|信息来源： 液位变送器 | 2020-06-11 点击量： 1798|
3151 flange type liquid level transmitter integrates the structural advantages of two most popular and widely used transmitters (Rosemount 3051 series transmitter and Yokogawa eja-e series transmitter) in appearance, which makes many users feel fresh and refreshing. At the same time, it can be directly replaced with traditional series products in installation, with strong versatility and substitution ability.
In flange type liquid level transmitter_ What are the advantages and disadvantages of current output type and voltage output type? / it is suitable for measuring the flow, liquid level, density and pressure of high and low temperature, high vacuum, high viscosity and easily crystallized medium. It can be converted into 4 ~ 20mA DC current signal output, which has the functions of fast response, remote setting and self diagnosis. Eja118w diaphragm seal differential pressure transmitter, eja118n diaphragm seal differential pressure transmitter and eja118y diaphragm seal differential pressure transmitter. The upgraded model is eja118e diaphragm seal intelligent differential pressure transmitter
In flange type liquid level transmitter_ What are the advantages and disadvantages of current output type and voltage output type? / in many applications controlled by single-chip microcomputer, transmitters are used to convert the signals that can not be directly measured by single-chip microcomputer into electrical simulation signals that can be processed by single-chip microcomputer, such as current transmitters, pressure transmitters, temperature transmitters, flow transmitters, etc.
Most of the early transmitters are voltage output type, that is, the measurement signal is converted to 0-5V voltage output, which is the direct output of the op amp, the signal power is less than 0.05W, and the digital signal is converted through the simulation / digital conversion circuit for the MCU to read and control. However, when the signal needs long-distance transmission or the power grid interference is large in the use environment, the use of voltage output type sensor is greatly limited, which exposes the shortcomings of poor anti-interference ability, line loss and accuracy, etc., while the two-wire current output type transmitter has been widely used for its high anti-interference ability.
In flange type liquid level transmitter_ What are the advantages and disadvantages of the current output type and the voltage output type? / the anti-interference ability of the voltage output type transmitter is very poor, and the line loss is damaged, which can not be said to have high precision, Sometimes the output DC voltage is also superposed with AC component, which causes the single chip computer to make a wrong judgment and control, and even damages the equipment when it is serious. The output 0-5V can never be transmitted far. After the remote transmission, the line voltage drop is large and the accuracy is greatly reduced. Now many input signal ports of ADC, PLC and DCS are made into two-wire current output transmitter 4-20mA, which proves the inevitable trend of voltage output transmitter being eliminated.
In flange type liquid level transmitter_ What are the advantages and disadvantages of current output type and voltage output type? / what are the six comprehensive protection functions of two-wire current transmitter
(1) . input overload protection;
(2) . output overcurrent limit protection;
(3) . long time short circuit protection of output current;
(4) , two wire port transient induced lightning and surge current TVs suppression protection;
(5) Over voltage limit protection of working power supply ≤ 35V;
(6) . reverse connection protection of working power supply.
Relying on the advantages of professional technology, reliable and stable product quality, Huaheng instrument manufacturer insists on meeting the needs of users to a large extent, which is the power source of enterprise development. With high-quality professional services, it provides industrial automation instrument products with high performance price ratio for China's electric power, petroleum, chemical industry, metallurgy, cement, mining, municipal administration, papermaking and other industries. It has made an important contribution to the development of automatic instruments in China.