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Instruction Manual
6 Analog Output
The CCM502 provides a 0 to 8 Vdc, 1 V/decade log-linear signal proportional to pressure.
A) The log-linear output signal and pressure are related by the
following formulas when units of measurement is in Torr and mbar:
(volts – 10)
P= 10
V= log
Where P is the pressure in Torr or mbar, and V is the output signal
in volts.
B) The log-linear output signal and pressure are related by the
following formulas when units of measurement is in pascals:
(volts - 8)
P= 10
V= log
Where P is the pressure in pascals, and V is the output signal in
volts.
The output voltage is +10 Vdc under the following conditions:
1) The sensor is turned off.
2) The gauge has not stabilized and no valid pressure signal is
detected.
The following chart shows the graphical results of 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
(P) + 10
10
(P) + 8
10
CCM502 Hornet
Log-Linear Analog Output
Pressure (Torr)
Voltage
1.00E-09
1.00E-08
1.00E-07
1.00E-06
1.00E-05
1.00E-04
1.00E-03
7.60E-03
Sensor is off
10.00
+ 10 VDC
See the
described above
which cause the
output to switch
to + 10VDC.
1.00
2.00
3.00
4.00
5.00
6.00
7.00
7.88
conditions
Page 16
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