Working principle of online refractometer
Refractive index (also known as refractive index, refractive index R.I.) is a physical constant of a substance. Pure substances of solids, liquids and gases have a certain refractive index.
For general liquid compounds, when light passes through liquids of different concentrations, it will produce different refractive indexes. The higher the concentration, the greater the refractive index. According to the empirical change rule of "solution refractive index - solute concentration" (20°C), you can use A refractometer easily measures the concentration of solutes.
Refractive index is a specific intrinsic property of a substance. and changes depending on temperature and wavelength. Therefore, with a refractometer, when the temperature and wavelength are known, the concentration of the liquid can be detected by detecting the refractive index. Of course, different substances may have the same refractive index at different concentrations.
Therefore, concentration detection based on refractive index should be as close as possible to binary mixtures (liquids consisting of only two components). Of course, in practical applications, if the concentration change of a multi-component solution system (the liquid contains multiple components) is only caused by the change of one of the components, it can be accurately measured by detecting the refractive index. This is also a quantitative measurement. Mixed liquids of known composition can be tested for quality. For example, for mixtures like olive oil or orange juice, the measurement value is guaranteed to be within a certain range, which can effectively ensure product quality.
Online refractometer structure and function
The online refractometer adopts a split structure design and is divided into two parts: sensor and transmitter.
Sensor: composed of sapphire prism (9Mosh), built-in PT1000 temperature sensor, long-life LED light source 100000h, CCD sensor with 3648 pixel resolution;
Transmitter: Intel 586sx 133MHz CPU, 6.7" (640×480 pixels) TFT-LCD display, keyboard, EPROM memory card and automatic cleaning system. The instrument adopts a fully shielded interference design, high temperature and vibration resistance, wide range, Factory linear calibration and automatic temperature compensation. The instrument operates with friendly software. It has a built-in temperature sensor to detect the process temperature of the protein solution online and a remote signal of 0-10V. The instrument can use RS-232 to communicate with the host computer and can Communicates with DCS through 4~20 mA signal. DCS controls and regulates the concentration of process chemical solution.
