Key points for selecting and installing bimetallic thermometers

Thread Content

This post was last edited by B0SS on 2019-3-1 17:43. When selecting a bimetallic thermometer, it is necessary to take into full account the actual application environment and requirements, such as dial diameter, accuracy grade, mounting method, type of medium being measured, and environmental hazards. In addition, factors such as cost-performance and maintenance workload also need to be taken into account. In addition, the following points should be noted when using bimetallic thermometers: 1. The length of the protective tube of the bimetallic thermometer that is submerged in the medium being measured must be greater than the length of the temperature-sensing element; generally, this immersion length should be over 100 mm, and for a measurement range of 0–50°C, it should be over 150 mm, in order to ensure accurate measurements. 2. Various types of bimetallic thermometers should not be used to measure the temperature of fluids in open containers, and thermometers with electric contacts should not be employed in control circuits where there is significant mechanical vibration. 3. When storing, using, installing, or transporting bimetallic thermometers, care should be taken to avoid damaging the protective tube; the tube must not be bent or deformed, and the thermometer must not be used as a wrench. 4. Bimetallic thermometers should be regularly inspected under normal operating conditions. It is generally advisable to do it every six months. Electrical contact thermometers must not be used in conditions of severe vibration, to avoid affecting the reliability of the contacts. 5. The temperature at which the instrument operates regularly should preferably be within the range of 1/3 to 2/3 of its scale.