Temperature measurement is an important aspect of many industrial processes. Whether you are monitoring the temperature of a liquid or gas, creating a product and need to track the temperature to ensure quality, or trying to maintain a specific temperature on a production line to ensure that products are manufactured within regulations, accurate and reliable measurements are essential. There are a variety of technologies for measuring temperature, converting temperature, and displaying temperature, each with its own advantages and disadvantages. Fuji Electric has developed a wide range of temperature sensors, converters, and indicators to meet the requirements of your industrial applications.
Resistance thermometers, also called RTDs or resistance temperature detectors, are one of the most popular types of temperature sensors. They are used in a wide range of industries and applications, from the food industry to chemical plants. RTDs are made from materials with high electrical resistance, such as platinum, copper, or nickel. The resistance of the RTD material changes with temperature, so the resistance of the RTD can be used to calculate the temperature.
The most common type of RTD is the PT100, which has a resistance of 100 ohm at 0 °C. The PT1000 has a resistance of 1000 ohm at 0 °C. The PT100 and PT1000 are available in a wide range of accuracy levels, from 0.5% to 0.01%.
They can be used for temperatures ranging from -200 °C to +850 °C, and can be manufactured with 2 wires, 3 wires or 4 wires.
A thermocouple consists of two wires of different metals, connected together at one end. The junction between the two wires is called the hot junction. The other end of the thermocouple wire is connected to a measuring device, such as a multimeter or temperature controller. When the hot junction is heated, a voltage is generated at the measuring device. This voltage is proportional to the temperature difference between the hot junction and the measuring device.
Thermocouples are available in a wide range of metals, such as copper-constantan, iron-constantan and chromel-aluminum. Thermocouples are also available in a variety of accuracy levels, from 0.5% to 0.01%.
They can be used for temperatures up to 2300 °C.
Signal converters and signal conditioners are required to use PT100 resistance thermometers or thermocouple probes with PLCs or other digital devices. The converter converts the signal from the RTD or thermocouple probe into a standard voltage or current signal that can be read by the digital device.
HART temperature transmitters are used in process automation applications to measure, convert and transmit temperature signals from RTDs or thermocouples to PLCs or other digital devices. The transmitter converts the temperature sensor signal to a standard voltage or current signal. The transmitter also has a display that shows the temperature measurement. It also has a HART communication interface that allows the transmitter to be configured and calibrated using a HART Hand held communicator.