RoHS.

READ THE INSTRUCTION MANUAL BEFORE USINGINSTRUCTION MANUAL

Intrinsically Safe Explosion-proof Structure: ia
Type Examination Certification No. CML 19JPN2072X

MANOSTAR TRANSMITTER
EMT1H

No. TR-EMT1H-ia-E01

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 .......................................................................................................................................... 1
II. INTRINSICALLY SAFE EXPLOSION-PROOF STRUCTURE
1．Certification as explosion-proof apparatus ...................................................................... 2
2．Concept of intrinsically safe explosion proof structure .............................................. 2
3．List of laws and regulation related to explosion-proof electric apparatuses .... 2
4．Matching standards and guidelines ....................................................................................... 2
5．Explosion-proof performance of the apparatus (Ex ia IIC T4 Ga) .......................... 3

III. NAME OF EACH PART ...................................................................................................................... 4
IV. BRIEF SUMMARY OD OPERATION PRINCIPLE AND STRUCTURE .................. 5
V. INSTALLATION
1．Places where the apparatus can be used .......................................................................... 5
2．Installation ....................................................................................................................................... 6
3．Safety barrier ................................................................................................................................. 6
4．Wiring/connection ........................................................................................................................ 7
5．Zero point adjustment ................................................................................................................ 9
6．Measurement of pressure and connection of pipes ...................................................... 9
7．Precautions regarding pipe .................................................................................................... 10

VI. SPECIFICATIONS
1．Product code ............................................................................................................................... 11
1．General specifications ............................................................................................................. 12
2．Specifications concerning explosion proof ..................................................................... 12VII. EMT1H ACCESSORIES ................................................................................................................ 13
VIII. DISPOSAL ........................................................................................................................................... 15
IX. PERIODIC INSPECTION ................................................................................................................ 15
X. PRODUCT WARRANTY ................................................................................................................... 15

INTRODUCTION
Thank you very much for choosing our Manostar Transmitter Type EMT1H. The apparatus is a micro differential pressuretransmitter wherein our manostar transmitter type EMT1 is improved to ensure the intrinsic safe explosion-proof structure. Itfeatures, in addition to the performance of the original high-precision micro differential pressure transmitter, explosion-proof
performance that prevents the apparatus from being the ignition source even it is used in a hazardous area where flammablegas is generated.

△！

CAUTIONFor using the apparatus safely:- Be sure to carefully read the operating instruction manual before using the apparatus and use it in acorrect and safe manner within the rated specifications. Improper use may cause apparatus failure, which
may induce damage, accidents, etc.
- Keep this manual handy in a safe place.

I. PRECAUTIONS
The apparatus features the intrinsic safe explosion-proof structure. Although the structure has higher reliability compared toother explosion-proof structures, the reliability will deteriorate significantly unless the prerequisites for explosion-proof
structures are observed and the intended explosion-proof performance cannot be maintained. Before using the apparatus, thefollowing precautions must be observed. For details related to explosion protection, refer to the references shown below:
References:- JNIOSH-TR-46-1：2015- JNIOSH-TR-46-6：2015- JNIOSH-TR-NO.44△ WARNING！

- Do not use the apparatus in dangerous places, excluding the target gas atmosphere.
Use of the apparatus in the non-target flammable gas atmosphere may cause an explosion because the apparatus becomes the ignition
source.

- Use the apparatus in combination with the safety barrier.
Use of the apparatus not combined with the safety barrier may cause an explosion because the apparatus becomes the ignition
source.

- Lay down the apparatus with the capacitance and inductance of wiring cables set below the allowable values.
Wiring cables whose capacitance and inductance exceeds the allowable values accumulates energy that could be the ignition source,which may cause an explosion.

- Wiring cables should be laid down in a manner that they are not affected by electromagnetic induction and static induction.
When a voltage or current is induced by electromagnetic induction or static induction, sparks that could be ignition sources may occur,
resulting in the danger of explosion.

- Use the apparatus with the cover installed.
The intrinsic safety cannot be guaranteed with the cover detached and the apparatus cannot be used in hazardous areas.

- In case a seal is attached on the apparatus, the surface area should be 400 mm2 or below, or the thickness should be 0.2
mm or below. In addition, use a waste cloth immersed in water should be use for cleaning of non-metallic material parts.
Charging of static electricity may cause sparks that could be ignition sources, resulting in an explosion hazard.

- Do not use the apparatus for measuring pressure of corrosive gases and toxic gases
The apparatus is not of the corrosion-proof type. Use of the apparatus for measuring pressure of corrosive gases and toxic gases may
erode the internal mechanism and discharge gases, which may pose hazards to the human body.

- Do not use the apparatus in places where significant vibrations or shocks exist.
Use of the apparatus in places where significant vibrations or shocks exist may induce deterioration in performance or failures,
which may cause damage and disasters.

- Do not disassemble or modify the apparatus.
Disassembling or modification of the apparatus not only voids the warranty, but also induces deterioration in performance or failures,
which may cause damage and disaster.

△ CAUTION！

- Regarding the installation place and installation method, be sure to refer to the operating instruction manual.
- Do not use organic solvents for cleaning the apparatus.
Use of organic solvents corrode the surface and may cause deterioration in performance or failures, including peeling off of the coating.

- Do not pull the pipes with excessive power.
Pulling the pipes with excessive power may break the connector.

1II. INTRINSICALLY SAFE EXPLOSION-PROOF STRUCTURE
1． Certification as explosion-proof apparatus
In Japan, only the explosion-proof apparatuses that passed the type examination for electric machines and apparatus of
explosion-proof construction can be used. The type examination of explosion proof includes the guidelines according to the
explosion proof design standards for electrical and mechanical equipment (popular name: the structure standards) and theguidelines that are harmonized with international standards (popular name: the technical standards). The micro differential
pressure transmitter described herein (EMT1H type) passed the examination of the certification authority and is certified as
the explosion proof design electrical and mechanical apparatus featuring an intrinsically safe explosion-proof structure that
conforms to the International harmonization explosion-proof Guideline Ex2015.
(Type examination certification No. CML 19JPN2072X)

2． Concept of intrinsically safe explosion proof structure
The explosion-proof structures include the following:
Explosion-proof
Explosion-proof
structuremethodBrief Summary

Pressurized apparatus
Oil-immersion
Equipment protection
by resin immersion

Isolation ofignition source

Explosion proof performance is secured by isolating the parts of electric
apparatus that could be ignition sources from the surrounding explosive
atmosphere.
Although an explosion occurs inside the electric apparatus, explosion
proof performance is secured by isolating the flame so that it will not ignite
the surrounding explosive atmosphere.

Encapsulation

Increased safey

Enhancement ofsafety degree

Regarding electric apparatuses wherein no spark-generating part or
high-temperature part that could be an ignition source exists, explosion
proof performance is secured by further enhancing safety.

Intrinsic safety

Inhibition ofignition ability

Explosion proof performance is secured by inhibiting occurrence of energythat could be an ignition source even in the regular condition or in the
stipulated failure condition with the use of intrinsically safe circuits.

(1) Inhibiting energy
For flammable gas to catch fire, energy exceeding a certain quantity is required. Should a spark occur, the gas will notcatch fire if the energy of spark does not reach the afore-said energy. Therefore, energy is inhibited with the relay
barrier that is installed in the non-hazardous area to prevent feeding excessive energy to the micro differential pressuretransmitter.
(2) Not accumulating energy
Even if the feeding of energy is inhibited externally, it is meaningless when energy is accumulated in hazardous areas.
Our apparatus is designed in a manner that the energy to be accumulated in circuits can be inhibited to prevent theapparatus will not be the ignition source.
(3) Inhibiting increase in temperature
Flammable gases catch fire due to temperature. Our apparatus is designed in a manner that the increase in temperature
is inhibited to the level that any target gas will not catch fire within the range of operating ambient temperatures.

3． List of laws and regulation related to explosion-proof electric apparatuses(1) Industrial Safety and Health Act
June 8, 1972 Law No. 57(2) Enforcement ordinance of Industrial Safety and Health Act
August 19, 1972 Cabinet Order No. 318(3) Ordinance on Industrial Safety and Hygiene
September 30, 1972 Ministry of Labour Ordinance No. 32(4) Ordinance on Examination of Machines and Other Equipment
September 30, 1972 Ministry of Labour Ordinance No. 45

4． Matching standards and guidelines(1) Explosion proof design standards for electrical and mechanical equipment
April 1, 1969 Ministerial Notification No. 16 of the Ministry of Labour(2) Explosion-Proof Guide
August 31, 2015 Labor Standards Bureau Notification 0831 No. 2, etc.
(International harmonization explosion-proof guideline Ex2015)2

5． Explosion-proof performance of the apparatus (Ex ia IIC T4 Ga)
Ex
(i)

ia
(ii)

ⅡC
(iii)

T4
(iv)

Ga
(v)

(i) The code shows the explosion-proof structure conforming to the International harmonization explosion-proof guideline.
(ii) The code “i” shows the intrinsically safe explosion-proof structure and it is further classified into “ia”, “ib” and “ic.”For the intrinsic safety, “ia” shows the highest level and it can also be used as “ib” or “ic”.
(iii) The code shows the group of apparatus and it is further classified into “I”, “II” and “III”.
In addition, regarding “II” and “III”, they are further segmentalized by adding either one of “A”, “B” or “C”.
Group I: Usable in mines that are likely to be affected by mine air.
Group II: Usable in areas, excluding mines that are likely to be affected by mine air, where explosive gas atmosphere
exists.
* “IIC” can also be used as “IIB” or “IIA”.
Group III: Usable in the explosive-dust atmosphere, excluding mines that are likely to be affected by mine air.
(iv) The code shows the temperature classes and is further classified according to the maximum surface temperatures to which
the apparatus reaches within the range of operating temperatures.
* For Group II, the range of usable gas atmosphere is determined according to combinations of (iii) and (iv) as shown below:
Table II-(1): Typical Explosive Gas Groups and Temperature Classes
Group

Low ←

Temperature Class(Ignition Temperature)

Hazard Ratio
IIA→ HighIIB

IIC

Carbon monoxide

Water gas
Hydrogen

T2(Exceeding 300°C and
450°C or below)

Isopentyl acetate
ButanePropaneMethanolAcetic acid anhydride

Ethanol
Ethylene
Ethylene oxide

Acetylene

T3(Exceeding 200°C and
300°C or below)

HexaneLow ←AcetoneAmmonia
EthaneAcetic acid
Ethyl acetate
TolueneBenzeneMethaneT1(Exceeding 450°C)

Hazard Ratio

T4(Exceeding 135 and 200°C Acetaldehyde
or below)

Diethyl ether→ HighT5(Exceeding 100°C and
135°C or below)
T6(Exceeding 85°C and
100°C or below)

Carbon bisulfide* The content of the table is quoted from JNIOSH-TR-44.
: Shows the scope where the apparatus can be used.
(v) The code indicates the equipment protection level (EPL) and shows the hazardous area where installation is possible.
The intrinsically safe explosion-proof structure Group II is classified into either of “Ga”, “Gb” or “Gc”.
“Ga”: Installation is possible in Class 2 hazardous area, Class 1 hazardous area and special hazardous area.
“Gb”: Installation is possible in Class 2 hazardous area and Class 1 hazardous area.
“Gc”: Installation is possible in Class 2 hazardous area.

△！

CAUTION

The apparatus is not the corrosion-proof type.
Even for gases that are classified in the above-stated scope, the apparatus cannot be used in the
corrosive-gas atmosphere.

3III. NAME OF EACH PARTName of Each Part (for vinyl tube) and Panel cut size

100
Panel cut size

88
4×φ 5 installation long holes

88±0.3116±0.3

116

100

4×M4 Cover mounting screw

4×φ5
or 4×M4

Connector(LOW)

Please attach the cover so as
to satisfy IP 20 and use it.

Connector(HIGH)

Cover

115

Wiring takeout opening(G1/2 female screw)

ＬＯＷ

32

7

Ｇ
ＨＩ Ｈ

Nameplate55

4

IV. BRIEF SUMMARY OF OPERATING PRINCIPLE AND STRUCTURE
When a pressure is applied to the connector (HIGH), connector (LOW) or simultaneously to both connectors, Diaphragm①
and Diaphragm Disk ② push Core ③ installed at the leading end of double leaf spring in the upward or the downward
direction. On the outer perimeter of the core, two coils (a) and (b) are wrapped around Bobbin ④, and the bobbin divides thepressure-receiving chamber and the outside world. When the core moves up or down, the inductance (electromagnetic
interaction) of Coil (a) or Coil (b) changes in a differential manner; either one increases or another one decreases. The
differential amount of inductance is proportionate to the pressure, and measurement of the differential inductance value canmeasure the pressure indirectly.
In the electronic circuit, the difference in inductance of Coil (a) and Coil (b) is converted into voltage by using the oscillation
circuit and the detector circuit. Thereafter, the span adjustment and the zero-point adjustment are implemented in theamplifying circuit, and the linearity is compensated in the linearizer circuit. The output circuit plays the role of the 4 to 20 mA
current source when viewed from the externally connected equipment, and the pressure value is shown in current values by
proportionating the current value to the output voltage of the linearizer circuit.
Explanatory Chart of Structure

Block Diagram of Electronic Circuit
Span setba

Zero set

Amplifying circuit

Linearizer

Wave detection
circuit

Out put
circuit

4～20mA DC
4
3

External
connection
instrument－

Power supply
DC 24 V＋
E

4

Oscillation
circuit
Connector(HIGH)

Connector

Connector(HIGH)(LOW)

Connector
(LOW)

１

2

Diaphragm

E

Grounding3

V. INSTALLATION
1． Places where the apparatus can be used
The apparatus can be used in the special hazardous area, Class 1 hazardous area and Class 2 hazardous area. The
apparatus should be installed and used in the area where all of the following conditions are satisfied.

Target gas atmosphere

Refer to Table II-(1) “Typical Explosive Gas Groups and Temperature Classes” on Page 3.
* The apparatus cannot be used for corrosive gas.

Ambient temperature

0°C to +40°C (No freezing)* Avoid installation in areas where ambient temperatures change suddenly.

Ambient humidity

90%RH or below (No condensing)△！

WARNING△！

CAUTION- In the special hazardous area (Zone 0), robustly prevent generation of sparks that could be the ignition
source caused by applying shocks or frictions on the apparatus container.
- Do not use the apparatus for measuring pressure of corrosive gases or toxic gases.

- Pay careful attention to handling in the environment where static electricity is likely to be charged.
- The apparatus cannot be installed outdoors as it is. Install the apparatus after accommodating it in an
outdoor storage box.
- Install the apparatus as far as possible from devices that generate strong electromagnetic fields.

52． Installation- The apparatus must be installed in a horizontal posture (inclination angle: within ±5°)* If the installation surface is vertical, use the “bracket for installation on vertical wall surface” (Refer to Page 13).
- A minimum space of 0.5 m must be allowed above the apparatus for the purpose of adjustment and maintenance services.

3． Safety barrier
The apparatus constitutes the intrinsically safe explosion-proof structure when it is used in combination with the Safety
Barrier (MTL7787+).
External View of Safety Barrier (MTL7787+)

Hazardous area
terminal

Non-hazardous
area terminal* Installation/wiring of safety barrier （MTL7787+）- The barrier should be installed in non-hazardous areas, and Class A grounding should be applied independently.
- Installation of the barrier on the DIN rail enables conduction between the grounding terminal of the barrier and the
DIN rail.
- When the DIN rail is mounted on a metal panel or cabinet, an insulating block, grounding terminal, etc. are required toensure the Class A grounding independently. Use the optional DIN rail set (Refer to Page 13).

△！

CAUTION

For details of the safety barrier (MTL7787+), refer to the URL shown below:
Cooper Industries Japan K.K.: http://www.cooperindustries.jp/

6

4． Wiring/connection(1) Connection diagram
Figure V-(1): Terminal Connection Diagram
１.When used in combination with safety barrier (MTL7787+) and our receiver (EMP5/EMP5A)
Hazardous area Non-hazardous area
Receiver（EMP5/EMP5A）

EPL：GaAmbient temperature：0～40℃
Micro differential
pressure transmitter

Safety barrier（MTL7787+）

（＋）

3

（＋）
Intrinsically

EMT1H （－） safe circuit （－）
4

（＋）

（＋）

3

1

4

2

9

（ー）

10

Non-intrinsically（－） safe circuit （－）

19

E
（＋）
Class D grounding

18

・Since our receiving instrument
incorporates the DC power supply circuitfor micro differential pressure transmitter,no separately-installed DC power supply
is required.
* When EMP5A is used, an input
resistance of 50 Ω is required between
18 and 19.

Class A grounding

２.When used in combination with a safety barrier (MTL 7787 +) and an external DC24V power supply
Hazardous area Non-hazardous area
EPL：GaAmbient temperature：0～40℃
Micro differential
pressure transmitter

Safety barrier（MTL7787+）

（＋）

（＋）

3

EMT1H

Intrinsically（－） safe circuit （－）

4

DC24V
power supply

（＋）

3

1

4

2

（＋）

Non-intrinsically（－） safe circuit （－）

E
Class D grounding△！

CAUTIONClass A grounding

Receiver（Load resistance 250 Ω or less）

・For the 24 V DC power supply used, use
the constant-voltage power supply whose
ripple is within 0.2 V P-P.
・The 0 V terminal of the DC power supply
should be connected to the grounding
terminal of the barrier.
・ The apparatus should be operated withthe load resistance of 250 Ω or below.

Because the safety barrier (MTL7787+) that comes with the apparatus is of the non-isolated barrier(Zener barrier), when the apparatus is used in the special hazardous area, the power supply isolated withthe two-winding transformer (24V DC) and the protection by means of adequately rated fuse at the
primary side are required.
For details, refer to JNIOSH-TR-NO. 44.

Figure V-(2): Terminal Arrangement Diagram

SPAN

ZERO

Terminal Block

Terminal block

Terminal 1 ------ Do not connect anything.
Terminal 2 ------ Do not connect anything.
Terminal 3 ------ Micro differential pressuretransmitter output （+）
Terminal 4 ------ Micro differential pressuretransmitter output （-）

Grounding terminal
１

２

３
＋

４
－

Ｅ

△
！

CAUTION- The terminal block and the grounding terminal should be robustly connected by using crimping terminals
that fit M4 screws.
- The terminal screws should be tightened with the force of 1.0 to 1.3 N・m.
- Be careful that excessive tightening results in damage of the instrument.
- For the wiring cables of the intrinsically safe circuit, shielded cables should be used and the shield wires
should be connected to the grounding terminal of the safety barrier.

7(2) Power supply
The apparatus should be used with the power supply voltage of 24 V ± 10% DC (Ripple: Within 0.2 V P-P).
(3) Wiring
With the electric circuits of the apparatus, the capacitance and the inductance are controlled so that any energy that
could be ignition sources will not be accumulated. However, because the capacitance and the inductance that are
generated in wiring cables (intrinsically safe circuit) from the apparatus to the safety barrier differ depending on the
installation environment, the user is asked to control and keep them at the allowable value or below.
Wiring should be done so that the following conditions can be satisfied:Wiring Conditions between EMT1H and Safety Barrier （MTL7787+）
Capacitance (Cc)
: 0.05 μF
or below
Inductance (Lc)
: 2.00 mHor below
Interconnection resisance: 10 Ω
or below
Cross-sectional area of wire conductor: 0.5 to 2.5 mm2* Because it is difficult to execute adjustment of wiring cables after finishing wiring, it is recommended that the actual
capacitance and the inductance of the cable to be used should be measured in advance and then start the work after
giving a general guide.

△！

CAUTION- Execute wiring of cables according to Figure V-(1): Terminal Connection Diagram and, after finishing
the work, be sure to check for any wrong wiring.
- For wiring cable and pipes, reliable parts should be used.
Regarding the wiring, detailed explanation is described in the Reference JNIOSH-TR-44 according todifferent types of installation environment.

8

5． Zero point adjustment
The apparatus should be installed in a horizontal posture and then zero point adjustment must be executed.
(1) After checking for any wrong wiring/connection, feed the power and conduct warming up for about 10 minutes.
(2) In case the pipes at the mouth rings of the apparatus are detached both at HIGH and LOW sides to ensure theatmospheric open condition or the calibration valve device is installed, activate the valve to reduce the pressure
to be applied to the apparatus to zero (0).
(3) Detach the cover of the apparatus, and rotate the ZERO SET adjuster located inside to set the current to thezero-point output current shown in Table V-(1).
Fig. V-(3) Transmission Output Diagram(Pressure-Output Signals)
For single pressure range

Fig. V-(4) Adjuster Arrangement Diagram

Do not handle it.

For zero center range

ZERO SET

20mA
12mA

Output signal
（mA）

4mA
0
0

50

100

-50

0

+50

Pressure （％FS）

E(Caution)
The SPAN SET adjuster has been adjusted in
the factory. Do not rotate it.

Table V-(1) Output Signal

Zero-point output current△！

CAUTION

Single pressure range± range

4.0mA DC12.0mA DC- The zero-point adjustment must not be executed under the explosive atmosphere.
- After completing the zero-point adjustment, be sure to restore the cover of the apparatus tothe original position.
The intrinsic safety is not guaranteed with the cover detached.

6． Measurement of pressure and connection of pipes(1) Measurement of positive pressure
Connect the pipe to the connector (HIGH). The connector (LOW) is subject to atmospheric pressure.
(2) Measurement of negative pressure
Connect the pipe to the connector (LOW). The connector (HIGH) is subject to atmospheric pressure.
(3) Measurement of differential pressure
Connect the pipe with higher pressure to the connector (HIGH) and the pipe with lower pressure to the connector(LOW).

△！

CAUTION

When the gauge pressure is measured with a zero-center range instrument, the pipe should beconnected to the connector (HIGH) to match the codes (+ and -) of the receiving instrument
and the polarity of the inner pressure of pipe.
Ensure the pressure at the connector (LOW) to be atmospheric pressure.

9

7． Precautions regarding pipe1

- Before starting the piping work, be sure to read through theSection VII “EMT1H Accessories.”- Considering the maintenance service work, it isrecommended to install the calibration valve device as shownin the right-hand figure.

2

4

EMT1H

Duct
3

①Calibration valve device②Static pressure side valve③Total pressure side valve④Pressure equalizing valve

Room A

Room B

EMT1H

EMT1H

Common piping ×
Passageway- Prevention of clogging of pipe caused by drainage
Because measurement error for pressure occurs whendrainage accumulates in the pipes, the instrument should beinstalled above the pressure pick-up port of the pressure
detector to prevent accumulation of drainage at the sagging
part generated on the pipe. If unavoidable, install the draintank on the way of the pipe as shown in the right-hand figureand execute cleaning on a regular basis. After completing thecleaning work, check that airtightness is ensured.

Independent piping ○Passageway- Prohibition of common piping
The pipes from the pressure detector and the instrument
shall be independent pipes for each line as shown in theright-hand figure, and never allow common pipes withneighboring lines. If common pipes are employed, errors will
occur because the pressures from the independent lines
interfere with each other.

Room A

Room B

EMT1H

EMT1H

Drain
tank

Drain

- Pressure setting of high-temperature gas
For the pressure setting of high-temperature gas, use a refractory metal (stainless steel pipe, for example) for thepressure detector (pitot tube), and use metal pipes having the length that is required for cooling the high-temperaturegas between the detector and the instrument body.

- Error caused by long-distance pipe
If piping of instrument is done for a long distance, the response speed will become slower. Employ thicker pipes on theway as much as possible. In addition, because the pipe resistance differs at the higher-pressure and lower-pressure
sides if piping conditions significantly differ for the higher and the lower sides, a time lag in pressure transmission
occurs and accurate differential pressure cannot be measured.

10

VI. Specifications
1．Product code
Pressure range code

ＥＭＴ１Ｈ Ａ ０ ＦＭ Ｄ １００ （example）
Pressure range

Max. value of scale
Ｄ
Ｅ

Unit

Ｐａ
ｋＰａ

ＦＶ For vinyl tube
ＦＭ For metal tube

Piping connector
OutputType

Pressure range code
D 10

０

Two wires method from 4 to20 mA DC

Ａ

Drip-proof indoor-use typePressure range
0 ～ 10Pa

D 15

0 ～ 15PaD 20

0 ～ 20PaD 30

0 ～ 30PaD 50

0 ～ 50Pa

D 75

0 ～ 75PaD 100

0 ～ 100

PaD 150

0 ～ 150Pa

D 200

0 ～ 200

PaD 300

0 ～ 300

PaD 500

0 ～ 500

PaD 750

0 ～ 750

Pa

D 10000 ～ 1000 Pa

E1

0 ～ 1

kPa

E2

0 ～ 2

kPa

E3

0 ～ 3

kPa

E5

0 ～ 5

kPa

E 10

0 ～ 10kPa

E 20

0 ～ 20kPa

E 30

0 ～ 30kPa

E 50

0 ～ 50kPa

E 100

0 ～ 100 kPa

D +-10-10 ～ +10

Pa

D +-20-20 ～ +20

Pa

D +-30-30 ～ +30

Pa

D +-50-50 ～ +50

Pa

D +-100-100 ～ +100 Pa

11

2． General specifications
Product nameMicro differential pressure transmitterType

EMT1H typePressure measurement
systemDiffrential pressure type

Atmosphere to be measured

Air and non-corrosive gas (Liquids cannot be measured)Withstanding pressure of
main instrument body

500kPaRated voltage

24 V DC ± 10% (Ripple: Within 0.2 V P-P)

Output signal

4 to 20 mA DC (Load resistance: 250 Ω or below)

Withstand voltage

Across terminals and grounding terminal
500 V AC 50/60 Hz, 1 min., 1 mA or below

Operating ambient
temperature

0 to 40°C (No freezing) *1

Operating ambient humidity

90% RH or below (No condensing)Mechanical durability
vibration

5 to 10 Hz Amplitude 10mm;
10 to 50 Hz Acceleration 39 m/s2 (3 axial directions; 2 hours each)

Impact resistance

100 m/s 2 (3 axial directions; 6 times each)

Installation posture

Horizontal (0°±5°)

WeightApprox. 1100 g*1: The operating ambient temperature of the apparatus is 0 to 40°C, which is different from the regular range of operating
ambient temperature (-20°C to +40°C) of general electric apparatuses.

3． Specifications concerning explosion proof
Explosion-proof performance

Intrinsically safe explosion-proof structure (Ex ia IIC T4 Ga)

Applicable guidelinesJNIOSH-TR-46-1：2015
JNIOSH-TR-46-6：2015

Allowable voltage of
intrinsically safe circuit (Ui)Allowable current of
intrinsically safe circuit (Ii)
Allowable electric power of
intrinsically safe circuit (Pi)

28 V
93 mA
0.65 W

Internal inductance (Li)Ignorable value

Internal capacitance (Ci)Ignorable value

Target gas atmosphere

Refer to Table II-(1) “Typical Explosive Gas Groups and Temperature Classes” onpage 3.

Maximum surface
temperature
Equipment protection level
(EPL)

135°C
Ga

Degree of protection

IP20

Hazardous areas where theapparatus can be installed

Special hazardous area *2
Class 1 hazardous area
Class 2 hazardous area

*2: In the special hazardous area, robustly prevent generation of sparks that could be the ignition source caused by shocks orfriction on the container.

12

VII. EMT1H ACCESSORIESDIN Rail Set for Safety Barrier [Optional]

DIN rail mounting image

Product code: DIN-T1H- Use the DIN rail set to ensure Class A grounding of the accessory safety barrier independently.
- Up to five units of safety barrier can be installed.

Bracket for Installation on Vertical Wall Surface: Made of steel [Optional]
8×φ5 installation holes for transmitter

φ30
135

0.5 m
or moreVertical wall surface

135

1.6
55 25
100

4×φ7 installation holes on wall

110

12.5

* Mounting screws are not included.

Product code: BRKT-T1GP1- The apparatus must be installed in a horizontal posture (inclination angle: within ±5°).
- If the installation surface is vertical, use the bracket for installation on vertical wall surface to ensure
the horizontal installation.
- A minimum space of 0.5 m must be allowed above the apparatus for the purpose of adjustment andmaintenance services.
Accessories for Cable Wiring

Metal Cable Gland: Made of ZDC and FCD [Optional]

Product code

【Non RoHS compliant product】

Color of Rubber BushMatched Outer Diameter ofWire (mm)
Min.

Max.

SC4-1T

Gray

3.5

7.0

SC4-2T

Black

6.5

9.0

SC4-3T

Red

8.5

11.0

- When instrumentation cables are used for wiring of the apparatus, use the cable gland shown in the above-stated figure.
- Pay careful attention to the finished outer diameter of the cable to be used and choose the cable of the size that enables
the rubber bush to force down and under the outer diameter of cable when the hexagon cap nut is loosened.
- Shielded cable should be used.

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Accessories for Conduit Wiring

VT Type Connector (for vinyl pipe): Made of brass[Standard attachment for vinyl pipe]

Adapter for Conduit: Made of brass [Optional]
25

22

C19

Thread forcable conduit

φ15

G 1/2

10

Product code: ADPA-EMT1

Product code: KGAT1VT

The cable inlet of the apparatus is of the female screw if G1/2.
When wiring is made through the thin steel conduit pipe withnominal designation 19 or the flexible metal conduit pipe, use theadapter for conduit shown in the left-hand figure.

The mouth ring designed for vinyl pipe, rubber pipe, urethane
pipe, etc. that are installed on ＜EMT1HA0FV Type＞ as thestandard part. For the pipe, use the one with internal diameter 6
and wall thickness of 1 mm or over. Note that, if the line pressure
is 50 kPa or over, the withstanding-pressure pipe (including
vacuum pressure, either) should be chosen.

MT Type Connector (for metal pipe; ring-joint type):
Made of brass [Standard attachment for metal pipe]

Inner Sleeve Set: Made of polypropylene [Optional]

Product code: KGAT1MT

Product code: XIN6X4

The mouth ring designed for copper pipe, aluminum pipe, etc.
that are installed on <EMT1HA0FM Type> as the standard part.
Metal pipe having the outer diameter 6 (6 ± 0.1) can beconnected. When connecting a plastic pipe (outer diameter 6 x
inner diameter 4), detach the brass sleeve and use the optional
resin inner sleeve set (XIN6X4). (Fig. VII-(1))

This accessory is necessary when a plastic pipe (outer diameter 6
x inner diameter 4) is connected to the connector for metal pipe.
(Fig. VII-(1))

Fig. Ⅶ-(1)Inner（resin)
Sleeve（resin)
Plastic tube△！

CAUTION- Tighten the connector with a force of 1.2N・m.
- Be careful that tightening with an excessive force may damage the instrument.

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VIII. DISPOSAL
Disposal of the apparatus must be done according to related ordinances, laws, and regulations.
Note that lead-containing solder is used for the apparatus.

IX. REGULAR CALIBRATION
To maintain the service life and reliability of an instrument in general, it is important not to apply any stress caused byexternal factors to the apparatus. With the apparatus, no special maintenance service is required when it is adequately usedaccording to the operating instructions manual. However, it is recommended to execute the regular calibration once a year.
For the regular calibration, contact our distributor or Yamamoto Electric Works Co., Ltd.

X. 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
one of 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 otherthan described 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 thedesign of the 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 producthas 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
not intended 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.

<Note>The specifications and contents of the product described in the operating instruction manual may subject to change without noticefor further improvement.

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