venkates2218
Full Member level 6
Please refer the image.
In my factory an gas sensor MICROSAFE MC-100 is used to sense the gas in chamber.Their is an controller in the chamber which control the gas flow based on the value in the gas sensor.
The sensor is operating in 24V DC power.According to this circuit which I observed is the controller sensing the current taken by the sensor and controlling the gas flow.
Operation of Gas sensor:
When the flow of gas increase the milliamps current taken by the sensor also increasing.At 10 PPM it will take 20mA.
My doubt is i need to sense the milliamps current by thee PIC controller to control the gas flow to the chamber.
I searched on Google but I can't get any circuit to sense the milli amps current.I need the range from 1mA to 20mA.
Please provide the circuit or some other way.