The application of current signal at the scene of the industry

Abstract: the application of current signal at the scene of the industrial information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Working principle of the 4 ~ 20 ma current loop in the industrial field, with an instrumentation amplifier to complete signal conditioning and long term transport, will produce the following question: *, as a result of the transmission signal is a voltage signal, transmission line will be affected by the interference of noise; Second, the distribution of the transmission line resistance. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a current signal in the industrial field application of the article details. Working principle of the 4 ~ 20 ma current loop in the industrial field, with an instrumentation amplifier to complete signal conditioning and long term transport, will produce the following question: *, as a result of the transmission signal is a voltage signal, transmission line will be affected by the interference of noise; Second, the distribution of resistance of the transmission line will produce voltage drop; Third, how to provide the working voltage of instrumentation amplifier at the scene is also a problem. In order to solve the above problems and avoid the effects of related noise, we use electricity to transmit signal, because the current is not sensitive to noise. 4 ~ 20 ma current loop is 4 ma said zero signal, with the full scale of the 20 ma said signal, and less than 4 ma above 20 ma signal used in all kinds of fault alarm. 4 ~ 20 ma current loop has two types: two wire and 3 wire system. When monitoring system need through long-term drive the scene of the drive devices such as valves, usually use three wire transducer, here XTR in monitoring system, by the system directly to the XTR power supply, power supply is two current transmission line outside of the third line. Two-wire system is XTR and sensors is located in the end, because of the power supply problem, usually the receiver using 4 ~ 20 ma current loop to the far side of XTR power supply, the size of the reflected signal by 4 ~ 20 ma. 4 ~ 20 ma typical applications of the products is sensing and measurement applications, as shown in figure 1. In industrial field, there are many kinds of sensors can be converted into 4 ~ 20 ma current signal, ti has some very convenient for RTD and bridge transmitter chip. As a result of the transmitter chip contains general function of the ti excitation circuit such as voltage, electric current excitation current, voltage regulator circuit, instrumentation amplifier and so on, so many of the sensor signals can be easily converted into 4 ~ 20 ma signal. Most application for bridge sensor is used to measure pressure. In an actual circuit, if the resistance of the wheatstone bridge each arm for 2 k, so no matter from the excitation voltage or the difference in the output end, its equivalent resistance is 2 k. When under no pressure, bridge is balanced, the output voltage of 0. When the pressure, because of the unbalanced bridge, will produce a differential voltage, voltage will reflect the size of the pressure difference. Full and tone is two main technical index of the pressure sensor, the real world using the sensor there are certain nonlinear, the output voltage will change with the change in temperature. The change of output voltage with the temperature is not linear, full and tonal have this nature. 4 ~ 20 ma sensor signal disposal solution 4 ~ 20 ma current loop consists of two parts in the structure of the transmitter and receiver, transmitter general, sensor terminal or module is located in the end, the receiver generally on the PLC and the computer side, it is generally in the controller. Two wire 4 ~ 20 ma circuit application, its working power supply and signal Shared a wire, working power supply is provided by the receiver. In order to avoid 50/60 hz power frequency interference, electric current is used to transmit signals. Two wire plan needs to consider the main problem: determine the number of receivers used, when there are multiple receivers, it will require working transmitter has a lower supply voltage. Another consideration in loop current is to reduce the pressure drop at the receiving end. Two wire design need to consider: ( 1) Ring the number of the receiver circuit: more receiver will require transmitter has lower working voltage; ( 2) Necessary working voltage transducer will have certain allowance; ( 3) Determine the sensor incentive method is a voltage or current. With two wire scheme of voltage regulation and reference circuit. Figure xtr115/116 is used in the precision of 4 ~ 20 ma signal converter, it contains 5 v voltage regulating circuit, can supply power to an external circuit. On a piece of precision reference voltage can be used for voltage bias or sensor incentive. Three-wire system 4 ~ 20 ma circuit in design is provided by the transmitter end work power, to avoid 50/60 hz power frequency interference, electric current is used to transmit signals. XTR regulator and the scene of the load sharing a pick up.

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