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technical article
Differential pressure principle of capacitive transmitter
2011-10-17 16:01:34

Capacitive transmitters are widely used in industrial industries, such as a large number of applications in chemical, petroleum and other industries, as well as supporting the use of other products.

主要是通过 两种压力通入 高、低压力室 进行测试 主要是对 两侧隔离膜片( 也就是 敏感元件) δ 元件上的作用, 元件内 填充液通过隔离片传送到测量膜片两侧的介质 测试,再 由测量膜片与两侧绝缘片上的电极各组成一个电容器 进行对 MT3351 系列差压变送器 的测试 Capacitive differential pressure transmitters are mainly tested by passing two kinds of pressure into the high and low pressure chambers . The main purpose is to effect the isolation diaphragm ( that is, the sensitive element ) on both sides on the delta element and fill the element The liquid is transmitted to the dielectric test on both sides of the measuring diaphragm through the separator , and then a capacitor is formed by the measuring diaphragm and the electrodes on both sides of the insulating diaphragm to test the MT3351 series differential pressure transmitter . 两侧压力不一致 就会导致 测量膜片产生位移 现象 这时候它的 位移量和压力差成正比, 所以导致 两侧电容量就不 再相 等,转换成与压力成正比的信号, 主要是 通过振荡和解调环节。 When the pressure on the two sides is inconsistent , it will cause the displacement of the measuring diaphragm . At this time, the displacement is proportional to the pressure difference, so the capacitance on the two sides is no longer equal . The proportional signal is mainly through the oscillation and demodulation links. 用来判定输入 压力值 ,主要是根据 A/D 转换器将解调器的电流转换成数字信号 The microprocessor is used to determine the input pressure value , and the current of the demodulator is converted into a digital signal according to the A / D converter .

主要在 微处理器 电容式变送器 A/D 转换器将解调器的电流转换成数字信号,电容式压力变送器和电容式绝对压力变送器的工作原理和差压变送器 大致是 相同,所不同的是低压室压力 大气压 或者 真空。 The value that controls the work of the transmitter is mainly in the microprocessor , the A / D converter of the capacitive transmitter converts the current of the demodulator into a digital signal, the capacitive pressure transmitter and the capacitive absolute pressure transmitter The working principle and differential pressure transmitter are roughly the same, except that the pressure in the low-pressure chamber is atmospheric pressure or vacuum. 值被微处理器用来判定输入 压力值 Its measured value is used by the microprocessor to determine the input pressure value . 就是对 传感器线性化 进行 测量范围 重置 工程换算单位、开方,阻尼、传感器微调等 一系列的 运算,以及数字通信和诊断。 In addition, it is a series of calculations such as linearization of the sensor , reset of the measurement range , engineering conversion units, square root, damping, sensor trimming , and digital communication and diagnosis.

微处理器中 有三个16 位计数器,其中 的一个计数器是用来 执行 A /D 转换 且同时装 16 字节程序的 RAM The microprocessor of the capacitive transmitter is equipped with three 16 -bit counters, one of which is used to perform A / D conversion , and at the same time is equipped with a 16- byte program RAM . 得的 并经 校正 数字信号 会被 D/A 转换器微调数据,这些数据 都是经过 软件 处理并 修改 变送器 The digital signal obtained by the microprocessor and corrected will be fine-tuned by the D / A converter. These data are processed by the software and modified to the transmitter . 数据 贮存在EEPROM 内, 即使在 断电 情况下 会被 保存完整。 These data are stored in the EEPROM and will be kept intact even in the event of a power failure .