Temperature transmitter
A temperature transmitter is a device used to sense a temperature and transmit an output representative of the sensed temperature. Process control transmitters are used to measure process parameters in a process control system. Temperature transmitters are used in controlling industrial processes by sensing a temperature of the process and transmitting the information to a remote location. A process temperature transmitter provides an output related to a sensed process substance temperature. The temperature transmitter output can be communicated over the loop to a control room, or the output can be communicated to another process device such that the process can be monitored and controlled. The transmitter injects a current into the temperature sensor and the resultant voltage drop across the temperature sensor is used to measure resistance. The voltage is converted into a digital format using an analog to digital converter and provided to a microprocessor. The microprocessor converts the measured voltage into a digital value representative of temperature. The temperature transmitter generally includes a housing and a temperature probe which attaches to the housing. In order to monitor a process temperature, the transmitter includes a sensor, such as a resistance temperature device (RTD) or a thermocouple. An RTD changes resistance in response to a change in temperature. By measuring the resistance of the RTD, temperature can be calculated. A thermocouple provides a voltage in response to a temperature change. Typically, the temperature transmitter is located in a remote location and coupled to a control room over a 4-20 mA current loop. A temperature sensor is placed in the process fluid and provides an output related to temperature of the process fluid.
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