Soy Milk Concentration Measurement
Soy products such as tofu and dried bean-curd stick are mostly formed by coagulating soy milk, and the concentration of soy milk directly affects product quality. The production line for soy products typically includes a soybean grinder, mixing tank of raw slurry, cooking pot, screening machine, insulated tank, residue mixing tank, and supply system of residue and water. Soy product factories adopt two crafts raw slurry and cooked slurry to produce soy milk in general. The soy milk enters the insulated tank after slurry and residue separation, while the soybean residue undergoes two washes and is then separated by a centrifuge. The first wash water is reused in the coarse residue dilution process, and the second wash water is reused as grinding water in the soybean grinding process.
The Importance of Soy Milk Concentration
Soy milk is a colloidal solution containing soybean protein. Requirements on soymilk concentration vary in coagulation, and the amount of coagulant added must also be proportional to the protein content in the soy milk. Therefore, soy milk concentration determination is crucial in soy product production. The target soy milk concentration is determined by the craft requirements involving specific soy products. The stability of soy milk concentration is vital in the continuous production of soy products. If the soy milk concentration fluctuates significantly or frequently, it not only affects subsequent operations (especially automated coagulation systems) but also leads to inconsistent product quality, thereby impacting the overall product quality.
Soy Milk Concentration Requirements for Different Soy Products
Southern Tofu requires a slightly higher soy milk concentration as taking gypsum as a coagulant. In general, 1 kg of raw soybeans could produce 6-7 kg of soy milk, with a coagulation temperature within 75-85°C.
Northern Tofu requires a slightly lower soy milk concentration for taking brine as a coagulant. In general, 1 kg of raw soybeans produces 9-10 kg of soy milk, with a coagulation temperature within 70-80 °C.
GDL Tofu requires a higher soy milk concentration than both Southern and Northern tofu, taking glucono delta-lactone (GDL) as a coagulant. Generally, 1 kg of raw soybeans produces 5 kg of soy milk.
Dried bean-curd stick: When the soy milk concentration is approximately 5.5%, the quality and yield of dried bean-curd stick are optimal. If the solid content in the soy milk exceeds 6%, the rapid formation of the colloid reduces the yield.
Application of Online Density Meters in Soy Milk Concentration Determination
Maintaining the stability of soy milk concentration is a prerequisite for standardized processes, continuous production, and operational standardization, as well as a cornerstone of consistent product quality. Inline slurry density meter is an excellent method for measuring the soluble content in slurries. The Lonnmeter pulp density meter is a fully automated concentration measurement instrument that can be installed on pipelines or tank of various diameters for real-time soy milk concentration monitoring and control. It directly displays percentage concentration or user-defined units, offering faster, more accurate, and clearer measurements compared to handheld refractometers or hydrometers. It also features automatic temperature compensation. Soy milk concentration data can be displayed on-site and transmitted via analog signals (4-20mA) or communication signals (RS485) to PLC/DCS/frequency converters for monitoring and control. This technology revolutionizes the traditional manual measurement, recording, and control methods in the soy product industry, which have long relied on extensive production management.
Product Features
Factory Calibration and Automatic Temperature Compensation: Ready for immediate use without on-site calibration.
Online Continuous Determination: Eliminates the need for frequent manual sampling, saving labor and costs.
Standard Analog Concentration Signal Output: Facilitates integration into control systems, eliminating manual detection errors and ensuring concentration consistency.
Key Technical Parameters
Signal Mode:Four wire
Signal Output:4~20 mA
Power Source:24VDC
Density Range:0~2g/ml
Accuracy of Density:0~2g/ml
Resolution:0.001
Repeatability:0.001
Explosive-Proof Grade:ExdIIBT6
Operation Pressure:<1 Mpa
Temperature of Fluids:- 10 ~ 120 ℃
Ambient Temperature:-40 ~ 85 ℃
Viscosity of Medium:<2000cP
Electrical Interface:M20X1.5
By using online density meters, soy product manufacturers can achieve real-time monitoring and automatic adjustment of soy milk concentration, ensuring stable and consistent product quality while improving production efficiency and economic benefits.
Post time: Feb-08-2025
