RoHS

READ THE INSTRUCTION MANUAL BEFORE USINGINSTRUCTION MANUALMANOSTAR DIGITAL SENSOR
EMD7D3

No. TR-EMD7Ｄ 3-E14

1-2-3,Nishi-shiriike-cho,Nagata-ku,Kobe,Hyogo 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 alarm output ..................................................................................................................................... 5
2-4 Function of analog output ................................................................................................................................... 6
2-5 Function of delay timer ........................................................................................................................................ 6
2-6 Function to clear set value ................................................................................................................................ 6
Ⅲ．INSTALLATION
1. Installation conditions .................................................................................................................................................. 10
2. Installation of instrument
2-1 How to install ......................................................................................................................................................... 10
2-2 How to attach and detach the terminal cover ......................................................................................... 10
3. Wiring................................................................................................................................................................................... 11
4. Piping
4-1 Pressure of measurement and connection of piping ............................................................................. 12
4-2 Piping material ....................................................................................................................................................... 13
4-3 Caution of piping ................................................................................................................................................... 13
5. Accessory for EMD7 .................................................................................................................................................... 13
Ⅳ．OPERATION
1. Before trial running ....................................................................................................................................................... 14
2. Operation panel
2-1 Opening and closing of panel cover .............................................................................................................. 14
2-2 Display and key function ................................................................................................................................... 14
3. How to operate
3-1 Change-over procedure of mode................................................................................................................... 15
3-2 Basic operation in each mode ......................................................................................................................... 17
3-3 Calibration for zero adjustment ...................................................................................................................... 17
4. If error happens .............................................................................................................................................................. 18
Ⅴ．PRODUCT WARRANTY ..................................................................................................................................................... 19

INTRODUCTION
Thank you very much for purchasing of 「MANOSTAR DIGITAL SENSOR EMD7」.

Features
・Compact size
This instrument is a compact digital micro differential pressure gage composed of the diaphragm type detection part andthe alarming function part incorporated in 48 × 48 size.
・Employing an easy-to-see large seven segments LED
Red-colored seven segments LED, 10mm high character of high visibility, is used for four digits (max. three digits forpressure display)・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.
・Conformed to EU directive
・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.
・If the instrument installed in strong electromagnetic field, it may cause the drift of accuracy display to be max. 4%FS.
Keep away from the devices which generate strong electromagnetic field.
・The power of this equipment shall be supplied with 12 to 24Vd.c. from SELV(Separated Extra-Low Voltage) circuit.
・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
Terminal cover

70
8
48

Adaptor of installation panel
Name plate

58

ＡＬＡＲＭ

ＬＯ

ＨＩ

Ｐａ

Front cover is closed
Front cover

４

Ｈ

20

Installation panel(applicable thickness of panel from 1 to 10 mm)

60 or more

60 or more

φ9

φ5.5

ＨＩ

Ｐａ
ＥＮＴ
4.5
ＤＩＳＰＬＡＹ ＣＨＡＲＡＣＴＥＲ Ｏ． ＺＥＲＯ Ａｄｊｕｓｔ
Ｈ. (Ｈ)Alarm Point Ｌ. (Ｌ)Alarm Point
ＨＨ. (Ｈ)Hysteresis ＬＨ. (Ｌ)Hysteresis
Ｈｏ. (Ｈ)Output Mode Ｌｏ. (Ｌ)Output Mode

Front cover is opend

45 +0.6
0

ＭＯＤＥ

５

Ｌ

Manufacturing number

ＡＬＡＲＭ

ＬＯ

２

48

7.5

48

１

(8)
12.5

45 +0.60Detail of tube tap

3

Panel cut size

（adaptor of installation panel）（adaptor of installation panel）

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 alarm
operation can be set to operate quickly though gradually displays because the moving average filter of this
instrument can be individually set for the display and for the output. When the instrument is shipped from ourfactory, is set to "1".
Average processing

Average time

Average number

0High speed

0.2 seconds

101Standard speed

1.0 seconds

50

2

Low speed 1

2.0 seconds

100

3

Low speed 2

4.0 seconds

200

Output filter mode

Indicated value

4）Overrange warning
The display pressure blinks and informs of the over range when pressure which exceeds the ratings pressure
joins in this instrument. Blinks as well as the over range when the difference pressure is negative.
・The display blinking pressure : 110% or more and -10% or less of the ratings pressure.
Fig.2-(1) Function block diagram

AmplifierPressure
sensorUpper limit alarm
hysteresis value

Lower limit alarm
hysteresis value

Value to bemeasured
processing
zerocorrection
Upper limit
alarm
control
outputD/A
converting

Analog output
4-20mA/1-5V
Output circuit
alarm LED display
ALARM HI

ReversingLower limit
alarm
control
outputOutputcircuit
NPN/PNP
Open collector

Upper limit
alarm output

alarm LED display
ALARM LO
ReversingLower limit
alarm output
setting value

Alarm function
mode setting value

Delay timer
setting value

Movingaveragefor output

Upper limit
alarm output
setting value

Lower limit
alarm
detection

Lower limit alarm
setting value

A/D
converting

Upper limit
alarm
detection

Upper limit alarm
setting value

LED display
Movingaveragefor display

Delay timer

4

Outputcircuit

NPN/PNP
Open collector

Lower limit
alarm output

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.
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 alarm output
The alarm output equips with each of one system for the high and for the low, and can select the NPN open collector or
the PNP open collector. （option when factory is shipped）
The operation of the alarm function can select the function by setting the alarm function mode. Moreover, whenalarming, it is possible to set to open or close according to the warning output mode. It is possible to set individuallyand set these according to the usage, please. Please refer to Fig.2- (2)～2- (6) for the operation at each combination of
the alarm function mode and the alarm output mode. When the alarm function is used, it is necessary to do the under
mentioned setting.
1) Alarm function setting
Basic operation of the alarm function is set in the alarm function setting mode. When the instrument is shipped fromour factory, mode is set to "0".
Alarm function mode

Indicated
value

Alarm control operation

Operation explanation0Upper and lower limit
individual detection

The detection result of the upper and lower limit isindividually output.

1

Normality/Abnormal
detection pressure（window comparator）

The judgment within range of regulations is output by one
output.

2

The pressure rise is detected by two stages, and it is possible
Upper limit alarm double
to output individually. The first step is used for warning, andstep detection
the second step is used for the device stop etc.

3

The pressure decrease is detected by two stages, and it isLower limit alarm double
possible to output individually. The first step is used forstep detection
warning, and the second step is used for the device stop etc.

4

The output is turned on when falling below the lower limit.
The output is turned off when exceeding the upper limit.

Simple control

2) Upper and lower limit alarm value setting
Each warning operation pressure value is set in hi and low limit setting mode.
Set range 0 to 100% FS. Display value is displayed by the value of the pressure value.
3) Upper and lower hysteresis setting
Hysteresis value is set in upper and lower hysteresis setting mode.
Hysteresis means the difference between the alarm operation pressure and the alarm release pressure (operation
space).
Set range 1 to 5% FS. Display value is displayed by the value of % FS.
4) Alarm output mode setting
Each output mode is set in upper and lower limit output setting mode.
The alarm output mode sets the alarm output and the output when the cutoff or warning can be set.
Alarm output mode

Open collector output circuit

Alarm light0

Always Opening (circuit OFF)

Always OFF

1

Open at alarming

ON at alarming

2

Closed at alarming

ON at alarming

Display value55) 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 and analog output.
When the instrument is shipped from our factory, it is set to "1".
Output filter mode

Average processing

Average time

Average number

0High speed

0.2 seconds

101Standard speed

1.0 seconds

50

2

Low speed 1

2.0 seconds

100

3

Low speed 2

4.0 seconds

200

Indicated value6) Delay timer setting
The low limit is compulsorily intercepted until specified time passes by the delay timer which works more immediately
after the power supply turning on of this instrument.
When the power supply is turned on by using this function, the lower bound warning can be prohibited when pressure
is low.
Please adjust a set value of the delay timer to "0" when the lower bound warning is necessary immediately after
turning on of the power supply.
Alarm function
mode

Alarm control operation

Influence on alarm operation with delay timer0Upper and lower limit
individual detection

Only the low alarm is prohibited while the timer is working. The hi
alarm is not influenced.

1

Normality/Abnormal
detection pressure（window comparator）

Only the low alarm is prohibited while the timer is working. The hi
alarm is not influenced.

2

Upper limit alarm double
step detection

The timer does not influence each state either.

3

Lower limit alarm double
step detection

It is prohibited with the 1st step and the 2nd step while the timer isworking.

4

Simple control

Indicatedvalue

Even if the timer is working, It is not influenced.

2-4 Function of 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 reducedby slowing down the setting of the filter for the output when there is large change of the measurement pressure.
2-5 Function of delay timer
The time of the timer of the delay timer is set in the delay timer setting mode. When a set value is changed, this value
becomes more effective to be going to turn on the power supply next time.
The delay timer is counted immediately after turning on of this instrument of the power supply and ends at set time. The
lower bound warning is prohibited while the timer is operating. Moreover, when ending, the min. value memory is reset.
The alarm function operates immediately after turning on of the power supply when the timer setting time is set to 「0」,and the min. value memory is reset immediately after turning on of the power supply. When the instrument is shippedfrom our factory, this value is set to "0".
set range : 0 to 20 minutes

The display value is displayed by the amount.

2-6 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.

6

Fig.2-(2) Upper or lower limit alarm individual detection（alarm function Mode 0）
Detection pressure level
Pressure

Alarm ON Alarm OFF

Alarm ON Alarm OFF
Upper limit hysteresis

Upper limit alarm setting value

Lower limit alarm setting value

Lower limit hysteresis
Time
NormalState of pressure

Abnormal

NormalAbnormal Normal

Alarm control output (internal state)0

Controlled output of upper limit alarm

0

1

1

0

Close

Open

Close

Open

Close

Open

0

Controlled output of lower limit alarm

Explanation of operation
The detection result of theabnormal pressure decrease andrise is individually output.
The lower limit alarm turns onwhen the upper limit alarming
setting value is exceeded
the upper limit value, and turns onwhen falling below the lower limit
value.
Delay timer
The lower limit alarming output isprohibited while the delay timer isworking.

Alarm output state
output mode0
Upper limit
alarm output output mode1

Open always
Close

Open

Close

Open

Close

Open

output mode2

Open always

output mode0
Lower limit
alarm output output mode1
output mode2

Fig.2-(3) Alarm function of normal or abnormal detection (alarm function Mode 1)
Detection pressure level
Pressure

Alarm ON Alarm OFF

Upper limit hysteresis

Upper limit alarm setting value

Lower limit alarm setting value

State of pressure

Alarm ON Alarm OFF

Lower limit hysteresis

NormalAbnormal

NormalTime
Abnormal Normal

Alarm control output (internal state)

Controlled output of upper limit alarm

0

1

0

1

0

Controlled output of lower limit alarm

1

0

1

0

1

output mode0
Upper limit
alarm output output mode1

Close

Open

Close

Open

Close

output mode2

Open

Close

Open

Close

Open

output mode0
Lower limit
alarm output output mode1
output mode2

Open

Close

Open

Close

Open

Close

Open

Close

Open

Close

Alarm output stateOpen always

Open always

7

Explanation of operation
The one of output judges that it iswithin regulation range or out ofregulation range.
The other output judges the sameway, because it is reversed state ofdetection.
Delay timer
Only the lower limit alarm side isprohibited while the delay timer isworking.

Fig.2-(4) Alarm function Upper limit double step detection (alarm function Mode 2)
Detection pressure level
Pressure

Alarm ON

Alarm ON Alarm OFF

Explanation of operation
It is possible to use for warning ofpressure increase by the first step,and for the device
stop by second step.

Alarm OFF

Upper limit
hysteresis

Upper limit alarm setting value

Delay timer
Neither is prohibited while the delay
timer is working.

Lower limit alarm setting value
Lower limit
hysteresis

Time
NormalState of pressure

Abnormal1

Abnormal2

Abnormal1

NormalAlarm control output (internal state)0

Controlled output of upper limit alarm
Controlled output of lower limit alarm

0

1

0

0

1

Alarm output stateOpen always

output mode0
Upper limit
alarm output output mode1

Close

Open

Close

output mode2

Open

Close

Open

output mode0
Lower limit
alarm output output mode1
output mode2

Open always
Close

Open

Close

Open

Close

Open

Fig.2-(5) Alarm function Lower limit double step detection (alarm function Mode 3)
Detection pressure level
Pressure

Alarm ON

Upper limit alarm setting value

Lower limit alarm setting value

Alarm ON

Alarm OFF

Explanation of operation
It is possible to use for warning ofpressure decrease by first step,and for the device stop by second
step.

Alarm OFF

Upper limit hysteresis

Delay timer
Both the upper limit and the lower
limit alarming are prohibited while thedelay timer is working.

Lower limit hysteresis
TimeState of pressure

NormalAbnormal1

Abnormal2

Abnormal1

NormalAlarm control output (internal state)

Controlled output of upper limit alarm

0

0

1
0

Controlled output of lower limit alarm

01

Alarm output stateOpen always

output mode0
Upper limit
alarm output output mode1

Close

Open

Close

output mode2

Open

Close

Open

Open always

output mode0
Lower limit
alarm output output mode1

Close

Open

Close

output mode2

Open

Close

Open

8

Fig.2-(6) Alarm function Simple control (alarm function Mode 4)
Detection pressure level
Pressure

Out put ON

Explanation of operation
The one of output is turned onwhen falling below the lower limit.
The output is turned off when
exceeding the upper limit. The
output of the other is reversed.

Out put OFF

Upper limit alarm setting value

Delay timer
Each output is not influenced while
the delay timer even is working.

Lower limit alarm setting value

TimeState of pressure

On standby

Pressure

On standby

Alarm control output (internal state)

Controlled output of upper limit alarm

1

0

1

Controlled output of lower limit alarm

0

1

0

Alarm output state
output mode0
Upper limit
alarm output output mode1

Open always
Open

Close

Open

output mode2

Close

Open

Close

output mode0
Lower limit
alarm output output mode1
output mode2

Close

Open

Close

Open

Close

Open

Open always

9

Note
Each hysteresis setting is invalid.

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)
2-1 How to install
1) As shown Fig.3-(1), insert EMD7 body into the hole of panel cut from the front side of panel. Holding the EMD7
body and insert Adaptor from the end of EMD7 until it hits the panel, watching carefully which side is front andback.
2） Tighten the screws of the adaptor one after the other and make sure that they are tight enough without any
looseness. Too much tightening force will cause Adaptor to come off. In that case, untighten the screw and pushthat frame back and do the retightening.
Fig.3-(1) How to install EMD7

2-2 How to attach and detach the terminal coverFig.3-(2)How to detachthe coverTake out both of

Push down the

Pull out the

凸 part out of theterminal cover

terminal coverInsert the terminal cover

Push up theInsert the terminal cover

into the hole of lower side

terminal cover

凸 part into the hole at theterminal sides

How to attach
the coverboth side of the terminalof the terminal panel

103. Wiring
Please keep in mind the following matters when you do the wiring.
The following shows examples of connection for terminal layout as well as wiring of external devices.

△！

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.
・Terminals for power supply 0 V and output common in this unit are internally connected.
・Be sure to use diode and the like to prevent reverse voltage when you connnect relays etc.
・Make sure of the secured wiring by using crimp terminal and the like for connection.
・Tighten the terminal screws with the torque of 0.7～1.0 N･m. Do not apply excessive torque morethan necessary, otherwise it will damage the instrument body・Do not go beyond the following length of wiring.
Power supply cable（terminal①②）：10 m max.
Signal cable（terminal③④⑤）：30 m max.
If wiring goes beyond the limit, it may cause an error depending on the noise environment.

Fig.3-(3) Terminal connection diagram

4

2

4.5

1

4

3

5

6

Ｌ

Ｈ

6.6 or lessTerminal① Power supply positive side (12 to 24 V DC)
Terminal② Power supply negative side (0 V)
Terminal③ Alarm output COMMON / Analog output negative side
Terminal④ Lower limit alarm output
Terminal⑤ Upper limit alarm output
Terminal⑥ Analog output positive side
Note
Terminal③is common use between Alarm output COMMON and
Analog output negative side.
φ 3.8

Ｍ3.5
Terminal screws

7

Terminal No.

Applicable crimping terminal

Fig.3-(4) Example of connection 1（in connecting with photo coupler）
External connection
instrument

ＥＭＤ７Ｄ３ＮPower
supplycircuit

Analogoutputcircuit

12～24V 1
0V 2

Power
supplycircuit

AC-DC
power
supplyANALOG + 6

Analogoutputcircuit

IN +
IN -

Load

Upper
limit alarm
circuitCOM

Upper
limit alarm
circuit

ALARM HI 5

IN

Lower
limit alarm
circuitNPN TrLower
limit alarm
circuit
ALARM COMANALOG -

ALARM
LO 4
NPN Tr

IN

3

AC-DC
power
supply 0V

External connection
instrument

ＥＭＤ７Ｄ３Ｐ
12～24V 1
0V 2

AC-DC
power
supplyANALOG + 6

IN

PNP Tr
ALARM
LO 4
ALARM COM 3

COM（alarm output : PNP transistor type）

11

IN -

PNP Tr
ALARM
HI 5

ANALOG -（alarm output : NPN transistor type）

IN +

IN

Load

Fig.3-(5) Example of connection 2（in connecting with relay）
External connection
instrument

ＥＭＤ７Ｄ３ＮPower
supplycircuit

Analogoutputcircuit

12～24V 1
0V 2

ANALOG + 6

IN -

Load

ALARM HI 5
NPN TrLower
limit alarm
circuit
ALARM COMANALOG -IN

Lowerlimit alarm
circuit

D2

ALARM
LO 4
NPN Tr

IN

3

AC-DC
power
supply 0V（alarm output : NPN transistor type）

ANALOG + 6

Upperlimit alarm
circuit
R2

R11

AC-DC
power
supply0V 2

Analogoutputcircuit

IN +

COM

Upper
limit alarm
circuit

12～24V 1

Power
supplycircuit

AC-DC
power
supplyExternal connection
instrument

ＥＭＤ７Ｄ３ＰIN +IN -PNP Tr
ALARM
HI 5

IN

PNP Tr
ALARM
LO 4

IN

ALARM COMANALOG -

Load
D2

R2
D11

3

R11

COM

D11

R1,R2 : Relay
D1,D2 : Diode

R1,R2 : Relay（alarm output : PNP transistor type） D1,D2 : Diode

4. Piping
The instrument, a differential pressure gage, is provided with taps at
the rear side : one for high pressure (H) and the other for low pressure(L).Depending on the application and use, connect tubes as follows.

Fig.3-(6) Layout of fittings

4
1
2
3
5
4-1 Pressure of measurement and connection of piping
・Measurement of positive pressure
6
Ｈ
Ｌ
Connect the tube to the high pressure side piping connector(indicated by red color or letter H). The lower pressure port
(blue or L) should opened to atmosphere, but do not remove theHigh pressure
Low pressure
piping connector.
side tube tap (H)side tube tap (L)・Measurement of negative pressure
Connect the tube to the low pressure side piping connector (blue or L).
The high pressure port (red or H) should be opened to atmosphere, but do not remove the piping connector.
・Measurement of differential pressure
Connect the tube from the high pressure piping connector to the high pressure port (red or H) and from the lowpressure piping connector to the low pressure port (blue or L).
In this case, minus (-) symbol is not indicated for pressure display of this instrument.

Fig.3-(7)△！

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.

Fun
Duct
Opening for measurement
Unit box

Tube
ＥＭＤ７
Tube
Air vent

12

Fan

Coolingair

4-2 Piping material
For tubing material used for taps of this unit, be sure to
use tubing material of I.D. 4 as well as O.D. 6.
Vinyl or rubber tubes are suitable.
As shown in Fig.3-(8), when inserting the tube into thetap, be sure to push it in until the tube hit the bottom oftap.

Fig.3-(8)EMD7 body
Vinyl, plastic orrubber tube

4-3 Caution of Piping
Prohibition of common piping
Piping each of pressure detectors and pressurereceiving instruments tube exclusively dedicated for it,
and do not connect the piping commonly with theadjacent system as shown in Fig.3-(9).
Common piping causes measurement error because
the pressure of each system interferes.

Fig.3-(9)Independent piping○
Room A

Room B

EMD7

EMD7

Common piping×
Passageway

Passageway

Errors caused by long distance piping
The speed of response is delayed when the product isused for remote 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 thepiping resistance between high and low pressure sidecauses the difference in pressure transmission time,
and the measurement becomes inaccurate.

Tube tap

Room A

Room B

EMD7

EMD7

Prevention of clogged piping due to 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.

5. Accessory for EMD7
Terminal cover

Panel mounting adapter

polycarbonate-made [installed]polyacetal, steel-made [installed]

Product code：ADPA-EMD7

Product code：TCA-D7

13

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 alarm circuit to work.

2. Operation panel
2-1 Opening and closing of panel coverIf you pull the center of the upper part of panel cover shown in Fig.4-(1), the panel cover opens. For closing thepanel cover, return the panel cover back to the original position and push it lightly.

Fig.4-(1)Pull this part forward
to open panel cover.
ＡＬＡＲＭ

ＬＯ

ＨＩ

Panel coverＰａ

2-2 Display and key function
Fig.4-(2)Upper limit alarm light(red LED)

Lower limit alarm light(red LED)
ＡＬＡＲＭ
ＬＯ《Mode》 Key:To switch mode

Ｐａ
ＭＯＤＥ

Quick manual

One pushing up or down key changes
figure one by one and continuous pushingup or down key changes figure continuously.

Pressure and mode display(four digits segment LED)

ＨＩ

《Enter》 key:
To register setting value of each mode
By pressing, indication blinks twice to notify registration.

ＥＮＴ

ＤＩＳＰＬＡＹ ＣＨＡＲＡＣＴＥＲ Ｏ． ＺＥＲＯ Ａｄｊｕｓｔ
Ｈ. (Ｈ)Alarm Point Ｌ. (Ｌ)Alarm Point
ＨＨ. (Ｈ)Hysteresis ＬＨ. (Ｌ)Hysteresis
Ｈｏ. (Ｈ)Output Mode Ｌｏ. (Ｌ)Output Mode

Panel cover

14《Down》 Key:To lower the setting value of each mode.

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

3. How to operate
3-1 Change-over procedure of mode
The change of the mode is switched one by one by the mode key operation as shown in the figure below. Moreover,the mode not frequently used is made to the group as a sub mode, and can be shifted by pushing M while pushing E
in the sub mode. The mode automatically returns to the display mode in modes other than the display mode when
there is no key input even if 15 seconds or more pass from the last key input.
Even if the power supply is intercepted, a set value of each mode is maintained excluding the max. value memory
and the min. value memory.
Fig.4-(3) Change-over of mode

15

Mode table

Mode typePressure
display

Main

Sub

Max.and Min.
value memory
displayModesymbolFactory default setting
Mode name

Display

Set value

Unit

Setting range

M1

Pressure display mode 1―

Pa/kPa―M2

Pressure display mode 2―

Pa/kPa―M4

Zero adjustment mode

Without zeroadjustment

―

―

M5

Upper limit alarm
value set mode

100％FS

Pa/kPa 0 to 100％FS

M6

Lower limit alarm
value set mode

0Pa or 0.00kPa

Pa/kPa 0 to 100％FS

M10

Alarm function setting mode0:
Upper and lower limit
individual detection―0:Upper and lower limit
individual detection
1:
Normality/Abnormalpressure detection
2:
Upper limit alarm double
step detection
3:
Lower limit alarm double
step detection
4:
Simple control

M11

Upper limit Hysteresis setting
mode

1

％FS

1 to 5％FS

M12

Upper limit alarm output setting
mode

1:Reversing output―

0:Output off
1:Reversing output
2:Non-reversing output

M13

Lower limit Hysteresis setting
mode

1

％FS

1 to 5％FS

M14

Lower limit alarm output setting
mode

1:Reversing output―

0:Output off
1:Reversing output
2:Non-reversing output

M15

Display filter setting mode

1:
Standard speed(50 times, 1.0 second)―

M16

Output filter setting mode

1:
Standard speed(50 times, 1.0 second)―

M17

Delay timer setting mode

0

M18

Setting value clear mode

（Factory default setting）

―

―

M20

Display mode of max.value
memory―Pa/kPa―

M21

Display mode of min.value
memory―Pa/kPa―M3

Pressure display mode 3―

Pa/kPa―M30

Error display mode

―

―

―

0:
High speed(10 times, 0.2 seconds)
1:
Standard speed(50 times, 1.0 second)2:
Low speed 1(100 times, 2.0 seconds)
3:
Low speed 2(200 times, 4.0 seconds)

minute 0 to 20 minutes

Error display*All the setting values are set to the factory default setting in the clear mode.

16

3-2 Basic operation in each modeAll basic operations of each mode are united. Please refer to Fig.4- (3) for each mode display and the range of thesetting.
1) Display
A present mode is displayed by using seven segments LED which one or two digit at the left of display of four
digits. This is different in each mode.
Moreover, a set value in each mode is displayed in a right digit. As for a set value immediately after the changeof the mode, the set value registered in the memory is displayed.
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 ispushed, a set value becomes small. The range where a set value can be changed is different depending on eachmode.
3) Registration of set value
When 《Enter》 key is pushed when changing to a set value of hope, the value is registered in the memory. At
this time, the display blinks twice and the registration completion is shown. The value is not registered until《Enter》 key is pushed even if a set value is changed. Please switch the mode as it is when you change a set
value by mistake.
Moreover, the function of 《Enter》 key is as follows in the under mentioned mode.
Max. value display mode
: The max. value is reset.
Min. value display mode
: The min. value is reset.
Zero adjustment set mode
: Present pressure is registered as zero correction value.
Set value clear mode
: A set each value is returned to the state of the factory shipment.
3-3 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.
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」, changeover to zero adjustment mode.（refer toFig.4-(4)）3) Hit 《Enter》key. This makes display 「0」 and shows flickering twice, meaning that calibration for zeroadjustment has been completed.
4) Reconnect tubes back to normal and this puts an end to operation.
Fig.4-(4） Example of zero adjustment mode
ＡＬＡＲＭ
ＬＯ

ＨＩ

Ｐａ

△
！

Caution・To perform pressure measurement or 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.
・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.

17

4. If error happens
If error happens, mode display shows 「E.」 and starting to flicker as shown in Fig.4-(5).
In such a case, refer to error code.
[Operation procedure]
1) At the status of error 「E.」 flickering, hit 《Mode》 key once.〔Fig.4-(5)〕2) After making sure that displayed flickering stops with error code displayed at the least significant digit, record thevalue.〔Fig.4-(6)〕3) Subsequently, hit 《Mode》 key once. If flickering of display stays stopped, more than on error is taking place. In sucha case, go back to 2) and start again.
4) When the display starts to flicker, it means error display status of 1) is going on. Turn off power supply of this unit.
Please get in touch with us to let us know the detail of error code, your type, pressure range, manufacturing number
and how the problem happened.
Fig.4-(5) Example of occurrence of error
Error
display mode

Fig.4-(6) Example of error display mode
Error code

Display whenerror occurs（blinking）

Present
pressure（blinking）
ＡＬＡＲＭ

ＡＬＡＲＭ
ＬＯ

ＬＯ

ＨＩ

Ｐａ

ＨＩ

Ｐａ

18

Ⅴ．PRODUCT WARRANTY
Warranty Period
This product warranty is valid for one year from the date of delivery to a place specified by an ordering party who
has transacted directly with Yamamoto Electric Works Co., Ltd.
Coverage
If a product breaks down due to a reason for which we are responsible during the warranty period and you return
the product to us, we will either repair or replace the product free of charge.
This warranty does not cover:(1) Usage of the product under any inappropriate conditions or environment contrary to what is described in our
product catalog, specifications or manual.
Handling or usage of the product other than as described in our product catalog, specifications or manual.
(2) Breakdown due to a reason other than a fault within our product.
(3) Any product that has been modified or repaired by a party other than us.
(4) Any breakdown due to a reason that was not foreseeable based on scientific and technical standards appliedat the time of shipment.
(5) Any breakdown due to a reason not attributable to us such as a natural calamity or other disaster.
These terms of warranty represent our entire liability with respect to the product, and we shall have no liability
for any other loss arising in connection with a breakdown of the product.
*This product warranty is only valid within Japan.
This document is a translation from the original Japanese version, and the original Japanese version has priority
over this translation.
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 tochange without prior notice because of modification and the like.

19