Name: Liquid Concentration Meter - Optical Principle - Sino-Inst
Brand: Sino-Inst
SKU: Liquid Concentration Meter - Optical Principle
Availability: InStock

Liquid Concentration Meter - Optical Principle

Optical liquid concentration meters calculate concentration values based on the different refractive indices of media with varying concentrations. They utilize the diffusion characteristics of light spectra in liquids, sampling through a high-resolution spectral sensor, and analyzing the data using software to determine the concentration patterns. Temperature compensation is then applied to measure the concentration of various liquids or liquid mixtures.

This is one of the most commonly used liquid density technologies in laboratory and industrial settings.

RFQ More Density Meters

Features

By capturing the absorption, refraction, or scattering properties of solutes in solutions, a mathematical model linking optical signal changes to concentration is established.
Features automatic temperature compensation, high precision, excellent stability, and simple installation and operation;
The liquid must possess sufficient transparency.
Suitable for measuring concentrations of ammonia water, urea, sodium hydroxide, sodium sulfate, DMF, and similar substances;
Can be installed in pipelines or on container walls.
Measures liquids with viscosities below 5000 MPa·s.

Technical Specifications

Accuracy	±0.5%
Operating Range	0~100% (20℃), calibrated to a specific range depending on usage
Repeatability	±0.2%
Process Temperature Influence (Corrected)	±0.001% (per℃)
Process Pressure Influence (Corrected)	Negligible
Process Temperature	–10℃～+60℃
Ambient Temperature	–10℃～+45℃
Temperature Coefficient	0.1%/m³/℃ (after calibration)
Built-in Temperature Sensor	Temperature chip
Wetted Parts Material	316L, PTFE
Glass	Acid and alkali resistant
House Material	IP65, aluminum alloy
Maximum Operating Pressure	0.8MPa
Test Pressure	Tested at 1.5 times the maximum working pressure
The actual maximum working pressure is limited by the process connection rating.
Process connection type	Flange
Process connection type	Clamp
Explosion-proof certification	Ex d ⅡC T6 Gb
Power requirements	24 VDC, 50mA
Output	Four-wire system, 4-20mA
Viscosity range	<5000MPa.s

Liquid and material compatibility:

Type	Name	Molecular formula	concentration(%)	316L	Hastelloy	titanium alloy	zirconium	PTFE
Acids	Hydrochloric acid (excluding hydrofluoric acid)	HCI	0-40	×	○	×	☆	☆
	Sulfuric acid	H2SO4	0-50	○	☆	○	☆	☆
		H2SO4	50-75	×	○	×	○	☆
		H2SO4	75-98	○	☆	○	○	☆
	Nitric acid	HNO3	0-100	○	○	○	○	☆
	Phosphoric acid	H3PO4	0-98	×	×	×	×	☆
Bases	Sodium hydroxide	NaOH	0-50	☆	☆	☆	○	☆
	Potassium hydroxide	KOH	0-50	☆	☆	☆	○	☆
	Calcium hydroxide	Ca（OH）2	0-50	☆	☆	☆	○	☆
Salts	Sodium chloride	NaCl	0-50	×	☆	☆	☆	☆
	Ammonium chloride	NH4Cl	0-50	×	☆	☆	☆	☆
	Ammonium sulfate	(NH4)2SO4	0-50	×	☆	☆	☆	☆
Others	Urea	(NH2)2CO	0-100	☆	☆	○	☆	☆
	Sodium hypochlorite	NaOCI	0-16	×	○	×	☆	☆
	Hydrogen peroxide	H2O2	0-90	☆	☆	○	☆	☆
☆Recommended ○Use under specific concentration and temperature limits ×Do not use

Liquid Concentration Meter – Optical Working Principle

Optical concentration meters utilize the diffusion patterns of spectra in liquids. High-resolution spectral sensors sample the light, and software analyzes and processes the data to determine concentration patterns. Temperature compensation is then applied to measure the concentration of various liquids or liquid mixtures.

An optical concentration meter consists of a transmitter and a sensor. The sensor can be easily installed in pools, drains, pressure pipelines, or natural water bodies. It automatically compensates for interference caused by contamination. The sensor has an air-cleaning function that automatically cleans itself at preset times, reducing maintenance workload.

The light emitted from the transmitter on the sensor is absorbed, reflected, and scattered by the analyte during transmission, with only a small portion reaching the detector. The transmittance of the transmitted light is related to the concentration of the wastewater being measured; therefore, measuring the transmittance allows calculation of the wastewater concentration.

Four-beam technology uses two detectors and two transmitters. The light emitted from the transmitter is transmitted and reaches the two detectors. This series of optical paths forms a data matrix. Analyzing these data signals reveals the concentration of suspended solids in the medium. It also effectively avoids interference and compensates for deviations caused by contamination. The instrument can operate even in harsh environments.

Media restrictions		Bubbles, Flow Velocity	Maximum Liquid Viscosity
Particles	Transparent
Trace particles	Transparent, pure liquid	Minimal bubbles	5000MPa.s
		Flow velocity > 1.5 m/s

Featured Applications

The petrochemical industry can be widely applied to testing in petroleum, refining, and blending operations;
The food industry for production sites processing grape juice, tomato juice, fructose syrup, vegetable oils, and soft drinks;
Dairy industry;
Paper industry;
Measurement of black liquor, green liquor, white liquor, and alkali solutions;
Chemical industry: measurement of urea, detergents, ethylene glycol, acids/bases, and polymer density;
Textile dyeing industry: measurement of ammonia water concentration;
De-NOx industry: measuring ammonia water concentration (0~30%);
Wine industry: measuring alcohol content in brewing; quality control, continuous online monitoring;
Organic and inorganic chemical materials: sodium hydroxide. Acid/alkali concentration control;
Pharmaceutical industry: Chinese herbal medicine concentration, alcohol recovery;
Battery industry: Lithium hydroxide, electrolyte, sulfuric acid solution concentration;
Mineral processing: Clay, carbonate, silicate.
Also applicable in mining brine, potash, lubricants, biopharmaceuticals, and other industries.

What Is a Density Meter? And Guide to Types

What Is a Density Meter? We are discussing industrial density meters here, not laboratory densitometers. Industrial density meters are devices specifically designed to measure fluid density, performing real-time online density detection and displaying data such as density and temperature. They also support outputs of 4-20 mA, 0-1000Hz, RS485 Modbus RTU, HART, and other signals, facilitating … Read more

Online optical concentration meters are specifically designed for measuring the concentration—density— of liquids. They are commonly used to measure the concentration of chemical liquids such as ammonia, urea, cleaning agents, ethylene glycol, and acid/alkali solutions.

We at Sino-Inst supply various types of concentration meters and densitometers, and support customized measurement parameters. Please feel free to contact our sales engineers!

Liquid Concentration Meter - Optical Principle - Sino-Inst

Product SKU: Liquid Concentration Meter - Optical Principle

Product Brand: Sino-Inst

Product In-Stock: InStock

Editor's Rating:
5

Liquid Concentration Meter – Optical Principle