The classification of the bimetallic thermometer1

Classification: 1, according to 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. (1) the axial type bimetallic thermometer: pointer vertical connection tube plate and protection. (2) the radial type bimetallic thermometer: pointer GuanPing line connection plate and protection. (3) type 135 ° to the bimetallic thermometer: pointer plate connected to protection tube into 135 °. (4) universal type bimetallic thermometer: pointer plate connected to the protecting tube Angle can be arbitrary adjustment. 2, 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. 3, the characteristics of the bimetallic thermometer is fast response speed, small volume, good linearity and relatively stable, some products abroad also has high temperature performance. （ 1) Bimetallic thermometer thermoelectric potential size only to the thermoelectric properties of thermal electrode material and temperature difference on both ends. （ 2) Use the same kind of homogeneous conductor or semiconductor circuits, won't produce thermoelectric potential. （ 3) Two thermocouple junction temperature T, T0, if T = T0, the thermocouple thermoelectric potential is zero. Intermediate temperature law laid the foundation for the development of thermocouple indexing table. （ 4) If two conductor A and B, respectively, with A third conductor of thermoelectric has A wide temperature range, the long-term use of physical and chemical properties of stability, 5) High electrical conductivity, small temperature coefficient of resistance; Does the configuration of the thermoelectric potential sensitivity, a linear between thermoelectric potential and temperature, easy to copy, simple process, cheap. 4, outdoor, heavy the bimetallic thermometer is a kind of field detection instrument suitable for measurement of low temperature, can be directly used to measure the temperature of the liquid and gas. The main technical parameters: ( 1) Precision level: 1. Level 5 ( 2) Time constant: J< 40年代( 3) Protecting tube pressure: 6. 3 mpa5 type, electric contact bimetallic thermometer is a kind of field detection instrument suitable for measurement of low temperature, can be directly used to measure the temperature of the liquid and gas. （ 1) Precision level: 1. Level 5 ( 2) Time constant: J< 40年代( 3) Protecting tube pressure: 6. 3MPa（ 4) Contact capacity: 10 va rating ( Non-inductive) ； The highest voltage: ac 220 v, the maximum working current: 1 a ( Non-inductive) ，（ 5) Header working environment temperature: - 25 to 55 degrees Celsius 6, shock resistance, electric contact bimetallic thermometer filling seismic oil from inside the instrument, which can effectively overcome the mechanical vibration of pointer jitter.