Question About Co2 Regulator Please Help

the regulator only reads in psi and kpa is one of these the same as ppm or how do you get the ppm

No you measure the air co2 ppm with your ppm monitor or controller or the low tech co2 ppm syringe.The tank and regulator only set the pressure and flow rate at the bubble meter.The atual co2 ppm is measured with an air ppm meter or monitor to maintain set ppm levels.These run about $300-1200