The rotary thermometer is made of a coiled bimetallic sheet. One end of the bimetallic sheet is fixed, and the other end is connected with the pointer. Due to the different expansion degree of the two metal sheets, the crimp degree of the bimetallic sheet is different at different temperatures, and the pointer then points to different positions on the dial. The temperature can be known from the reading on the dial.

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.