Precautions on use！

Precautions common to instruments

Precautions on handling○ When pressure that exceeds the withstand pressure of a pressure-receiving element is applied to an instrument, the diaphragm and thesurrounding portion will break.
○ When pressure that exceeds the instrument body withstand pressure is applied to an instrument, the instrument case, transparent
cover, and other parts will explode or break.
○ When pressure that exceeds the withstand pressure of a pressure-receiving element is simultaneously applied to each of the highpressure (H) side and low-pressure (L) side of an instrument, the arriving pressures may differ from each other depending on thedifference in chamber capacity or piping capacity between the high-pressure (H) side and low-pressure (L) side of the instrument tocause a force that exceeds the withstand pressure of the pressure-receiving element, possibly leading to breakage or deformation of
the diaphragm and its surrounding portion. When simultaneously applying pressure that exceeds the withstand pressure of a pressurereceiving element from the high-pressure (H) side and low-pressure (L) side, gradually increase the pressure by taking time. Also, whenreleasing the pressure, gradually decrease the pressure.

What is the withstand pressure of a pressure-receiving element?
This term refers to the maximum pressure (withstand pressure on one side) that a diaphragm can withstandso as not to break and deform, and it is the pressure to be applied to either one of the high-pressure (H) sideor the low-pressure (L) side.
What is instrument body withstand pressure?
This term refers to the maximum pressure (withstand pressure on both sides) that an instrument body cansafely withstand without breaking, and it is the pressure to be applied to both the high-pressure (H) sideand the low-pressure (L) side. The term does not mean the pressure that guarantees the airtightness of an
instrument.
○ Manostar products are precision devices. If you drop a Manostar product, its exterior and the internal mechanism may break.
○ Do not disassemble Manostar products.
○ When removing dirt from a product surface, wipe the dirt off with a cloth moistened with mild neutral detergent. When an organic
solvent is used on a Manostar product, its surface may corrode from the solvent, and the resin may crack.
○ In the event of an overcurrent that exceeds the contact specification, the contact of a switch will be welded.
○ Install such an instrument that requires a power source away from machines that generate strong high frequencies (high-frequencywelder, high-frequency sealer, etc.) and strong drive power sources as much as possible.
○ When a power supply is connected to a signal input and output terminal by mistake, the device interior will be burned.
○ For current/voltage input and output signal lines, use wires with shielding in order to prevent induction problems. Do not put input andoutput signal lines close to a power line or pass them through the same conduit as that for a power line.

Use environment○ Avoid using a product in a location exposed to direct sunlight, strong vibrations or impacts, or with high humidity for many hours. Inparticular, vibrations and impacts shorten the service life of the instrument.
○ Because our instruments are not waterproof, do not use them in locations directly exposed to rainwater and other liquids. Our
instruments cannot be directly installed outdoors. When it is necessary to install an instrument at an outdoor location, house theinstrument in a drip-proof housing for outdoor use.

Zero point setting○ After installing an instrument, adjust the zero point in the orientation in which the instrument is used.
○ Be sure to conduct the zero-point setting after opening the high-pressure side and low-pressure side bases to the atmosphere orstopping the machine and then completely eliminating the residual pressure.

List ofproducts

WO81

WO71

FR51A

MS99

MS99S

MS61A-RA

QDP33EMD8A

EMD7

EMT1

EMTGP1

EMT1H

EMT6

EMP5A

EMRT1

HWS15A

High-pressure side and low-pressure side polarities○ High-pressure side and low-pressure side polarities depend on the bases.
○ On models WO81 and WO71 FS type/PS type (side face piping), it is possible to convert the polarity by exchanging the bases. Thehigh-pressure and low-pressure sides are identified with the colors of red and blue, respectively.
○ In a single pressure measurement, if a measurement is conducted by removing a base for which piping is not necessary, the gauge willnot operate normally.

Accessories
Application

Precautions
Maintenance118

Precautions on use！
List ofproducts

WO81

WO71

FR51A

MS99

MS99S

MS61A-RA

QDP33

EMD8A

Precautions common to instruments

Measurement of single pressure (biased pressure)○For Manostar products, “differential pressure” is indicated. “Absolute pressure” and “gauge pressure” are not indicated. Once either one of
the bases on the high-pressure and low-pressure sides is opened to the atmosphere, the indication will be “gauge pressure.” This is called“single pressure (biased pressure)” in contrast to differential pressure.
○When conducting a single pressure measurement by opening one of bases, carefully check the duct internal pressure (line pressure) anduse the gauge in a range suitable for the pressure.
○To measure positive pressure, connect a pipe to the high-pressure side base (red, or H). Although the low-pressure side is open to theatmosphere, do not remove the low-pressure side base (blue, or L).
○To measure negative pressure, connect a pipe to the low-pressure side base (blue, or L). Although the high-pressure side is open to theatmosphere, do not remove the high-pressure side base (red, or H).
○To measure a single pressure (biased pressure) with a zero center range instrument, connect a pipe to the high-pressure side base (red, orH). Do not remove the low-pressure side base, which will be open to the atmosphere. The significant value on the scale plate indicates thesingle pressure.

Prevention of clogging of pipe by drainage

Drain tank installation diagram *DXJH
VZLWFK○When drainage accumulates in the middle of a pipe, pressure
measurements are subject to errors. Therefore, be sure to install aninstrument at a location higher than the pressure extraction port of apressure detector to prevent drainage from accumulating in part ofthe pipe.
○If this precaution cannot be observed out of necessity, install a draintank in the middle of the pipe as shown on the right and periodicallyclean the tank.
○After cleaning, confirm that airtightness is positively maintained.

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EMTGP1○In piping with a pressure detector and an instrument, provide a single
pipe for each system as shown on the right, and do not share the pipewith the neighboring system.
○When shared piping is made, the pressures of the respective systems
interfere with each other, leading to errors.

3DWK

Prohibition of shared piping
EMT1&KDPEHU$ &KDPEHU%6ZLWFK*DXJH

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EMT1H

EMT6

EMP5A

Measurement of pressure of high-temperaturegas○To measure the pressure of a high-temperature gas, use temperatureresistant metal (stainless steel, for example) in the pressure detector(Pitot tube), and connect to an instrument body with a metal pipe
having a length necessary for cooling the high-temperature gas.

EMRT1

HWS15A

Accessories
Application

Precautions
Maintenance

119

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GHJUHHV&HOVLXVFKLPQH\Error due to long-distance piping○When the pipe of an instrument is long, the instrument’s response
speed will be slower.
Make the size of the pipe in the middle as large as possible.
If the piping condition significantly differs between the high-pressure
side and low-pressure side, the piping resistance also differs
between the high-pressure side and low-pressure side, and there will
be a difference in the pressure arrival time, making it impossible toaccurately measure the differential pressure.

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Precautions on use！

Precautions common to instruments

List ofproducts

Installation of base●Common• Tightening torque
The airtightness between the base connection part of an instrument and the base and sealing cap is maintained by anO-ring. Install the bases and sealing caps to the following tightening torques. Do not tighten to a torque that exceeds thespecified value because doing so breaks the instrument body.
• Base for metallic/vinyl pipe……………………1N·m:UHQFKIRUWLJKWHQLQJXVH• Sealing cap………………………………………0.5N·m• Combined use of a stabilizing wrench
When tightening a cap nut on a base for metallic pipe, a joint tobe connected to an adapter, or other part, positively secure thebase or adapter body with a stabilizing wrench. If a cap nut or joint
is tightened without securing the base or adapter, the instrument
body or the base body will break.
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Also, when loosening the cap nut or joint, a stabilizing wrench is
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necessary.
%DVHERG\6WDLQOHVV7DSHUHGVHFWLRQRIERG\&DSQXW VWHHOSLSH●PT base, PR base
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7XEH• Connection of tube
Insert a tube whose end is cut at a right angle to the base all theway to the end.
)URQWIHUUXOH%DVHERG\ %DFNIHUUXOH• Disconnection of tube
Push the tube once, and then pull out the tube while pushing therelease ring along the tube.
Although the operating ambient temperature of the PT baseand PR base6WDLQOHVV
is 0°C to 60°C
(no freezing allowed), do not use
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them in an environment where the ambient temperature
exceeds theoperating
ambient temperature of the instrument.
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Failure to follow this instruction may lead to a failure or breakage of the instrument. Use a tube with a difference
betweenVWHHOSLSH
its maximum outer diameter and minimum outer diameter of 0.2 mm or less and an exterior free of scratches.
When a tube is going to be subject to repetitive connection and disconnection, cut off the0DWLQJ
tip of the tube by 3 mm or longer.
PDUN●MTW base• Method to tighten pipe and base%DVHERG\6WDLQOHVV7DSHUHGVHFWLRQRIERG\&DSQXW VWHHOSLSH)URQWIHUUXOH)URQWIHUUXOH

6WDLQOHVVVWHHOSLSH1. Confirm whether the parts of a base fit asshown %DVHERG\in the figure above, and then insert
a stainless steel tube until its end makes
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contact with the back of the body.
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MS99

MS99S

MS61A-RA

QDP33

EMD8A

EMD7

EMT1

EMT1H

EMT6&DSQXW

EMP5A
2. After tightening the cap nut with%DVHERG\0DWLQJthe fingers up to the point
whereWXUQV PDUN
it does not turn any further, put amating mark on each of the base
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bodyand the cap nut.

3. From this position, tighten
the cap nut by turning it oneand one-quarter turns with awrench.

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FR51A

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PDUN

WO71

&DSQXW%DFNIHUUXOH%DVHERG\WO81

EMRT1

HWS15A&DSQXW&DSQXW
after a disconnection• Method to retighten pipe
1.	Before connecting the pipe, confirm that no foreign substances, such as dirt, are attached to the tapered section of thebody and the front ferrule.
2.	Insert thepipe until the front ferrule makes contact with the tapered section of the body, and then tighten the cap nut with%DVHERG\0DWLQJthe fingers to the point where
it does not turn any further.
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3. Hook a stabilizing wrench to the base body, and tighten the cap nut by turning it one and one-quarter turns.

Accessories
Application

Precautions
Maintenance

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120

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, 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