On the output of pressure sensors and the conversion of analog and digital quantities
Generally, the output current is more, we are using a constant voltage input, then the sensor is a variable resistance, pressure resistance increases, if the pressure is 0 when the output is 4mA, the pressure to the maximum tolerable range of 20mA, which is a linear relationship, according to the current configuration of the pressure data on it! Is actually very simple, if the output voltage, so it is certainly a constant current input, according to the resistance change distribution voltage is a linear relationship, you want to use this sensor data you can add parameters can not you?This is the oil level sensor I used
Pressure sensors are commonly used: 4-20mA, 0-20mA, -20--20mA, 0-10V, -10--10V, 0-5V, 1-5V, 2-10V, 0-100mV and so on, of course, there are some 485 senior HART protocol to transmit the pressure sensor, pressure sensor connection cable is also usefulSpecific conversion see sensor nameplate range, corresponding up on the lineIt's complicated to use PLC to display on the computer1. PLC in the pressure value of standardization, calculate the corresponding pressure, such as 3.4MPa2. connect the PLC to the computer via the communication line3. through special software graphical display in the computer, but also storage, printing, analysis and so on
1. pressure sensors have 0-5V, 4-20MA, 0-20MA, -10-10V, see you need that kind of signal, high-speed supplier, he will give you good.2., voltage and current, this is a linear relationship, for example, you pressure range is 0MP-10MP, corresponding to 4-20MA, so that you do not come to a function?3. Digital to analog, one can use, and this instruction, the software has written, you just mark it up on the OK, displayed on the computer is ok.30 I haven't used it. I've used OMRON. It's SIEMENS's.
