Automatic Lab Refractometers 0-95% Brix

• Durable accurate instrument for daily use - quick readout - easy to use
• Accurate and repeatable measurements independent of the operator
• Fully Automatic - simply load a small sample and press one button.
• Digital readout of refractive index, Brix and sample temperature.
• Temperature compensated Brix readings for samples from 15 to 40 Degs C.
• Only a small volume (0.3ml) sample needed.
• RS232 data port.
• Built in diagnostics.

Introduction to automatic refractometers
The ATR series refractometers from Schmidt + Haensch are microprocessor controlled, critical angle Refractometers for measuring the optical density of a wide range of liquid media from low to high viscosity, and independent of opacity and color. The ATR instrument are available in a variety of configurations for laboratory and production quality control. All the units feature diode array detectors, stainless steel and PTFE sample holders and waterproof membrane control panel. These are high quality instruments designed for a long life and constant service. Excellent value

Refractometry and Concentration
Refractometers are widely used to measure the amount of dissolved substances in solutions containing mainly sucrose. The relationship between refractive index and the amount of dry substance content is well known for sucrose and is the basis of the Brix scale which is measure of the number of grams of sucrose present per 100 grams of aqueous sugar solution. (50 Brix means 50 grams of solid per 100 gm of solution) This relationship holds for a large number of similar substances and so the Brix scale is widely used in the food industry. Unfortunately the refractive index of a sugar solution changes with temperature while its solid content remains the same. ( The same refractive index at different temperatures correspond to different Brix values.) Manual "Abbe" Refractometers do not compensate for this temperature effect and manual correction tables should be used to adjust the readings to a standard temperature.

The Schmidt and Haensch range of automatic Refractometers supplied by Topac measure both the refractive index and the temperature of the sample in order to evaluate the Brix value. They read out both the actual refractive index and the actual sample temperature, but they automatically correct the Brix value to what it would be at 20 degs C. regardless of the actual sample temperature. ( In the range 15 - 40 C)
The instruments come in a variety of configurations to meet the needs of laboratory , QC, research and production applications.

The ATR C instrument (pictured above left) incorporates the sample holder into the same case as the electronic console. The sample (0.3ml) is easily placed in the funnel shaped sample well which is easily removed for cleaning. Brix reading are automatically compensated to 20 deg C. in the temperature range +15 - +40 degs C.

The ATR-E (above right ) is an economy version of the ATR-C . It is designed for routine daily use for Brix measurements with an accuracy of 0.1 Brix with a fixed sample holder.