The thermometer was first invented by Galileo in Italy from 1643 to 1592. His first thermometer was a glass tube with an open end and a glass bubble the size of a walnut at the other end. When in use, first heat the glass bubble, and then insert the glass tube into the water. With the change of temperature, the water surface in the glass tube will move up and down.

The Rosemount 248 temperature transmitter monitoring assembly is designed to meet the requirements of temperature monitoring applications. The top-mounted transmitter using HART protocol can be ordered with a variety of sensors, top junction boxes and thermowells. All these products are designed with Rosemount products that can provide accurate and reliable readings.