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1. (WO2015047542) INDUSTRIAL PROCESS VARIABLE TRANSMITTER WITH ISOLATED POWER SCAVENGING INTRINSICALLY SAFE PULSE OUTPUT CIRCUITRY

Pub. No.:    WO/2015/047542    International Application No.:    PCT/US2014/049554
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Tue Aug 05 01:59:59 CEST 2014
IPC: H04Q 9/00
G01F 1/58
G01D 21/00
Applicants: ROSEMOUNT INC.
Inventors: HUNTER, Kirk, Allan
LUCHT, Jordan, Dennis
DREIER, Jared, James
ROVNER, Bruce, David
Title: INDUSTRIAL PROCESS VARIABLE TRANSMITTER WITH ISOLATED POWER SCAVENGING INTRINSICALLY SAFE PULSE OUTPUT CIRCUITRY
Abstract:
An industrial process variable transmitter (20) includes a process variable sensor (30, 32) configured to sense a process variable. Measurement circuitry (154) is coupled to the process variable sensor (30, 32) and provides a measured output as a function of the process variable. Output circuitry (158) includes a loop connection configured to couple to a process control loop (160). An optical sensor (200) receives the measured output from the measurement circuitry (154). A switching device (190) applies pulses to the process control loop (160) in response to an output from the optical sensor (20). Power supply circuitry (192) powers the optical sensor (200), a comparator (214), and/or the switching device (190) with power received from the process control loop (160) and loop connection.