An overview of the pressure transmitter selection need to follow the principles of 10

1, will depend on the type to measure pressure in accordance with the pressure of conventional types mainly include pressure, thermal stress and pressure. Gage pressure refers to the atmospheric pressure is less than or greater than the atmospheric pressure; Refers to the absolute pressure is zero absolute pressure as the benchmark, above absolute pressure; Differential pressure refers to the two kinds of pressure difference. 2, according to the measured medium according to the measured medium is different, can be divided into dry gas, gas and liquid, highly corrosive liquid, viscous liquid, such as high temperature gas and liquid. According to the correct selection of different media, which is beneficial to prolong the service life of the transmitter. 3, according to the need of precision grade pressure transmitter manufacturers technology based on hierarchy transmission error of measurement precision. The precision of different for different basic error limit ( Expressed as the percentage of the full range output) 。 In actual production application, referring to the control requirements of measurement error, in line with the basic principles of economic and practical, quantify the choice. 4, according to the system maximum overload the device's maximum overload should be less than the maximal peak value of overload protection in the transmitter, otherwise will affect the service life of the problem in the transmitter, serious may even damage the transmitter. In general, the safety of the pressure transmitter overload stress is a whole range of about 2 times. 5, according to the measured pressure range, usually 80% of the measuring range is based on the actual measuring pressure. Because the biggest pressure into consideration. Generally speaking, the maximum pressure range of products which should be reached system maximum stress value of 1. 5 times. Some hydraulic pressure peak or continuous pulse and process control device. Could reach the peak of 'maximum pressure' five times or even ten times. More than maximum rated pressure transmitter, will shorten the actual service life of the transmitter. Buffer can be used to reduce the peak in the system, so as to reduce the response speed of the sensor. Pressure transmitter is designed to handle more than 200 million cycles of maximum pressure, and won't degrade performance. Launch machine the choice, you can find the compromise between the system performance and life of transmitter. 6, according to the system operating temperature range measuring medium temperature should be in the transducer working temperature range, if use overtemperature, will produce large measuring error, affect the service life of the transmitter. Pressure transmitter manufacturers in the production process to the influence of the temperature measurement and compensation, to ensure that the measuring error caused by the temperature within the accuracy level requirements. Range. Under the condition of high temperature, high temperature and pressure transmitter may be considered or auxiliary cooling measures such as condenser pipe installation, the radiator. 7, according to the pressure interface in general, in the form of threaded connection ( M20X 1. 5) Often in the form of a standard interface. 8, medium the compatibility with contact materials in some measurement occasions, measuring corrosive medium. At this point, the need to compatible with measuring dielectric materials or special treatment, to ensure that the transmitter will not damage. 9, according to the power supply and the output signal generally consists of dc power supply, its products offers a variety of output signal selection, including 4 - 20ma. ,0 - 5 v。 ,1 - 5 v。 ,0 - 10ma. Dc, etc. , with 232 or 485 digital output. 10, according to the situation of field work environment and have other vibration and electromagnetic interference problems, such as selection of the need to provide relevant information, so as to take corresponding measures to deal with in a timely manner. So in the selection, other such as electrical connection in the way can also according to the specific situation to be taken into account.
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