G - Physics – 01 – D
Patent
G - Physics
01
D
354/30
G01D 18/00 (2006.01) G01L 27/00 (2006.01) G08C 19/02 (2006.01)
Patent
CA 1228924
APPLICATION OF J. R. MALLOY AND A. M. OLSEN A METHOD OF DIGITAL PROCESS VARIABLE TRANSMITTER CALIBRATION AND A PROCESS VARIABLE TRANSMITTER SYSTEM UTILIZING THE SAME ABSTRACT A method of digital process variable transmitter calibration includes the steps of sensing the process variable (PV) to produce an analog output which is converted to a digital signal representation. The digital signal is corrected by a microprocessor using a characterization equation previously individually developed during a manufacturing testing of the process variable transmitter over a predetermined range of environmental stimuli to ascertain the coefficients for a polynomial in the form of PV = Ao + A1P + A2P2 +...AiPi. Thus, the digital computer produces a process variable representation as a modified digital output. Subsequently, the digital output from the computer is converted to a conventional 4-20 mA analog signal for use as a process control signal. The process variable transmitter apparatus utilizing the aforesaid method includes means for receiving an output from a process variable sensor, an analog-to-digital converter for converting the received output from the sensor to a digital representation, a digital computer, a non-volatile memory for storing an individualized correction equation determined during the manufacturing testing of the transmitter and a digital-to-analog converter for converting the computer output to an analog control signal.
473154
Malloy John R.
Olsen Arthur M.
Honeywell Inc.
Smart & Biggar
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