When will the 4 -line RTD temperature sensor be needed?
Some materials (such as platinum, copper, and nickel) resistance will vary at different temperatures. The resistance temperature detector (RTD) uses this feature to evaluate the temperature in various commercial and industrial applications. The three RTDs use the third wire to measure and compensate for some resistance to the resistance of the temperature measurement wire, especially in the case, the temperature sensor is far from the temperature transmitter. The 3 -line RTD is more accurate than the basic 2 -line RTD temperature sensor, which is very suitable for most industrial applications. However, the 3 -line RTD does not consider factors that may affect the resistance value that may affect the sensor. Applying environmental conditions on the lead. The 4 -line RTD temperature sensor adds the fourth line and is used as a real bridge circuit. This 4 -line configuration allows continuous compensation for any lead. The 4 -line RTD is slightly more expensive than the 3 -line RTD temperature sensor, but they are very accurate and duplicate -or even more than the 3 -line RTD temperature sensor.

The 4 -line RTD is a priority selection sensor for laboratory applications with precision, accuracy and repetitiveness. Laboratory application focuses on the process of design, improvement, simplification and testing, and repetition, and then can be used as daily procedures in industrial and commercial applications. Therefore, laboratory applications require good available equipment to ensure the appropriateness, feasibility and quality of the process of implementing the results found in the laboratory. The 4 -line RTD temperature sensor is another field for the best choice. Like the application of laboratory applications, the drawing resistance compensation provided by the 4 -line RTD circuit can provide meaningful accuracy, accuracy, and repetitiveness required to provide meaningful calibration.

There are two options that can connect the 4 -line RTD temperature sensor to PLC.

The first choice is to use the RTD-MA converter.

The RTD-MA converter (transmitter) is usually a better choice to connect the RTD temperature sensor directly to the PLC card.

It is good to use this method.

1. Do not use different types of PLC input cards to reduce costs. 2. Some PLC cards are not allowed to calibrate the RTD channel separately.

Connect the 4 -line RTD temperature sensor to another method of PLC input.

As long as you need to connect the sensor line, you can connect the 4 -wire RTD temperature sensor to the 3 -line input. You can also connect to the 2 -line input by non -connected induction line.

For each induction line you do not connect, the accuracy of temperature measurement in the controller will be reduced.