Atago 3930 DD-7 Digital Differential Bench-Top Refractometer using Differential Optical Refraction

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  • £14000.00
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The Ultimate Answer

For Monitoring

Low-Concentration Liquids


Digital Differential Refractometer DD-7

This model measures solutions of low concentration up to 2% at an extremely high accuracy level of ±0.005%. It is recommended for such samples as unsweetened tea and surfactants.2 types of solutions – distilled water as the standard solution and the sample liquid to be measured – are injected into the instrument with syringes. By using a standard solution other than distilled water, solutions of higher concentration can also be measured.  

The DD-7 measures solutions of uThe DD-7 measures solutions of up to 2% Brix concentration at thep to 2% Brix concentration at the  extremely high-aextremely high-accuracy level of ccuracy level of ±0.005%0.005% Brix. 

  • Measurement is very simple. Inject a reference solution and a sample solution to respective injection ports, and press the Start Switch
  • Digital readings eliminate reading errors resulting from user subjectivity.
  • Measurement data can be exported to a printer or computer via RS-232C connection.
Measure low-concentration food and beverages, such as coffee, tea, diet sodas, and herbal extracts.
Measure concentrations of sanitizers and disinfectants, such as hydrogen peroxide solutions, at a precision level of ±0.012% or higher.
Measure surfactants, anti-rust agents, metal-working fluids, and other industrial solutions at ±0.005% Brix accuracy.


Model DD-7
Cat.No. 3930
Scale Brix
Method of measurement Differential optical refraction
Measurement Range 0.000 to 2.000% in concentration (for sucrose solution)
It is possible to measure samples with refractive index up to 1.50 (nD) by reference solution. (Samples must be low in viscosity.)
Resolution Brix : 0.001%
Measurement Accuracy Brix : ±0.005 (In the case of measurement of sucrose solution (0 to 2%) at 30°C)
Temperature control range Between 5°C and 10°C above ambient temperature; up to 40°C
*Heating only (no cooling)
Ambient Temperature 10 to 30°C
Power Supply AC100V to 240V, 50/60Hz
Dimensions & Weight 36×35×14cm, 6.2kg
(Main Unit only)
Power consumption 50VA
Output terminals • Digital Printer DP-63 or DP-AD (Optional)
• RS-232C



  • 0.25% Sucrose (±0.005%) : RE-11025D
  • 0.50% Sucrose (±0.005%) : RE-11050D
  • 1.00% Sucrose (±0.005%) : RE-11100D
  • Low concentration Optional Sucrose Solutions below 2.000% (±0.005%) : RE-172030


  • Printer paper (regular) for Thermal printer : RE-8412
  • Printer paper (long-term storage) for Thermal printer : RE-8414
  • Printer paper for Dot matrix printer : RE-89403
  • Ribbon cassette : RE-89402
    • SKU
    • Commodity Codes
  • Manufacturer
    Atago Co Ltd
  • Country of Origin