The comparison of bimetallic thermometer and glass thermometer

The difference between bimetallic thermometer and glass thermometer? A lot of people think is not very clear, they are the same, actually otherwise. Bimetallic thermometer and glass thermometer difference performance in many aspects, such as the working principle, using environment, measurement range, and so on. In order to help you better understand, small make up for the next will be from different aspects to introduce the difference between bimetallic thermometer and glass thermometer. 1, the working principle, bimetallic thermometer is the use of two different metals in expansion degree of temperature changes of different working principle; Glass thermometer is according to alcohol, mercury and the heat from the cold of the liquid, such as 2, made of the principle of the measuring range, bimetallic thermometer measurement range is - 80 ~ 600 ℃, permissible error are two process about 1% of the scale; Due to the melting point of mercury - 39. 3 ℃, boiling point 357 ℃, so the glass between the scope of the range of the thermometer. 3, operation method, bimetallic thermometer is composed of bimetallic strip, two different kinds of metal hot deformation coefficient, temperature deformation can be created to drive the corresponding instrument pointer or potential change; And glass thermometer with a curved duct of mercury, when the temperature drops, mercury will automatically disconnect in bending place, retain the original degree, use again in order to ensure accurate readings, should help to make it to zero. 4, working environment, bimetallic thermometer is a kind of field detection instrument, is widely used in petroleum, chemical, machinery, ships, electricity, textile, printing and dyeing and other industrial and scientific research departments; Glass thermometer is often used in medical, laboratory, often used in the cervix temperature. The difference between bimetallic thermometer and glass thermometer, the above four small make up according to the experience summary for everyone. After know will help you avoid mistakes in the use of the usual use, so as not to cause error, affect the measurement result.