Product center


TRF Online Dissolution Concentration Meter

TRF type on-line solution concentration meter is a high-precision on-line instrument based on the principle of optical critical angle measurement. It is mainly used for the control and guarantee of product quality in the industrial production process. It can be used for quality control of raw materials and finished products. An integral part of a process control system. For example, monitoring the concentration of soluble solids in solution, controlling the mixing ratio between liquids, or the progress of chemical reactions, and so on. The use of online measurement tools for product quality control has been widely recognized and applied to more and more industrial production processes.

TRF type on-line solution concentration meter is composed of digital sensor and smart transmitter. Among them, the digital sensor adopts the standard MODBUS communication protocol. The entire set of instruments can be used independently to achieve online measurement, recording and simple control, or they can only use sensors to directly connect to industrial computers, PLCs and other master controllers to form user control systems. When designing TRF, it has fully considered the different instrument use environments on the industrial production line, and people's requirements for the reliability and stability of online measurement data. It can be well applied to papermaking, beverages, chemicals, leather, coal mines, pharmaceuticals, and other Online monitoring of industrial processes.

● Chemical Sulphuric Acid, Sodium Hydroxide, Oleum, Hydrochloric Acid, Sodium Carbonate, Surfactants, Phosphoric Acid, Urea (Urea), Glycol, DMF (dry, wet tanning), DMAC, boric acid, ammonia

纸浆和造纸黑液(Black Liquor)、白液(White Liquor)、聚乙烯醇(PVA)、绿液(Green Liquor)、淀粉(Starch)、树脂(Resin)、红液(Red Liquor)、涂层(Coatings)、妥尔油(Tall Oil) Black Liquor, White Liquor, Polyvinyl Alcohol (PVA), Green Liquor, Starch, Resin, Red Liquor, Coating Coatings, Tall Oil

食品工业蔗糖(Sucrose)、果浆和果冻(Jams & Jellies)、果糖(Fructose)、果汁(Fruit Juices)、番茄酱(Tomato Paste)、软饮料(Soft Drinks)、牛奶(Milk)、啤酒(Beer)、葡萄糖(Dextrose)、 NaCl Sucrose, Jams & Jellies, Fructose, Fruit Juices, Tomato Paste, Soft Drinks, Milk, Beer ), Dextrose, NaCl

其他典型应用切削液、冷却剂、洗涤剂、酒精、次氯酸钠(NaClO)等 Other typical applications Cutting fluid, coolant, detergent, alcohol, sodium hypochlorite (NaClO), etc.

Refractive index is an inherent property of a substance and changes according to temperature and wavelength. When two substances are mixed into a solution, there is a good correlation between their ratio (concentration) and refractive index. Therefore, when the temperature and wavelength are known, the concentration of the solution can be detected by detecting the refractive index. Refractive index based concentration detection is mainly for binary mixtures (liquids consist of only two components).

Of course, in practical applications, if the concentration change of a multi-component solution system (there are multiple components in the liquid) is only caused by the change of one of the components, it is also possible to accurately measure the refractive index. As shown in the figure below, the light from the LED passes through the surface of the prism to the working surface (the contact surface of the prism and the process fluid). The light reaching the working surface crosses the working surface at a series of angles, including the critical angle (Ic) with the fluid being measured. The light passing through the working surface at an angle smaller than the critical angle is refracted into the measurement fluid, and the light passing through the working surface at an angle larger than the critical angle is totally reflected and passes through the prism to reach the CCD linear array group. The critical angle is the light and dark area of the dividing line. The refractive index of the measured object can be obtained by analyzing the image detected by the CCD. After further processing, it can be converted into the concentration of the measured object. When the refractive index of the process fluid changes, the change in the critical angle will change the ratio of light / dark time and is detected by the CCD. The change in time interval is processed and enhanced and displayed in the form of refractive index, Brix, solids content, or other units of measurement.

● Completely independent intellectual property rights, has obtained a number of patents;

● Intelligent algorithm provides high reliability and high accuracy measurement;

● LED light source with a lifetime of up to 100,000 hours;

● The digital sensor adopts the standard MODBUS protocol and can be directly connected to the network;

● Smart transmitter has data recording, query and analysis functions;

● Provide various output interfaces such as 4 ~ 20mA, RS232 / 485 and programmable relay;

● The measurement is not affected by solid impurities, color and a small amount of bubbles, and automatic temperature compensation;

● Various installation methods: immersion, plug-in, pipeline, sampling.

High precision

Measurement range: refractive index (nD): 1.32500 ~ 1.37500 Brix: 0 ~ 25

Resolution: 0.1% FS, Brix: 0.02

Accuracy: 0.25% FS, Brix: 0.05

Measuring temperature: 0 ~ 80 ℃

High range type

Measurement range: refractive index (nD): 1.32500 ~ 1.51500 Brix: 0 ~ 85

Resolution: 0.1% FS, Brix: 0.1

Accuracy: 0.25% FS, Brix: 0.2

Measuring temperature: 0 to 80 ° C (normal temperature type) 0 to 130 ° C (high temperature type)

(Note: other range or temperature measurement can be customized)


Power supply: 12VDC ± 10%

Interface: RS485 / MODBUS RTU / ASCII (sensor can be used alone)

Protection class: IP68

Material: Sapphire prism, 316L or Alloy20 (optional)

Temperature range: 0 ~ 80 ℃ (automatic temperature compensation)


Power: 220VAC / 24VDC ± 10%

Output interface: 4 ~ 20mA (optional dual channel)

RS485 or RS232 / MODUBUS RTU or ASCⅡ / Custom

Output relay: 3 programmable relays can be set as upper and lower limit alarms or timing control respectively

Protection class: IP65

Ambient temperature: 0 ~ 60 ℃