Temperature characteristics
●
Small Precision Pressure Gauge
1.
The small precision pressure gauge is a pressure indicator
designed for more sensitive pressure measurements. Avoid use
in locations subject to vibrations or shocks.
2.
The throttle valve uses an extremely small orifice for protection
from shock pressure transmitted to the Bourdon tube and other
internal devices, and is therefore sensitive to intrusions of
particles, sludge mist, and other contaminants. For the media,
use clean, dry air that has passed through a mist filter, etc.
Preset marker
●
Small Precision Pressure Gauge
1.
The guaranteed temperature accuracy range is 25°C
±
5 [77
±
9°F]. Check the ambient temperature of the measurement
location before proceeding with measurement.
2.
If the temperature is out of the guaranteed temperature accuracy
range, perform a pressure compensation by multiplying the
ambient temperature by the humidity coefficient 0.05% F.S./°C.
3.
In performing pressure compensation, add plus or minus in
accordance with temperature characteristics, subtractin
when
the temperature is at 30°C or higher, and adding when the
temperature is at 20°C or lower.
Example: The measured value is 0.2MPa and the ambient
temperature is 40°C (the pressure
compensation
value is
±
0.00015MPa)
※
(Even after performance of pressure compensation, there is an error of
±
1% F.S.)
●
Small Pressure Gauge,
Pressure Gauge
Preset markers can be used on the
pressure gauges G1-40 and G3-40.
Rotate the cover ring first to set the low
pressure side, and then set the high
pressure side.
P
0
＝
P
1
±
0.00015
×
(T
1
−
T
2
)
P
0
＝
0.2
−
0.00015
×
10
P
0
＝
0.1985MPa
P
0
: Actual pressure (MPa)
P
1
: Measured pressure (MPa)
T
1
: Guaranteed accuracy temperature (°C)
T
2
: Ambient temperature (°C)
4.
If not performing pressure compensation, the pressure indication
accuracy value is accurate within the operating temperature
range shown on the temperature characteristics graph. Be aware
that the ambient temperature can change the indicated accuracy.
5.
The graph below positions 25°C [77°F] as the standard
temperature, and shows the amount of change from the
indicated accuracy at 25°C [77°F] required for the ambient
temperature to come within the operating temperature range, in
terms of percent of full scale (F.S.).
6.
The temperature characteristic lines shown in the graph below
are representative examples only. Individual products will exhibit
some variance from these lines in terms of characteristics.
7.
The chain line shows the indicated accuracy
±
1% F.S.,
while the dotted line shows the amount of change required
for the ambient temperature to come within the operating
temperature range, calculated using the humidity coefficient. The
figures within the framed area show the compensation range.
-5
+3
+2
+1
0
-1
-2
-3
0
10
25
40
60
50
Ambient temperature
Operating temperature range
% F.S. indicated accuracy
Low pressure
side marker
High pressure
side marker
Cover ring
176
Small Pressure Gauge, Pressure Gauge, Panel
Mounting Pressure Gauge
Small Precision Pressure Gauge,
V
acuum Gauge
Mounting and piping
●
Small Pressure Gauge, Pressure Gauge, Small Precision
Pressure Gauge,
V
acuum Gauge
1.
While any mounting direction is acceptable, install a throttle
mechanism, etc.,
W
hen mounting bet
w
een a valve and actuator,
or other location
w
here pressure fluctuation can be intense.
2.
When mounting and piping a pressure gauge, never grab the
pressure gauge body for the purpose of tightening. To tighten,
always use a wrench on the hexagonal or square section of the
connection port. The tightening torque should be at 294.2N
･
cm
[26.0in.
・
lbf] or less.
●
Panel Mounting Pressure Gauge
■
Panel Mounting Pressure Gauge (GP1-
4
0, GP
-4
0,
GPV-40)
1.
When mounting the panel mounting pressure gauge on a panel,
machine the mounting holes in accordance with the panel cut
dimensions. (See the panel cut dimensions)
2.
Since the panel mounting pressure gauge in its packaged
condition already has the pressure gauge assembled into the
panel mount assembly, always remove the mounting ring from
the assembly and then mount on a panel for use.
3.
When mounting on a panel, first align the convex section of the
back side of the panel mounting case flange to the small hole
used for positioning on the panel cut hole (see Figure 1).
4.
The tightening torque for the mounting ring used to secure
the panel mounting case in position should be 980.7N
･
cm
[86.8in.
・
lbf] or less.
5.
If removing the pressure gauge itself from the panel mounting
case, first remove the mounting ring, and then pull up on the tab
located on the bottom of the panel mount case. The pressure
gauge can now be easily removed by pushing it out. Be aware
that forcibly attempting to remove the pressure gauge without
first pulling on the tab could damage the convex section inside
the tab that is used to prevent falling. (see Figure 2)
■
Panel mounting assembly (PM-40)
If purchasing the pressure gauge and panel
mounting assembly separately, take the
following steps when combining them to use as
the panel mounting pressure gauge.
1.
Remove the mounting ring from the panel
mounting case, and insert the square part of
the pressure gauge connection port into the
square part at the bottom of the case.
2.
When inserting, check that (1) the two set screws on the back of
the pressure gauge case are on the lower side, and (2) two set
screw holes are found on the bottom of the panel mounting
case's square part. After confirming the above two items, push in
the pressure gauge.
3.
With the unit in the inserted position, check to see that the
convex section at the bottom of the panel mounting case that is
used to prevent falling is inserted into the mounting hole (
φ
2.3)
[0.091in.] at the bottom of the pressure gauge case. If the
pressure gauge and panel mounting case have been assembled
correctly, the insertion tab will snap smoothly into place. If it does
not go in smoothly, lift up on the tab and the unit should then
slide in easier (see Figure 3).
Figure 1
Figure 2
Figure 3
(
PM-40
)
Handling Instructions and Precautions
Convex portion
Convex portion
(opposite side)
Panel mounting case
Panel cut hole
Small hole used
for positioning
Insertion tab
φ
2.3 Mounting hole