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 D1250, ASTM D4052, ASTM D5002DIN 51757ISO 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. 

Density Meter DDM 2910 – Specifications

DDM 2910 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: 0.0001 g/cm³

Temperature: 0.05°C


Density: 0.00001 g/cm³

Temperature: 0.02°C


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


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