What circumstance can cause mechanical thermometer have error?

Mechanical thermometer, also called double metal thermometer, is widely used in petroleum, chemical, machinery, ships, electricity, textile, printing and dyeing and other industrial and scientific research departments and other fields. So to the requirement of its precision is quite high. In general, we will regularly for mechanical thermometer input validation. As a professional thermometer manufacturers, in the process of checking for many times, we also summarized the cause of mechanical error of the thermometer five aspects: 1. The precision of the thermometer itself level, level is high, the temperature range of small 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, known as the dot, dot liquid to flow over the location. 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. Mechanical thermometer is widely used in petroleum, chemical industry, machinery, ships, electricity, textile, printing and dyeing and other industrial and scientific research departments and other fields. So to the accuracy requirement of the machinery is a thermometer.