What type of level gauge is suitable for a hydrochloric acid tank?
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The level gauge for the hydrochloric acid tank in my workshop is a glass tube type, which poses a safety risk of rupture. Would it be suitable to replace it with an anti-corrosion magnetic flap level gauge? What are the advantages and disadvantages? Are caustic soda tanks and sulfuric acid tanks also suitable?
Choosing a magnetic flip switch is feasible. The structure of the magnetic flap level gauge relies on the principle of a bypass tube, ensuring that the liquid level in the main tube is identical to that in the container. Based on Archimedes’ principle, the buoyant force generated by the magnetic float in the liquid balances its weight, allowing the float to remain on the surface of the liquid. As the liquid level in the container changes, the float in the main tube of the level gauge moves up or down accordingly. The permanent magnet inside the float drives the flap indicator within the gauge through magnetic coupling; when the liquid level rises or falls, the color of the flap indicator changes from white to red, or from red to white. The degree of color change in the indicator corresponds to the actual liquid level of the medium being measured, thereby enabling on-site indication of the liquid level. Flip-board level gauges are suitable for use in various large-scale towers, tanks, boilers, and other high-temperature and high-pressure sealed containers. Safe, reliable, durable, intuitive, and with a wide measurement range. Combined with a magnetic switch, it enables upper and lower limit alarms and control for liquid level or interface level ； When equipped with a level transmitter, the level signal can be converted into a continuous output signal of 40–20 mA, enabling remote detection, indication, recording, and control.
Hydrochloric acid is highly corrosive; how can the magnetic material used in magnetic flap valves address this corrosion issue? If you are concerned about glass tubes breaking easily, you may consider using fully transparent polytetrafluoroethylene level gauges, which offer similar performance to glass tubes; they do not break and do not cause corrosion. Such PTFE level gauges are widely used in the level measurement of hydrochloric acid storage tanks at large chlor-alkali plants in our area, and their performance has been satisfactory.
An immersion level gauge of the E+H type can be used, as well as ones with special diaphragms. However, it is necessary to consult a table of metal corrosion rates, taking into account temperature and concentration