（factory default setting）――※All setting value are set to the factory default setting in the clear mode.

17

3-2 Basic operation in each mode
Please refer to Fig.4- (2) for the order of shifting each mode etc. As for the following items, it is executable fromthe pressure display mode according to a quick operation. All basic operations of other each program mode areunited as shown in Fig.4- (3).
Quick operation
＋ LP
＋ LP

Zero adjustment
Setting value protecting
Max. value display
Min. value display
ＬＰ：Continuous pressing for two seconds or more

Fig.4-(3） Example of zero adjustment mode
One pushing 《Up》 or 《Down》 key changes
figure one by one and continuous pushingup or down key changes figure continuously.

Setting item

Selectsetting value

Present
setting value

A target setting value is displayedby operating 《Up》 or 《Down》 key.

Set completion
Blinking twice
Selectsetting value（It is registered in memory）

Next setting item

＜Operation example＞
Set completion
Function settingof output 1

Selectsetting value

Present
setting value

Blinking twice

Hysteresis mode
Window mode

Explanation of mark

Next setting item：≪Mode≫ key is pushed：≪Up≫ key is pushed：≪Down≫ key is pushed：≪Enter≫ key is pushed

1) Registration of set value
It moves from the pressure display mode to each mode one by one by《Mode》key operation. When《Enter》key ispressed with becoming the display of a target mode, present value is displayed, and state moves in the state ofvalue input. Next, after the display value is adjusted to a target set value by operating《Up》《Down》key, 《Enter》
key is pushed. Then, the display blinks twice and registration to the memory is completed. It is not registered
until《Enter》key is pushed even if setting display value is changed.
2) Operation of set value
When a set value is changed in each mode, a set value grows if《Up》key is pushed, and if《Down》key is pushed, a
set value becomes small. It becomes a lower bound if《Up》key is pushed when the indicated value is an upper
limit, and if《Down》key is pushed at the lower bound, it becomes an upper limit. The value increases anddecreases continuously when press and hold a key (key repeat operation). The range which can be set is different
depending on each mode.

3) Error and command protecting when setting is operated
When an illegal value is registered, the display becomes
and registration becomes invalid. Moreover, thedisplay becomes
and registration becomes invalid at the time of the command protecting. The setting
and release alternately change into the setting value protecting at each quick operation (＋ LP).

184) Clearness of the Max. and Min. value
It becomes the following with 《Enter》 key in the following mode.
Max. value display mode
: The max.value is reset.
Min. value display mode
: The min.value is reset.
5) Set value clear mode : A set each value is returned to the state of the factory shipment.
When「YES」is selected in set value clear mode and《Enter》key is pressed, all set values are restored in the stateof factory shipment. When「no」is selected, clearness is not executed. Default is「no」so as not to clear by
mistake.
3-3 Operation of test mode
The measurement pressure value immediately before is set as simulative pressure value immediately after the shiftof the test mode. And, the state becomes a test mode at once. Even if《Enter》key is not pressed, the increase anddecrease of value with《Up》《Down》key becomes effective at once.
3-4 Calibration for Zero adjustment
When this unit is set for the first time or zero point is changed wrong, be sure to perform calibration for zeroadjustment.
To perform zero adjustment, be sure to carry out after warming up the unit for 15 minutes approximately after
power supply. This will help to obtain stable accuracy.
Internal processing is conducted with higher accuracy than displayed accuracy.
Therefore, with no pressure applied and 「0」 is indicated as its pressure, there could be minor deviation that is too
small to be displayed. This is corrected by zero adjustment. Also analog output zero point is automaticallycorrected at the same time.
[Operation procedure]
1) Leaving pressure tubes open to atmospheric air on the H side as well as L side, let this unit have no pressure
applied.
2) In accordance with p.15「3-1 Change-over procedure of mode」,return to the pressure display mode.
3) Press《Up》key and《Down》key at the same time for two seconds or more. The display informs of zero adjustmentcompletion by the display's becoming「000」and blinking twice.
4) Reconnect tubes back to normal and this puts an end to operation.
Note)
When the pressure display value shifts by ±20% or more to the factory shipment, zero adjustment can not to be
done. At this time, the display shows.

△！

Caution・To perform zero adjustment, leave pressure tubes open to atmospheric air on the H side as well as Lside of this unit so that there will be no pressure applied. Upon completion of this operation, be sure toreconnect tubes back to normal.

19

4. If error happens
If error happens, pressure display mode and error display change alternately as shown in Fig.4- (4).In such a case,please confirm error code.
[Solution procedure]
1) The error code is displayed to two lower digits. Please record the value. Two or more errors might occur.
2) Please turn off the power supply of this machine after recording the error code.
3) Please treat it referring to the error code table.
Fig.4-(4) Example of occurrence of error
Pressure display mode（present pressure：３８Pa）

Error display（error code ：０３）
It is alternately
displayed every
second.

Error code tabledisplay value

Error code

Cause

Solution

E.01

The overcurrent occurs incomparison output 1.

Turn off the power supply of this instrument, confirm an
external connection of comparison output 1, and confirm
whether there are miss-wiring or breakdown of connected
equipment, etc. Refer to ※2.

E.02

The overcurrent occurs incomparison output 2.

Turn off the power supply of this instrument, confirm an
external connection of comparison output 2, and confirm
whether there are miss-wiring or breakdown of connected
equipment, etc. Refer to ※2.

※1. Please inquire about error display「E.□□」other than the above of us. Please report the error code, the model
code, the pressure range, the manufacturer's serial number, and the situation of the occurrence.
※2. The overcurrent detecting function doesn't completely protect this instrument. This machine might work
according to the state of external wiring and the failure work.

20

Ⅴ．PRODUCT WARRANTY
Warranty Period
The warranty period shall be for one year from the date that the product has been delivered to the location specified by thepurchaser.
Warranty Scope
In the event of any failure or defect in the product or non-conformity of specifications due to the reasons solely attributable to
Yamamoto Electric Works, Yamamoto Electric Works shall remedy such malfunctioning or defective product at its own cost in oneof the following ways to be selected by Yamamoto Electric Works:ⅰ) repair such product, ⅱ) replace such product.
However, this Warranty shall not cover the damages or defects that arise due to any of the following reasons.
(1) Any failure resulting from improper conditions, improper environments, improper handling, or improper usage other thandescribed in the instruction manual or the specifications arranged between the purchaser and Yamamoto Electric Works.
(2) Any failure resulting from factors other than a defect of our product, such as the purchaser’s equipment or the design ofthe purchaser’s software.
(3) Any failure resulting from modifications or repairs carried out by any person other than Yamamoto Electric Works’ staff.
(4) Any failure caused by a factor that cannot be foreseen at a scientific/technical level at the time when the product has been
shipped from Yamamoto Electric Works.
(5) Any disaster such as fire, earthquake, and flood, or any other external factor, such as abnormal voltage, for which we are
not liable.
Yamamoto Electric Works specifically disclaims all implied warranties of merchantability and/or fitness for a particular use or
purpose, as well as liability for incidental, special, indirect, consequential or other damages relating to the product.
*This product warranty is only valid within Japan.
Product Applicability
Our products are designed and manufactured as general-purpose products for general industries. Therefore, our products are notintended for the applications below and are not applicable to them.
(1) Facilities where the product may greatly affect human life or property, such as nuclear power plants, aviation, railroads,
ships, motor vehicles, or medical equipment(2) Public utilities such as electricity, gas, or water services(3) Usage outdoors, under similar conditions or in similar environments
This document has been translated from the original Japanese version, and the original Japanese version takes first priority.
Be sure to refer to the original Japanese for the details of this warranty.

<Prior notice>
The specifications and description of the product explained in this instruction manual may be subject to change without
prior notice because of modification and the like.

21