Circuit diagram of platinum resistance temperature transmitter

Photocoupler

Platinum resistance temperature transmitter circuit

Platinum thermal resistance, referred to as platinum resistance, its resistance will change with temperature. It has PT100HE PT1000 and other products. A 100 after PT means that it has a resistance of 100 ohms at 0 ° C and a resistance of about 138.5 ohms at 100 ° C. Its industrial principle: When the PT100 is at 0 degrees Celsius, its resistance is 100 ohms, and its resistance will increase with temperature as its resistance increases.