I. Introduction to Online Concentration Detection and Process Optimization for Chemical Raw Liquids

Online refractometer, also known asOnline concentration meter, online refractive index concentration analyzer, based on the principle of total reflection critical angle of light in liquid, detects the liquid refractive index in real time, and converts and outputs solution concentration, sugar content, solid content, and medium temperature, achieving real-time detection of liquid in production pipelines and reactors.Uninterrupted in-situ online monitoring。

No manual sampling or reagent consumables required; the probe is directly installed in pipelines, tanks, or bypass loops for 7×24-hour continuous detection, with measurement data uploaded to the central control system in real time. It can be linked with PLC/DCS for closed-loop automatic concentration control, replacing traditional manual titration and handheld refractometer spot checks, eliminating pain points such as sampling lag, large human errors, and unstable batches. Widely used for liquid concentration control in industrial production processes.

The instrument is divided intoProbe + transmitter split type / integrated display typeTwo structures available: standard industrial type and sanitary food-grade, explosion-proof, and anti-corrosion type, suitable for transparent and semi-transparent liquids; slightly turbid media can also be measured stably without interference from liquid color.

II. Measurement Principle of Online Concentration Detection and Process Optimization for Chemical Raw Liquids

The light source emits light onto the contact surface between the sapphire prism and the measured liquid. When light enters the liquid from the prism, total reflection occurs; the CCD photosensitive array captures the position of the total reflection critical ray, calculates the liquid refractive index, and combined with the built-in temperature compensation algorithm, converts the refractive index into the corresponding solution concentration value, while outputting real-time temperature data.

III. Core Technical Parameters of Online Concentration Detection and Process Optimization for Chemical Raw Liquids (Table Version)

Customizable explosion-proof, high-temperature, high-corrosion-resistant, and sanitary versions based on working conditions

Table

Item	Technical Specifications
Measurement medium	Transparent, semi-transparent aqueous solutions, organic solvents, acid-base salt solutions, syrups, emulsions, etc.
Concentration measurement range	0-90 % Brix (customizable medium-specific concentration range)
Concentration measurement accuracy	±0.1 %
Concentration Resolution	0.01%
Refractive index measurement range	1.3330‑1.5000RI
Refractive index accuracy	±0.0001 RI
响应速度	≤5 seconds
Medium temperature range	-20℃ ~ +100℃ (high-temperature version up to 130℃)
Temperature compensation	Built-in automatic multi-point temperature compensation, automatically normalized to 25℃ standard concentration
Standard wetted materials	316L stainless steel + sapphire prism, corrosion-resistant options: Hastelloy, Alloy20
Pressure rating	1.5MPa（16bar）
防护等级	IP68
Explosion-proof rating (optional)	Ex ia IIC T6 intrinsic safety explosion-proof
信号输出	4-20mA analog signal, RS485-Modbus RTU digital communication, 2 relay alarm outputs
Power supply	DC24V
安装方式	Pipe flange, tri-clamp sanitary connection, side-mounted tank, bypass installation, immersion suspension installation
Sanitary version suitable for	Supports CIP/SIP in-place cleaning and sterilization, no sanitary dead corners

IV. Main Functional Features of Online Concentration Detection and Process Optimization for Chemical Raw Liquids

1. Real-time continuous online monitoring: No need for shutdown and sampling, 24-hour continuous detection, with no lag in concentration data.
2. Automatic temperature compensation: Eliminates measurement deviation caused by liquid temperature fluctuations, ensuring stable and reliable data.
3. No consumables, no reagents: Optical non-contact measurement, no moving parts, low later maintenance cost, and long service life.
4. Custom concentration modelingBuilt-in curves for common media such as sugar, alkali, and alcohol; for non-standard formula solutions, calibration data can be manually entered to fit a dedicated concentration conversion curve.
5. Upper and lower limit alarm function: Automatic relay alarm for concentration exceeding limits, with external audible and visual alarm.
6. Industrial signal interfacing with central control: 4-20mA, RS485 can be directly connected to PLC and DCS control systems for closed-loop control of automatic feeding, dilution, and evaporation concentration.
7. Probe self-diagnosis function: Automatically identifies prism fouling and light source abnormalities, and promptly prompts cleaning and maintenance.
8. Multiple installation options available: Direct pipeline, bypass loop, reactor side wall, and immersion suspension in tank, suitable for retrofitting new and existing production lines.
9. Sanitary / explosion-proof and anti-corrosion optional: No dead corners for food and pharmaceutical hygiene; explosion-proof version for flammable and explosive chemical conditions; special alloy probe for highly corrosive liquids.
10. Historical trend recording: The transmitter can store concentration-temperature trend data for production traceability and quality control.