The two wires of PT100 can be connected to the input terminal of the meter, and generally the input type on the meter is also set to PT100.
Pt100 is a platinum RTD, and its resistance is directly proportional to the change of the temperature.
Pt100's resistance is related to the change of the temperature as follows: when the temperature of the PT100 is 0 ℃, it is 100 ohms, and at 100 ℃, it is about 138.5 ohms. resistance value is about 138.5 ohms.
Its industrial principle: when the PT100 in 0 degrees Celsius when his resistance value of 100 ohms, its resistance will rise with the temperature and become a uniform growth
extended information: There are two-wire, three-wire and four-wire RTDs. This article describes the characteristics and wiring of 4-wire RTDs, please refer to other documents for other wiring systems. Four-wire system: Two lead wires are connected to each end of the resistance wire of the RTD body. When measuring temperature, it can not only eliminate the influence of the resistance of the lead wires, but also eliminate the influence of the contact resistance between the connecting wires and their resistance value changes. The four-wire system is mostly used in the lead wires of standard platinum resistors. The two-wire and three-wire systems are measured by the bridge method, which finally gives the relationship between the temperature value and the analog output value. The four-wire does not have a bridge, it is completely just sent with a constant current source, measured by a voltmeter, and finally gives the measured resistance value. Baidu Encyclopedia - RTD