The causes of errors thermometer

Bimetallic strip bending degree have corresponding relationship with temperature, which can be used to indicate that the bending degree of bimetallic strip temperature. Typically, small expansion coefficient in the bimetallic strip layer called the passive layer, called big expansion coefficient of a layer of active layer. Thermometer for thermometer, a major cause of the error are:

1, environmental conditions, should be in the temperature thermometer was 40 ℃ ~ + 55 ℃, relative humidity is not more than 85% under the conditions of use, otherwise it will cause greater error.

2, mechanical damage in use, the instrument has been heavily impact and collision, easy to cause deformation of the protecting tube, thus affecting the normal work caused by the error of measuring mechanism.

3, fatigue damage after long time use, can make the performance of the sensing element change caused by the error.

4. Insert the thermometer inserted into the dielectric medium depth the depth of the guarantee is greater than the length of the sensing element, if the insertion depth will cause the error.

the above is the main cause of bimetallic temperature and produce error. The thermometer can be used to directly measure the liquefaction, the temperature of the gas. Thermometer compared with domestic similar products: instrument accuracy level is 1. Level 0, instrument shell with anti-corrosion materials, its temperature resistance can be as high as 200 ℃, low da 40℃。 Flange structure, double o-ring seal, the anticorrosion, the waterproof performance is good. Adopts correct measure way to manipulate the thermometer is main way to ensure the measurement accuracy.