Online Density Meter – Differential Pressure Type

Features of Online Density Meters

1. This online density meter works with liquid that is moving or still, and can be installed in pipelines or tanks.
2. The two-wire transmitter with an integrated structure has no moving parts and is easy to maintain.
3. Continuous online measurement of liquid density and temperature without process interruption. It can be directly used for production process control.
4. Dual four-digit LCD display.
5. Can see temperature and density together, which helps with converting density for industry standards.
6. The density meter has several different wetted materials.
7. It is easy to install and use, and the reading can be displayed after inserting the liquid.
8. Simplified maintenance, no need for regular cleaning.
9. Calibrating an online density meter is easy. You don’t need a reference source or lab calibration. Plus, it won’t interrupt the process.
10. Intrinsically safe type can be used in dangerous sites.
11. The hygienic density meter can be used in the food industry for measuring liquids and soft drinks at different production sites.
12. The anti-corrosion density meter measures acid and alkali solutions, chemical carbamide, detergent, and more.
13. In high temperature working conditions of 100°C~150°C, there are special specifications like high temperature and horizontal pipe. These specifications are designed for the site environment.

Technical Parameters

Measuring range:	0.000– 3.000 g/cm3 (0000–3000kg/m3) (users can freely choose the measurement range)
Calibration range:	0.500– 3.000 g/cm3 (500–3000kg/m3) (calibrated according to the measurement range selected by the user)
measurement accuracy:	±0.01g/cm3, ±0.005 g/cm3, ±0.002g/cm3 (users can choose the applicable accuracy)
Repeatability:	± 0.0005 g/cm3 (± 0.5kg/m3)
Operating temperature range:	-50°C~+250°C (different medium temperature is optional, divided into low temperature, normal temperature, high temperature type)
Work pressure:	7.0MPa
Fluid Viscosity Range:	0–20000cP
Temperature Coefficient:	Less than 0.1kg/m3/℃ (after correction)
Pressure effects:	negligible
Built-in temperature sensor:	PT1000
Wetted material:	316L, Hastelloy C-276, Tantalum, Titanium, PTFE (Teflon)
Power supply:	24VDC, ≥50mA
Intelligent signal output:	4-20Ma, RS485ModbusRTU
Display method:	High-definition backlight LCD liquid crystal meter display
Output accuracy (20°C):	±0.5% of reading or ±0.2%FS
Output repeatability (-40 ~+85°C):	±0.1%FS
Process connection:	Thread type, flange type, hygienic type (dimensions can be customized according to the site or user’s own requirements)
Shell:	aluminum alloy
Protection class:	IP67
Explosion-proof grade:	EXdⅡCT6
Temperature:	-30~150℃ (optional)

Application field of online density meter

1. Sugar industry and wine industry
   Squeeze fruit juice, syrup, grape juice, lime juice density, alcohol GL, molasses, hexane/ethanol interface, etc.
2. Dairy industry
   Condensed milk, lactose, cheese, dried cheese, lactic acid, etc.
3. Mining
   Coal, potash, brine, phosphate, calcium compounds, limestone, copper, gold, etc.
4. Refining
   Lubricating oil, fragrance, fuel oil, vegetable oil, etc.
5. Food processing
   Tomato juice, grape juice, lemon juice, tomato paste, molasses, vegetable oil, fructose syrup, jelly, jam, etc.
6. Pulp and paper industry
   Black pulp, green pulp, pulp cleaning, evaporator, caustic alkali, etc.
7. Beverage processing
   Beer, soft drink, fruit wine, instant coffee, malt, etc.
8. Chemical industry
   Caustic soda, acid, carbamide, detergent, polymer density, glycol, sodium chloride, sodium hydroxide, etc.
9. Petrochemical
   Natural gas, oil and gas washing, kerosene, lubricating oil, oil/water interface, etc.

online density transmitter working principle

The density of liquids cannot be measured directly.

In industry, density meters are categorized based on the principle they use, like float, vibration, ultrasonic, or differential pressure.

To measure the static liquid, assume its density is uniform. Let ρ be the density, g be the gravity, and h be the height of the liquid column. The static pressure of the liquid column is P = ρ g h.

The density of a liquid can be calculated by measuring the static pressure and height of the liquid column.

The static pressure density meter can measure the density of high viscosity liquids. However, it is easily affected by fluctuations in liquid level.

To remove the impact of liquid level changes, we often use the differential pressure method. This method involves the liquid flowing through a vertical conduit. Install two pressure sensors spaced h apart on the conduit. The measured pressures are P 1 and P 2 , respectively. After measuring the pressure of two liquid columns of different heights. It can be obtained from formula (1): P 1 – P 2 =ρ g (H 1 – H 2 ).

H 1 , H 2 are the heights of the two pressure sensors from the liquid surface, P is the density of the liquid to be measured, and g is the acceleration of gravity.

Let P 1 – P 2 =ΔP , H 1 -H 2 =h, from the formula (sample):

More Density meter and measurement analysis solution.

Differential Pressure Online Density Meter is a cost-effective, simple and practical. That is economical and accurate. A measurement method with low maintenance workload and stable and reliable operation. It is suitable for detecting the density of flowing or static liquid. Sanitary type, high temperature type and anti-corrosion type are optional.

Online Density Meter (hydrometer) can detect and measure the density of various liquids or liquid mixtures online. In the petrochemical industry, it can be widely used in petroleum, oil refining, oil blending, and oil-water medium detection; in the food industry, it can be used for grape juice, tomato juice, Production sites such as fructose syrup, vegetable oil and soft drink processing; Dairy industry; Paper industry; Measurement of black pulp, green pulp, white pulp, and alkali solution; Alcohol in winemaking; Chemical carbamide, detergent, ethylene glycol, acid-base And the measurement of polymer density. It can also be used in industries such as mining brine, potash, natural gas, lubricating oil, and biopharmaceuticals.

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Sino-Inst is a professional Online Density Meters manufacturer and supplier. Our Online Density Meters are exported to various countries like USA, UK, Germany, Nigeria, Saudi Arabia, Singapore, etc. If you need to measure density, please feel free to contact our sales engineers.

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