The Ecoserial device is a digital economiser with differentialpressure gauge able to pilot until 204 valves by connecting itself to a pneumatic driving module RPB with only two threads.
Several factors effecting on BOD in the industrial waste water were studied by using the differential-pressure metering device of BOD, and the corresponding improving methods were put forward.
The differentialpressure fluctuation has a quite great influence upon the measure precision in measuring natural gas flow rate with the measuring device by use of standard orifice plate.