Refractometers

Short measuring times at maximum accuracy.

We offer series DR6000 Digital Refractometers for the Laboratory, for applications such as mixing-ratio, quality and quantity control, plus determination of purity.

Features & Benefits:
• With a simple, intuitive touch screen all results and user management can be operated on the device. The unit incorporates an integrated SQL database, for storing data, and allows for access via a network or standalone PC.

• The DR6000 has an integrated Peltier thermostat for efficient temperature control, allowing very short measuring times at maximum accuracy.

• Easy cleaning of the probe.

• Complies with all GLP requirements.

Four standard models are available in this series, varying according to range, resolution and accuracy.

How does a Digital Refractometer work?

The measurement of refractive index, also called the index of refraction, is a straightforward process when using modern instruments. Nevertheless the generation of accurate and reproducible results demands that appropriate techniques are used and laboratory technicians are adequately trained.

One major advantage of a modern digital refractometer is that sample preparation is no longer necessary. Liquid samples can simply be placed on the measuring prism and the analysis begun. Good practice requires that the calibration of the instrument is regularly checked, and this can be done by simply measuring the refractive index of a sample of distilled water.

One factor that must be considered is temperature: the refractive index of a substance varies with temperature, and so this must be carefully controlled. A digital refractometer will either incorporate a Peltier temperature control element or, in the case of less advanced instruments, a water bath controlled by thermostat.

Digital Handheld Refractometers

Robust, everyday handheld refractometers for the laboratory

Kruess offers three models in its DR series of Digital Hand-held Refractometers. The DR301-95 is the largest in this range; it is robust and suitable for everyday usage. Easily connected to a PC, allowing for measurements to be saved and evaluated at a later date, it incorporates the refractive index, sugar and salt scales, with the option to add two other user-defined scales. The DR301-95 offers more flexibility than most hand-held devices – it can be easily calibrated, and has an optional temperature compensation feature. Add from the range of accessories the 9V power supply, and it transforms into a small mobile laboratory refractometer.

The smaller DR201-95 is a compact digital handheld refractometer, easy to handle, precise, and fast. Ideal for on-site quality and process control. It has a wide refractive index scale range and a sugar scale. One DR201-95 can often replace several existing instruments. For wine-growing, a special version is available with an Oechsle scale, instead of a sugar scale. Ergonomically designed, the DR201-95 comes complete with a belt pouch.

The DR101-65 is a sturdy, entry level device with an excellent cost/performance ratio, it features the same easy handling and fast measuring results as the two other digital handheld refractometers in this series. It also includes automatic temperature compensation, and is ideal when a wide measurement range is not required.

What are the advantages of digital refractometry?

Digital refractometers offer multiple advantages, being faster, cleaner, and more accurate than traditional manual instruments. The time-consuming sample preparation and clean-up stages of an Abbe refractometer are dispensed with entirely, and the liquid sample is simply placed on the measuring prism and the analysis begun.
The control of temperature is a vital aspect of any refractometry, as the refractive index of a material will vary considerably with temperature. Digital refractometers may be equipped with electronic temperature control through an accurate Peltier heating/cooling element, again eliminating a time consuming operation and increasing the accuracy and reliability of the measurements.

Digital instruments also offer substantially greater accuracy than manual devices, having resolutions to five decimal places, and can be integrated into wider laboratory or process management operations through the digital electronic output they provide.

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