I am looking for an alternative way to purge hydrogen (in order to obtain certain desired products in an anaerobic process). Hence, to my knowledge, mass flow controllers are regularly used for H2 injections. However, I also wanted to know if there is any other alternative way to purge hydrogen gas into an anaerobic bioreactor at any flow rate (different flow rates in case of different MFCs)? If yes, then please do let me know about some additional information about this and also about MFCs.
mass flowmeters just measure gas flow in terms of mass e.g. in (kilo)gram/hour.
We use these flowmeters at industrial scale to measure the biogas production of our plants and send the signal to a PLC - SCADA system.
Flow and other meters can provide a standard analog output signal which is typically a loop current of 4 - 20 mA resulting in a voltage of 1 - 5 V across a precision resistor of 5000 Ohm.
A digital output can be standard 8-bit coded ASCII data send over RS232C or RS485 communication lines at a certain bit rate (baud) or other protocols such as the 2-way HART industrial standard which is superimposed on the standard 4-20 mA analog signal.
There are several types of MFC, based on distinct operating principles. For the specific case of a Mass Flow Controller (MFC) operating by sensing the temperature change along the heated section of a capillary tube; its output signal (V) could be given as: V = K·Cp·Qm = K·Cp·ρ·Qv, where K is a constant (independent of the gas), Cp stands for the gas specific heat, ρ for its density, Qv for volumetric flow (all that for normal conditions); while Qm is the mass flow.
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