Intelligent online density meters are automated measuring instruments for online density measurement of various liquids or liquid states. They are widely used in the oil industry for detecting oil, refining, blending, and oil-water interface; in the food industry for measuring the density of grape juice, tomato juice, fruit syrup, vegetable oil, and soft drinks; in the paper industry for detecting the density of blackstock, greenstock, whitestock, and alkali solutions; and in the chemical industry for cleaning agents, ethylene glycol, carbonates, urea, and polymer densities. They are also extensively used in the dairy industry, mining, and more.
The intelligent online density meter continuously measures the density of liquids online without any process interruption. It can be directly used for process control. It features an integrated two-wire transmitter structure, with no moving parts for easy installation and maintenance.
Smart Online Density Meters (also known as online density transmitters) are devices used for continuous on-line measurement of liquid concentration and density, suitable for direct application in industrial production processes. The meters utilize advanced technology, including a high-precision differential pressure sensor and a pair of pressure relays connected to or inserted into the production process. Between the two pressure relays is a temperature sensor, used to compensate for changes in the process liquid's temperature. Our company's smart online density meters are two-wire density transmitters, primarily used for industrial process control. The on-line density meters generate corresponding 4-20mA signals based on the concentration and density levels, allowing for remote calibration and monitoring via digital communication.

Operating PrincipleThe Intelligent Online Density Meter is essentially a differential pressure transmitter. Its working principle is that the pressure exerted by a liquid column of a certain height is directly proportional to the density of the liquid.
That is to say:P=ρgh                 In the formula:P—— Pressure generated by a liquid column of a certain height
P—— The density of the liquid
g—— Measurement of Earth's gravitational acceleration
H—— Manometer height
Based on the pressure values measured by a precision pressure gauge, under the condition that the gravitational acceleration at the measurement location (fixed coefficient) and the height of the liquid column are known, the density of the measured liquid can be obtained. Therefore, the height is a fixed value and needs to be determined in advance with the manufacturer.Application FieldsIndustrial Automation Applications
Petroleum Refining, Chemical Industry
Liquid Density Measurement for Food Industry
Sanitary Applications
Mining / Papermaking IndustryProduct FeaturesMultiple installation methods, plug-in measurement, pipe horizontal installation, side installation
This online density meter is suitable for flowing or static liquids.
A two-wire transmitter with an integrated structure, featuring no moving parts for easy maintenance.
No need for standard reference source, lab calibration, or process interruption for online densitometer calibration.
Ideal for measuring high and low temperatures, as well as media with high viscosity and impurities.
Superior overvoltage protection structure, excellent temperature stability, full-welded sealed, robust and reliable design
intrinsically safe for hazardous environments
Sanitary type suitable for food and production areas
Simplified maintenance, no need for regular cleaningSelection SpecificationsOrdering Guide