D U N I W A Y S T O C K R O O M C O R P .
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P. CVT/ Convection Gauge with Other Gases
If you need to measure the pressure of gases other than air/nitrogen, refer to the following table:
True
Indicated Pressure on Model 960 Display, Torr
Pressure
Torr
Argon* CO2
Deuterium Freon 12 Freon 22 Helium Krypton
Methane Neon
Oxygen
0
0
0
0
0
0
0
0
0
0
0
0.0001
0.0001 0.0001 0.0001
0.0001
0.0001
0.0000 0.0000
0.0002
0.0001 0.0001
0.0002
0.0001 0.0002 0.0002
0.0003
0.0002
0.0002 0.0002
0.0003
0.0001 0.0002
0.0005
0.0003 0.0006 0.0006
0.0008
0.0007
0.0004 0.0003
0.0008
0.0003 0.0005
0.001
0.0007 0.0011 0.0019
0.0015
0.0014
0.0008 0.0005
0.0018
0.0007 0.0010
0.002
0.0013 0.0023 0.0024
0.0030
0.0029
0.0016 0.0010
0.0032
0.0014 0.0020
0.005
0.0033 0.0055 0.0060
0.0075
0.0068
0.0040 0.0023
0.0077
0.0035 0.0049
0.01
0.0065 0.0109 0.0120
0.0147
0.0135
0.0080 0.0046
0.0152
0.0070 0.0097
0.02
0.014
0.022
0.024
0.030
0.027
0.016
0.009
0.031
0.014
0.020
0.05
0.033
0.055
0.060
0.073
0.069
0.041
0.024
0.077
0.035
0.049
0.1
0.064
0.107
0.120
0.142
0.136
0.082
0.046
0.158
0.070
0.097
0.2
0.126
0.208
0.247
0.270
0.259
0.163
0.085
0.310
0.140
0.192
0.5
0.307
0.494
0.673
0.599
0.582
0.427
0.214
0.764
0.353
0.477
1
0.59
0.93
1.51
1.03
1.01
0.92
0.39
1.56
0.73
0.95
2
1.12
1.67
4.02
1.59
1.62
2.16
0.68
3.23
1.60
1.90
5
2.36
3.24
261
2.38
2.54
13.2
1.25
13.3
5.10
4.85
10
3.86
4.84
2.86
3.29
1.74
28.6
21.5
10.1
20
5.67
6.39
3.21
3.61
2.23
359
584
22.4
50
7.72
8.00
3.68
4.02
2.50
845
85.7
100
8.71
9.02
4.56
4.78
2.66
226
200
9.65
12.0
5.81
6.23
3.07
303
300
11.1
16.8
6.69
7.31
3.49
383
500
15.9
29.4
8.06
8.98
4.10
603
700
21.9
48.8
9.20
10.4
4.60
861
760
23.9
56.0
9.52
10.8
4.63
943
900
29.2
88.2
10.2
11.7
1000
33.8
129
10.8
12.4
Figure 11: CVT Indicated vs. True Pressure for Gases Other Than Nitrogen
For example, if you are measuring the pressure in a system that is backfilled with carbon dioxide
(CO
2
), and the Model 960 display shows an indicated pressure of 56 Torr, the true pressure is 760
Torr. If the indicated pressure is 22 mTorr (0.022 Torr), the true pressure is 20 mTorr (0.02 Torr).
These data were compiled from a variety of sources and are believed to be reliable, however Du-
niway Stockroom Corp. takes no responsibility for errors in the data. If your application is critical,
we suggest you use the services of an independent laboratory to calibrate the CVT-275 gauge and
Model 960 controller to your specific application.
TELEPHONE: 650-969-8811 TOLL-FREE (U.S. only): 800-446-8811 FAX: 650-965-0764 EMAIL: [email protected]
www.duniway.com
