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Industry Information
How to choose a good pressure transmitter (1)
2011-10-9 14:48:47

 

要测量 怎样 的压力: 先要确认系统中测量压力的最大值,一般而言,需要选择一个具有比 测量的 最大值还要大1.5 倍左右的压力量程的变送器。 1. What kind of pressure does the transmitter need to measure ? First, you need to confirm the maximum value of the measured pressure in the system. Generally speaking, you need to choose a transmitter with a pressure range that is about 1.5 times larger than the measured maximum value . . 因为 在许多系统中,尤其是 水压测量和加工处理中,有 最高值 值和持续不规则的上下波动, 但是 这种瞬间的 最高 值能 破坏压力传感器,持续的高压力值或 稍微超出变送器标定 最大值会缩短传感器的寿命, 同时 精度 也会 下降。 This is because in many systems, especially in water pressure measurement and processing, there are the highest value and continuous irregular up and down fluctuations, but this instantaneous highest value can destroy the pressure sensor, continuous high pressure value or If you slightly exceed the maximum value of the transmitter calibration , the sensor life will be shortened, and the accuracy will be reduced. 这样会降低传感器的响应速度。 A buffer can be used to reduce the pressure, but this will reduce the response speed of the sensor. 一定 要充分考虑压力范围,精度 和它的 稳定性。 Therefore, when selecting a transmitter , we must fully consider the pressure range, accuracy and its stability.

怎样 样的压力介质:我们要考虑的 压力变送器 所测量的介质 是怎样的 , 黏性液体、泥浆会 不会 压力接口, 溶剂或 有腐蚀性的物质会不会破坏变送 与这些介质直接接触的材料。 2. What kind of pressure medium: We have to consider what kind of medium is measured by the pressure transmitter . Will viscous liquid or mud block the pressure interface, and will the solvent or corrosive substance Destroy the material of the transmitter in direct contact with these media. 不是 选择直接的隔离膜 及直接与介质接触的材料。 These factors will determine whether to choose a direct insulation film and materials directly in contact with the medium. 所测 的介质对316 不锈钢没有腐蚀性 , 那么基本上所有的压力变送器都适合对介质压力的测量 . 如果 所测 的介质对316 不锈钢有腐蚀性,那么就 要采用化学密封 , 这样不 可以测量介质的压力, 可以有效的阻止介质与压力变送器的接液部分的接触, 从而起到保护压力变送器 , 延长了压力变送器的寿命 Generally, the material of the contact medium part of the pressure transmitter is 316 stainless steel . If the measured medium is not corrosive to 316 stainless steel , then basically all pressure transmitters are suitable for measuring the pressure of the medium . The medium is corrosive to 316 stainless steel, so it is necessary to use a chemical seal.This not only can measure the pressure of the medium , but also effectively prevent the medium from contacting the wetted part of the pressure transmitter , thereby protecting the pressure change. Transmitter to extend the life of the pressure transmitter .

影响 精度的 因素 非线性 迟滞性 机电商务网非重复性 温度 零点偏置刻度 等, 主要 还是 由非线性,迟滞性,非重复性 比较明显 ,精度越高,价格也就越高。 3. Accuracy required by the transmitter : The factors affecting accuracy are : non-linearity ; hysteresis ; non-repetitiveness of electromechanical business network ; temperature ; zero offset scale, etc., but mainly due to non-linearity, hysteresis, non-repetition Obviously , the higher the accuracy, the higher the price. 或多或少 都会有精度误差的, 但是由于 每个 国家所标的精度等级 不相同 , 比如 , 中国和美国等国家标的精度是传感器在线性度最好的部分 , 也就是我们通常所说的测量范围的 10% 90% 之间的精度 而欧洲标的精度则是线性度最不好的部分, 也就是我们通常所说的测量反的 0 10% 以及 90% 100% 之间的精度 Every electronic meter has more or less accuracy errors , but because the accuracy level of each country is different , for example , the national standard accuracy of China and the United States is the part with the best linearity of the sensor. It is what we usually call the accuracy between 10% and 90% of the measurement range ; and the European standard accuracy is the worst part of linearity , which is what we usually call the inverse measurement of 0 to 10% and 90% To 100% accuracy . 欧洲标的精度为0.1%, 但是 在中国标的精度 就为0.5% That is, the accuracy of the European standard is 0.1%, but the accuracy of the Chinese standard is 0.5% .

通常 的情况下, 一个变送器会标定两个温度范围, 也就是 正常操作的温度范围和温度可补偿的范围。 4. Temperature range of the transmitter : Under normal circumstances, one transmitter will calibrate two temperature ranges, that is , the temperature range for normal operation and the temperature compensation range. 正常 工作状态的时候的温度范围,在超出温度 正常 范围 ,可能会达不到 应用的性能指标。 The normal operating temperature range refers to the temperature range of the transmitter when it is in normal working state. When the temperature exceeds the normal range of the temperature , it may not meet the performance indicators of its application. The temperature compensation range is a typical range smaller than the operating temperature range. 应有的性能指标。 Working in this range, the transmitter will certainly reach its due performance indicators. 它的 输出 一是零点漂移 二是影响满量程输出。 It affects its output in two ways : one is zero drift ; the other is its full-scale output. 如:满量程的/-X%/ ,读数的 /-X%/ ,在超出温度范围时满量程的 /-X% ,在温度补偿范围内时读数的 /-X% ,如果没有这些参数,会 导致 在使用中的不确定性。 For example : / -X% / ℃ of full scale, / -X% / of reading, / -X% of full scale when the temperature range is exceeded, / -X% of reading when the temperature is within the compensation range These parameters will cause uncertainty in use.