Bimetallic thermometer and pressure type thermometer thermometer factory group contrast

Bimetallic thermometer and pressure type thermometer is the classification of the thermometer, so everyone is clear on the difference between the bimetallic thermometer and pressure type thermometer? Sensor network in China under the expert to introduce you to the contrast of bimetallic thermometer and pressure type thermometer knowledge. Bimetallic thermometer bimetallic thermometer is a kind of measurement in the field of low temperature test instrument. Bimetallic thermometer can be directly measured in the process of various production - 80 ℃ ~ + 500 ℃ within the scope of liquid, steam and gas medium temperature. The bimetallic thermometer pointer plate with the direction of protecting tube connection bimetallic thermometer can be divided into axial, radial and 135 ° to the model and universal model. In order to meet the needs of practical production, bimetallic thermometer has different installation fixed form: movable external thread pipe joint, movable threaded pipe joints, fixed nipple, card sets of nipple, flange joint and a fixed flange. Pressure type thermometer thermometer, 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. Pressure thermometer often work scope should be 1/2-3/4 of the measuring range, and as far as possible make the display tables and bulb in a horizontal position. Install it using the bulb installation bolt can make the temperature loss caused by inaccurate, when installation should be heat preservation processing, and try to make the bulb work without vibration environment.