High Resolution Automatic Lab Refractometers
ATR-SW Series

The ATR SW series Refractometers are microprocessor controlled, high resolution 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. 

Features of ATR-SW Automatic Refractometers

  • Measurement of liquids from low to high viscosity
  • Irrespective of opacity and colour
  • Electronic and measuring devices separate
  • Single and continuous measurements
  • Different sample room doors
  • Date and time function
  • 10 user-defined scales programmable

Introduction to Automatic Digital Refractometers

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 gms of solution) This relationship holds for a large number of similar substances and so the Brix scale is widely used in the food industry. 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 are used to adjust the readings to a standard temperature.

The ATR-SW is a laboratory refractometer for single and flow through measurements. This automatic microprocessor controlled critical angle refractometer is designed to measure the refractive index of liquid media independent of opacity, viscosity and colour. It consists of separate electronic and measuring devices to enable single and continuous measurements. The prism is illuminated by a 589 nm LED and the angle of total reflection is detected by a diode array which guarantees high resolution and stability.

The new housing offers more space for a bigger LCD display and an alphanumeric keypad. Batch numbers can be entered directly and also simple forms can be created and printed out. The scale key offers two scales; refractive index and %Brix temperature corrected within +10 to +50 °C range.

NEW: Serial to Ethernet converter for data transfer to PC

In the refractometer ATR SW series are two different models, they have other parameter for the measuring range, the resolution and the precision. Please see table "Technical details". Different sample room doors with and without water circulation facilities for manual or automatic sample changing complete the versatility.

Example application scenario: A company processing citrus fruits and wants to control the production by taking samples regularly. A Refractometer is needed for the fast measure- ment of similar samples with a high precision of <± 0.02 Brix.

Advantages: The ATR SW is an instrument which allows a very high throughput of samples with high precision. The sample room is designed to flush out the previous sample completely. No intermediate cleaning of the prism is needed. The programming of up to 10 scales allows the direct read out of concentrations of different products. In addition a separate thermostat can be attached. The high thermal mass of the sample room will lead to a fast temperature adaptation of the sample.

Applications of refractometers include:
Chemicals Solvents, organic polymers, distilled products, solutions of inorganic compounds, pesticides, suds
Agriculture Ripeness of fruits, vegetables, beet and sugar cane.
Food Industry Yogurt, jam, fruit extract, syrup, honey coffee extract, vegetable albumen, chocolate, milk, baby food.
Beverage Industry Soft drinks, fruit juice, wine, beer,
Medical Serum, blood, urine
Pharmaceutical Essences, essential oils, aromas.
Petrochemicals Oils, fats, waxes, naphthalenes, raw oils, varnishes, paints

Specifications for ATR Automatic Refractometers

Measuring range: 1.33200-1.53200RI / 0-95% Brix
Resolution: 0.00002RI / 0.02% Brix
Precision: +-0.00004RI / +-0.04% Brix
Working temperature: +5 to +50°C
Temperature compensation Brix: in the range of +5 to + 50°C
Light source: 589nm LED
Display: Illuminated 16 characters LCD
Prism: Saphire, thermostatable
Data output: RS232 C and parallel interface, USB adapter optinonal
Dimensions: Electronic device 185x360x165mm, Measuring device 160x195x155mm
Weight: 8kg (complete unit)
ATR SW plus Differences
Measuring range: 1.30000-1.55000RI / 0-100 Brix
Resolution: 0.00001 RI / 0,01% Brix
Precision: +-0.00002 RI / +-0,02% Brix

Ordering Information

Model Description Part No Price USD
ATRSW Automatic refractometer 0.02 Brix resolution. Electronics console and measuring unit, and instructions T05740 call
ATR-SW Plus resolution 0.00001 RI / 0,01% Brix T05804 call

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