Let’s take a look to see what type of level gauge it is
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My flow cell is equipped with two level gauges for measuring the liquid level in it. I’m not sure what type of level gauges they are; could someone please tell me how they work? As shown in the diagram
The last edit to this post was made by tiger2010 on 2020-2-20 at 21:48; the photos don’t show clearly how the entire pipeline is connected – it seems to be a blow-type level gauge
Instrument air passes through the pressure reducing valve and is blown onto the tube connected to the transmitter, with the transmitter’s tube extending into the flow cell
Then it can be confirmed that it is a pneumatic level gauge
This is a transmitter; it’s not clear what type of level gauge it is.
The image is incomplete; it can only be seen that it is an EJA transmitter
A purge-type level gauge, also known as a back-purge level gauge, is a type of static pressure level gauge. A purge tube is inserted to the lowest point of the liquid being measured (the zero level), and a certain amount of gas (nitrogen, air) is introduced into this tube; the pressure inside the tube equals the static pressure of the liquid column at the tube’s outlet. By using a differential pressure transmitter to measure the pressure at the upper end of the blowing pipe, the liquid level can be determined. Since the blow-out type level gauge moves the pressure sensing end to the top, it is convenient for use and maintenance, and is well suited for applications such as underground storage tanks and deep wells.
The gas flow rate must be set appropriately; otherwise, the liquid level measurement will be inaccurate or even unusable