Temperature measurement and transmitters
Temperature is the measure of the degree of hotness or coldness of something. Temperature measurement is an important task in the process industry and can be achieved with the aid of a sensor and transmitter. Common sensors are resistant temperature detectors (RTDs) and thermocouples.
An RTD is a device whose resistance changes as the temperature changes. It has a temperature range of -260 to 850 degrees Celsius. It has better sensitivity than a thermocouple but it is more expensive. The types of RTD sensors, when categorized by the resistant element material, are Pt100, Pt1000, Ni120, and Cu100. The letters represent the material of the element while the number represents the resistance at 0 degrees Celsius. Pt100 is the most common RTD. The resistance element is Platinum and it has a resistance of 100 Ohms at 0 degrees Celsius.
An RTD temperature sensor requires an RTD transmitter to produce a standard signal output (for example, 4 to...