Automatic Lab Refractometers 0-95% Brix

• Measurement of liquids from low to high viscosity
• Irrespective of opacity and colour
• 0.3 ml sample volume is suffi cient
• Teflon sample room for aggressive samples
• Date and time function
• 4 user-defi ned scales programmable

Introduction to automatic refractometers
The ATR ST 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-ST instruments 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 10 - 40 C)
The instruments come in a variety of configurations to meet the needs of laboratory , QC, research and production applications.

The new ATR-ST is an automatic critical-angle refractometer for the measurement of liquid media indepent of their viscosity, colour and transparency to be used in the quality control of productions and laboratories. The ATR-ST, equipped with a detachable funnel, replaces the ATR E and -C and offers an additional range of possibilities. The newly designed casing offers more space for a bigger LCD display and a splash proofed foil keyboard. Batch numbers can be entered directly and also simple forms may be created and printed out. 4 special scales, one of them being programmed as Bx scale and one of them as a grease scale according to Leithe by the factory, allow various applications in production and laboratory. The software of the ATR-ST, designed close to the practice makes it possible to take the mean value and to determine standard derivation and adjustable measuring delay for special measurements in dependence of the temperature. All functions may also be controlled via PC using the remote control program.