DDM 2911 PLUS Density Meter by Rudolph Research Analytical

The Rudolph DDM 2911 PLUS, Automatic Density Meter is our most capable instrument offering our widest measurement range, highest accuracy, and the on-board range methods and electronic data tracking required in the most demanding laboratories in the world. The DDM 2911 PLUS is highly recommended for high level work in the Pharmaceutical, Chemical, and Petroleum industries.  With 0.00001 g/cm3 accuracy the DDM 2911 PLUS is an excellent choice for the Alcohol Beverage industry to measure alcohol concentration to determine alcohol Proof.

Designed for the most demanding cGLP/GMP Laboratories the DDM 2911 PLUS Density Meter offers density accuracy to 0.00001 g/cm3, Resolution: Density 0.000005 g/cm³, and Temperature Selectable to: 0.001°C

If you work in one of the following industries and need the highest level of accuracy the DDM2911 PLUS is a perfect choice for your laboratory.


Density Meter Wine SpiritsAlcohol Proof Testing – Density Meters for the Alcoholic Beverage Industry

  • The US Alcohol and Tobacco Tax and Trade Bureau (TTB) requires 0.02% Ethanol accuracy for testing of % Ethanol in wine, beer, and spirits for the purposes of taxation and labeling.
  • The DDM 2911 PLUS offers 0.01% accuracy for Ethanol testing.
  • Measure both alcoholic and nonalcoholic beverages with easy bubble detection using VideoView™
  • Direct and accurate means of °Brix determination, °Plato, °Balling, Proof, % Solids


Density Meters for the petroleum industryDENSITY METERS FOR THE PETROLEUM INDUSTRY

  • Measure API, Density and Specific Gravity values in accordance with
    ASTM D1250, ASTM D4052, ASTM, D4806, ASTM D5002, ASTM D5931,
    ISO 12185, and DIN 51757
  • QC incoming raw materials
  • Research new products and additives
  • Withstands harsh and heavy use environments
  • Calibrate using petroleum standards



Density meter for the chemical industryDENSITY METERS FOR THE CHEMICAL INDUSTRY

  • 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.



Density Meters for the pharmacuetical industryDENSITY METERS FOR THE PHARMACEUTICAL INDUSTRY

  • Capable of 2, 3, 4 or more multiple measurements with standard deviation, mean, 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


Density Meter – Flexible Method Management

Factory installed density meter measurement methods allow for immediate selection of the correct method to match the most common applications.

Density Meter - Methods Management Screen

For unique Density Meter 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. Just a few of the many possible customized sample methods shown below:

  • Concentration D2O – Heavy Water
  • Proofing of Ethanol Sample
  • Testing of Aspartame and other artificial sweeteners
  • Monomer Solutions
  • Hydrogen Peroxide
  • Determination of Partial Specific Volume
  • ppm, Normality, Molarity
  • % Toluene in Heptane
  • Mole Fraction of Methanol
  • Purity of sample testing.
  • Density of Gases and Aerosols
  • Potassium Permanganate
  • Sweeteners
  • Ultracentrifugation applications
  • SG of Urine
  • Sodium Hydroxide

Setting up your custom method on your Density Meter is as simple as filling out a few screens like the one below:

Density Meter Methods Screen

Rudolph Density Meters offer VideoView™ Bubble Detection

VideoView provides superior high resolution visual bubble detection within your sample with live on-screen video viewing. The U-Tube may be viewed at 2X, 6X and 10X magnification, for the entire U-tube. The 10X magnification is also extremely helpful in detecting the cleanliness of the glass U-tube. Both images may be saved with sample results and may be viewed and or printed as desired.


A full view of the entire U-tube is possible without any obstruction. Automatic Scanning of U-tube under the 10X magnification of the entire U-tube and manual control is possible to view any position of the U-tube for bubble detection. The clarity, magnification and resolution is the very best available. Rudolph’s exclusive VideoView is protected under Patent #7,437,909.

  • 2X, 6X and 10X magnification U-tube is possible.
  • The entire view of the U-tube is available for both images.
  • Both images are saved and can be viewed, exported and/or printed with measurement results.
  • Automatic Bubble detection is available which will flag the sample(s) with suspected bubble.

Computer Windows Embedded Based Flexibility

  • 32 gigabytes of internal memory allow almost unlimited capacity for saving measurement data. The DDM 2911 PLUS 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 2911 PLUS touch screen. The 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 2911 PLUS internal memory.
  • Copy methods, transfer concentration tables, download data, etc., via the USB ports on the front of unit.
  • Five USB ports allow for quick and easy connection to a mouse, keyboard, printer, bar code scanner, or memory stick.
  • Embedded Windows 7 prevents any and all viruses and malware.

Density Meter - Windows 7 Based Screen

The Rudolph 2911 PLUS Density Meter offers 21CFR Part 11 Instrument Level Compliance

The DDM 2911 PLUS’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

Density Meter 21 CFR Screen

Oscillating U-Tube with Viscosity Correction and Reference Oscillator

(patent # 7,735,353)

The DDM 2911 PLUS 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 2911 PLUS with 2 or 3 NIST Traceable Standards – calibrating with merely air and water appears inconsistent with cGMP/GLP compliance regulations.
  • 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


Versatile Communication Capability

The DDM 2911 PLUS’s standard communication package includes:

  • Ethernet Port for Network Cable Connection
  • 5 USB ports
  • 2 RS 232 Ports
  • Internet Accessible for Firm-Ware updates and remote trouble shooting.

Allowing capability to:

  • Export measurement results to a thumb drive, store it locally on the C:\ drive, or easily send data to any external PC, LIMS, SAP, etc.
  • Print measurement results to a local or networked printer. Most all printers are supported by Windows 7® but if required the driver may be added.
  • Save measurement data direct to your Network/Server

Denisty Meter USB ports Rear


cGMP/GLP Printing

Sample measurement reports are edited quickly and easily. Just import your logo to the DDM 2011 PLUS Density Meter and print your company’s customized “C of A” directly.

Density Meter Certificate

NIST Traceable 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 2911 PLUS standard accessories include:

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

Laboratory Automation with Rudolph Automation Systems

The Rudolph DDM 2911 PLUS Density Meter can be combined with various automation products to speed your sample measurements.

The DDM 2911 PLUS with Rudolph’s AutoFlex R837 Automatic Sampler

The Rudolph Research R837 AutoFlex is a perfect instrument combination for labs where a high
volume of daily samples are required.

The R837 AutoFlex Sampler Facilitates:

  • Flexible bottle size, Test Tube size, Boston Rounds:1oz, ½ oz, virtually any size.
  • Flexible Rack configurations: heated and unheated on the same carousel.
  • Automated sample introduction
  • Flexible Method Selection: Suction mode, Pressure mode, Rinse and Dry Duration.
  • Waste disposal
  • Programmable cleaning and drying
  • Automatic low solvent and waste full level detection.
  • Minimal operator training required: Less than 5 minutes.
  • System Configuration minimal sample volume: 1.5 mL
  • Just place your sample in front of the instrument and press start
  • Each measurement ends with a cleaning cycle so the instrument is always immediately available for the next measurement.
  • A heated interface is available.
  • Fast throughput, 2-5 min complete cycle time.

Automation saves operator time and increases your lab’s efficiency.
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.

Density Meter with Automatic Sampler



The Rudolph ECS (Easy Clean System) is a perfect instrument combination for Alcohol Labs where a high volume of daily samples are required.

The Rudolph ECS System facilitates:

  • Automated Sample introduction
  • Waste Disposal
  • Programmable cleaning and drying.
  • Automatic low solvent and waste full, level detection
  • Minimal operator training required: Less than 5 minutes.
  • System Configuration: Minimal sample volume: 1.5mL
  • Just place your sample in front of the instrument and press START
  • Each instrument ends with a cleaning cycle so the instrument is always immediately available for the next measurement
  • A heated interface is available
  • Fast Throughput, 2-5 min complete cycle time.
  • Automation saves operator time and increases your lab’s efficiency.

Operation is completely automatic. The sample is measured and the data is 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.

Other Automation Systems and Instrument combinations are available. A Rudolph Research Automation specialist can help you configure a system for your application.

Density Meter with Automated 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. 

Density Meter DDM 2911 PLUS – Specifications

DDM 2911 PLUS Density Meter Specifications
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


Density: 0.00001 g/cm³

Temperature: 0.01°C


Density: 0.000002 g/cm³

Temperature Selectable to: 0.001°C


Density: 0.000001 g/cm³

Temperature Selectable to: 0.001°C

Minimum Sample Volume

1 ml, approximately

Wetted Materials

Borosilicate glass, Teflon (PTFE, ECTFE)

Operating System

Software Windows Embedded ® safe from malware and viruses


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)

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