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MODEL PG-2
PRESSURE GAUGE
Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use of the
product, please read this manual before use. This manual shall be kept with care for future references.
The symbols used in this manual have the following meanings.
Warning
Caution
1. Specification ····························································· 1
1.1 Specification ······················································· 1
1.2 Accuracy of pressure gauge (allowable tolerance) ······ 1
2. Structure, Dimensions and Weights ······························· 2
3. Delivery, Storage and Installation ·································· 2
PRODUCT MANUAL
This symbol indicates a potentially hazardous situation that, if not avoided,
could result in death or serious injury.
This symbol indicates a hazardous situation that, if not avoided, may result in
minor or moderate injury or may result in only property damage.
Table of Contents
.
3.1 Caution for delivery and storage ······························ 2
3.2 Warning and caution for installation ······················· 2-3
4. Operation ································································· 4
4.1 Warning and caution for use ··································· 4
5. Maintenance and Inspection ········································ 4
5.1 Troubleshooting ··················································· 4
5.2 Warning and caution for maintenance and inspection · 5
Warranty information
■EPDT-299c■
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1.1 Specification
Model PG-2
Application Steam, gas, liquid *1
1. Specification
Maximum temperature
Largeness
60℃ *2
φ100
Case shape Type A
0 to 0.25 / 0.4 / 0.6 / 1.0 / 1.6 / 2.5 / 4.0 MPa
Pressure range
0 to 2.5 / 4.0 / 6.0 / 10 / 16 / 25 / 40 bar (Dual scale dial indicates pressure in bar
and psi.)
Case SUS
Material
Bourdon tube
Spanner
flats
SUS
SUS
Connection G3/8, BSPT1/2, NPT1/2
*1 If using oxygen, degrease treatment is needed. If using oxygen, please contact us.
*2 If application exceeds maximum temperature, use the product with siphon pipe.
*3 The product cannot be adjusted or disassembled.
*4 Please keep the product from water and use it in a dry place
1.2 Accuracy of pressure gauge (acceptable tolerance)
Scale range is according to Fig. 1.
(%)
50%
Scale range A
Scale range A Scale range B
±1.6 ±2.4
*Value of acceptable tolerance is
expressed in percentage of
pressure span (all scale range).
Please confirm that the indications on the product correspond with the specifications
Caution
of the ordered product model before use.
* If they are different, do not use the product and contact us.
Scale range B
Side 25%
Side 25%
Scale range B
Fig. 1
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Width across flats 17
2. Structure, Dimensions and Weights
Glass
Pointer
Case
Flats
Width across flats 22
Glass
Pointer
Case
Flats
Fig.2：Dimensions of the product with screw
connection G3/8
*Weights are 0.31kg
Fig.3 ： Dimensions of the product with screw
connection BSPT1/2・NPT1/2
*Weights are 0.38kg
3. Delivery, Storage and Installation
3.1 Caution for delivery and storage
Caution
1. During delivery, avoid addition of vibration to the product as possible. Be sure to avoid hitting the
product on the wall and dropping the product.
*Failure to follow this notice may make the product unusable.
2. Store the product on the place where there are few dust, vibration, humidity. Also, select a place with
less temperature change as possible because the product can form dew in a place with large
temperature change.
3.2 Warning and caution for installation
Warning
1. If the product is used on a line with high frequency of pressure fluctuation, it will cause the product
malfunction. Please take measures before applying pressure fluctuation directly to the pressure
gauge.
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■EPDT-299a■
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Head difference
Caution
1. Install the product so that scale plate is vertical.
* If not vertical, accidental error can be made.
2. In case of liquid measurement, if there is head difference between pressure pick-up port and
pressure gauge, accuracy is influenced. For example, to measure water pressure, if installing
pressure gauge of pressure range 0 to 0.1 MPa on the place of 1 m higher than pressure pick-up
port, reading is the value of actual pressure minus 0.01 MPa. This difference is equivalent to 10% of
all scale range (Fig. 4). Conversely, if installing pressure gauge of pressure range 0 to 0.1 MPa on
the place of 1 m lower than pressure pick-up port, reading is the value of actual pressure plus 10%
(Fig. 5).
Main pipe
Head
difference
Pock-up port
Pick-up port
Main pipe
Fig. 4
Fig. 5
3. Avoid using the product at place where it is exposed to high temperature. If necessary, prevent the
product from being exposed to heat directly by using closure plate, etc.
4. If the fluid temperature to measure exceeds the max. temperature, mount a siphon tube to the product
to reduce the fluid temperature. Be sure to inject water to the siphon tube to protect the product.
5. Avoid using the product at place where much vibration occurs.
6. If fluid has pulsation, use dampener to install the product. To adjust dampener, close it fully at once,
then adjust it by opening little by little. In this case, do not tighten the product enough to stop pointer
swinging completely. Adjust to the extent that pointer swing remains slightly.
7. To install the product, be sure to apply appropriate tool such as spanner to hexagonal part and
tighten it. Be sure to avoid screwing the product with holding the product case.
8. Before installing the product, be sure to remove foreign substances and scale from the piping.
During installation, prevent foreign substances flowing into the piping, such as packing, seal tape,
liquid seal agent, etc.
* Commingling of foreign substance or scale into the product prevents the product from functioning
properly.
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■EPDT-299a■
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Pointe
r does not
1. Apply pressure.
2. R
emove
foreign substance.
1. Lower temperature.
2. Correct the head.
3. R
eplace
with new one.
Response is slow.
1.
Make appropriate tightening.
2.
Make the piping thick.
1.
Replace with new one.
2. Remove
foreign substance.
3. Replace
with new one.
Off the scale
1.
Replace with new one
.
2.
Replace with new one
.
4. Operation
4.1 Warning and caution for use
Warning
1. Do not apply pressure more than maximum pressure to the product.
* If bourdon tube is broken, it may lead to injury or damage to the surroundings.
2. Use the product within usable temperature range.
* If using the product out of usable temperature range, the product may be broken and lead to injury
of damage to the surroundings
3. Do not use the product for the fluid with corrosive property for the wetted part material of the product.
* If bourdon tube is broken due to corrosion, it may lead to human injury or damages to the
surroundings.
Caution
1. Make using pressure be in the range of 25 – 75 % of maximum scale.
2. Do not disassemble the product.
* It will cause product malfunction.
5.1 Troubleshooting
Trouble Cause Remedy
work.
Accidental error is
large.
Pointer does not point
zero when the
product is removed
from piping.
5. Maintenance and inspection
1. Pressure is not applied
2. Piping is clogged by foreign
substance.
1. Fluid exceeds usable temperature
range.
2. Head difference due to difference
of height.
3. Abrasion of internal structure due
to heavy vibration or pressure
fluctuation.
1. Too much tightening of dampener.
2. Piping is too thin for viscosity of
fluid.
1. Deformation of bourdon tube due to
over pressure.
2. Clogging of foreign substance in
fluid.
3. Abrasion of internal structure due to
heavy vibration or pressure
fluctuation.
1. Deformation of bourdon tube due to
over pressure.
2. Gap of pointer and deformation of
bourdon tube due to impact.
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■EPDT-299a■
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5.2
Warning and caution for maintenance and inspection
Warning
1. To remove the product, be sure to make pressure zero (atmospheric pressure) and then remove
the product carefully.
* Failure to follow this notice may make blowout of internal fluid and lead to scalds or injury.
2. If fluid is in high temperature, do not touch the product directly with bare hands.
* Failure to follow this notice may lead to scalds or injury.
3. If glass crack or deterioration is found, be sure to replace the product with new one.
Caution
1. Regardless of regulation by law, conduct maintenance and inspection once or more per year
periodically.
* Remove the product from the site and check it with pressure standards.
2. The product cannot be repaired or calibrated. If abnormality is found, replace the product with new
one.
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■EPDT-299a■
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