WO71

Manostar gauge
List ofproducts

WO81

WO71
RoHS

Small-sized fine differential pressure gauge FS type/PS type
• A memory pointer, which is convenient for setting of index for planned differential pressure value or

WO71

FR51A

MS99

limit value, is equipped as standard.
• Allows various pipe connections.
• Only by exchanging the base on the high-pressure side with that on the low pressure side, it ispossible to change the polarity. *For side face piping only

Flat-type fine differential pressure gauge N type/R type• The lowest master gauge thickness of 29.2 mm has been achieved.

MS99S• Thin design and standard equipment of rotary base make it possible to conduct smart piping.

MS61A-RA

QDP33

EMD8A

EMD7

EMT1

Model WO71FS

Model WO71PS(surface type w/VT base and memory pointer)(square panel type w/VT base and memory pointer)

EMTGP1

EMT1H

EMT6

EMP5A

EMRT1

Model WO71N

HWS15A

Accessories
Application

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

23

Model WO71R(surface type/round panel type w/rotary base)(square panel type w/rotary base)Product code

Pressure range code

WO71

1000

N

D

V

(Example)
Mountingorientation

Unit
Range
External
shape

V
H
S

Upright

D
E

Pa

Horizontal
Other
kPa

Maximum scale value

FS
PS
N
R

Surface type w/VT base and memory pointerSquare panel type w/VT base and memory pointerCommon to surface type and round panel type, w/rotary
base

Square panel type w/rotary base

◆When making an inquiry or placing an order, specify the above product code.

WO71

Manostar gauge
WO71

List ofproducts

Specifications

WO81

Surface type w/VT base andmemory pointer

Model

Square panel type w/VT base Common to surface type andround panel type, w/rotary baseand memory pointer

WO71FS
Pressure unit
Pressuremeasurement
methodPressure-receiving
element
Measured gas
Scale indication
angle
Operating ambient
temperature
Operating ambient
humidity
Instrument bodywithstanding
pressure
Exterior material
Durable vibration
Durable impact
Compatible pipe

WO71PS

WO71N
Base polarity

Pa, kPa
Differential pressure method

WO71R

WO71

FS type, PS type
Changeable (only for side face pipe)
Identification with red on high pressure side and blue on low
pressure side

Diaphragm

FR51A

N type, R type
 nchangeable
U
Indicating high-pressure side and low-pressure side with“H” and “L” marks, respectively on the instrument body.

Air and noncorrosive gas (liquid cannot be measured)
Approx. 70°

PS type 	Approx. 180 g

90% RH or below (no condensation allowed)

N type 	Main body: approx. 130 g, mounting plate:
approx. 40 g

50 kPa (refer to page 118)

100 D

0–100 Pa

200 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

MS99S

R type 	Approx. 150 g

Polycarbonate and polyamide
5 to 10 Hz, amplitude of 10 mm,
10 to 50 Hz, acceleration of 39 m/s2 (two hours each forthree axial directions)
100 m/s2 (six times each for three axial directions)
FS type, PS type• Vinyl pipe or rubber pipe (inner diameter of 6 mm)
Base for resin vinyl pipe (already mounted on gauge)• Metallic pipe (outer diameter of 6 ± 0.1 mm)
Separately sold base for metallic pipe is necessary.
• Hard tube (outer diameter 6 × inner diameter 4 mm)
Separately sold base for metallic pipe and inner sleeveset (refer to page 111) or push-in joint is necessary.
N type, R type• Vinyl pipe or rubber pipe (inner diameter of 4 mm)
Rotary base for resin vinyl pipe (already mounted ongauge)(main body side: M5 internal thread, depth of 4 mm)

Pressure range

MS99

FS type 	Approx. 200 g

Mass−10℃ to +50℃ (no freezing allowed)

Pressure range
code

Square panel type w/rotarybaseMounting orientation*It is necessary to specify
the orientation at thetime of order placement
for all ranges.

Accessories

FS type 	Mounting plate (already installed on main body),
custom seal

MS61A-RA

PS type Mounting nut set, custom seal
N type 	Mounting plate (already installed on main body),
mounting screw set, custom seal
R type

QDP33

Mounting nut set, custom seal

EMD8A

EMD7

EMT1

Accuracy (Note)(at 23℃)

Pressure-receiving
element material

Withstanding pressure ofpressure-receiving element(Refer to page 118)

Horizontal and upright

EMTGP1EMT1H

HorizontalorUprightor
Others

±2.5％ FS

Silicone rubber

EMT6

20 kPa

EMP5A

EMRT1

(Note) Accuracy in full span (refer to page 121)
◆For use environment, refer to page 118.

HWS15A

Mounting orientation and range

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

0 to 100 Pa

0 to 200 Pa

Whole range other than on the left

Application

0°+RUL]RQWDO+RUL]RQWDO
SODQH

V

2
WKH
U

2
WK

180°



8SULJKW
90°



Maintenance20°+RUL]RQWDO

10° 10°180°90°Precautions

V
HU
WK

+RUL]RQWDO
SODQH

UV

6° 6°

0°

+RUL]RQWDO

2W
KH  

3°3°

180°

8SULJKWSODQH
10° 10°8SULJKWSODQH
6° 6° 8SULJKW

V
HU

OH
DE

  
8
QX
V
90°

OH
DE

8Q
XV

8SULJKWSODQH
3°3° 8SULJKW+RUL]RQWDO
SODQH

24

WO71

Manostar gauge
List ofproducts

WO81

Model WO71FS
External dimension drawing
Installation of base on side face
VT base (for vinyl pipe)
119=HURSRLQWVHWWLQJGHYLFH
φ95

10

43.5

15

6HDOLQJFDS

φ7
φ91

32.5

+LJK
SUHVVXUHVLGH

3RLQWHU EODFN

QDP33:LGWKDFURVVIODWV0HPRU\SRLQWHUUHG

0HPRU\SRLQWHUVHWWLQJGHYLFH

φ95±0.3

0°
12/RZSUHVVXUH
VLGH

MS61A-RAîĳRUî0

0°

MS99

MS99S

12

12
0°

FR51A

2

3×φ5
φ105

12
0°

WO71

83

MT base (for metallic pipe)

6HDOLQJFDS

3DQHOFXWWLQJ

VR base (rotary type for vinyl pipe)
φ7:LGWKDFURVVIODWV:LGWKDFURVVIODWV
φ6±0.1&RPSDWLEOH
SLSHGLDPHWHU

EMD8A

EMD7

:LGWKDFURVVIODWV

（132）

110
123

EMT1

EMTGP1

Installation of base on rear face

3DQHOFXWWLQJ$GDSWHUIRUUHDUIDFHSLSLQJ:LGWKDFURVVIODWV

3DQHOFXWWLQJ

Mounting method0VFUHZZKHQPDNLQJDKROHLQWKHSDQHO0QXW
ZKHQDQ0LQWHUQDOWKUHDGLVPDGHLQWKHSDQHO
1XWLVQRWQHFHVVDU\Precautions
Maintenance*Mounting screw set is not supplied.

φ95±0.3

32.5
55

0°
12

2×φ18

Application

25

îĳ
RUî0

φ7

32.5$GDSWHUIRUUHDUIDFHSLSLQJ

27

R9
2×

Accessories:LGWKDFURVVIODWV:LGWKDFURVVIODWV

φ95±0.3

6HDOLQJ
FDS

0°
12

HWS15A:LGWKDFURVVIODWVVR base (rotary type for vinyl pipe)

0°
12

EMRT1

îĳ
RUî0

φ7

EMT6

EMP5A

（31）

0°

6HDOLQJ
FDS

12

16

φ6±0.1

6HDOLQJFDS

MT base (for metallic pipe)&RPSDWLEOH
SLSHGLDPHWHU

VT base (for vinyl pipe)
EMT1H

WO71

Manostar gauge
Model WO71PS

List ofproducts

External dimension drawing

WO81

VT base (for vinyl pipe)
10.3

75

2

59.4

29.1
16.3

=HURSRLQWVHWWLQJGHYLFH

WO71î0VFUHZV
6HDOLQJFDS

75 ±0.3

4×φ4

FR51A

32.5

φ7

75

92

φ

87
±

0.
3

/RZSUHVVXUH
VLGH

3RLQWHUEODFN
0HPRU\SRLQWHUVHWWLQJGHYLFH:LGWKDFURVVIODWV
0HPRU\SRLQWHU UHG

83

3DQHOFXWWLQJ

VR base (rotary type for vinyl pipe)
4639

φ6±0.1&RPSDWLEOH
SLSHGLDPHWHU

（50）

MS99

MS99S

+LJKSUHVVXUH
VLGH

MT base (for metallic pipe)

75±0.392

MS61A-RA

QDP33

EMD8A

EMD7
:LGWKDFURVVIODWV

6HDOLQJFDS

EMT1:LGWKDFURVVIODWV:LGWKDFURVVIODWV

6HDOLQJFDS

φ7

EMTGP1EMT1H

Mounting method
6XSSOLHGQXWVHW
LVXVHG

EMT6

EMP5A

EMRT1

HWS15A
0D[LPXPSDQHOWKLFNQHVVPP！
Caution

6HDOLQJFDS

Insert the gauge body to the frontof the panel, and secure the gauge
body with the supplied nut set.

• Tighten the screws and nuts to a torque of 0.8 N·m.
• Do not tighten to a torque that exceeds the specified value because
doing so breaks the gauge body.

Accessories
Application

Precautions
Maintenance

26

WO71

Manostar gauge
List ofproducts

WO81

WO71

Model WO71N
External dimension drawing=HURSRLQWVHWWLQJGHYLFH

29.2
10

î0WKUX

6.2+LJKSUHVVXUH
VLGHURWDU\EDVH

TOP
H

7

φ91

114

100

FR51A

MS99

/RZSUHVVXUH
VLGHURWDU\EDVH

L

BOTTOM

φ4.5

MS99S
3.2

0RXQWLQJSODWH

70

MS61A-RA

QDP33

Mounting method
Wall surface mounting
6XSSOLHGVFUHZVHWLVXVHGîĳ
RUî0

EMD8A

EMT1

100±0.3

EMD7

0LQWHUQDOWKUHDG)RUSHQHWUDWLRQEMTGP1

3DQHOFXWWLQJ

ZKHQPDNLQJKROHLQWKHSDQHO0QXW
ZKHQDQ0LQWHUQDOWKUHDGLVPDGHLQWKHSDQHO
1XWLVQRWQHFHVVDU\0VFUHZ

EMT1H

EMT6

Embedding in panel
6XSSOLHGVFUHZVHWLVXVHG

EMP5A

EMRT1

0.3

±

87

φ

HWS15A

Accessories

3DQHOFXWWLQJ

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

Precautions

270VFUHZ

Screw the screws into the mounting plate, andsecure the gauge body by pushing it against thepanel.

Application

Maintenance

M4<Mounting panel mounting/dismounting method>
The claw is designed to hook the gauge body.
Insert a flat-blade screwdriver into the recessed part in the figure on the right,
and push it down while lifting the mounting plate to remove the mounting plate.
To mount the mounting plate, fit the gauge body in the mounting plate byaligning the claw with the recessed part, and push the mounting plate
5HFHVVHGSDUW
upward.

TOP
H

&ODZ
BOTTOM

WO71

Manostar gauge
Model WO71R

List ofproducts

External dimension drawing
29

10.3

=HURSRLQWVHWWLQJGHYLFH

6î0VFUHZV/RZSUHVVXUH
VLGHURWDU\EDVH+LJKSUHVVXUH
VLGHURWDU\EDVH

75

92

7

H

WO71

75±0.3

4×φ4

L

φ4.5

FR51A
75±0.3

75

φ
87
±
0.
3

92

WO81

MS99

MS99S
70

3DQHOFXWWLQJ
MS61A-RA

Mounting method

QDP33

6XSSOLHGQXWVHWLVXVHG

EMD8A

0QXW
6SULQJZDVKHU)ODWZDVKHU

EMD7

EMT1

0D[LPXPSDQHOWKLFNQHVVPPEMTGP1
Insert the gauge body to the front of thepanel, and secure the gauge body withthe supplied nut set.

• Tighten the screws and nuts to a torque of 0.8 N·m.
• Do not tighten to a torque that exceeds the specified value because
doing so breaks the gauge body.

！
Caution

EMT1H

EMT6

EMP5A

Overview of structure

EMRT1
7

4

6

5

/RZSUHVVXUHVLGHEDVH

1

3

2

+LJKSUHVVXUHVLGHEDVH

NumberName

1Transparent cover

2

Housing

3

Grill

4

Scale plate

5Diaphragm

6

Pointer
Zero point setting
device7

HWS15A

Accessories
Application

Precautions
Maintenance

28

WO71

Manostar gauge
List ofproducts

WO71

List of scales

WO81

WO71

0

60

40

20

80

100

100

50

150
200

0

Pa
FR51A

Pa

Pressure range Minimum scale

0–100 Pa

Pressure range Minimum scale

5 Pa

0–200 Pa

10 Pa

MS99
200

100

MS99S

300

0

100

0

200

300

400

500

Pa
MS61A-RA

400

600

800

1000

Pa

Pa

Pressure range Minimum scale

0–300 Pa

0200

Pressure range Minimum scale

10 Pa

0–500 Pa

Pressure range Minimum scale

25 Pa

0–1000 Pa

50 Pa

QDP33
0.5

EMD8A

1

1.5

0

2

1
2

3

0

kPa
EMD7

0

2

3

4

5

kPa

kPa

Pressure range Minimum scale

0–2 kPa1

Pressure range Minimum scale

0.1 kPa

0–3 kPa

Pressure range Minimum scale

0.1 kPa

0–5 kPa

0.25 kPa

EMT1

EMTGP1

EMT1H

Accessories dedicated to WO71

RoHS

Custom seal

VR base(Auxiliary item)

EMT6

Dedicated to N type andR type(Example of customization)

Mounting plate(Auxiliary item)*ODQG
ZLGWKDFURVVIODWVDedicatedto N type(Auxiliary
item)

Item number

Material

2ULQJｉｄｗｄ

EMP5A

EMRT1

Item number

Material

KGA71VR Polycarbonate/aluminum

HWS15A

Item number

SEAL-WO71

Accessories
Application

Precautions

Material

Polyester film

It is possible to freely attach the seal on the gauge
body to color-code the scale and indicate the planned
differential pressure value and limit value.

Sealing cap(Auxiliary item)

MaintenanceItem number

KGA71PLG

Material

Polypropylene

This is already installed when
the gauge is purchased.

29

1LSSOHThis serves as an elbow whose tube mounting part
rotates. A vinyl pipe or rubber pipe with an inner diameterof 4 mm can be connected. This is already installed when
the gauge is purchased.

！
Caution• There are no high-pressure side and low-pressure
side polarities.
• As the structure allows the O-ring (2 pieces) to drop,
pay attention not to lose the O-ring at the time ofremoval of the base.

ADPL71

Steel

This is used for
mounting the gauge
body.

WO71

Manostar gauge
WO71

List ofproducts

Accessories for FS type and PS typeRoHS

VT baseHigh-pressure side

(Auxiliary
item)

WO81

VR baseLow-pressure side

(Auxiliary
item)

Highpressure
side

Lowpressure
side

WO71

FR51A
Item number

KGA81VT-H-P

Material

Polypropylene

Item number

KGA81VT-L-P

Material

Polypropylene

A vinyl pipe or rubber pipe with an inner diameter of 6 mm can beconnected. This is already installed when the gauge is purchased.

Item number

Material

KGA81VR-H

Brass

Low-pressure side

Material

KGA81VR-L

Brass

This serves as an elbow whose tube mounting part rotates. A vinyl
pipe or rubber pipe with an inner diameter of 6 mm can be connected.

MS99

PR baseMS99S

PT baseHigh-pressure side

Item number

High-pressure side

Low-pressure side

MS61A-RA

Item number

KGA81PT-H

Material

PBT/brass

Item number

KGA81PT-L

Material

PBT/brass

Item number

Material

KGA81PR-H

PBT/brass

Item number

KGA81PR-L

Material

PBT/brass

QDP33

The tube mounting part is a push-in joint. For piping, use theseparately sold tube (refer to page 112) or a tube compatible with JIS
B 8381-1. (Connectable tube outer diameter: 6 mm)

The tube mounting part is a rotary elbow push-in joint. The piping is
the same as that for the PT base. (Connectable tube outer diameter: 6
mm)

EMD8A

MT baseMR baseEMD7

High-pressure side

Low-pressure side

High-pressure side

Low-pressure side

EMT1

Item number

Material

KGA81MT-H

Brass

Item number

Material

KGA81MT-LBrass

A metallic pipe, such as copper pipe and aluminum pipe, with an outer
diameter of 6 ± 0.1 mm can be connected. However, for stainless steel
pipe, use an MTW base. When connecting with a plastic pipe (outer
diameter 6 mm × inner diameter 4 mm), remove the brass sleeve and use
the separately sold resin inner sleeve set (XIN6×4; refer to page 111).

Item number

KGA81MR-H

Brass

Item number

KGA81MR-L

Material

Adapter for rear face piping

Low-pressure side

(Dedicated to FS type
Highrear face piping)pressureside

EMTGP1

Brass

This serves as an elbow whose tube mounting part rotates. The
piping material is the same as that of MT base. When connectingwith a plastic pipe (outer diameter 6 mm × inner diameter 4 mm),remove the brass sleeve and use the separately sold resin inner
sleeve set (XIN6×4; refer to page 111).

MTW base
High-pressure side

Material(Dedicated to FS type
Lowrear face piping)pressure
side

EMT1H

EMT6

EMP5A

EMRT1

Item number

KGA81MTＷ-H-S

Material

Stainless steel

Item number

KGA81MTＷ-L-S

Material

Stainless steel

This is used to connect a stainless steel pipe with an outer
diameter of 6 ± 0.1 mm.

Item number

KGA81FBA-H

Item number

KGA81R1/8AD-H

Brass

Item number

KGA81R1/8AD-L

Item number

KGA81FBA-L

Material

Brass

Highpressure
side

Material

Brass

It is possible to connect an R1/8 joint.
*The specifications of this adapter differ from those of the adapter for rearface piping.

Item number

KGA81R1/8AD-H-S

Material

Item number

KGA81R1/8AD-L-S

Accessories
Application

Maintenance

Lowpressure
side

Stainless steel

HWS15A

Precautions

R1/8 base adapter (SUS)

Lowpressure
side

Material

Brass

When arranging an MT base on the rear face of the WO71FS type, this adapter
is required as a spacer for hooking a stabilizing wrench to the base at the timeof pipe connection. This adapter is also required when arranging the VR base or
MR base (excluding MTW base) on the rear face in order to avoid interference
between the base and panel.
When connecting an R1/8 joint, use an R1/8 base adapter.

R1/8 base adapter
Highpressure
side

Material

Material

Stainless steel

It is possible to connect an R1/8 joint.
*The specifications of this adapter differ from those of the adapter for rearface piping.

30

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 the
instruction 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 of
product 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 of
application.
(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 the
expenses 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