Density Meter

Rudolph Research Analytical - Density Meter

Rudolph’s Automatic Density Meters are for liquid or viscous samples. Ideal for industries such as Chemical, Petroleum, Pharmaceutical, Petrochemical, Flavour and fragrance, Sugar and ethanol, and Beverage. 

Why Our Density Meter?

  • Rudolph’s Density Meter has the patented VideoView™ (Patent No. 7,437,909), which is a camera that can be zoomed 2x, 6x, 10x to see if there are bubbles in the sample cell that can disrupt the reading
  • Rudolph offers a 20-year commitment to ensuring your instrument remains fully operational, making the long-term cost of ownership one of the lowest in the laboratory market. As of the publication date of this document, no other laboratory instrument manufacturer provides a similar guarantee of service and technical support for 20 years.
  • Rudolph’s Density Meter can measure samples from 0°C to 90°C, only a few in the market can do it
  • Highly configurable. From sample loading options, to be able to combine different instruments such as the refractometer or polarimeter to produce measurement routines on up to 240 samples. We can design a custom configuration just for your application.
  • The Rudolph Research  Density Meter’s oscillating U-tube with full range viscosity correction and reference oscillator (Patent No. US7735353B2). This technology ensures long-term calibration stability and accurate measurements across all temperatures with just a single calibration.
  • Portable handheld model available
  • cGMP/GLP calibration and printing
  • Traceable calibration standard. Either a NIST or UKAS standard
  • Windows OS and versatile communication capability

How to select an Automatic Density Meter model

The questions below will help you determine which model best suits your needs.
  • What is your application? Do you have standards like ASTM?
  • Do you need higher accuracy?
  • Do you need higher temperature control?
  • Are sample volume not a problem?
  • Do you want to reduce consumables usage?
  • Do you need portable handheld model?
 The differences of our Automatic Density Meter are only in accuracy, temperature control range, and sample loading options.
 
Instrument Models
DDM 2909

This is our entry-level model.

  • Accuracy of Density: 0.0001 g/cm3 | Temperature: 0.05 °C
  • Temperature control range: 0°C – 70°C
DDM 2910

This model and DDM 2909 differ in temperature control range and temperature accuracy.

  • Accuracy of Density: 0.0001 g/cm3 | Temperature: 0.03 °C
  • Temperature control range: 0°C – 100°C
DDM 2911

This model has higher accuracy than DDM 2910.

  • Accuracy of Density: 0.00005 g/cm3 | Temperature: 0.02 °C
  • Temperature control range: 0°C – 100°C
DDM 2911 Plus

This model has higher accuracy than DDM 2911.

  • Accuracy of Density: 0.000010 g/cm3 | Temperature: 0.01 °C
  • Temperature control range: 0°C – 100°C
DDM 29 (Portable Handheld)

This portable handheld touchscreen model has internal storage of up to 3000 measurements. It is powered by a rechargeable battery, lasting 4-8 hours.

  •  Accuracy of Density: 0.0005 g/cm3 | Temperature: ±0.1°C
  • Temperature control range: 20°C or 25°C
  • Ambient temperature: 0°C to 35°C
 Sample Loading Options
 There are 4 types of sample loading. We recommend choosing from Vertical Load, Load Assist, or Autofill. Horizontal Load is not desirable because of many downsides compared to Vertical Load.
 
Horizontal Load

  • The cheapest sample loading option
  • Use a syringe (consumable) to load the sample
  • Fine option if you have fewer samples to test per day
Vertical Load

  • Prevents air bubbles forming with gravity
  • Use a syringe (consumable) to load the sample
  • Easier to clean than Horizontal Load due to gravity pushing the sample to the waste container
  • Users can apply more pressure for viscous samples
  • Easier for left handed operator compared to Horizontal Load
Load Assist
  • Very versatile, sample loading can be manually with a syringe (Vertical Load), or automatically with a syringe, flexible tubing, or the needle with the use of the peristaltic pump (Peripump)
  • Pressure mode available for carbonated samples
  • Easier to operate and clean because Peripump automatically push the sample and cleaning solvents
Autofill

  • Pour the sample into the well without the use of a syringe
  • Easier for inexperience operator
  • Great to minimise unwanted contact with volatile harmful sample
Optional Accessories
NIST/UKAS calibration standard

Tubing, luer cap, syringes, needle


Summary

First, you have to choose the models. Your accuracy and temperature control requirement can help with the selection.

Then choose your sample loading options. Horizontal and vertical loads are the most basic, with Vertical being better than Horizontal. Load Assist is the most versatile; samples can be loaded manually with a syringe or automatically with a syringe, flexible tubing, or stainless needle. Autofill is great to minimise contact with volatile samples and easier to load the sample.

Lastly, we also have some accessories and consumables if you ever need them like the NIST / UKAS calibration standard,  the tubing, syringes, luer cap, etc.

 

Applications

PETROLEUM 
 
CHEMICAL
  • Measure in Kg/m3, g/cm3, g/ml, pounds/gallon, specific gravity, Baumé.
  • Calculate concentration in terms of: %, molarity, normality, mole fraction, and ppm
  • Verify batch consistency and confirm correct blending ratios
  • All wetted materials are resistant to the most aggressive chemicals
  • Vast additional measurement and method options
 
PHARMACEUTICAL
  • Able to perform 3, 5, or more measurements, providing standard deviation, mean, minimum, and maximum readings for full cGLP/GMP compliance
  • Complete IQ/OQ/PQ documentation
  • raw materials and product release inspection
  • 21CFR11 Compliance; Electronic Signature and Secure Data Storage
  • Compliant with USP <841> ISO 17025, JP, BP, and EP
 
BEVERAGES
  • Test both alcoholic and non-alcoholic beverages with simple bubble detection using VideoView™
  • Precision measurement of °Brix determination, °Plato, °Balling, % Solids
  • Use the apparent density function to monitor proper filling volume
FOOD, FLAVOR, FRAGRANCE

• Measure Density, Specific Gravity
• Raw materials and product release inspection
• Monitor batch consistency and verify correct blending ratios
• Add refractive index, color, and optical rotation with R837 and R835 Automation Solutions

 

Videos

DDM Density Meter Series 4

Rudolph Research Density Meter Product Line Overview
Density Meter Rudolph DDM 2911 With the Easy Clean System