The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2018
Filed:
Jul. 17, 2017
Magnetrol International, Incorporated, Aurora, IL (US);
Kevin M. Haynes, Lombard, IL (US);
Timothy S. Sussman, Bolingbrook, IL (US);
Magnetrol International, Incorporated, Aurora, IL (US);
Abstract
A loop powered process instrument comprises a control system including a control circuit, a modem circuit and a loop output circuit. The control circuit measures a process variable and develops a measurement signal representing the process variable and includes a loop control circuit and a communication circuit. The modem circuit is operatively connected to the communication circuit and includes a modulation input port and a modulation output port. The loop output circuit receives a measurement signal from the loop control circuit and is connected to the modulation input port. A two-wire circuit is for connection to a remote power source using a two-wire process loop. A power supply with isolation is connected to the two-wire circuit and the loop output circuit to isolate the two-wire circuit from the control system. The power supply receives power from the two-wire process loop and supplies power to the control system and draws loop current on the two-wire process loop in accordance with the measurement signal and provides the modulation output on the loop current. A bypass circuit with isolation is connected between the two-wire circuit and the modem circuit modulation input port for providing input modulated signals to the modem circuit bypassing the power supply.