What are the advantages and disadvantages of pressure type thermometer?

People often use instrument, may know the use of the various instrument, using range and so on, but should also know that can be used in many different areas of different table instead of using, this time to consider what are the strengths and weaknesses of the different instrument! Only in this way, can we need to work, in industrial equipment, arguably the most commonly used instrument is the pressure type thermometer, what are the advantages and disadvantages of it? Today is: the pressure type thermometer is the use of sealed container of liquid, gas or saturated steam heated volume expansion and pressure changes as the signal. Its basic structure is made up of bulb, capillary and indicator of three parts. It is one of the earliest methods of temperature control applied in the production process. Pressure type temperature measuring system now is still on the instructions and control is widely used in the temperature measurement method. Pressure type thermometer is: the advantages of simple structure, high mechanical strength, is not afraid of vibration. The price is low, does not need external energy. Defect is: limited temperature range, generally in - 80~400℃; Heat loss due to slower response time; Instrument sealing system ( Bulb, capillary, spring tube) Damage is difficult to repair, must be replaced. Measuring accuracy are greatly influenced by environmental temperature, temperature package installation location, accuracy is relatively low; Capillary transmission distance limit. Through the introduction to the above pressure type thermometer, is to further understand the pressure type thermometer? Hope I can bring you help!