I just drained all the Air to change to a C.F. cylinder. The electronic pressure stopped at 33 bar with all the air removed. Is this normal? Since it reads 33 bar at zero pressure will it be incorrect at high pressures?
The sensor that reads the bottle pressure on my Red Wolf has an operating range of 50-250 bar, So the reason your Airwolf only goes down to 33bar is likely due to it not being able to measure such low pressures (out of the operating range of the pressure sensor)