Temperature meter and pressure gauge animation advantages and disadvantages are also speak here

Temperature instrument 1, solid expansion thermometer thermometer expansion thermometer temperature measurement is based on the principle of expansion of objects when heated expansion type can be divided into liquid and solid expansion type two kinds. Here introduces a solid expansion thermometer in this bimetallic thermometer bimetallic thermometer bimetallic thermometer is to put the two different expansion coefficient of metal sheet made of welded together, is a kind of solid expansion thermometer, simple structure, strong. Bimetallic thermometer temperature change can be converted to mechanical quantity changes, not only for measuring the temperature, but also used in temperature control device ( Especially the switch & other On and off throughout the &; Control) , use quite extensive. 1, thermocouple thermometer, thermocouple thermometer is has been widely applied in industrial production and temperature measuring device. Two kinds of different ingredients of conductor ( Called the thermocouple wire or hot electrode) Two ends synthesis loop, when the junction temperature is not at the same time, in the circuit will generate electromotive force, this kind of phenomenon called the thermoelectric effect, and the electromotive force called thermoelectric potential. Thermocouple is to use the principle of temperature measurement, which directly used for measuring the medium temperature is called at the end of the working side ( Also known as the measuring end) , on the other side called cold end ( Also known as compensation) ； The cold end connected to the display instrument or meter, display instrument will point out the thermocouple thermoelectric potential. Thermocouple sensor is composed of two different materials of metal wire, simple structure, convenient use, high precision, wide range, resistance to vibration, is suitable for high [area. Features: advantages: 1. High precision measurement. Because of thermocouple direct contact with the object being measured, not affected by intermediate medium. 2. Wide measuring range. The commonly used thermocouple from - 50 ~ + 1600 ℃ can be continuous measurement, some special thermocouple minimum measurable to - 271 - - + 2800 ℃ as gold iron nickel chromium and tungsten - Rhenium. 3. Simple structure, easy to use. Thermocouple is usually composed of two different kinds of metal wire, but is not limited by the size and the beginning of, outside has protective casing, which are very convenient. 4. Output signal linear good, easy to realize industrial production process automation. Disadvantages: less differential thermoelectric potential, and therefore have relatively low sensitivity; Price is more expensive, low mechanical strength, inappropriate in reducing atmosphere or a metal vapor under the conditions of use. 2, the principle of pressure type thermometer thermometer is based on the sealing temperature measuring system of liquid evaporation changes in the relationship between saturated vapor pressure and temperature, and temperature measurement. Bag when I feel the temperature change when temperature, saturated vapor produced the corresponding pressure in the closed system, cause the change of curvature elastic element, make its produce a shift in the free end, again by the displacement amplification mechanism of gear into the indicated value, the thermometer with a bulb small volume, fast response, high sensitivity and direct reading characteristics, almost set the glass rod thermometer, bimetallic thermometer, all the advantages of the gas pressure thermometer, it can be made into shock, anti-corrosion type, and can realize remote contact signals, heat resistance, 0 10 ma, or 4 20 ma signal. Is currently the most widely use scope, performance is one of the most comprehensive mechanical thermometer table. Features: with a small temperature measuring probe, high sensitivity, linear scale, long service life, etc. 1, bourdon tube type pressure gauge pressure gauge pressure gauges bourdon tube type pressure gauge working principle is: in the case with a with phosphorus copper into oval bourdon tube, one end of the tube fixed and connected to trap tube, the other end closed connected to the connecting rod and lever, pointer is fixed on the pinion shaft. When the compression of the spring tube, by oval expansion for the circular, spread outward force of spring tube, the higher the pressure, stretching, the greater the this action by rod, leverage, sector gear and small gear is passed to the pointer, pointer rotation indicates that the pressure inside the container. When there is no pressure in the container, spring tube is repaired, pointer back to zero. Scale pointer instructions for the table, the unit shall be the MPa. Features: bourdon tube type pressure gauge has a simple structure, low cost, high precision, easy to carry, convenient installation, wide pressure etc, so the application is very wide. It is by the atlas, spring tube, fixed end, tie rod, fan gear and small gear, pointer, balance spring, pipe joints and other parts. 2, electric point pressure meter spring tube of electric contact pressure gauge measurement system based on the measured medium pressure, the force of the spring tube ends a displacement of the corresponding elastic deformation, with the aid of tie rod and to amplify the transmission gear transmission mechanism, by the direction on the fixed gear ( Along with the contact) By the measured value on the dial indicator. At the same time, when its contact and setting a pointer ( The upper or lower limit) Contact ( Move off or close) Instantaneous, led to the disconnection or connection of control circuit in the system, in order to achieve the goal of automatic control and transmitting alarm.

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