Calibration of process control temperature transmitter
First Claim
1. A calibrator for calibrating a temperature transmitter in a process control loop, comprising:
- a NIST traceable reference;
a plurality of electrical connectors adapted for electrically connecting to a terminal block of the transmitter;
circuitry for coupling to the process control loop and transmitting values of the NIST traceable reference to the transmitter; and
a switch connected for selectively coupling the NIST traceable reference to the plurality of electrical connectors.
0 Assignments
0 Petitions
Accused Products
Abstract
A transmitter in a process control loop measures temperature. A calibrator includes a known calibration element which is connected to the transmitter. Software in the transmitter compares a measured value of the calibration element with the actual value of the calibration element and responsively calibrates the transmitter. The calibrator includes a temperature calibration sensor for coupling to a terminal block of the transmitter. The temperature calibration sensor provides an actual temperature input to the transmitter. The transmitter measures actual temperature of the terminal block and compares actual temperature with a temperature measured by an internal terminal block temperature sensor, and responsively calibrates the internal temperature sensor.
112 Citations
12 Claims
-
1. A calibrator for calibrating a temperature transmitter in a process control loop, comprising:
-
a NIST traceable reference; a plurality of electrical connectors adapted for electrically connecting to a terminal block of the transmitter; circuitry for coupling to the process control loop and transmitting values of the NIST traceable reference to the transmitter; and a switch connected for selectively coupling the NIST traceable reference to the plurality of electrical connectors. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of calibrating a temperature transmitter in a process control loop, comprising:
-
connecting an input of the transmitter to a NIST traceable reference; transmitting the value of the NIST traceable reference to the transmitter; comparing the communicated value of the NIST traceable reference with a measured value of the NIST traceable reference; and responsively calibrating the temperature transmitter based upon the comparison. - View Dependent Claims (7, 8, 9, 10, 11, 12)
-
Specification