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DDM 2910 – Digital Density Meter (Densitometer) is designed to meet the requirements of your laboratory applications in Chemical, Petroleum, Pharmaceutical, and Beverage industries. Rudolph Research designed the DDM 2910 Digital Density Meter to meet the needs of the following industries and measurement needs in mind:

Product Category: Density Measurement

Industry: Biodiesel/Petrochemical, Distilleries, Food, Dairy and Wine, General Laboratory, Pharmaceutical, Personal Care and Natural Products

Supplier: Rudolph Research Analytical


Digital Density Meter Model DDM 2910 by Rudolph Research

DDM 2910 – Digital Density Meter (Densitometer) is designed to meet the requirements of your laboratory applications in Chemical, Petroleum, Pharmaceutical, and Beverage industries. Rudolph Research designed the DDM 2910 Digital Density Meter to meet the needs of the following industries and measurement needs in mind:
Digital Density Meter - DDM 2910
Measure API Values in accordance with ASTM D1250ASTM D4052ASTM D5002,  DIN 51757,  ISO 12185,  ASTM D4806, IP 365, and ASTM D5931

  • QC incoming raw materials
  • Research new products and additives
  • Withstands harsh and heavy use environments
  • Calibrate using petroleum standards


  • Measure in units of Kg/m3, g/cm3, g/mL, pounds/gallon, specific gravity, Baumé and more
  • Determine concentration in: %, molarity, normality, mole fraction, ppm, and more
  • Check batch consistency and ensure proper blending ratios
  • Wetted materials compatible with the most aggressive chemicals.


  • Capable of multiple measurements with standard deviation, min and max reading for true cGLP/GMP compliance
  • Complete IQ/OQ/PQ documentation
  • Checking of raw materials and product release
  • 21CFR Part 11 Compliance; Electronic Signature and Secure Data Storage
  • Compliant with USP 29<841>, JP, BP and EP


  • Measure both alcoholic and nonalcoholic beverages with easy bubble detection using VideoView™
  • Direct and accurate means of °Brix determination, °Plato, °Balling, % Solids
  • Use apparent density function for proper filling volume monitoring

On-Board Flexible Method Management

Factory installed density measurement methods allow for immediate selection of the correct method to match the most common applications. Easy to read fully Digital Density Meter display.
Digital Density Meter Screen
For unique measurement applications, create a sample method using an unlimited number of Concentration Tables, Formulas, and Polynomials to match the density measurement methods used in your laboratory or industry. A few customized sample methods shown below:

  • Concentration D2O – Heavy Water
  • Baumé of Hydrochloric Acid
  • Normality of Sulfuric Acid
  • Density of Gases and Aerosols
  • Drug to Propellant Ratio
  • Lead Content
  • ppm Gold in Acid
  • % Toluene in Heptane
  • Fat in Lubricant
  • Mole Fraction of Methanol
  • % HNO3
  • Monomer Solutions
  • Potassium Permanganate
  • Hydrogen Peroxide
  • Molar Solutions of EDTA
  • SG of Urine
  • Sweeteners
  • Sodium Hydroxide

Setting up your custom method on a Rudolph density meter for your specific application(s) is as simple as filling out a few screens like the one below:
Digital Density Meter Screen 2

Automatic, Digital Density Meter Features VideoView™ Bubble Detection

No more straining to see small difficult-to-detect air bubbles in your sample with live on-screen video viewing. On-screen bubble detection is made possible utilizing Rudolph’s exclusive, patented VideoView™ with 10X magnification.

Rudolph Digital Density Meters provide Full 21CFR Part 11 Instrument Level Compliance

The DDM 2910 Density Meter’s 21CFR Part 11 software module is easily enabled through the user friendly touch screen. This module gives you full compliance with:

  • Electronic Signature
  • Access Levels
  • Internal write protected storage
  • Unique passwords
  • Write protected documents sent directly to server

21 CFR Part 11 - Density Meter Screen

Oscillating U-Tube with Viscosity Correction and Reference Oscillator

(patent # 7,735,353)
The DDM 2910’s oscillating U-tube with full range viscosity correction and reference oscillator allows long term calibration stability and measurement at all temperatures with a single calibration.

cGMP/GLP Calibration

  • Calibrate the DDM 2910 with 2 or 3 Traceable Standards – calibrating with merely air and water appears inconsistent with cGMP/GLP compliance regulations. (see H&D Fitzgerald’s recommendations at
  • Can print out complete method configuration, communication settings, as well as calibration verification and calibration adjustment data/history.
  • Measured values can be shown continuously as temperature stability is being reached or, at the discretion of the user, measured values will only be displayed once the final answer is reached and completely stable.
  • Unlimited number of customized calibration adjustments and calibration verifications possible.
  • Complete History of Calibration Adjustments and Verifications are available to View, Print, and/or Export.
  • Possible to set calendar reminders as to when Calibrations are due.

Density Meter Screen 5

Windows Computer Based Flexibility

  • 32 gigabytes of internal memory allow almost unlimited capacity for saving measurement data. The DDM 2910 Density Meter is network ready and data may also be saved directly to your server or to any directory desired.
  • Internet access is possible directly from the DDM 2910’s touch screen.
  • Disk Protection feature protects the operating system against malware infections in networked environments.
  • Windows based navigation architecture is so intuitive that most operators will never read the manual. But should you wish to reference the manual, it is stored right on the DDM 2910’s internal memory
  • Copy methods, transfer concentration tables, download data, etc., via 2 of the 5 total USB ports which are conveniently located on front of unit.
  • Four total USB ports allow for quick and easy connection to a mouse, keyboard, printer, bar code scanner, or memory stick.

Density Meter Screen Export Settings

Versatile Communication Capability

The DDM 2910’s standard communication package includes:

  • Cat 5 Network Cable Connection
  • 5 available USB ports (2 Front, 3 Rear)
  • 2 RS 232 Ports

Allowing the Density Meter to directly:

  • Export measurement results to a thumb drive, store it locally on the C: drive, or easily send data to any external PC, LIMS, etc.
  • Print measurement results to a local or networked printer. Use any printer; just load the proper printer driver as you would with any PC.
  • Save measurement data direct to your Network/Server

cGMP/GLP Printing

Sample measurement reports are edited quickly and easily. Just import templates from Word® or Excel® to the DDM 2910 Density Meter and print your company’s customized “C of A” directly.
Density Meter Measurement Report

Traceable Density Meter Calibration Standards

Density Meter Calibration Standards
Rudolph knows how important it is to calibrate with Traceable Standards and therefore, we include either a NIST or UKAS standard in the accessories provided with all of our density meters. The DDM 2910 Density Meter’s standard accessories include:

  • Quick Start Guide
  • Rinse/Sample Waste Container
  • Filling Nozzles
  • Traceable Standards
  • IQOQPQ Documentation
  • Luer Syringes
  • Connecting Fittings & Tubing
  • Manual

Digital Density Meters integrated with Laboratory Automation equipment to provide flexibility

  • Rudolph’s AutoSampler can be loaded with up to 240 samples
  • Combine density and specific gravity measurements with simultaneous measurements of:
  • Refractive Index
  • Color
  • pH
  • Optical Rotation / Specific Rotation
  • Up to three different rinse solvents available for use; fully programmable
  • Two sample loading modes; pressurized and suction; for optimized sample transfer and measurement
  • Customer’s unique sample bottles may be used to eliminate the need to transfer samples into special sized test tubes.
  • Emergency samples measured at any time without stopping the Auto Sampler or moving sample vials.

Dnsity Meter - Refractometer - Auto Sampler



All Rudolph Instruments carry our exclusive 20 Commitment to service your instrument.

Rudolph Research Analytical offers a comprehensive range of Preventive Maintenance and Service Programs. Rudolph has demonstrated a commitment to its customers by keeping installed instruments operational, not only for 20 years, but in some cases for over 40 years. This long-term commitment to keeping our instruments running makes the cost of ownership, over the life of a Rudolph Instrument, one of the lowest in the laboratory market segment. At the date this document was published, there is no other laboratory instrument manufacturer guaranteeing service and technical support for 20 years. View the entire 20 Service Guarantee. 


Measurement Ranges Density: 0 to 3 g/cm³ Temperature: 0°C to 95°C (controlled via Peltier) Pressure: 0 to 10 bars
Measurement Modes Continuous, Single, Multiple
Measurement Technique Mechanical Oscillator Method
Accuracy Density: 0.0001 g/cm³ Temperature: 0.05°C
Repeatability Density: 0.00001 g/cm³ Temperature: 0.02°C
Resolution Density: 0.0001 g/cm³ (Extra Resolution Available) Temperature: 0.01°C
Minimum Sample Volume Less than 1 mL
Wetted Materials Borosilicate glass, Teflon (PTFE, ECTFE)
Operating System Software Windows Embedded ® safe from malware and viruses
Display 10.4 inch diagonal TFT type LCD with wide viewing angle, anti-glare flat panel touch screen, 300 nits brightness, 800 x 600 pixels, chemical and scratch resistant monitor, the industry's largest and most flexible interface
Communication Interface Touch Screen User Interface 5 - USB Ports 2 - RS232 Ports Ethernet Port for Network Connection, Keyboard, Bar Code Scanner, Mouse, Network Capabilities
Video Scanning & Magnification Video assisted view of entire cell, capable of approximately 10X magnification with scanning camera
Internal Memory 32GB Non-removable Compact Flash
Operating Dimentions 11.80" (W) 13.90" (H) 18.36" (D) 29.97 cm (W) 35.30 cm (H) 46.61 cm (D) 46cm (L) 28cm (W) 53cm (H)
Shipping Dimensions 24.5" (L) x 17.5" (W) x 22" (H) 62cm (L) x 44cm (W) x 56cm (H)
Shipping Weight 50 lbs. (23 kg)
Power Supply 85 to 260 VAC; 48 to 62 Hz
Power Consumption 140 Watts at peak
Measurement Time 30 - 60 seconds
Origin of Manufacture and Design USA


Density Meter Loading Options

Vertical Load – A Rudolph Exclusive Feature

• Helps with sample injection is done against gravity. Suitable for left and right handed operators as opposed to manual horizontal injection. Plunger is easier to push with all samples and there is more control over the syringe than with Horizontal Load.

• Gives the ability to apply more pressure to the syringe when injecting viscous samples without harming operators.

• Much easier cleaning. When a measurement is complete and the syringe is removed, gravity will force the sample down and into the waste jar. As opposed to the traditional horizontal load, if the waste tubing was bent, the sample would pour backwards and spill out on the table.

• Preserves the nozzles and nozzle bodies much better since there will not be added pressure from pushing on them when loading a sample. All the pressure will be on the top plate, thus saving in future maintenance costs.


• Great option as there is two ways to inject a sample: by manual injection or having the PeriPump pull the syringe for you.

• Ideal for pulling the rinse solutions automatically into the system thus making the rinsing part of the operation much easier.

• Pressure mode available for carbonated samples.

• Has no added benefit to measurement performance over the Horizontal Load for an experienced user. However it benefits customers that have multiple inexperienced users as the PeriPump will automatically inject the sample the same way every time.

• No change in instrument’s performance when compared to HL or VL option.

MM Peri Pump

• Most versatile option. Allows three ways to inject the sample: through the supplied needle, manual injection or having the PeriPump (LA).

• Has no added benefit to measurement performance over the Horizontal Load for an experienced user. However it benefits customers that have multiple inexperienced users as the PeriPump will automatically inject the sample the same way every time.

• An added benefit is the cleaning process, or possible lack of cleaning and going right into your next sample which will decrease operational times.

• Yields same results as a VL or HL or LA for all non-viscous types of samples, so no change in performance occurs.

Syringe Injection

Samples can be easily loaded in the DDM series Density Meter by directly injecting your sample into the inlet port of the DDM. You can watch the sample progress through the U-Tube and monitor for bubbles. Need a closer look? View at 2X, 6X or 10X magnification. When your measurement is complete simply flush the U-Tube with your choice of solvent and use the convenient air tube to dry the U-Tube.

Who Should Use this System?

Laboratories who make only a few measurements per day. Users who wish to use very small amounts of sample – Only 1ml of sample is required.

Peristaltic Pump

Combining a Peristaltic Pump with a Rudolph Density Meter makes sample loading and cleaning faster and more convenient. A Peristaltic Pump draws the sample into the Density Meter and could also load a Refractometer. The user drops a tube into the sample and starts the Peri Pump from the DDM display. The Peristaltic Pump draws the sample through one or two instruments and then measures. The measured sample is displaced to waste by the following sample.

Who Should Use this System?

Laboratories working with low viscosity samples such as beverages.

Users who don’t mind utilizing 50 ml of sample for a measurement. A large amount of sample is needed to ensure all of the previous sample is displaced with the new sample.

AutoFlex R837 Automation System

The DDM Series of density meters can be combined with various Rudolph Automation Systems and Sample Handling Accessories.
Available are Peristaltic Pumping, Heated Sampler, the ECS (Easy Clean System), and the Rudolph R837 AutoFlex Sampler.

The Rudolph Research R837 AutoFlex is perfect for high throughput laboratories
looking to increase productivity.

The R837 AutoFlex Sampler Facilitates:

• Customizable bottle size, Test Tube size, Boston Rounds:1oz, ½ oz, virtually any size

• Customizable Rack configurations: heated and unheated on the same carousel
• Automated sample introduction

• Flexible Method Selection: Suction mode, Pressure mode, Rinse and Dry Duration

• Programmable cleaning and drying

• Automatic solvent and waste level detection

• System Configuration minimal sample volume: 1.5 mL

• A heated interface is available

• Fast throughput.

• Automation saves operator time and increases your lab’s efficiency
• An urgent-sample interruption can be made at any time

Operation is completely automatic. The sample is measured and the data recorded. Depending on how the system is configured the data may also be printed, saved as an Excel file or transferred to a LIMS system

Full Automation

Multiple measurements from one sample, with full automation and automatic cleaning and drying.


Combine instruments with Automation to Measure: Refractive Index, BRIX, Density, Specific Gravity, Optical Rotation, Color, Alcohol % vol/vol, Proof and more all from a single sample.

AutoFlex gives you the most flexibility in sample vial selection, sample handling and instrument combinations.

Ideal for high throughput Flavor, Fragrance, Alcohol, Chemical, Petroleum, Food Labs who run many samples each day and want automatic cleaning of the system.


By measuring Specific Gravity and Refractive Index the alcohol % by vol/vol can be determined for many products. This is a fast, single sample load solution for the Alcopops, Wine and Beer industries. The process of pre-distilling samples to remove the alcohol and adding back distilled water to replace any solids is eliminated. Simply load a sample into the system, the system measures the sample and using the AlcoTest software calculates the alcohol %.

AlcoTest®-RI-J209 is ideal for

 High volume producers of Alcopops products with high solids and/or high sugar based flavorings

 Producers of wine who wish to quickly measure alcohol % by vol/vol

 Producers of beer and other malt beverages

 Distilled Products with Obscuration

For alcohol % by vol/vol the following accuracies apply

better ±0.01 % v/v with DDM 2911 PLUS – TTB Compliant for high proof spirits

better ±0.04 % v/v with DDM 2911

better ±0.07 % v/v with DDM 2910

For obscured products, accuracies will vary by product. Ask for a demonstration or sample study.

Scientific Solutions

Scientific Solutions have been providing carefully selected laboratory and analytical equipment to Australian Industries such as Environmental, Pharmaceutical, Food and Beverage and Research markets of the Science Industry for over a decade.

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