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For pressure transmitter selection should pay attention to several issues
2014-02-28 Reads : 32
We must first understand how much pressure transducer to measure pressure: first determine the system to confirm the maximum measuring pressure, in general, need to select one with a bigger than 1.5 times the maximum pressure range pressure transmitter . This is mainly in many systems, especially in the pressure measurement and processing, with the peak and sustained irregular fluctuations, the instantaneous peak value can damage the pressure sensor, or sustained high pressure slightly exceeding the pressure transmitter will shorten the life of the maximum calibration of the sensor, however, because this would decrease the accuracy. So, you can use a buffer to reduce the pressure spikes, but this will reduce the speed of response of the sensor. So when selecting pressure transducer, pressure to fully consider the range, accuracy and its stability. What followed measure the pressure medium is: Do we have to consider is the measured media pressure transmitter, viscous liquids, slurries will be blocked pressure port, solvents or corrosive substances will not damage the transmitter Lu with these media direct contact with the material. These factors will determine whether to select the direct isolation material film in direct contact with the medium. Wetted parts materials are generally used in the pressure transmitter is 316 stainless steel, if your media is not corrosive to 316 stainless steel, so basically all of the pressure transmitters are suitable for the measurement of media pressure you if you 316 stainless steel for corrosive media, then we will employ chemical seal, it will not only serve to measure the pressure of the media, but also can effectively prevent the medium wetted parts in contact with the pressure transmitter, thus helping protect the pressure becomes transmitter, extending the life of the three pressure transmitters, pressure transmitters require much accuracy: Accuracy has decided, nonlinearity, hysteresis, non-repeatability electromechanical Business Network, temperature, zero offset scale temperature affected. But mainly by the non-linearity, hysteresis, non-repeatability, accuracy is higher, the higher the price. Each meter will have an electronic style precision error, but because of the subject of each country is not the same level of precision, such as China and the United States is the best part of the subject of precision sensors online degrees, which is what we usually said the accuracy of 10% to 90% of the measuring range between; while Europe is the subject of precision linearity worst part is, we usually refer to the measurement of 0-10% trans and 90% to 100% of the accuracy between the accuracy of the subject, such as 1% in Europe, the accuracy of the subject in China is 0.5% four pressure transmitters temperature range: Typically a pressure transmitter will be calibrated two temperature ranges, i.e., the normal operating temperature range and temperature range can be compensated. Normal operating temperature range is the pressure transmitter in working condition will not be damaged when the temperature range up when the temperature exceeds the range of performance indicators may be less than its applications. Temperature compensation range is smaller than the operating temperature range of a typical range. Within this range, the pressure transmitter will certainly reach its proper performance. Temperature change affects its output in two ways, one is zero drift; second is the impact of full scale output. Such as: full scale + /-X% / ℃, reading + /-X% / ℃, when the temperature exceeds the range of full scale + /-X%, while in the compensated temperature range of reading + /-X% If none of these parameters will lead to uncertainty in use. Changes in the degree of pressure transmitter output to changes caused by stress or caused by temperature changes. Temperature effect is to understand how to use the most complicated part of the pressure transducer. Fifth, the output signal of what needs to be: mV, V, mA output and digital output frequency, the output depends on how to select a variety of factors including the distance between the pressure transmitter and the system controller or the monitor room, the existence of "noise" or other electronic interference signals. The need for amplifiers, the amplifier location. For a lot of pressure transmitters and controllers between shorter distance OEM equipment, pressure transmitter mA output is the most economical and effective solution if you need to amplify the output signal, preferably a pressure transmitter with built-in amplification devices. For long-distance transmission of electronic interference, or there is a strong signal, preferably mA level output or frequency output. If the index is high RFI or EMI environments, in addition to note that you want to select mA or frequency output, but also take into account the special protection or filter. (Currently due to various acquisition needs, and now the output signal of the pressure transmitter on the market there are many, there are 4 ... 20mA, 0 ... 20mA, 0 ... 10V, 0 ... 5V, etc. , but more common is 4 ... 20mA and 0 ... 10V two kinds, these output signals I cited above, only 4 ... 20mA two-wire system, we are talking about a few wire output grounded or shielded cable is not included, others are three-wire) six, choose what kind of excitation voltage: select the type of output signal determines how kind of excitation voltage. Many amplified pressure transmitter has a built-in voltage regulator device, so its large supply voltage range. Some pressure transmitter is a quantitative configuration, you need a stable operating voltage, it is possible to get a job to decide whether the use of sensors with voltage regulator, and comprehensive consideration of the operating voltage and system cost when selecting transmitter. Seven, if need to have interchangeable pressure transmitter: determining whether the required pressure transmitter can accommodate multiple use systems. In general, it is very important. Especially for OEM products. Once the product to the customer, then the customer is used to calibrate the spending is quite large. If the product has a good compatibility, then even varying the pressure transmitter, it will not affect the effect of the whole system. Eight, the need to keep the pressure transmitter overtime stability: After most of the pressure transmitter in overtime will have a "drift" and therefore it is necessary to know before buying pressure transmitter stability, this pre- future work to reduce the use of all sorts of trouble arise. Pressure transmitter package: pressure transmitter package, in particular its often easy to overlook the rack, but use it in the future will gradually expose their shortcomings. In the optional conveyor transfer must take into account the pressure transmitter future work environment, how humidity, how to install pressure transmitter, will have a strong impact or vibration. Nine, between the pressure transmitter and other electronic equipment using what connection: the need for the use of short-range connections? If the use of long-distance connections, whether using a connector? Other: We identified some of the above parameters even after the confirmation process pressure transmitter connected to your interface and power supply voltage of the pressure transmitter; If used in special occasions and also consider the explosion protection class. This article comes from Huai'an Dwyer instrumentation transmitter technical information, address: http://www.chinadwr.com/ welcome more friends to participate pointing met to discuss the issue.
keywords: Pressure transmitter, smart pressure transmitter, differential pressure transmitter,
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You are the 10689 visitor
Copyright © GuangDong ICP No. 10089450, The Huai'an Dwyer Instrument Co., Ltd. All rights reserved.
Technical support: ShenZhen AllWays Technology Development Co., Ltd.
AllSources Network's Disclaimer: The legitimacy of the enterprise information does not undertake any guarantee responsibility