公开(公告)号：CA2801464A1

公开(公告)日：2011-12-15

申请号：CA2801464

申请日：2011-06-01

Applicant: ROSEMOUNT INC

Inventor： RUD JASON H ,  HOLMSTADT CLARENCE

IPC: G01K7/02

Abstract: A process variable transmitter (10) for measuring a temperature of an industrial process, includes a first electrical connector (1) configured to couple to a first wire of a thermocouple, the first electrical connector (1) includes a first electrode (1A) and a second electrode (IB). The first and second electrodes are configured to electrically couple to the first wire (18B) of the thermocouple. A second electrical connector (2) is configured to couple to a second wire (18A) of the thermocouple, the second electrical connector (2) includes a third electrode (2A) and a fourth electrode (2B). The third and fourth electrodes are configured to electrically couple to the second wire (18A) of the thermocouple. The second wire is of a different material than the first wire. Measurement circuitry (28) is coupled to the first and second electrical connectors configured to provide an output related to a temperature of the thermocouple. The measurement circuitry is further configured to identify polarity of thermocouple based upon at least one measurement taken between at least two of the first, second, third and fourth electrodes.

公开(公告)号：CA2801464C

公开(公告)日：2015-10-06

申请号：CA2801464

申请日：2011-06-01

Applicant: ROSEMOUNT INC

Inventor： RUD JASON H ,  HOLMSTADT CLARENCE

IPC: G01K7/02

Abstract: A process variable transmitter for measuring a temperature of an industrial process, includes a first electrical connector configured to couple to a first wire of a thermocouple. The first connector includes first and second electrodes which are configured to electrically couple to the first wire. A second electrical connector is configured to couple to a second wire of the thermocouple, the second connector includes third and fourth electrodes. The third and fourth electrodes are configured to electrically couple to the second wire. The second wire is of a different material than the first wire. Measurement circuitry is coupled to the first and second electrical connectors and configured to provide an output related to a temperature of the thermocouple. The measurement circuitry is further configured to identify polarity of the thermocouple based upon at least one measurement taken between at least two of the first, second, third and fourth electrodes.