MS99S

Manostar switch
List ofproducts

WO81

MS99S
Type examination pass No. TC22339X

Intrinsically safe fine differential pressure switch
Explosion-proof performance

WO71

FR51A

MS99

RoHS

Ex ia ⅡC T6 Ga

Intrinsically safe refers to a model with a structure designed in consideration of thenecessary safety factor 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 temperaturerise, whose explosion-proof safety has been verified through tests or by other means by anofficial organization.
Be sure to use this instrument in combination with a safety holder (relay barrier). (Refer toMS99S

page 45)MS61A-RA

QDP33

EMD8A

EMD7

EMT1

EMTGP1Model MS99S

EMT1H(Integrated base type)

EMT6

EMP5A

EMRT1

HWS15A<Main application fields>

Accessories
Application

Precautions
Maintenance• General factory management
equipment• Negative pressure for dust
collector/differential pressure of airconditioner• Filter pressure loss management• Precision machine manufacturingline• Building air conditioning controlequipment<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)

43

Product code

MS99S

Ｈ ＶPressure range code

1000

Ｄ Ｖ(Example)
Mountingorientation

Unit
Range
Base
Scalesetting

ＶＨ

Upright

ＤＥ

Pa

HorizontalkPa

Maximum scale value

Ｖ

Integrated type

ＨＬ

Upper limit setting

Lower limit setting◆When making an inquiry or placing an order, specify the above product code.
◆There is no intrinsically safe fine differential pressure switch of the exchangeable base type.

MS99S

Manostar switch
MS99S

List ofproducts

Specifications

WO81

Specifications

Integrated base type, for upper limit setting

Integrated base type, for lower limit setting

MS99SHVMS99SLV

Pressure unit

Pa, kPa

Pressuremeasurement
methodDifferential pressure method

Pressure-receiving
element

Diaphragm

Contact material

Silver alloy/gold plating

Measured gas

Air and noncorrosive gas (liquid cannot be measured)

Pressure setting
methodSetting by dial with scale

Mounting orientation

Upright or horizontal

Operating ambient
temperature−10℃ to +60℃ (no freezing allowed)

Operating ambient
humidity

90% RH or below (no condensation allowed)

Conforming
standard

Exterior material

Polycarbonate

Precautions

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)

WO71

Insulation resistance

Between terminal and case	20 MΩ or higher (500 V DCmegger)

Withstand voltage

Between terminal and case	1500 V AC 50/60 Hz
for one minuteCompatible pipe

Vinyl pipe or rubber pipe (inner diameter of 4 mm)

Terminal screw size

M4 (mountable terminal: outer diameter of φ8 or below)

Base polarity

Indicating high-pressure side and low-pressure side with“H” and “L” marks, respectively, at the piping connection
base part.

MS99

MassApprox. 190 g

MS99S

Accessories

Cable clamp (already installed on main body), rubberbushing (two types)
RoHS directive
When using this product in a combustible gas atmosphere,
its structure must be intrinsically safe.
When using this product, be sure to mount it by attaching
the cover, cable clamp, and DIN rail mounting plate.

Explosion-proof specifications
Intrinsically safe structure (Ex ia IIC T6 Ga）

Internal inductance (Li)Ignorable value

Applicable guidanceTechnical Guideline 2015 compliance with international
standardJNIOSH-TR-46-1:2015
JNIOSH-TR-46-6:2015

Internal capacitance (Ci)Ignorable value

Equipment protection level (EPL)Ga

Protection level

IP20

Intrinsically safe circuit tolerable
voltage (Ui)14.4 V

Hazardous locations where thisproduct can be installed*

Intrinsically safe circuit tolerable
current (Ii)

30 mA

Special hazardous location
Class I hazardous location
Class II hazardous location

Intrinsically safe circuit tolerable
power (Pi)

0.11 W

Repeatability

Maximum
operatingpressuredifference±5.0 Pa±2.0 Pa

25.0 Pa

20–200 Pa±9.0 Pa±2.0 Pa

25.0 Pa

300 D

30–300 Pa±13.5 Pa

±3.0 Pa

30.0 Pa

500 D

50–500 Pa±22.5 Pa

±5.0 Pa

45.0 Pa

1000 D

100–1000 Pa±45 Pa

±10 Pa70 Pa

3E

0.3–3 kPa

±0.135 kPa±0.030 kPa

0.300 kPa

5E

0.5–5 kPa

±0.225 kPa±0.050 kPa

0.450 kPa

10 E

1–10 kPa±0.45 kPa

±0.10 kPa

0.70 kPa

30 E

3–30 kPa±1.35 kPa

±0.30 kPa

3.00 kPa

120 D

20–120 Pa

200 D

Mounting orientation*It is necessary to specify theorientation at the time oforder placement for allranges.

HorizontalorUpright◆For an overview of the structure, refer to page 38.
◆For contact and other materials, refer to page 42.
◆For the use environment, refer to page 118.

EMT1

12 V DC

Specifications
Contact configuration
SPDT (single-pole
double-throw)
Electric service life
100,000 times or more

Scale setting
accuracy(at 23°C)

Pressure-receiving
element material

Withstanding pressuresof instrument body andpressure-receiving element(Refer to page 118)EMTGP1

EMT1H

EMT610 kPa

EMP5A
Silicone rubber

EMRT120 kPa

50 kPa

HWS15A

Accessories
Application

Opening/closing capability
Rated voltage

QDP33

EMD7

*In all hazardous locations, positively prevent generation of spark, which could be an ignition source, due to impact or friction on this instrument.

Pressure range

MS61A-RA

EMD8A

Explosion-proof performance

Pressure range code

FR51A

Resistance load

Precautions
Maintenance

30 mA

44

MS99S

Manostar switch

21MS99S

11MS61A-RA

QDP33

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40FR51A

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84

WO71

External dimension drawing

106.5

WO81

MS99S

36

List ofproducts

6FDOH&DEOHFODPS

φ4.5

78

48
57

812.5

33
35

EMD8A

EMD7Mounting orientation and range It is necessary to specify the orientation at the time of order placement for all ranges.

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VD

EMT1H

90°

H
EO

0°5°5°

EMT6+RUL]RQWDOSODQH

EMP5A

EMRT1Terminal connection part
HWS15A

Accessories
Application

Precautions
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Recommended safety holder• Contact signal converter EB3C series (IDEC Corporation)• Barrier relay system TBR-100 series (Takenaka Electronic Industrial Co., Ltd.)45•	Safety holders that can be connected to this product are limited tosuch safety holders that have passed the type examination as soledevices and satisfy the following conditions.
Performance category: ia
Group: IIC
Uo ≤ 14.4 V
Io ≤ 30 mA
Po ≤ 0.11 W•	For external wiring of the intrinsically safe circuit, use such wires thatsatisfy the wiring conditions for the safety holder.
Lo ≥ Lc Lc:	inductance of external wiring of the intrinsically safe
circuitCo ≥ Cc Cc:	c apacitance of external wiring of the intrinsically safe
circuit*The internal inductance and internal capacitance of this product are notconsidered because they are ignorable values.
•	Route the wires of the intrinsically safe circuit such that the voltage
and current that may impair the intrinsic safety of the intrinsicallysafe circuit are not induced on the intrinsically safe circuit byelectromagnetic induction and electrostatic induction.

MS99S

Manostar switch
MS99S

List ofproducts

Accessories dedicated to MS99RoHS

WO81

Cable clamp holder(Auxiliary item)

WO71

FR51A
This is already installed at the time of purchase ofthe instrument.
Item number

MS99

Material

ADPA-MS99

Polycarbonate

MS99S

Cable clamp (Ohm Electric Co., Ltd.)
Mounting hole diameter: φ15
Mounting screw: M15 P=1[Schematic figure of mounted cable clamp]
Only by changing the orientation of the transparent cover is it
possible to change the wiring direction.

MS61A-RA

QDP33

EMD8A

On the model MS99S, the OA-W15M-05 isequipped as standard, and rubber bushings OAW15M-04 and OA-W15M-07 are attached as oneeach.

EMD7

Item number

Compatible electric
wire diameter

Material

OA-W15M-04
OA-W15M-05
OA-W15M-07

φ2–4
φ3–5
φ5–7

Nylon 66
Polypropylene
NBR！

EMT1

In mounting of the cable clamp to the instrument body, the supplied locknut is not used.

CautionAccessories dedicated to S typeRoHS

EMTGP1

EMT1H

DIN rail mounting plate(Auxiliary item)

EMT6

EMP5A

EMRT1
This is already installed at the time of purchase of the instrument.
Item number

ADPL99S-DIN

HWS15A

Material

Polyacetal/steel

Accessories

DIN rail set[Schematic figure of mounted DIN rail]

Application

105

Precautions

Item number

DIN-99S

Material

Aluminum/steel

Maintenance3546

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 warranty
If 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, marinevessels, 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

ManufacturerYamamoto 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