FR51A

Manostar gauge
List ofproducts

WO81

FR51A
Utility model registration No. 2027772

Edgewise type fine differential pressure gauge

RoHS• Small-size/lightweight type that can be installed anywhere you like
WO71

FR51A

• Unique mechanism less subject to abnormal high pressure inrush• High-performance silicone rubber diaphragm with small hysteresis• Band-link mechanism that prevents the pointer from vibrating

MS99

MS99S

MS61A-RA

QDP33

Model FR51AHV(Horizontal scale type)

EMD8A

EMD7

EMT1

EMTGP1

EMT1H

EMT6

Model FR51AVV(Vertical scale type)Model FR51ACV(Color-coded horizontal scale type)

EMP5A

EMRT1

HWS15A

Accessories
Application

Precautions
Maintenance<Main application fields>• Part of semiconductor
manufacturing equipment• Negative pressure for dust
collector/differential pressure of airconditioner• Filter pressure loss management• Precision machine manufacturingline• General factory management
equipment

FR51A

Ｈ Ｖ

Pressure range code50

Ｄ Ｖ(Example)
Mountingorientation

ＶＨ
None

Unit

<Usage>• Measurement of internal pressure ofindoor device• Detection of clogging of air filter• Measurement of clogging of bugfilter• Measurement of dynamic pressure
at ventilation/exhaust device• Room pressure measurement in aclean room*(Refer to pages 114 to 117)31

Product code

Range

ＤＥ

Range for specification ofvertical mounting
Range for specification ofhorizontal mounting
Range for arbitrary mounting

PakPa

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

Base
External
shape◆When making an inquiry or placing an order, specify the above
product code.

ＶFor vinyl pipe

ＨＶＣHorizontal scale type
Vertical scale type
Color-coded horizontal scaletypeFR51A

Manostar gauge
FR51A

List ofproducts

Specifications

WO81
Horizontal scale type

Model

Vertical scale type

FR51AHV

Pressure unit
Pressure measurement
methodPressure-receiving
element
Measured gas
Scale shape
Operating ambient
temperature
Operating ambient
humidity
Instrument bodywithstanding
pressure

Color-coded horizontal scale type

FR51AVVPa, kPa
Differential pressure method

FR51ACV

Exterior material

Polycarbonate

Durable vibration

5 to 10 Hz, amplitude of 10 mm,

WO71

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

Diaphragm
Air and noncorrosive gas (liquid cannot be measured)
Edgewise shape (scale length: approx. 45 mm)−10℃ to +50℃ (no freezing allowed)
90% RH or below (no condensation allowed)
50 kPa (refer to page 118)

Durable impact

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

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

Base part

Integrated with main bodyBase polarity

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

MassApprox. 90 gFR51A

MS99

MS99S

Accessories

Mounting nut set

Pressure range
code

Mounting orientation(Refer to below)

Pressure range

50 DH

100 DH200 D

0–200 Pa

300 D

0–300 Pa

500 D

0–500 Pa

1000 D

0–1000 Pa

2E

0–2 kPa3E

0–3 kPa5E

0–5 kPa＋－ 50 DH＋－100 D

QDP33

Upright (specification)

EMD8A

From horizontal throughupright to downward andhorizontal

EMD7±2.5％ FS

Silicone rubber

20 kPaArbitrary mounting

EMT1

Horizontal (specification)

EMTGP1

Upright (specification)
From horizontal through uprightto downward and horizontal−100 to +100 Pa

EMT1H

Arbitrary mounting(Note) Accuracy in full span (refer to page121)◆For use environment, refer to page 118.

EMT6

Mounting orientation and range

EMP5A

Range for the specification of horizontal andupright mounting

Range for mounting orientation arbitrary mounting in the range
from horizontal through upright to downward and horizontalWR3DWR3DíWR3D:KROHUDQJHRWKHUWKDQRQWKHOHIW,WLVQHFHVVDU\WRVSHFLI\WKHPRXQWLQJ
RULHQWDWLRQ KRUL]RQWDOXSULJKWDQGRWKHUV 
DWWKHWLPHRIRUGHUSODFHPHQW

&DQEHDUELWUDULO\PRXQWHGDWDQDQJOH
LQWKHUDQJHIURPKRUL]RQWDOWKURXJKXSULJKWWRGRZQZDUGDQGKRUL]RQWDO

8SULJKWSODQH
10° 10°8SULJKWSODQH

HWS15A

Accessories

45°

$UELWUDU\P
RXQW
LQJ
LQW

180°

0°

Application

Precautions+RUL]RQWDOSODQHMaintenance

10°

10°

45°

90°

5°+RUL]RQWDO
SODQH

10°

0°

10°

5°
180°+RUL]RQWDO

13132W
KHU

90°

EMRT1KRUL]RQWDOWKURXJKXSUL
JKW
IURP
WRG
QJH
DU
RKH

QWDO
GKRUL]RGDQ
ZDU
ZQ

2W

UKH



Upright 

MS61A-RA

Horizontal (specification)−50 to +50 Pa＋－ 50 DVWithstanding pressure ofpressure-receiving element(Refer to page 118)

Upright (specification)

0–100 Pa

100 DV

Pressure-receiving
element material

Horizontal (specification)

0–50 Pa

50 DV

Accuracy (Note)(at 23℃ )32

FR51A

Manostar gauge
List ofproducts

WO81

FR51A
External dimension drawing
Model FR51AHV (horizontal scale type)(vertical scale type)

70
60
39

WO71
φ5.570±0.3
2×φ423±0.3

FR51A

Model FR51AVV

71MS99îＭPRXQWLQJ
VFUHZV

61±0.385MS99S

3DQHOFXWWLQJ
14MS61A-RA

The external dimensions ofmodel FR51AVV are same

QDP33

as those of model FR51AHV.

80

6SDFHUQXW2×φ4)ODWZDVKHU
6SULQJZDVKHUEMT1EMTGP1！
Caution

EMT1H

EMT661±0.3=HURSRLQWVHWWLQJGHYLFH

0D[LPXPSDQHOWKLFNQHVV
PP

70±0.3

EMD72226

EMD8A

0QXW• Do not remove the spacer nut because doing so may break the gauge.
• M3 nut tightening torque: 0.8 N·m
Do not tighten to a torque that exceeds the specified value because doing so breaks theinstrument body.

23±0.3

Overview of structure

EMP5A
361

EMRT1
4HWS15A

Accessories
Application

Precautions
Maintenance

33

NumberName

1

Transparent cover

2Base

3

Grill

4

Scale plate

5Diaphragm6

Pointer
Zero point setting
device77/RZSUHVVXUHVLGHEDVH
52+LJKSUHVVXUHVLGHEDVH

FR51A

Manostar gauge
FR51A

List of scales

List ofproducts

Model FR51AHV/CV (horizontal scale type)

WO81

Biased pressure range
01002030

Pa

40500200

400

FR51A

Pressure range
0–50 Pa

Minimum scale
5 Pa

2060

40

Zero center range

Pa（Actual size）

80

100

Pressure range
0–1000 Pa

0.50

Minimum scale
10 Pa

600

800

1000−50

Minimum scale
100 PaPressure range
0–2 kPa

4020

FR51A

1kPa

FR51A

Pressure range
0–100 Pa

Pa0Pa

Pressure range−50 to +50 Pa

1.52-10050

FR51A

Minimum scale
0.1 kPa

2040 ＋50
F R5 1 A

Minimum scale
10 Pa0Pa

Pressure range−100 to +100 Pa

WO71

50

FR51AMS99+100MS99SF R5 1 A

Minimum scale
10 Pa

MS61A-RA

QDP33
500100Pa

Pressure range
0–200 Pa

1000PaPressure range
0–300 Pa

0100200Pa

Pressure range
0–500 Pa

150

10200

Minimum scale
10 Pa

Pressure range
0–3 kPa

200

0300

1

FR51A

Minimum scale
20 Pa

300

23
FR51A

EMD8A

Minimum scale
0.2 kPakPa

Pressure range
0–5 kPa

4002kPa

FR51A

3

Color-coded horizontal scale

45FR51A

F R5 1 A

Minimum scale
0.5 kPa

Pressure range
Biased pressure
range target
0Color coding
GreenYellow Red
50％FS 75％FS

EMD7EMT1EMTGP1

EMT1H

500
FR51A

Minimum scale
50 Pa

EMT6

EMP5A

Model FR51AVV (vertical scale type)

Biased pressure range
Pa50

Pa100

Pa200

Zero center range
Pa300

Pa500

Pa1000kPa
2kPa
3kPa
5Pa＋50

Pa+100

EMRT1

HWS15A

40
40
30

80

400

150
200

60

300

800

2040

10

20002600

100

41.5

20
31100

50

200

400

100

200

0

00.5

Accessories
Application

01

5002
20
150

Precautions
Maintenance

40
00000

−50-100

FR 5 1 A

FR51A

FR51A

FR51A

FR51A

FR51A

FR51A

FR51A

FR51A

FR51A

F R5 1 APressure range
0–50 Pa

Pressure range
0–100 Pa

Pressure range
0–200 Pa

Pressure range
0–300 Pa

Pressure range
0–500 Pa

Pressure range
0–1000 Pa

Pressure range
0–2 kPa

Pressure range
0–3 kPa

Pressure range
0–5 kPa

Pressure range−50 to +50 Pa

Pressure range−100 to +100 Pa

34

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, 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, contactGeneralagent

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