Instrutech CVM-211 User Manual page 15

Instruction Manual
Table 2 - Log-Linear Analog Output Voltage vs Pressure, for Selected Gases
The following Stinger part numbers ending with the letter "L" provide a Non-Linear Analog output:
CVM211GAL,CVM211GBL
True
Pressure N2
(Torr)
0.0001 1.000
0.0002 1.301
0.0005 1.699
0.0010 2.000
0.0020 2.301
0.0050 2.699
0.0100 3.000
0.0200 3.301
0.0500 3.699
0.1000 4.000
0.2000 4.301
0.5000 4.699
1.0000 5.000
2.0000 5.301
5.0000 5.699
10.0000 6.000
20.0000 6.301
50.0000 6.699
100.0000 7.000
200.0000 7.301
300.0000 7.477
400.0000 7.602
500.0000 7.699
600.0000 7.778
700.0000 7.845
760.0000 7.881
800.0000 7.903
900.0000 7.954
1000.0000 8.000
The log-linear output signal and pressure are related by the following formulas:
(V - 5)
P = 10
where P is the pressure in Torr, and V is the output signal in Volts.
The chart on the following page shows the graphical results of the table and formulas above. Pressure is plotted
on the X-axis with a log scale; the output signal is plotted on the Y-axis on a linear scale.
InstruTech, Inc
InstruTech CVM-211 "Stinger" Convection Vacuum Gauge Module
to...CVM211GHL.
Ar He O2
1.000 1.000 1.000
1.301 1.301 1.301
1.699 1.699 1.699
1.845 1.903 2.000
2.146 2.204 2.301
2.519 2.602 2.699
2.820 2.908 2.987
3.117 3.207 3.297
3.511 3.607 3.692
3.808 3.914 3.988
4.100 4.217 4.288
4.494 4.638 4.687
4.778 4.973 4.987
5.057 5.346 5.288
5.389 6.130 5.697
5.602 8.041 6.013
5.763 8.041 6.348
5.895 8.041 6.890
5.946 8.041 7.320
5.991 8.041 7.470
6.053 8.041 7.580
6.130 8.041 7.686
6.207 8.041 7.781
6.274 8.041 7.863
6.338 8.041 7.934
6.375 8.041 7.974
6.400 8.041 7.999
6.455 8.041 8.041
6.512 8.041 8.041
V = log (P) + 5
10
CO2 Kr Freon12 Freon22
1.000 1.000 1.000
1.301 1.301 1.301
1.699 1.477 1.699
2.041 1.602 2.176
2.362 2.000 2.491
2.643 2.362 2.881
3.041 2.681 3.167
3.346 2.978 3.476
3.740 3.371 3.860
4.029 3.670 4.155
4.322 3.960 4.439
4.689 4.336 4.786
4.978 4.602 5.021
5.233 4.845 5.210
5.524 5.107 5.389
5.696 5.250 5.471
5.819 5.360 5.521
5.915 5.410 5.579
5.966 5.438 5.670
6.090 5.521 5.777
6.228 5.555 5.838
6.350 5.595 5.883
6.458 5.624 5.918
6.561 5.647 5.947
6.664 5.667 5.974
6.732 5.677 5.989
6.774 5.685 5.998
6.900 5.698 6.021
7.045 5.706 6.045
D2 Ne
1.000 1.000 1.000
1.301 1.301 1.301
1.699 1.699 1.699
2.176 2.114 1.845
2.491 2.380 2.176
2.845 2.778 2.544
3.130 3.083 2.851
3.435 3.386 3.149
3.839 3.778 3.542
4.134 4.083 3.845
4.418 4.398 4.149
4.774 4.837 4.555
5.017 5.190 4.872
5.220 5.616 5.201
5.418 7.391 5.719
5.530 8.041 6.332
5.571 8.041 7.766
5.617 8.041 8.041
5.691 8.041 8.041
5.808 8.041 8.041
5.876 8.041 8.041
5.925 8.041 8.041
5.964 8.041 8.041
5.998 8.041 8.041
6.029 8.041 8.041
6.045 8.041 8.041
6.057 8.041 8.041
6.079 8.041 8.041
6.104 8.041 8.041
CH4
1.000
1.301
1.699
2.230
2.519
2.886
3.185
3.483
3.888
4.201
4.498
4.893
5.204
5.522
5.877
6.446
7.550
7.925
8.041
8.041
8.041
8.041
8.041
8.041
8.041
8.041
8.041
8.041
8.041
page 15