RoHS

READ THE INSTRUCTION MANUAL BEFORE USINGINSTRUCTION MANUAL

M A N O S T A R

G A G E

WO81

No. TR-WO81-E15

1-2-3,Nishi-shiriike-cho,Nagata-ku,Kobe,Hyogo 653-0031 JAPANTEL. +81（78）-631-6000 FAX. +81（78）-631-6020

TABLE OF CONTENTS
PAGE

INTRODUCTION .................................................................................................................................................... 1
Ⅰ．PRECAUTIONS .............................................................................................................................................. 1
Ⅱ．INSTALLATION
1．Caution of service condition .......................................................................................................... 2
2．Installation of WO81F........................................................................................................................ 2
3．Installation of WO81PC .................................................................................................................... 3
4．Installation of WO81PR .................................................................................................................... 3
5．Installation position ............................................................................................................................ 4
6．To change arrangement of piping connectors of WO81F .................................................. 47．Accessory for WO81 ......................................................................................................................... 4
8．About tightening piping connector .............................................................................................. 69．Zero point setting ............................................................................................................................... 6
10．Setting of flag pointer....................................................................................................................... 6
11．Polarity of high and low pressure side ...................................................................................... 6
12．Pressure of measurement and connection of piping ........................................................... 7

Ⅲ．GENERAL PRECAUTIONS
1．Prohibition of common piping ........................................................................................................ 7
2．Prevention of clogged piping due to drain................................................................................ 7
3．Measurement of high temperature gases ................................................................................. 7
4．Errors caused by long distance piping ....................................................................................... 7

Ⅳ．PERIODIC INSPECTION .......................................................................................................................... 8
Ⅴ．PRODUCT WARRANTY ............................................................................................................................ 8

INTRODUCTION
Thank you very much for purchasing of "MANOSTAR GAGE WO81".
To ensure your safety in using this instrument :△！

Caution・Be sure to read the instruction manual carefully before using the instrument so that you
can use it properly.
Wrong use may result in failure of the instrument and lead to its damage and accident. Thismanual should be kept in a proper place so that you can refer to it any time you need.

Ⅰ．PRECAUTIONS△Warning！

・Do not use the instrument where flammable gas is present.
The instrument is not explosion-proof. Do not use instruments in the circumstance where flammable gas ispresent. It may cause explosion.
・Do not use the instrument at the place where corrosive gas is present.
The instrument is not corrosion resistance construction. Measuring corrosive gas may corrode thereceiving element and housing material of the instrument. It is expected that corrosive gas leaked out of theinstrument will harm a person.
・Do not apply the pressure to the instrument more than it can withstand.
The diaphragm and the retainer are broken and cause of injury or accident, etc. disaster if the pressure
exceeding withstanding pressure of the pressure receiving element is applied to the instrument. The casebody and the transparent cover of the instrument are broken and cause of injury or accident, etc. disaster if
the pressure exceeding withstanding pressure of the instrument body is applied to the instrument.
・The instrument is measurable for air and non-corrosive gas only.
The machine is exclusive use of dry air (90％RH or less). Using measuring the water or oil it may bedamaged and causes the accident.
・Avoid using where the instrument is subject to many vibration and impact.
Using the instrument where intensified vibration and impact may be damaged the instrument. It is expectedthat gas leaks of the instrument which harms a parson.
・Do not exceed rated surrounding temperature, humidity and altitude in use.
Using the instrument by exceeding rated surrounding temperature and humidity and altitude it may bedamaged and cause the accident.
・Do not disassemble or reconstruct the instrument.
It may void the warranty.

△Caution！

・As to where to install and how to install this instrument, be sure to follow the instruction manual provided
so as to ensure a proper method.
・Use the instrument indoors.
・In case of not being installed in dry and well-kept clean locations, the instrument must be enclosed in box.
・Do not use organic solvent for cleaning.
Use a cloth soaked with water-diluted neutral detergent to wipe the surface of a product. Using of organic
solvent causes damage on the surface.
・Dropping the product.
Product is a precision instrument. If you drop the product, there is a possibility that the exterior, also theinterior mechanism damage.
・Removal of the piping
If you replace the old pipes, please do not pull the pipe with a strong force. There is a possibility that thepipe cap is broken.
1Ⅱ．INSTALLATION
Before using this instrument, make sure if it is the type that you requested and meets the demand of theenvironment, pressure and piping conditions where it is used, by specification.

1. Caution of service conditiona) Do not use the instrument in a place subjected to direct sunlight, vibration or shock, or excessive
moisture. In particular, vibration and shock to the instrument should shorten its life.
b) Use under the medium and ambient temperature from - 10 to + 50 ℃.
c) The instrument is not waterproof. Do not use it in a place subjected to rain, or other splashing water.
d) The instrument cannot be installed outdoors without an appropriate protection. If outdoor installing isrequired, the instrument should be housed in a box of drip-proof type for outdoor use.
e) In installing the instrument, select the place where the ground is smooth and flat.

2. Installation of WO81Fa) Panel cut size
Installed the piping connector on the side.
3×φ5 holes
or 3×Ｍ4 holes tapped
3×120ﾟ segmentation

φ114±0.3

With ＶＴWith ＭＴ

With ＶＲ

With ＭＲ

Panel cut size

Installed the piping connector on the rear.
3×φ5 holes
or 3×Ｍ4 holes tapped
3×120ﾟ segmentation

Adaptor forrear piping

2×φ18 holes
79With ＶＴWith ＭＴ
Adaptor forrear piping

Adaptor forrear pipingφ114±0.3

Panel cut size
3×φ5 holes
Ｒ979

With ＶＲWith ＭＲ

φ114±0.3

Panel cut size

△Caution！

・When you install MT, VR andMR connector to the back piping
connector port, use the piping
adaptor for rear piping.
(KGA81FBA-L, KGA81FBA-H).
It is necessary to avoid
interference with piping
connectors and panel and to help
put a locking spanner at thisadaptor as a spacer.
・MT, VR and MR connectors are
sold separately as “connectorfor replacement” (refer to p. 5)b) How to install
Mount installation feet for the instrument by attached screws.
M4 screw
Spring washer
Plain washer

Panel
φ5 holesPlain washer
M4 nutFor nut tightening△！

CautionM4 screw
Spring washer
Plain washer

Panel
M4 tapFor machine screw tightening

Tighten the piping connectors with the torque of 1 N･m.
Do not apply excessive torque more than necessary, otherwise it will damage the instrument body.

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3. Installation of WO81PCa) Panel cut size

Screw Ａ
φ96±0.3 hole

Panel cut size
The same panel cut size canbe used for gages with MT,
VR and MR connectors
available separately.

b) How to install

Installation adaptor（Fig.Ⅱ-1）

DriverScrewＡ

Screw Ａ

Installation screw B
Installation adaptor

1. Loosen screw A and remove
two installation adaptors.

△！

CautionPanel

Installation adaptor

2. Install the instrument bodyfrom the front side of the panel.
Set two installation adaptors
and tighten the screws A sothat they were put into theoriginal position.（Fig.Ⅱ -1）

Panel

3. Tighten two installation screw
B alternately and fasten theinstrument body to the panel.

Tighten the installation screws B with the torque from 0.5 to 0.6 N・m.
Do not apply excessive torque more than necessary, otherwise it will damage the instrument body.

4. Installation of WO81PRa) Panel cut size
4×φ5 holes
80±0.380±0.3The same panel cut size can be used
for gages with MT, VR and MR
connectors available separately.

φ96±0.3 hole

Panel cut sizeb) How to install△Caution！

Specer nut

M4 nutSpring washer

Max. thickness
installed panel 6mm

Plain washer

1. Remove M4 nuts, spring
washers and plain washers onfour corners, but don’t
remove spacer nuts. (When youinstall the instrument body on thepanel, keep on attaching spacer
nuts to the instrument body.)

2. After installing the instrument
body on the panel, set plain
washers and spring washers.
Then tighten four sets of M4
nuts from the back of the panel.

3･If you install the instrumenton the panel without spacernuts, the instrument bodywill be broken.
･Tighten the installation M4
nut with the torque from 1N・
m. Do not apply excessive
torque more than necessary,otherwise it will damage theinstrument body.

5. Installation position
0～50 Pa, 0～100 Pa, -50～+50 Pa

All other ranges except for the following

Specification of the installation position(horizontal, vertical, other) is necessary at thetime of an order.

Installation position from upward horizontal tovertical is available.

※135°or more with the range 0～50 Pa is not available.

Vertical plane

10°

Vertical plane

10° Vertical

10°

90°

20°

180°

5°
135°
1345°

90°

Horizontal

180°

Horizontal plane

0°

20°

20°

aHorizontal plane

0°Specified installation positionb

Following installation position is available

In ordering out of above mentioned installation position, please order us or our agency beforehand. It must
be adjusted before the factory shipment.

△！

CautionUse of in a position other than the specified is out of accuracy warranty.

6. To change arrangement of piping connectors of WO81F
WO81F have two piping connector ports on the sides and back.
It is possible to four kinds of arrangement by combination of piping.
Possible arrangement of piping connectors

Pipingconnector

Seal plug△！

Caution

Impossible arrangement of piping

Pipingconnector

Seal plug

Seal plug

Pipingconnector

Pipingconnector

Seal plugWith seal plugs, be sure to close the two piping connector ports where connectors are notattached.

7. Accessory for WO81
Installation bracket to set for WO81 PC type
Aluminum die cast, steel-made [ installed (PC type) ]Portable box for WO81 model
Steel-made [ option ]Product code

Product code

TKA81PC

PB-01

The combination shown in the above photo is a set of theinstallation adaptor.
This set is intended for reserve. These two sets areattached to the body as standard accessory.

※The gage is not included.

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VT connector for vinyl or rubber tube
resin-made [ installed ]MT connector for metal tube
brass-made [ option ]Product code

Product code

High pressure

Low pressure

High pressure

Low pressure

KGA81VT-H-P

KGA81VT-L-P

KGA81MT-H

KGA81MT-L

Be sure to use I.D.6 and thickness of 1mm or more.
However, the vinyl or rubber tube with enough withstandingpressure (including vacuum pressure) is required when theinstrument range or the line pressure is higher than 50 kPa.
VR connector for vinyl or rubber tube
brass-made [ option ]Product code
High pressure

Low pressure

KGA81VR-H

KGA81VR-L

This connector can be connected to the metal tube (O.D.6±0.1) made from copper, aluminum and so on.
When this connector is connected to plastic tube (O.D.6,I.D.4), remove the brass-made sleeve and use the resinous
inner sleeve set (XIN6×4) that is sold separately. (pleaseuse the type MTW connector for the stainless steel pipe)
MR connector for metal tube
brass-made [ option ]Product code

These connectors are rotary elbow type and can beconnected to vinyl or rubber tube of I.D.6.

Product code
High pressure

Low pressure

KGA81PT-H

KGA81PT-L

KGA81MR-H

KGA81MR-L

PR connector for plastic tube
PBT, brass-made [ option ]Product code

The joint installed tube is push-in type. Use the optional
tube or the applicable tube (JIS B8381-1).
MTW connector
stainless steel-made [ option ]High pressure

Low pressure

KGA81PR-H

KGA81PR-L

The joint installed tube is push-in and rotary elbow type.
Applicable piping material is the same as PT connector.

Product code
High pressure

Low pressure

KGA81MTW-H-S

KGA81MTW-L-S

Adaptor for rear piping
brass-made [ option ]This is connector can be connected to stainless tube (O.D.
6±0.1).
（Fig.Ⅱ-2）

Low pressureThis connector is rotary elbow type and can be connectedto the metal tube (made from copper and aluminum and soon). Applicable piping material is the same as MTconnector.

PT connector for plastic tube
PBT, brass-made [ option ]Inner sleeve set for plastic tube
polypropylene-made [ option ]High pressure

Inner（resin)
Sleeve（resin)
Plastic tube

Product code
XIN6X4
You need this to connect plastic tube (O.D.6, I.D.4) to theconnectors for metal tube. (Fig.Ⅱ-2）(for F type)

Product code
High pressure

Low pressure

KGA81FBA-H

KGA81FBA-LIt’s used when attaching MT, VR and MR connector(Except MTW) to the back with type FV and type FS.
R1/8 Connector adapter
brass-made [ option ]Product code
High pressure

KGA81R1/8AD-H KGA81R1/8AD-L

Seal plug polypropylene-made[installed]

Joint of R1/8 can be connected.
※Specifications are different from the adaptor for rearpiping. (KGA81FBA)

Product code
KGA81PLG△！

CautionHigh pressure

Commercial products (connectors etc) can’t be used, because the structure is different.
Be sure to use exclusive connectors.

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8. About tightening piping connector

Spanner for tighteninga) Tightening torque
The plug sealing between the piping connector port of the
instrument, the piping connector, and the sealing plug isachieved by O-rings. Apply the tightening torque specified
below when tightening the piping connector and sealing plug.
The instrument body will be broken if excessive torque isapplied.

Locking spanner・Piping connector for
vinyl or rubber tube and metal tube ････ 1 N・m（Fig.Ⅱ-2）

・Seal plugs .......................................... 0.5 N・mb) Tightening with locking spanner
Always use locking spanner to tighten the ring joints for MT
connectors (for metal tube) or MR connectors (rotating typefor metal tube) and be careful not to apply the tightening
torque directly to the instrument body.
The locking spanner is also needed to ease the cap nuts.
（Fig.Ⅱ-2）

Cap nut
for metal tube

△Caution！

Do not directly tightening a cap
nut without a locking spanner, or
it will cause the damage to portsof connectors at the main body ofthe instrument.

9. Zero point setting
Set the zero point of the gage or the pressure transmitter by turning thezero adjuster, after installing them in the position which they are used.
Before setting the zero point, be sure to open the high and low pressure
piping connector to atmosphere, or stop the equipment to run low theresidual pressure to zero.

10. Setting of flag pointerPointer
Setting deviceof zero point

Without flag pointerThe flag pointer is used for indicating a predicted values or a limit values.
Set it at the predicted or limit values.
With one flag pointer :If you turn the setting device of the flag pointer clockwise, the flag
pointer moves counter-clockwise.
With two flag pointers :If you adjust the right setting device of the flag pointer and the redpointer moves, likewise, adjust the left setting device of the flag pointer,
the green pointer moves. Turn the setting device of the flag pointerclockwise, and the flag pointer moves counter- clockwise.

Flag pointer (red)Pointer
Setting deviceof zero point
Setting deviceof the flag pointerWith one flag pointerFlagpointerFlag pointerPointer
Setting deviceof zero point

11. Polarity of high and low pressure side
The polarity of the high and low pressure side is determined by the piping
connector attached. In the model WO81 and WO70, the polarity can beinverted by switching the piping connector each other. The high pressure
side and the low pressure side are identified with red and blue color
respectively.

6With two flag pointers12. Pressure of measurement and connection of pipinga) Measurement of positive pressure
Connect the tube to the high pressure side piping connector (indicated by red color or letter H). The
lower pressure port (blue or L) should opened to atmosphere, but do not remove the piping connector.
b) Measurement of negative pressure
Connect the tube to the low pressure side piping connector (blue or L). The high pressure port (red orH) should be opened to atmosphere, but do not remove the piping connector.
c) Measurement of differential pressure
Connect the tube from the high pressure piping connector to the high pressure port (red or H) and fromthe low pressure piping connector to the low pressure port (blue or L).

△！

CautionMeasurement of single pressure using an instrument with zero point center range.
Connect the tube to the high pressure side piping connector (red or H). In this case again,
leave the piping connector attached to the low pressure side, which is opened toatmosphere. The single pressure is as displayed on a zero point center scale (+-).

Ⅲ．GENERAL PRECAUTIONS
1. Prohibition of common piping
Independent piping○
Room A

Room B

WO81

WO81

2. Prevention of clogged piping due to drain

Common piping×
Passageway

Passageway

Piping each of pressure detectors and pressurereceiving instruments tube exclusively dedicated forit, and do not connect the piping commonly with theadjacent system as shown in the right figure.
Common piping causes measurement error because
the pressure of each system interferes.

Room A

Room B

WO81

WO81

Installation diagram of drain tankIf drain remains within the line, it causes measurement error. Be sure toinstall the pressure receiving instrument above the pressure outlet portof the pressure detector and arrange the line so that the drain water
should not remain in the slack piping.
If the arrangement mentioned above in not possible, install a drain tankwithin the line as shown in the right figure and clean it once in a while.
After the cleaning of the tank, check that the air tightness is fully kept.

3. Measurement of high temperature gases

Gage

Drain tankDrain

In the pressure measurement of high temperature gas, use the pressure
detector (pitot tube) made of the heat-proof metal (such as stainlesssteel), and connect it with the pressure receiving instrument through ametal tube which is long enough to cool down the high temperature gas.

The speed of response is delayed when the product is used for remotemonitoring.
In such application, the I.D. of the connection tube should be as large as
possible.
If the piping conditions of the high and low pressure side are significantly
different, the difference in the piping resistance between high and low
pressure side causes the difference in pressure transmission time, andthe measurement becomes inaccurate.

7

Piping length

4. Errors caused by long distance piping

Ⅳ．PERIODIC INSPECTION
Generally speaking, it is important not to exert external stress to keep life and reliability of the instrument for along time.
Proper use of this instrument will ensure its faultless service over many years without any necessity of periodic
lubrication. However, it is recommended that it is subjected to periodic inspection (calibration) once a year.

Ⅴ．PRODUCT WARRANTY
Warranty Period
The warranty period shall be for one year from the date that the product has been delivered to the location
specified by the purchaser.
Warranty Scope
In the event of any failure or defect in the product or non-conformity of specifications due to the reasons solely
attributable to Yamamoto Electric Works, Yamamoto Electric Works shall remedy such malfunctioning or
defective product at its own cost in one of the following ways to be selected by Yamamoto Electric Works:ⅰ) repair such product, ⅱ) replace such product.
However, this Warranty shall not cover the damages or defects that arise due to any of the following reasons.
(1) Any failure resulting from improper conditions, improper environments, improper handling, or improper
usage other than described in the instruction manual or the specifications arranged between the purchaser
and Yamamoto Electric Works.
(2) Any failure resulting from factors other than a defect of our product, such as the purchaser’s equipment or
the design of the purchaser’s software.
(3) Any failure resulting from modifications or repairs carried out by any person other than Yamamoto ElectricWorks’ staff.
(4) Any failure caused by a factor that cannot be foreseen at a scientific/technical level at the time when theproduct has been shipped from Yamamoto Electric Works.
(5) Any disaster such as fire, earthquake, and flood, or any other external factor, such as abnormal voltage, forwhich we are not liable.
Yamamoto Electric Works specifically disclaims all implied warranties of merchantability and/or fitness for aparticular use or purpose, as well as liability for incidental, special, indirect, consequential or other damages
relating to the product.
*This product warranty is only valid within Japan.
Product Applicability
Our products are designed and manufactured as general-purpose products for general industries. Therefore, ourproducts are not intended for the applications below and are not applicable to them.
(1) Facilities where the product may greatly affect human life or property, such as nuclear power plants,
aviation, railroads, ships, motor vehicles, or medical equipment(2) Public utilities such as electricity, gas, or water services(3) Usage outdoors, under similar conditions or in similar environments
This document has been translated from the original Japanese version, and the original Japanese version takes
first priority.
Be sure to refer to the original Japanese for the details of this warranty.

<Prior notice>

The specifications and description of the product explained in this instruction manual may be subject to change
without prior notice because of modification and the like.

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