Atago DD-7 Digital Differential Refractometer (Cat. No: 3930)

The Atago DD-7 is a differential optical refractive index instrument designed to operate in the ultra-low concentration range (0.000-2.000 Brix) where standard refractometers lack adequate sensitivity. By employing a dual syringe system that measures the difference between reference solution and sample, it produces more precise and stable results compared to conventional single-reference instruments.

The device is preferred for applications with minimal concentration variation, such as low-sugar beverages (e.g., sugar-free tea) and dilute surfactant/detergent solutions. With 0.001% Brix resolution and ±0.005% accuracy, it provides significant sensitivity advantage in these measurement applications.

Measurement temperature operates within the 15-40°C range; however, the instrument lacks automatic temperature compensation, so temperature control prior to measurement is essential. IP65 protection rating is not available, therefore careful use is required in environments with chemical splash and moisture risk.

For laboratories seeking a dedicated differential measurement system rather than a standard refractometer for low concentration analysis, the DD-7 provides a practical solution.

Technical Specifications

Applications

• Sugar-free and low-sugar beverage analysis
• Low-concentration surfactant and detergent solution analysis
• Precision Brix measurement of dilute sucrose solutions