WO81

Manostar gauge
List ofproducts

WO81 Airflow rate/airflow speed meter
RoHSWO81
This page and the following page introduce the WO81 airflow rate/airflow speed meters.
For WO81 fine differential pressure gauges, refer to page 11.

WO71

Display units
ｍ3 /h
MS99

ｍ3 /h

ｍ3 /h

ｍ3 /minｍ3 /minｍ3 /min×10（nor）

ｍ3 /h

ｍ3 /min

ｍ /h

ｍ /h

ｍ /minｍ3 /h

ｍ3 /min

×1000

ｍ3 /h

×10000MS61A-RA（nor）

×10
3MS99S

3×1000（nor）
×10000（nor）

Product code

EMD8A

WO81

ＦＮ49DMＶ

EMT1

EMTGP1×10（nor）

×10

ｍ3 /min

3×1000（nor）

×1000

ｍ3 /min×10000（nor）

×10000(Example)

ＶＨ

Mountingorientation

Range for arbitrary mounting

UnitDMEM

Airflow rate/speed unit (dynamicpressure Pa)
Airflow rate/speed unit (dynamicpressure kPa)

Range

Airflow rate/airflow speed meter pressure
range
Pressure range based on specification
document

External
shapeEMT6◆When making an inquiry or placing an order, specify the above product code.

ＮＳＴ

No memory pointer

ＦPCPR

Surface type

Single memory pointer
Double memory pointers

Round panel typeSquare panel typeTo procure an airflow rate/speed meter, it is necessary to first prepare a specification document and check it.
Because we will prepare a specification document, please fill in (1) or (2) in the sheet below and let us know the specifications.

Airflow rate/airflow speed specification document preparation sheet

HWS15A

Pressure
detector

Duct size□Overall/static pressure
tube (Pitot tube)□Round type□Total pressure tube +static pressure tube

□Square type

*Select any of the following.

①Application

Procuring device
based on useconditions*Select any of the following, and enter
the desired values in the squares
below.

Inner diameterx

Specified airflow rate(speed)

Measured gas density*Indicate the unit as well.

*Select any of the following, and enter thedesired values in the squares below.

Normal flow rate (speed) value:□Standard air density: 1.198 kg/m

Maximum flow rate (speed)
mmvalue:□Mixed gas density:

kg/m3□When gas density is unknown
Measured gas temperature:℃Measured gas humidity:％ RH
Static pressure at measurement

Maintenancepoint:②

Procuring device basedon relationship between
airflow rate (speed) andpressure

3mm□Composite Pitot tube
(Aero eye, etc.)

Precautions

When the airflow rate (speed) is, the airflow rate (speed) up toPa.
conversion condition of dynamic pressure of◆The maximum airflow rate/speed scale value is applied after rounding it to our scale value.

15

Range for specification ofvertical mounting
Range for specification ofhorizontal mounting

None

Memorypointer

EMT1H

Accessories

ｍ/s

Pressure range code

EMD7

EMRT1（nor）

WO81 airflow rate meter

QDP33

EMP5A

Airflowspeed meter

Airflow rate meter

FR51APa

is measured with theWO81

Manostar gauge
WO81

Airflow rate/airflow speed meter

Specifications
ModelUnit
Pressure measurement
methodPressure-receivingelement
Measured gas
Scale indication angle
Operating ambient
temperature
Operating ambient
humidity
Instrument bodywithstanding pressure
Exterior material
Durable impact
Durable vibration

Accessories
Pressure range code

49 DMH
49 DMV
70 DMH
70 DMV
100 DMH100 DMV
130 DMH130 DMV180 DMH180 DMV250 DM
300 DM
400 DM
580 DM
1000 DM
1．
8 EM
3．
2 EM
4．
5 EM
8．
5 EM
10 EM

Main bodyMemory pointerNo memory pointerＮSingle memory pointer (red)Ｓ
Double memory pointers (one each for red and green)
ＴAirflow rate/airflow speed
Differential pressure method

List ofproducts

Surface typeＦ
WO81FN
WO81FSWO81FT

Round panel typePC
WO81PCN
WO81PCS
WO81PCT

Compatible pipe

• 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 plastic pipe (outer diameter 6 mm × inner diameter 4 mm)……Separately sold base for metallic pipe and inner sleeveset (refer to page 111) or push-in joint is necessary.

Diaphragm
Air and noncorrosive gas (liquid cannot be measured)Wide-angle indication of approx. 270 degrees−10℃ to +50℃ (no freezing allowed)
90% RH or below (no condensation allowed)

Base polarity• Identification with red on high pressure side and blue on low
pressure side• By exchanging the base on the high-pressure side with that on
the low pressure side, it is possible to change the polarity.

MassApprox. 270 g

200 kPa (refer to page 118)
Polycarbonate and polyamide
100 m/s2 (six times each for three axial directions)
5 to 10 Hz Amplitude of 10 mm,
10 to 50 Hz Acceleration of 39 m/s2 (two hours each for three axialdirections)

Square panel typePR
WO81PRN
WO81PRS
WO81PRT

WO71

FR51A

MS99

MS99S

WO81F
WO81PCWO81PR
Two sets of mounting fittings (already mounted on gauge body)
Mounting nut set (already mounted on gauge body)
Mounting screw set
Withstanding pressure of pressureMounting orientationAccuracy (Note)
Pressure-receiving
Airflow rate/receiving element
airflow speed range(Refer to page 18)(at 20℃ )element material(Refer to page 118)
Horizontal (specification)
Upright (specification)
Within ± 5% FS
Horizontal (specification)
Upright (specification)
10 kPaHorizontal (specification)
Upright (specification)
Horizontal (specification)
Within ± 2.5% FS
Upright (specification)
Depends on airflow rate/
Horizontal (specification)
Upright (specification)
Silicone rubber
airflow speed scalespecification document.
Between horizontal anduprightArbitrary mounting

WO81

40 kPaMS61A-RA

QDP33

EMD8A

EMD7

EMT1

EMTGP1

Within ± 1.5% FS

EMT1H
150 kPa(Note) Value : Arbitrary (to be rounded), magnification : ×10, ×1000, ×10000, units : m3/h, m3/min, m3/h (nor), m3/min (nor), m/s(Note) Accuracy at full span of pressure value (refer to page 121)

◆For use environment, refer to page 118.

Airflow rate/airflow speed range (scale example)

EMT6

EMP5A

EMRT1

HWS15A

Accessories
Application

Precautions
Maintenance

Actual size
Airflow rate scale

Airflow speed scale16WO81

Manostar gauge
List ofproducts

WO81

Model WO81F
External dimension drawing
Installation of base on side face…………(standard condition at time of shipment from factory)

WO71

VT base (for vinyl pipe)
φ101

φ128

îĳPRXQWLQJKROH
îGLYLVLRQ

FR51A

φ114
0HPRU\SRLQWHU

MS99
0HPRU\SRLQWHU=HURSRLQWVHWWLQJGHYLFH

6HDOLQJFDS:LGWKDFURVVIODWVMS99S

MS61A-RA

3RLQWHU

QDP33

EMD8A

*UHHQPHPRU\SRLQWHUVHWWLQJGHYLFH

795HGPHPRU\SRLQWHUVHWWLQJGHYLFHîĳ KROH

EMD7RUî0WDSîGLYLVLRQ

φ769

EMT127EMTGP1φ114±0.3

138

EMT1H

3DQHOFXWWLQJ

EMT6

EMP5A

EMRT1Example of base arrangement
Installation of base on side face
MT base (for metallic pipe)

HWS15AVR base (rotary type for vinyl pipe)
φ7:LGWKDFURVVIODWV:LGWKDFURVVIODWVPrecautions（143）

φ6±0.1

Application&RPSDWLEOH
SLSHGLDPHWHU

Accessories:LGWKDFURVVIODWV121134

Maintenance！
Caution

17Base tightening torque: 1 N·m Sealing cap tightening torque: 0.5 N·mDo not tighten to a torque that exceeds the specified value because doing sobreaks the gauge body. (Refer to page 120.)

WO81

Manostar gauge
Model WO81F

List ofproducts

Installation of base on rear face
VT base (for vinyl pipe)

WO81

MT base (for metallic pipe):LGWKDFURVVIODWV:LGWKDFURVVIODWVîĳ KROH
RUî0WDSîGLYLVLRQîĳ KROH

WO71

φ6±0.1（30）15&RPSDWLEOH
SLSHGLDPHWHU

FR51A

79

φ114±0.3

MS99

3DQHOFXWWLQJ$GDSWHUIRUUHDUIDFHSLSLQJMS99S

VR base (rotary type for vinyl pipe)$GDSWHUIRUUHDUIDFHSLSLQJ

19îĳ KROH
RUî0WDSîGLYLVLRQ

Ｒ9VORWWHG
KROH

MS61A-RA

QDP33
79:LGWKDFURVVIODWVφ114±0.3

EMD8A

3DQHOFXWWLQJ

26

EMD7

Change of base arrangement

Possible base arrangement

Impossible base arrangement

The WO81F type has two base mounting
holes on each of the side face and the rear
face, allowing various base combinations
depending on the piping conditions.

！
CautionEMTGP1

Be sure to use bases in the1．
combination of one high-pressure
side (red) base and one lowpressure side (blue) base.
2. There are impossible basearrangements as shown on theright.
 t two mounting holes on the
3. A
gauge body that are not installedwith bases, be sure to attach thesealing caps.

EMT1H
6HDOLQJFDS%DVH

6HDOLQJ
FDS%DVH

EMT66HDOLQJFDS

6HDOLQJ
FDS

%DVH

%DVH

Mounting orientation and range
Range for mounting orientation arbitrary mounting between horizontal and upright0 to 50Pa，0 to 100Pa，-50 to +50Pa

Whole range other than on the left

It is necessary to specify the mounting orientation (horizontal, upright, and others) at the timeof order placement.
*It is not possible to manufacture such a gauge whose mounting orientation exceeds 135°
for the range of 0 to 50 Pa.

The gauge can be mounted at an arbitrary angle between horizontal and upright.
For other mounting orientations, it is necessary to specify the orientation at the timeof order placement.

8SULJKW

0RXQWHGDWD
UELWUDU\DQJOHE90°HW

8SULJKWSODQH
10° 10°2WK
HUV45°

HWS15A

AccessoriesApplication

GXSULJKW
WDODQ
L]RQ
KRU
HQ
ZH

180°

5°+RUL]RQWDOSODQH

13+RUL]RQWDO

0°20°

2WK
HU
V

8SULJKWSODQH
10°

2W
KH
UV

5°

13180°EMP5A

EMRT1Range for the specification of horizontal and upright mounting

90°

EMT10°

Precautions
Maintenance+RUL]RQWDO
SODQH
20°

20°

18WO81

Manostar gauge
List ofproducts

WO81

Model WO81PC
External dimension drawing

Example of base arrangement
MT base (for metallic pipe)

VT base (for vinyl pipe)

（74）

WO71
φ1001772:LGWKDFURVVIODWV:LGWKDFURVVIODWV

FR51A

φ6±0.1&RPSDWLEOH
SLSHGLDPHWHU

VR base (rotary type for vinyl pipe)

φ7MS99S

77φ95

MS99

MS61A-RA

7063

QDP33:LGWKDFURVVIODWV
7ZRVHWVRIPRXQWLQJILWWLQJVEMD8A:LGWKDFURVVIODWVĳ KROH

EMD7EMT1

φ7

EMTGP13DQHOFXWWLQJ

EMT1H

EMT6

EMP5A

Mounting method

EMRT1'ULYHUHWS15A

Accessories

6FUHZ$6FUHZ$0RXQWLQJVFUHZ%Application

Precautions
Maintenance

0RXQWLQJILWWLQJV

1. Loosen screw A, and remove bothmounting fittings from the gaugebody.

3DQHO

0RXQWLQJILWWLQJV

2. Fit the gauge to the front of the panel
first, put two mounting fittings back,and tighten screw A to secure thegauge.

！
Caution

19

3DQHO

3. Alternately tighten little by little
mounting screws B in two places tosecure the gauge to the panel.

Mounting screw B tightening torque: 0.5 to 0.6 N·m
Do not tighten to a torque that exceeds the specified value because
doing so breaks the gauge body.

WO81Manostar gauge
Model WO81PR

List ofproducts

External dimension drawing

WO81

MT base (for metallic pipe)

VT base (for vinyl pipe)

（70）

21100

WO71

68:LGWKDFURVVIODWV

FR51A

φ7î0PRXQWLQJ
VFUHZ

φ6±0.1&RPSDWLEOH
SLSHGLDPHWHU

77

φ95

100

:LGWKDFURVVIODWVVR base (rotary type for vinyl pipe)
66
59

MS99S

MS61A-RA

QDP33:LGWKDFURVVIODWV

80±0.3MS99:LGWKDFURVVIODWVîĳ KROH

EMD8A

8080±0.3

EMD7φ7

EMT1ĳ KROHEMTGP1

3DQHOFXWWLQJ
80

EMT1H

EMT6

Mounting method

EMP5A
1. From four corners of the squaregauge mounting frame, remove
the M4 nuts, spring washers, andflat washers.
(Be sure to install the gauge without removing the spacer nuts asshown in the figure.)0QXW

6SDFHUQXW

6SULQJZDVKHU)ODWZDVKHU

2.	After installing the gauge in thepanel, tighten the flat washers,
spring washers, and M4 nuts inthat order from the rear side.

！
Caution！
Caution

EMRT1HWS15A

0D[LPXPWKLFNQHVVRIPRXQWLQJSDQHOPP• If you install the gauge to the panel after removing the spacer nut, the gauge frame
may break.
• M4 nut tightening torque: 1 N·m
Do not tighten to a torque that exceeds the specified value because doing so breaks
the gauge body.

Accessories
Application

Precautions
MaintenanceBase tightening torque: 1 N·m
Do not tighten to a torque that exceeds the specified value because doing sobreaks the gauge body. (Refer to page 120)

20

WO81

Manostar gauge
List ofproducts

WO81

WO81
Overview of structure
98WO71

61075

Number

13FR51A
14MS9932MS99S

MS61A-RA

11QDP33
4Diaphragm2

Low-pressure side base (blue)

3High-pressure side base (red)4Sealing cap

5Scale plate

6

Zero point setting device

7

Memory pointer setting device

8Pointer

9

Memory pointer10

Transparent cover

11Housing

12Base13

Cover packing

14

Cover retention ring

12

4

1Name

1

EMD8A

EMD7

Accessories dedicated to WO81

RoHS

Sealing cap
EMT1

EMTGP1

Dedicated
to F typeThis is already installed when the gauge is purchased.
Item number

EMT1H

Portable box(Auxiliaryitem)

Dedicated toF type

KGA81PLG

Material

Polypropylene

Mounting fitting set
EMT6(Auxiliaryitem)

Dedicated to PC
type

EMP5A

EMRT1

HWS15A

Accessories
Application

The combination of parts in the photograph constitutes one set.
On the gauge, two sets (for one gauge) are already installed as astandard accessory.

Item number

Material

Item number

Material

TKA81PC

Aluminum die casting/steel

PB-01

Steel

Accessories for WO81

RoHS

VT baseHigh-pressureside(Auxiliaryitem)*Gauge body is not included.

VR baseLow-pressure side(Auxiliaryitem)Low-pressure side

High-pressure side

Precautions
MaintenanceItem 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 be connected.
This is already installed when the gauge is purchased.

21

Item number

KGA81VR-H

Material

Brass

Item number

KGA81VR-L

Material

Brass

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

WO81

Manostar gauge
WO81

List ofproducts

Accessories for WO81RoHS

PT baseLow-pressure side

High-pressure side

WO81

PR baseLow-pressure side

High-pressure side

WO71

FR51A

Item number

Material

MS99

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)

MS99S

MT baseMR baseKGA81PT-H

Material

PBT/brass

Item number

KGA81PT-L

MaterialPBT/brass

Low-pressure side

High-pressure side

Item number

Material

KGA81PR-H

PBT/brass

Item number

KGA81PR-L

PBT/brass

MS61A-RA

Low-pressure side

High-pressure side

QDP33

EMD8A
Item number

Material

KGA81MT-H

Brass

Item number

Material

KGA81MT-L

Brass

Item number

Material

KGA81MR-H

Brass

Item number

Material

KGA81MR-L

Brass

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 (outerdiameter 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).

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

MTW base

Adapter for rear face piping

Low-pressure side

High-pressure side

Highpressureside(Dedicated to F typerear face piping)

Lowpressureside(Dedicated to F typerear face piping)

EMD7

EMT1

EMTGP1

EMT1H

EMT6

EMP5A
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

Brass

Item number

Material

KGA81FBA-L

BrassWhen arranging an MT base on the rear face of the WO81F type, thisadapter is required as a spacer for hooking a stabilizing wrench to thebase at the time of pipe connection. This adapter is also required whenarranging the VR base or MR base (excluding MTW base) on the rearface in order to avoid interference between the base and panel. Whenconnecting an R1/8 joint, use an R1/8 base adapter.

R1/8 base adapter

Low-pressure side

High-pressure side

EMRT1

HWS15A

Accessories

R1/8 base adapter (SUS)

Low-pressure side

High-pressure side

Material

Application

Precautions
MaintenanceItem number

KGA81R1/8AD-H

Material

Brass

Item number

KGA81R1/8AD-L

Material

Brass

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

Item number

KGA81R1/8AD-H-S

Material

Stainless steel

Item number

KGA81R1/8AD-L-S

Material

Stainless steel

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

22

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, 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