|
¡¡ |
|
Pressure
Conversion Table |
|
Kg/cm2 |
bar |
atm |
Psi
ib/in2 |
KPa |
MERCURY |
WATER |
|
Hg |
H2O
(Aq) |
|
m |
in |
m |
ft |
|
1 |
0.9807 |
0.9678 |
14.22 |
98.07 |
0.7356 |
28.96 |
10.000 |
32.81 |
|
1.0197 |
1 |
0.9869 |
14.50 |
100.00 |
0.7501 |
29.53 |
10.197 |
33.43 |
|
1.0332 |
1.0133 |
1 |
14.70 |
101.32 |
0.760 |
29.92 |
10.33 |
33.90 |
|
0.0703 |
0.0689 |
0.0680 |
1 |
6.894 |
0.0517 |
2.036 |
0.703 |
2.31 |
|
0.0102 |
0.0100 |
0.0099 |
0.1451 |
1 |
0.0075 |
0.2959 |
0.1020 |
0.3343 |
|
1.3595 |
1.3332 |
1.3158 |
19.34 |
133.32 |
1 |
39.37 |
13.6 |
44.60 |
|
0.0345 |
0.0338 |
0.0334 |
0.491 |
3.383 |
0.0254 |
1 |
0.345 |
1.133 |
|
0.1000 |
0.0981 |
0.0967 |
1.422 |
9.807 |
0.0735 |
2.896 |
1 |
3.281 |
|
0.0305 |
0.0299 |
0.0295 |
0.4335 |
2.991 |
0.0224 |
0.88 |
0.305 |
1 |
|
Pressure Range
A gauge range of twice the normal working pressure is generally
selected. The maximum operating pressure in all cases should be limited
to 75% of the gauge range. Where alternating pressure and pulsation are
encountered, working pressure should be limited to 2/3 of the gauge
range.
The commonly used pressure ranges are:
Denotes full scale range in psi measurement, low pressure in Mbar.
0-6Mbar, 0-10Mbar, 0-16Mbar, 0-25Mbar, 0-40Mbar, 0-60Mbar, 0-100Mbar,
0-160Mbar, 0-250Mbar, 0-400Mbar, 0-600Mbar, -15psi-0, 0-15psi, 0-30psi,
0-60psi, 0-100psi, 0-150psi, 0-160psi, 0-200psi, 0-300psi, 0-400psi,
0-600psi, 0-1000psi, 0-1500psi, 0-2000psi, 0-3000psi, 0-4000psi,
0-5000psi, 0-6000psi, 0-8500psi, 0-10000psi, 0-15000psi
¡¡ |
|
Pressure Gauge Accuracy
|
Accuracy is defined as the conformity of an indication to its true
value. Accuracy is a percentage of the full range. For example, a gauge
that has a scale of 0-300 psi with an accuracy of ¡À1% would mean that
the gauge is accurate to within ¡À (plus or minus) 3 psi.
Accuracy Grades - ASME B40.1 (American Society of Mechanical Engineers) |
|
Accuracy grade
|
Lower 1/4 of scale
|
Middle 1/2 of scale
|
Upper 1/4 of scale
|
|
4A
|
0.1
|
0.1
|
0.1
|
|
3A
|
0.25
|
0.25
|
0.25
|
|
2A
|
0.5
|
0.5
|
0.5
|
|
1A
|
1
|
1
|
1
|
|
A
|
2
|
1
|
2
|
|
B
|
3
|
2
|
3
|
|
C
|
4
|
3
|
4
|
|
D
|
5
|
5
|
5
|
|
Accuracy
Gauges are available with accuracies from +/-3/2/3% to 0.1% of span (ASME
grade B to grade 4A) Gauges with +/-3/2/3% of span accuracy offer a
+/-2% of span accuracy over the middle third of the scale and +/-3% of
span on the balance of the scale. Generally, bourdon tube gauges with
better accuracies are larger and more expensive.
ASME B40.1
GRADE ACCURACY
4A +/-0.1% Full Scale
3A +/-0.25% Full Scale
2A +/-0.50% Full Scale
1A +/-0.105% Full Scale
A +/-2-1-2% +/-1% over middle of scale, +/-2% over first and last 1/4 of
scale
B +/-3-2-3% +/-2% over middle of scale, +/-3% over first and last 1/4 of
scale
C +/-4-3-4% +/-3% over middle of scale, +/-4% over first and last 1/4 of
scale
¡¡ |
|
Temperature Conversion Table
|
| C |
F |
|
C |
F |
|
C |
F |
| -240 |
-400 |
|
2 |
35.6 |
|
120 |
248 |
| -220 |
-364 |
|
4 |
39.2 |
|
130 |
266 |
| -200 |
-328 |
|
6 |
42.8 |
|
140 |
284 |
| -180 |
-292 |
|
8 |
46.4 |
|
150 |
302 |
| -160 |
-256 |
|
10 |
50 |
|
160 |
320 |
| -140 |
-220 |
|
15 |
59 |
|
170 |
338 |
| -120 |
-184 |
|
20 |
68 |
|
180 |
356 |
| -100 |
-148 |
|
25 |
77 |
|
190 |
374 |
| -80 |
-112 |
|
30 |
86 |
|
200 |
392 |
| -60 |
-76 |
|
35 |
95 |
|
220 |
428 |
| -50 |
-58 |
|
40 |
104 |
|
240 |
464 |
| -45 |
-49 |
|
45 |
113 |
|
260 |
500 |
| -40 |
-40 |
|
50 |
122 |
|
280 |
536 |
| -35 |
-31 |
|
55 |
131 |
|
300 |
572 |
| -30 |
-22 |
|
60 |
140 |
|
320 |
608 |
| -25 |
-13 |
|
65 |
149 |
|
340 |
644 |
| -20 |
-4 |
|
70 |
158 |
|
360 |
680 |
| -15 |
5 |
|
75 |
167 |
|
380 |
716 |
| -10 |
14 |
|
80 |
176 |
|
400 |
752 |
| -8 |
17.6 |
|
85 |
185 |
|
420 |
788 |
| -6 |
21.2 |
|
90 |
194 |
|
440 |
824 |
| -4 |
24.8 |
|
95 |
203 |
|
460 |
860 |
| -2 |
28.4 |
|
100 |
212 |
|
480 |
896 |
| 0 |
32 |
|
110 |
230 |
|
| |
| Basic
formula: ºC = 5/9 (ºF - 32) and ºF = 9/5 (ºC+32) |
|
Copyright © 2003-2005,
Cixi Ningfeng Pressure Gauge Factory,
TBP
All rights reserved.
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