We have been using MFC to control the flow rate of pure ammonia gas. The MFC is placed in an oven at 50 deg. C to avoid blockage due to NH3. However, after a few days of usage, the MFC is unable to provide the set flow rate. To overcome we have opened and placed it in ambient conditions to remove NH3 in it. Although this process solved the problem at first but after few times this keeps happening everyday and further within a few minutes. How can we overcome this problem?
A mass flow controller automatically controls the flow rate of a gas according to a set flow rate sent as an electric signal, without being affected by use conditions or changes in gas pressure. Mass Flow Meter operating on the "Coriolis principle" contains a vibrating tube in which a fluid flow causes changes in frequency, phase shift or amplitude. The sensor signal is fed into the integrally mounted pc-board. The resulting output signal is strictly proportional to the real mass flow rate, whereas thermal mass flow meters are dependent of the physical properties of the fluid. The mass flow meter depends upon density ,the ammonia density varies with temperature. Please calibrate your MFC according to standard.
https://www.researchgate.net/profile/Prem-Baboo/publication/286937673_Principles_of_Mass_Flow_meters/links/56718bab08ae90f7843f2fa3/Principles-of-Mass-Flow-meters.pdf
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