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In the quality control aspects of acid, base, and salt production, ultrasonic density meters and fork-type density meters are not inherently superior or inferior to one another; rather, it is necessary to choose the appropriate type based on the specific properties of the process medium involved. When dealing with mother liquors of acids, bases, and salts that are prone to crystallization, have high viscosity, or contain bubbles, an ultrasonic density meter is the undisputed best choice ； When dealing with highly corrosive yet clean, crystal-free acidic or alkaline liquids, the fork-type density meter becomes the preferred choice due to its high cost-effectiveness and excellent corrosion resistance. 1. For handling conditions characterized by easy crystallization and scaling (such as sodium chloride mother liquor, concentrated sulfuric acid, etc.), an ultrasonic density meter is the preferred choice: this is its core area of strength. Whether it uses an external clamping installation that remains completely in contact-free with the medium, or relies on acoustic impedance algorithms to penetrate the thin crystalline layer on the surface of the probe, it can \"ignore\" any deposits present and continue to provide stable and accurate density readings, thus achieving virtually maintenance-free operation. Tuning fork densitometer: extremely fragile. The measurement principle of a tuning fork relies on the vibration frequency of its prongs; once crystals or scale accumulate on the surface of these prongs, it increases their mass, which results in continuously high readings. Under conditions prone to crystallization, it requires frequent shutdowns for disassembly and cleaning, which severely affects production continuity. 2. Fork-type density meters for dealing with “highly corrosive” clean media (such as hydrochloric acid, caustic soda, etc.): Fork-type density meters perform excellently in clean, highly corrosive liquids. It boasts excellent customization capabilities; the fork body can be made from various high-quality corrosion-resistant materials such as Hastelloy and titanium, enabling it to resist corrosion from various acids and bases over the long term. It also has a simple structure and low initial procurement costs. Ultrasonic density meters: they are also suitable for this purpose, but when dealing with clean, disturbance-free corrosive liquids, their advanced features such as resistance to crystallization and bubbles are somewhat redundant; moreover, their initial investment cost is higher than that of fork-type density meters. 3. Ultrasonic density meter for handling conditions with bubbles or concentration stratification (superior): It uses volume-averaged measurement; sound waves penetrate the entire cross-section of the pipe, allowing the data to reflect the true overall concentration of the medium. At the same time, advanced algorithms can effectively identify and filter out bubble interference, producing a smooth signal, which is highly suitable for PID closed-loop automatic control. Tuning fork densitometer: It performs single-point measurement; if there are concentration gradients of acids or bases within the pipeline, the data obtained is not representative. Furthermore, it is extremely sensitive to bubbles; their passage can cause the reading to drop sharply, resulting in false fluctuations that can easily mislead the control system. Summary recommendation: If your acid, base, and salt production process involves mother liquor evaporation, salts that crystallize easily, or reaction processes that generate bubbles, choose an ultrasonic density meter. It is an ideal solution to address the pain points of \"uncertainty in measurement\" and \"difficulty in maintenance\".