30+ Years of Precision Instruments
relative to other types of instrument panels, temperature meter is a very simple instrument panel, instrument panel, common ningbo digital thermostat include bimetal field thermometer, thermal resistance thermometer, thermocouple thermometer, integrated thermal resistance (platinum thermal resistance) thermometer, etc. Because Zhejiang digital thermostat bimetal thermometer has low marking precision on the spot, and generally loses high attention; as a result, bimetallic thermometers usually Yuyao digital thermostat has no remote transmission function, so the waterproof grade is not as good as that of remote thermometers. often, water leakage in the laminated glass control panel makes the needle and transmission system poorly organized and linear, its practical application effect is less idealistic. If the temperature of the processing technology is about 650 ℃, platinum thermal resistance is usually used. If the temperature measuring point prevents the main control room, the integrated intelligent transmitter is more suitable. As platinum thermal resistance must be specially used for compensation cable, the longer the length, the higher the cost. For example, in power plants, part of industrial boilers are generally compact with the main control room, part of high temperature uses platinum thermal resistance, and chemical plant equipment regulations and main control room must have a certain fire prevention distance. Therefore, it is more suitable to use platinum thermal resistance temperature change for chemical plant equipment with high processing process temperature. Accurate measurement of the following thermal resistance of medium temperature is an economical and easy-to-use temperature meter, such as three-wire PT100. No matter which kind of thermometer is selected as much as possible, the protective wire sleeve is of independent core-pulling type, which is convenient for maintenance and replacement, and the temperature watch core should be earthquake-resistant, so as to improve the load with high water flow.
1.2 pressure instrument
again, take the temperature transmitter as an example to make a concise and detailed introduction. In fact, there is no big difference in precision between the temperature transmitters of domestic brands and imported brands. In terms of zero point reliability, the domestic temperature transmitter is still slightly inferior. Therefore, in workplaces with high levels of occupational stress, domestic temperature transmitters can be used. For example, the working pressure of carbonated beverages in industrial boilers is sometimes at least a few megapascals. Even if there is a deviation of several kilopascals, it is not easy to endanger the actual operation. However, if the pressure is low, taking the finished product tank farm as an example, usually some finished product tanks are internal floating roof tanks. The actual operating pressure is not easy to be very high, and even nitrogen must be filled for maintenance. Such places must adopt temperature transmitters with more reliable characteristics. Whether flange plate pulse damper type or bolt connection is adopted depends on the material characteristics of processing technology and load standard. For example, when there is corrosion load in acid, alkali and salt, it is more suitable to use flange plate anti-corrosion pulse damper type. In the ultra-high pressure load, it is more suitable to use bolt connection. In addition, it is also necessary to have the countermeasures of preventing cold and condensation in winter to prevent freezing crack barometer.
