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Instruction Manual
Coefficients for voltage segment range of 7.6465 to 7.9102 volts
Example: Measured analog output voltage is: V
Since analog output in this example is 5.6243 V, use the Coefficients from the fourth table shown in the previous page:
K
= -3.777930E+01, K
= +5.495931E-02, K
0
1
Use equation from the previous page; P = K
P = Pressure = 5.00 Torr
The following pressure vs. voltage table is derived from equations and coefficients listed above.
NONLIN 9V, Non-Linear Output Voltage vs. Pressure in Torr units for N
Pressure
(Torr)
0.0000
1.0E-04
2.0E-04
5.0E-04
1.0E-03
2.0E-03
5.0E-03
1.0E-02
2.0E-02
5.0E-02
1.0E-01
An analog output of 10 volts indicates a faulty convection gauge or unplugged gauge cable.
InstruTech, Inc.
K
0
K
1
K
2
K
3
Coefficients for voltage segment range of 7.9102 to 9 volts
K
0
K
1
K
2
K
3
= 5.6243 V.
1
= -2.652588E-05, K
2
+ K
(454.67*V
0
1
Voltage
Pressure
(Vdc)
(Torr)
0.0000
2.0E-01
0.0016
5.0E-01
0.0031
1.0E+00
0.0077
2.0E+00
0.0153
5.0E+00
0.0302
1.0E+01
0.0727
2.0E+01
0.1385
5.0E+01
0.2536
1.0E+02
0.5260
2.0E+02
0.8583
3.0E+02
K
= +1.811462E+06
0
K
= -1.511014E+03
1
K
= +4.196562E-01
2
K
= -3.880208E-05
3
K
= -2.417225E+05
0
K
= +1.919958E+02
1
K
= -5.106048E-02
2
K
= +4.554342E-06
3
= +4.526774E-09
3
2
)+ K
(454.67*V
)
+ K
(454.67*V
1
2
1
3
Voltage
Pressure
(Vdc)
(Torr)
1.3310
4.0E+02
2.2289
5.0E+02
3.1352
6.0E+02
4.1968
7.0E+02
5.6243
7.6E+02
6.5245
8.0E+02
7.1531
9.0E+02
7.6145
1.0E+03
7.7804
7.9102
8.0743
VGC301 Controller
3
)
1
/Air
2
Voltage
(Vdc)
8.2587
8.4375
8.5915
8.7196
8.7862
8.8271
8.9193
9.0000
Page 34
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