ETP90H-4G50 ABB

ETP90H-4G50数字变送器,即把模拟量变换成数字量显示,并按一定的比例输出电流信号或电压信号,国内的标准统一传输信号的模拟二线制是4-20mA,0-20mA,4-24mA.

ETP90H-4G50变送器的分类方法很多，按工作能源分，有气动变送器、液动变送器、电动变送器；按被测参数分，有差压变送器、压力变送器、流量变送器、温度变送器、液位变送器；按通信协议分，有HART变送器、DE变送器、FF变送器和PROFIBUS变送器；按工作原理分，有力平衡式变送器、振弦式变送器、电容式变送器、电感式变送器、压阻式（扩散硅式）变送器、硅谐振式变送器和压电式变送器；按信号类型分，有模拟变送器和数字变送器；按有无微处理器分，有常规变送器和智能变送器。 差压变送器 智能变送器有两种，一种是真正的智能变送器，即现场总线型的全数字式智能变送器；另一种是混合式智能变送器，它既有数字信号，又有模拟信号。

ETP90H-4G50市场上出现的和我国各工厂内使用的主要是混合式智能变送器。为了和习惯上的称呼统一，对混合式智能变送器，我们就直接称它为智能变送器，或称为HART变送器；而对真正的智能变送器，则称为全数字式智能变送器或现场总线变送器。

ETP90H-4G50 digital transmitter, that is, converts analog quantity into digital quantity for display, and outputs current signal or voltage signal according to a certain proportion. The domestic standard unified analog two-wire transmission system is 4-20ma, 0-20ma and 4-24ma.
There are many classification methods of ETP90H-4G50 transmitter, including pneumatic transmitter, hydraulic transmitter and electric transmitter according to working energy. According to the measured parameters, there are differential pressure transmitter, pressure transmitter, flow transmitter, temperature transmitter and liquid level transmitter. According to the communication protocol, there are HART transmitter, DE transmitter, FF transmitter and PROFIBUS transmitter; According to the working principle, there are powerful balance transmitter, vibrating wire transmitter, capacitive transmitter, inductive transmitter, piezoresistive (diffused silicon) transmitter, silicon resonant transmitter and piezoelectric transmitter. According to signal types, there are analog transmitters and digital transmitters; According to the microprocessor or not, there are conventional transmitters and intelligent transmitters. There are two kinds of intelligent transmitters for differential pressure transmitter, one is the real intelligent transmitter, that is, the all-digital intelligent transmitter of field bus type; The other is the hybrid intelligent transmitter, which has both digital and analog signals.
ETP90H-4G50 is a hybrid intelligent transmitter that appears in the market and is used in various factories in China. In order to be consistent with the customary name, we directly call the hybrid intelligent transmitter intelligent transmitter or HART transmitter. The real intelligent transmitter is called all-digital intelligent transmitter or field bus transmitter.