EMT1H

Manostar transmitter
List ofproducts

WO81

EMT1H
Type examination pass No. CML 19JPN2072X

Intrinsically safe fine differential pressure transmitter
Explosion-proof performance

WO71

FR51A

MS99

RoHS

Ex ia ⅡC T4 Ga

Intrinsically safe refers to a model with a structure designed inconsideration of the necessary safety factors so that combustible
gas will not be ignited because of an electric spark generated
under normal conditions or in the event of an accident or
temperature rise, whose explosion-proof safety has been verified
through tests or by other means by an official organization.

MS99S

MS61A-RA

QDP33

EMD8A

EMD7

EMT1

EMTGP1

EMT1H

EMT1H

EMT6

(Manostar transmitter + safety barrier)

EMP5A

EMRT1

Product code

HWS15A<Main application fields>

Accessories
Application

Precautions
Maintenance• General factory management
equipment• Negative pressure for dust
collector/differential pressure of airconditioners• Filter pressure loss management• Precision machine manufacturingline• Building air-conditioning control
equipment<Usage>• Detection of clogging of air filter• Room pressure measurement in aclean room• Measurement of clogging of bugfilter• Measurement of dynamic pressure
at ventilation/exhaust device*(Refer to pages 114 to 117)

85

EMT1H

APressure range code0FM

D100(Example)
Range
Unit
Base
OutputExternal shape

Maximum value(for ± range, provide “±” as well)

DEPaFV
FMFor vinyl pipe

0Two-wire type 4–20 mA DCA

For indoor drip-proofkPa
For metallic pipe

◆When making an inquiry or placing an order, specify the above product code.
◆The above product code is for the set of fine differential pressure transmitter and safety barrier.
◆When you use this product for airflow rate/airflow speed measurements, we need to obtain the specifications of thepressure detection side.
Fill out the airflow rate/airflow speed specification document preparation sheet on page 15, and inform us of the data.

EMT1H

Manostar transmitter
EMT1H

List ofproducts

System specifications
Model
Configuration
Explosion-proof type
Target gas
Intrinsically safe
circuit

WO81

EMT1H
Manostar transmitter EMT1H + safety barrier MTL7787+
Intrinsically safe structure
Ex ia IIC T4 Ga
Conditions for wiring in the section between EMT1H and safety barrier (MTL7787+)
Capacitance (CC): 0.05 μF or lower
Wiring resistance: 10 Ω or lower
Cross section area of electric wire conductor: 0.5 to 2.5 mm2
Inductance (Lc): 2.00 mH or lower

WO71

FR51A

EMT1H
Pressure unit
Pressuremeasurement method
Measured gas
Pressure-receiving
element
Exterior material
Instrument bodywithstanding
pressure
Mounting orientation
Electric signal
conversion method
Insulation resistanceWithstand voltage
Operating ambient
temperature
Operating ambient
humidityPa, kPa
Differential pressure method
Air and noncorrosive gas (liquid cannot be measured)
Diaphragm (silicone rubber)
Aluminum die casting Painting on exterior (paint color: gray)
500 kPa (refer to page 118)

Durable vibration

5 to 10 Hz, amplitude of 10 mm,
10 to 50 Hz, acceleration of 39 m/s2 (two hours each forthree axial directions)

Durable impact

100 m/s2 (six times each for three axial directions)Compatible pipe

• Vinyl pipe or rubber pipe (inner diameter of 6 mm)……Compatible with base for vinyl pipe
• Metallic pipe (outer diameter of 6 ± 0.1 mm)……Compatible with base for metallic pipe
• Hard tube (outer diameter 6 × inner diameter 4 mm)……Separately sold inner sleeve set (XIN 6 × 4;
refer to page 111) is necessary for the base formetallic pipe.

MS61A-RA

Approx. 1100 g

QDP33

Horizontal (inclination angle of within ± 5°)
Variable inductance
Between power terminal and grounding terminal: 20 MΩ orhigher (500 V DC megger)
Between power terminal and grounding terminal: 500 V AC,
50/60 Hz, for one minute, 1 mA or lower
0°C to 40°C (no freezing allowed)

Mass

MS99S

EMD8A

90% RH or below (no condensation allowed)

MTL7787＋

EMD7

Intrinsically safe circuit
maximum voltage

28 V

Intrinsically safe circuit
maximum current

93 mA

Intrinsically safe circuit
maximum power

0.65 W

MassApprox. 140 g

Pressure range code

MS99

Non-intrinsically safe
circuitTolerable voltage

Pressure range

Accuracy(at 20°C)

Temperature
characteristics(zero + span)
at 0°C to 40°C

250 V AC, 50/60 Hz, 250 V DC

EMT1

Withstanding pressureof pressure-receiving
element

EMTGP1
Output and transmission method

D 10
D 15
D 20
D 30

0–10 Pa
0–15 Pa
0–20 Pa
0–30 Pa

D 50
D 75
D 100
D 150
D 200
D 300
D 500
D 750
D1000

0–50 Pa
0–75 Pa
0–100 Pa
0–150 Pa
0–200 Pa
0–300 Pa
0–500 Pa
0–750 Pa
0–1000 Pa

E 1

0–1 kPa

E 2
E 3
E 5
E 10
E 20

0–2 kPa
0–3 kPa
0–5 kPa
0–10 kPa
0–20 kPa

40 kPaE 30
E 50

0–30 kPa
0–50 kPa

100 kPa

Precautions

E 100

0–100 kPa

150 kPa

Maintenance

EMT1H±2％ FS±0.2％ FS/°C

EMT6

EMP5A

10 kPa

±1％ FS

D＋－ 10D＋－ 20D＋－ 30−10 to +10 Pa−20 to +20 Pa−30 to +30 Pa±2％ FS

D＋－ 50
D＋－100−50 to +50 Pa−100 to +100 Pa±1％ FS

Two-wire type:Output signal of 4 to 20 mA DC(load resistance of 250 Ω orlower *1)
Power voltage of 24 V DC ± 10%(ripple of 0.2 V P-P or lower)±0.1％ FS/°C*1
Resistance value of connectableload when combined with thesupplied safety barrier

EMRT1

HWS15A

Accessories
Application±0.2％ FS/°C
10 kPa
±0.1％ FS/°C◆Use of this product in a mounting orientation other than horizontal orientation is impossible.
◆For the use environment, refer to page 118.

86

EMT1H

Manostar transmitterWO81

WO71

EMT1H
External dimension drawing
EMT1H (for vinyl pipe)
100

FR51A

4×M4 screw formounting cover

4×φ5 slotted hole
for mounting use

88

Panel cutting
88±0.3

105

116

100

MS99

MS99S

MTL7787＋116±0.3

List ofproductsBase（LOW）

Terminal on hazardous
location side

Terminal on safe
location side

12.6

4×φ5 or 4×M4Base（HIGH）

Use this product by attaching acover so that the specificationsof IP20 are satisfied.

Electric wire outlet(G1/2 internal thread)

90

MS61A-RACover

EMD8A

ＧＨＨＩＬＯＷ3255

EMTGP1EMT1H%LDVHGSUHVVXUHUDQJH
201240EMT6=HURFHQWHUUDQJH
2XWSXWVLJQDO P$

Transmission output diagram(pressure-output signal)

2XWSXWVLJQDO P$

EMT17Leadplate

EMD791

115

QDP33

50

2012100450

3UHVVXUH )6050

3UHVVXUH )6

Terminal connection diagram
EMP5A

EMRT1

HWS15A

Hazardous location Non-hazardous location
EPL：GaOperating ambient
temperature: 0°C to 40°C
Safety holder
Fine differential(Safety barrier)pressure transmitter

When used in combination with the supplied safetybarrier and our receiving instrument

（＋）
（＋）
33
Intrinsically
EMT1H （－） safe circuit（－）
44

Because our receiving instrument has a built-in DC power circuit
for fine differential pressure transmitter, a separately installed DC
power source is not necessary.

EPrecautions
Maintenance（＋）
Class D grounding

When used in combination with the supplied safetybarrier and external 24 V DC power source

Hazardous location Non-hazardous location
EPL：GaOperating ambient
temperature: 0°C to 40°C
Safety holder
Fine differential(Safety barrier)pressure transmitter• Use a 24 V DC power source that has a constant voltage and aripple of 0.2 V P-P or lower.
• Connect the DV terminal of the DC power source to the grounding
terminal of the barrier as much as possible.
• The load resistance must be 250 Ω or lower.
◆For details of combination of the fine differential pressuretransmitter with our receiving instrument, adjustment meter, orother device, refer to page 113.

E3（＋）
（＋）
3
Intrinsically

44Class D grounding！

918Class A grounding

EMT1H （－） safe circuit（－）

Caution

87（＋）

（＋）
（ー）
1
10
Non-intrinsicallysafecircuit（－）
（－）
2
19

*When using EMP5, an input resistance of 50 Ω is necessary
between 18 and 19.

Accessories
Application

Receiving
instrument（EMP5/EMP5A）

24 V DCpower source

（＋）
（＋）
1
Non-intrinsicallysafecircuit（－）（－）
2Class A
groundingReceiving device(load resistanceof 250 Ω or lower)

Terminal screw tightening torque: 1.0 to 1.3 N·m
Do not tighten to a torque that exceeds the specified value because
doing so breaks the instrument body.

EMT1H

Manostar transmitter
EMT1HList ofproducts

WO81

Notes on use• Never change the constituting parts and the circuit.
This instrument has an intrinsically safe structure. The intrinsically safe structure has a higher reliability compared to other explosion-proof structures, but
failure to follow the preconditions for the explosion-proof structure significantly decreases the reliability and makes it impossible to maintain the explosionproof performance. When using this instrument, be sure to observe the following precautions.
For details of explosion-proof properties, refer to the following reference documents.

WO71

Reference documents• Recommended Practices for Explosion-protected Electrical Installations in General Industries JNIOSH-TR-46-1: 2015, published by the Technology
Institution of Industrial Safety• Recommended Practices for Explosion-protected Electrical Installations in General Industries JNIOSH-TR-46-6: 2015, published by the Technology
Institution of Industrial Safety• USERS’ GUIDELINES for Installations for Explosive Atmospheres in General Industry JNIOSH-TR-NO.44, published by the Technology Institution ofIndustrial Safety• Be sure to house the safety barrier in a container with a totally closed structure, and place it at a non-hazardous location.

！
Warning

FR51A

MS99

Grounding• Solely conduct grounding of the safety barrier in accordance with the Class A grounding work.
• Conduct grounding of the fine differential pressure transmitter body in accordance with the Class D grounding work.
• In actual grounding work, refer to “Recommended Practices for Explosion-Protected Electrical Installations in General Industries.”

MS99S

Wiring

The electric circuit of this instrument has restricted capacitances and inductances so as not to accumulate energy, which could serve as an ignition source.
However, because the capacitance and inductance generated in the wiring (intrinsically safe circuit) from the instrument to the safety barrier vary dependingon the installation environment, they need to be restricted to the tolerance value or lower by the user.
Conditions for wiring in the section between EMT1H and safety barrier (MTL7787+)
Capacitance (Cc): 0.05 μF or lower
Inductance (Lc): 2.00 mH or lower
Wiring resistance: 10 Ω or lower
Cross section area of electric wire conductor: 0.5 to 2.5 mm2*Because it is difficult to adjust a wiring cable after it has been wired, we recommend that you actually measure the capacitance and inductance of the cable
to be used in advance to obtain the approximate conditions for the cable, and then conduct the work.
• Conduct wiring as per terminal connection diagram, and after the wiring, be sure to make sure that there is no wrong wiring.
• For wiring and piping, use highly reliable parts.
• Concerning wiring, refer to “USERS’ GUIDELINES for Installations for Explosive Atmospheres in General Industry NIOSH-TR-NO.44” as it provides detailed
explanations in accordance with the installation environment.

MS61A-RA

QDP33

EMD8A

EMD7

EMT1H accessories
DIN rail set for safety barrier

Metallic cable gland (made of ZDC or FCD)

Schematic figure ofmounted DIN rail

EMT1

Non-compliant with RoHSEMTGP1

Item number

DIN-T1H

Use this DIN rail set to solely conduct grounding of
the attached safety barrier in accordance with theClass A grounding work. It is possible to install up tofive safety barriers.

Itemnumber

Color of rubberbushingSC4-1TSC4-2TSC4-3T

GrayBlackRed

Outer diameter of compatible
electric wire (mm)EMT1HMinimum Maximum

3．
56．
58．
5

7．
0
9．
0
11．
0

EMT6

This is used when the wiring of fine differential pressuretransmitter is conducted with instrumentation cables. By
paying attention to the finish outer diameter of the cable to be
used, select a metallic cable gland in a size that allows therubber bushing to retain the cable outer diameter when the cap
nut is tightened. Use a cable equipped with shield.

EMP5A

EMRT1

◆EMT1H accessories are shared with EMT1.

Bracket for mounting on vertical wall surface (horizontal mounting）*Mounting screw is not included.

1.68×φ5 fine differential pressuretransmitter mounting hole

Accessories
0.5 m ormore

4×φ7 wall surface
mounting hole

135
Item number

BRKT‒T1GP1

MaterialApplication
Vertical wall surface

1101001355525φ30 (hole)

HWS15A

Precautions
Maintenance

Steel*For quality improvement or for another reason, part of the specifications may be subject to change without prior notice.

88

Warranty■Warranty period
The warranty period for our product is one (1) year from delivery to the location specified by the orderer who makes a direct transaction
with us.

■Scope of warrantyIf any failure or defect attributable to us becomes clear during the above warranty period, we will repair the product or supply asubstitute product free of charge. However, even during the warranty period, we will exclude the product from the scope of the warranty
if the failure or defect corresponds to any of the following:(1) The failure or defect was caused by an unreasonable condition, environment, handling, or usage not mentioned in theinstruction manual, specifications, and our product catalog.
(2) The failure or defect was caused by a factor other than our product.
(3) The failure or defect was caused by a modification or repair conducted by a party other than us.
(4) The failure or defect was caused by an event that could not be foreseen at the scientific and technical levels at the time ofproduct shipment from us.
(5) The failure or defect was caused by an external factor not attributable to us, such as acts of God and disasters.
Please note that the warranty mentioned here means the warranty for our individual product, and damage provoked by a failure or
defect of the product is excluded from the scope of the warranty.
*This warranty is valid only in Japan.

Application and usage
Our products are designed and manufactured as general-purpose instruments for general industries.
Therefore, our products are not intended for the following uses, and our products used in such a manner are outside the scope ofapplication.
(1) Equipment that is anticipated to greatly affect lives and properties, such as nuclear power generation, aviation, railways, marine
vessels, vehicles, and medical devices(2) Utilities that include electricity, gas, and service water(3) Use in outdoor locations and under similar conditions or environments other than those stipulated in the instruction manual(4) Usage to which considerable safety consideration and attention equivalent to (1) and (2) above need to be given

Service■Scope of service
Because the product price does not include service expenses, such as the dispatch of engineers, we will separately charge for theexpenses in the following cases:(1) Instruction for installation and adjustment and a witnessed test run(2) Maintenance inspection, adjustments, and repairs(3) Technical guidance and technical education(4) Witnessed inspections of products at our factory<<Note>> The product specifications and information in this catalog are subject to change without prior notice for product improvement orother reasons.

●For order placement, contact

Generalagent

Manostar Shop Co., Ltd.

1-2-3 Nishishiriike-cho, Nagata-ku, Kobe City, Hyogo 653-0031
TEL. +81-78-621-7000 FAX. +81-78-621-7788

Manufacturer

Yamamoto Electric Works Co., Ltd.

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

SEPTEMBER 2021 YAMAMOTO ELECTRIC WORKS CO., LTD., JAPAN