Reasons for industry to choose 4-20ma rope displacement sensor
4-20ma rope displacement sensor used in industry instead of other numerical output? Because the current signal is not easily disturbed. Moreover, the internal resistance of the current source is infinite, and the wire resistance is connected in series in the loop without affecting the accuracy, and it can transmit hundreds of meters on ordinary twisted pair lines.
The reason why the lower limit is not set to 0mA is to be able to check the disconnection: it will not be lower than 4mA during normal operation. When the transmission line is disconnected due to a fault, the loop current will drop to 0. 2mA is often taken as the disconnection alarm value. Therefore, when the sensor is selected, it usually outputs a 4-20ma signal, so that the signal is not easily disturbed and safe and reliable. The two-wire 4-20ma output can save the cost of the sensor. These reasons make the sensor widely used in the industry. Wire system 4-20ma delivery.
To sum up, this is the reason why the industry chooses the 4-20ma rope displacement sensor. The output signal is output to the required host computer, PLC and other secondary instruments, single-chip microcomputer, etc. through the drive module independently developed by Precision Electronics. The pull-out wire head adopts a spiral type, which is easy to install. The spiral-type puller prevents the wire rope from breaking and deforming due to the rotation of the measured object during the user's use.
