5
Operation
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Series 907 Analog Convection Transducer
Instruction Manual - #109070001
5.6 Using the Series 907 Transducer with Computers
The 907 is designed to operate in highly automated systems, especially those that are controlled by
digital computers. It is compatible with many different computers, interfaces, and software
programs.
Analog-to-Digital (A/D) Converter
To take full advantage of the 907’s capabilities, an A/D converter should be used with an input
voltage span of 0 to 6 V. The A/D conversion rate should be at least 6 Hz (150 msec conversion
time). A resolution of 12 bits is needed, corresponding to 1.46 mV per bit. The A/D converter
should have a differential input to ensure accurate measurements.
Equations for Converting Voltage to Pressure
The following equations convert the voltage reading V in volts to a pressure reading P in Torr. The
voltage must be within the domain of the equation or an incorrect pressure reading will result.
Figure 5-4: Converting Voltage to Pressure
