76
Doc. Ref. XGC-320-100119
V100 (2019-11)
Note: By design, these values are identical to the outputs from
MKS Instruments / Granville-Phillips
®
Convectron
®
gauges, Mini-
Convectron
®
modules and controllers so that equivalent units
can be interchanged without affecting your process system or
software.
An analog output of 10 volts indicates a faulty convection gauge
or unplugged gauge cable.
7.8
NONLIN 9V; Non-Linear Analog Output
Equations & Table
You may calculate the N
2
/air pressure represented by the
NONLIN 9V, 0 to 9 V non-linear analog output voltage for the
"S-curve" using a multi-segment, n
th
order polynomial function
calculation. Use the coefficients listed in the table below to
calculate pressure using the following equation:
P = K
0
+ K
1
(454.67*V
1
)+ K
2
(454.67*V
1
)
2
+ K
3
(454.67*V
1
)
3
Where P=Pressure in Torr, V1=Analog output voltage
Coefficients for voltage segment range of 0 to 1.8457 volts
K
0
K
0
= +0.00
K
1
K
1
= +1.428571E-04
K
2
K
2
= +2.551020E-07
K
3
K
3
= +9.110787E-11
Coefficients for voltage segment range of 1.8457 to 3.1641 volts
K
0
K
0
= -2.681040E-01
K
1
K
1
= +9.758000E-04
K
2
K
2
= -5.950000E-07
K
3
K
3
= +3.750000E-10