On measuring liquid level using the blowing method.
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A beginner in instrumentation is seeking help; I read in a book that the prerequisite for using the blowing method to measure liquid level is the presence of tiny bubbles emerging from the lower end of the tube. But how can I tell if there are bubbles coming out? What is the actual state of these tiny bubbles? A beginner when it comes to instruments.
It’s like water that is half-boiled – bubbles rise from near the surface of the liquid in the conduit, provided that the flow rate of the liquid at the surface near the conduit isn’t too fast
There are float flow meters after all; once there is a flow rate for the purified air, it will keep flowing continuously. The specification sheet must specify a required flow rate, which is generally between 20-50 L/h
A float flow meter must be installed on-site for the bubble level gauge, and the reading is determined based on that float flow meter. The advantage of using a bubble level gauge is that it can be used as a nitrogen seal if the gas source is nitrogen. The downside is that if the viscosity of the material is too high, the measurement will be inaccurate
These days, pneumatic level gauges are rarely used; remember that the standard for bubbles is the number per minute, and you need to check the instrument’s manual for this information.
I tried it with flow rates of 30L, 50L, 100L, and 200L – it had almost no effect on the measurements