Portable density meter

Introduction

A portable density meter is a handheld instrument used to measure the density or specific gravity of liquids, and it is used in the food and beverage, chemical, pharmaceutical, petroleum, and many other industries for quality control, process monitoring, and field measurements. The portable density meter measures the density using the oscillating U-tube principle, in which the liquid is introduced into a small U-shaped glass tube that is oscillated electronically, and the frequency of the oscillation, which depends on the mass and thus the density of the liquid in the tube, is measured and converted to a density value; the meter provides a rapid and accurate measurement with a small sample volume, and it measures the density in units such as grams per cubic centimeter or kilograms per cubic meter, and it may also measure related parameters, such as the specific gravity, the concentration of solutions, such as the Brix of sugar solutions and the alcohol content, and the temperature, with automatic temperature compensation; the portable meter is battery-operated and designed for field use, with a digital display and a sample cell that is filled with the sample. Portable density meters are used for measuring the density of beverages, such as juices, wines, and soft drinks, for measuring the density of chemical solutions, for checking the concentration of cleaning solutions and coolants, for measuring the density of petroleum products, for quality control, for process monitoring, for research, and for many other applications, and they are used in the field and in the laboratory. With their accuracy and portability, portable density meters are essential instruments for density measurement.

Portable Density Meter LPDM-T2010

Portable Density Meter measures 0 g/cm³ to 3.0 g/cm³ density at a temperature range from 5°C to 55°C suitable for a wide spectrum of liquids in variable temperatures. Our meter offer...

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Standards

ASTM D7777-24-Standard Test Method for Density, Relative Density, or API Gravity of Liquid Petroleum by Portable Digital Density Meter

ISO 15212-1:2018-Oscillating-element density meters-Laboratory instruments

ISO 15212-2:2018-Oscillating-element density meters-Process instruments for homogeneous liquids

Complies with the above standards, but is not limited to them.

Features

1. Portable density meter for rapid measurement of liquid density and specific gravity.

2. Digital oscillating U-tube or hydrometer method for field and laboratory density measurement.

3. Suitable for petroleum, chemical, food, beverage, pharmaceutical, industrial and field use.

4. Includes measurement cell, display, controller, battery, sampling and operation manual.

5. Supports rapid density measurement for quality control, field testing and process monitoring.

FAQ

Q1: What testing scenarios is this meter mainly applied to?

A: The portable density meter is used in petroleum industry, chemical manufacturing, food and beverage, pharmaceutical production, industrial quality control, field testing, transportation and research to rapidly measure the density and specific gravity of liquids in the field or laboratory using digital oscillating U-tube technology (or digital hydrometer) for quality control, product specification compliance, field testing and process monitoring. It supports petroleum product density testing (gasoline, diesel, jet fuel, crude oil, lubricants - density for API gravity calculation, custody transfer, quality control), chemical product density measurement (solvents, acids, bases, solutions), food and beverage density testing (sugar content/Brix in beverages, milk, edible oils, syrups), pharmaceutical solution density measurement, industrial process fluid density monitoring, field testing at storage terminals, transport vehicles (tank trucks, ships), and pipeline batch testing, and general liquid density measurement. The portable design allows rapid, on-site density measurement without sending samples to a laboratory, supporting real-time quality control and decision-making in field and industrial settings.

Q2: What standards does the meter comply with?

A: The portable density meter follows relevant ISO, ASTM and GB/T standards for liquid density measurement, including ISO 12185 (crude petroleum and petroleum products - density by oscillating U-tube), ASTM D4052 (density, relative density, API gravity by digital density meter), ASTM D5002 (density by digital analyzer), and relevant GB/T standards including GB/T 29617 (digital density meter for petroleum). The hardware complies with IEC 61010 safety standards. Calibration should use certified reference materials (e.g., certified density standards - water, air, certified hydrocarbon standards) traceable to international standards. Temperature compensation is critical (density is temperature-dependent - most meters have built-in temperature compensation to 15 degrees C or 20 degrees C per standard). Users should verify the specific standard for their liquid type (petroleum, chemical, food) and required reference temperature (15 degrees C for petroleum per ISO/ASTM, 20 degrees C for many chemicals/foods per ISO).

Q3: What is the warranty period for the whole meter and key components?

A: The whole portable density meter is covered by a 12-month warranty. The measurement cell (oscillating U-tube), electronics, display, controller and housing are covered, while batteries, syringe/filter (sampling accessories), calibration standards and fuses are consumables or accessories. Damage from improper use, sample cell contamination/corrosion, dropping or unauthorized repair is excluded. Extended warranty may be available for industrial/professional models. The oscillating U-tube is a precision component - damage from aggressive chemicals or particulate can affect accuracy.

Q4: Is this device difficult to operate? Is professional training required?

A: Operation requires trained personnel familiar with density measurement, sample handling and meter calibration. We provide operation manuals, training and application support. Proper sample preparation (homogeneous, bubble-free, proper temperature), sampling technique (fill cell slowly to avoid bubbles, rinse cell with sample before measurement), calibration (air/water or certified standard), temperature compensation setting, result interpretation (density, specific gravity, API gravity, Brix) and quality control are important for accurate, reliable density measurement. The measurement cell must be clean and bubble-free for accurate readings.

Q5: What is the typical lead-time for order delivery?

A: Standard models require 7-30 working days. In-stock units can ship within 3-7 working days. Custom configurations or large built-to-order systems may require additional time, and we confirm the exact schedule before order confirmation.

Q6: Is regular calibration required? What is the recommended calibration cycle?

A: Calibration with certified reference standards (air and water, or certified density standard) recommended every 1-3 months for field/industrial use, or per quality system. Routine verification with a check standard before each use or per batch. Measurement cell cleaning and inspection regularly (residue, contamination, corrosion). Full meter performance verification annually with certified standards across the measurement range. Temperature sensor calibration every 6-12 months. Battery performance checked.

Q7: Are supporting consumables universal?

A: Calibration standards (certified density standards, distilled/deionized water), syringes, filters, sampling accessories, cleaning solutions (isopropanol, distilled water), batteries and fuses are available from laboratory suppliers, though calibration standards should be certified and traceable. Long-term consumable cost depends on usage and calibration frequency.

Q8: Can I customize parameters or supporting accessories?

A: Customization includes measurement type (oscillating U-tube for high accuracy, digital hydrometer for basic), accuracy class (0.0001 g/cm3, 0.001 g/cm3), measurement range, temperature range, temperature compensation (15 degrees C, 20 degrees C, custom), calculated values (API gravity, Brix, alcohol content, concentration), data logging, connectivity (Bluetooth, USB), explosion-proof rating (for hazardous areas - petroleum/petrochemical), language and accessories. Additional sampling kits, calibration standards and accessories can be ordered separately. Custom orders extend delivery lead-time, especially for explosion-proof models.

Q9: Does the purchase include on-site installation and commissioning service?

A: No complex installation is required for portable density meters. The package includes the meter, sampling accessories and instruction manual. On-site training and calibration are available at additional cost for industrial/petroleum field setup.

Q10: What types of liquids are compatible with this equipment?

A: The portable density meter measures density of liquids including petroleum products (gasoline, diesel, jet fuel, crude oil, lubricants, fuel oil), chemicals (solvents, acids, bases, solutions, mixtures), food and beverages (sugar solutions, milk, edible oils, beverages, syrups, alcohol), pharmaceuticals (solutions, suspensions), and other homogeneous liquids within the liquid type, viscosity, density range and measurement cell material compatibility specification. Different liquid types require specific considerations: viscous liquids (syrups, heavy oils, glycerin) may be difficult to fill into the U-tube (use syringe, warm slightly to reduce viscosity, allow time for bubble removal); volatile liquids (gasoline, solvents, alcohol) can evaporate during measurement (fill quickly, seal cell if possible, measure at proper temperature - evaporation causes cooling and bubble formation); corrosive liquids (strong acids, bases) may attack the measurement cell (verify cell material compatibility - Hastelloy C-276 for corrosive, glass for general; do not use with liquids that attack the cell material); liquids with suspended particles (slurries, unfiltered samples) can scratch or contaminate the U-tube (filter samples before measurement, or use a meter designed for slurries); very high viscosity liquids may not be suitable for oscillating U-tube meters (use a different method - vibrating fork, microwave, or laboratory pycnometer). Users should follow the specific test method (ISO 12185, ASTM D4052, ASTM D5002, GB/T 29617) for sample handling and measurement, ensure the sample is homogeneous (mix well before sampling, especially for mixtures or samples that may separate), fill the measurement cell properly (use syringe, fill slowly to avoid bubbles, ensure cell is completely filled with no air bubbles - bubbles are the most common cause of inaccurate readings; if bubbles are visible, refill the cell), rinse the cell with sample before measurement (to remove residue from previous sample - at least 2-3 rinses), allow temperature equilibration (wait for the sample temperature to stabilize within the meter temperature control/compensation range - density is highly temperature-dependent, typically -0.001 g/cm3 per degree C for many liquids), calibrate regularly with certified standards (air and water at minimum, or a certified density standard close to the sample density - verify calibration before each use for critical measurements), report results with the reference temperature specified (density at 15 degrees C for petroleum per ISO/ASTM, at 20 degrees C for many chemicals/foods - always state the temperature, as density without temperature is meaningless), and for custody transfer or regulatory compliance, use a meter with appropriate accuracy and certification (ISO/ASTM compliant, calibrated with traceable standards, proper documentation). The measurement cell should be cleaned after each use (rinse with appropriate solvent - water for aqueous samples, isopropanol or appropriate solvent for organic samples, then dry with air - residue buildup affects accuracy; for viscous samples, use more rigorous cleaning). The cell should be inspected regularly for damage (cracks, corrosion, deformation - damaged cell gives inaccurate readings and may leak). For field use, protect the meter from extreme temperatures (operating range typically 10-40 degrees C - allow meter to acclimate if moved between temperature extremes), dust, and moisture (use protective case, avoid getting liquid on the meter exterior). For hazardous area use (petroleum refineries, tank farms, chemical plants), use an explosion-proof (Ex-rated) meter certified for the area classification (Zone 1/Zone 2, Class I Division 1/2) - standard portable meters are NOT intrinsically safe and should not be used in flammable atmospheres. Waste (used samples, cleaning solvents, calibration standards) should be disposed of per applicable regulations (petroleum products, solvents, acids/bases are hazardous waste - do not pour down drain). The meter should be stored in a protective case with the cell clean and dry (do not store with liquid in the cell - can cause contamination or corrosion). For long-term accuracy, have the meter calibrated by an accredited laboratory annually (ISO/IEC 17025 calibration) with a calibration certificate traceable to national standards.