What are the factors caused by mechanical error thermometer?

Mechanical thermometer is one of the specialized measuring temperature of low temperature, it can directly measure - The temperature of 50 to 500 c, it is also called double metal thermometer. Widely used in petroleum, chemical industry, machinery, ships, electricity, textile, printing and dyeing and other industrial and scientific research departments and other fields. As a temperature meter, in order to guarantee the measurement precision, we need to check on a regular basis. So what are the cause of mechanical error of the thermometer? We as a professional thermometer manufacturers, sort out the following five kinds of factors: 1. High precision of the thermometer itself level, level of relative error is much smaller. 2. Heat pipe is sheath maerial of insertion depth, the original depth must be over the temperature of the thermometer ( More than two-thirds of heat tube length) , usually will have a sheath maerial pits, liquid to flow over the pits. 3. Thermal sheath maerial of material, different material heat of reaction time and cooling degree will lead to different precision error is different. 4. Whether the thermometer with a sheath, sheath thickness and material of different can also lead to the reading error of the thermometer and reaction time. 5. Using the environment also can affect.