Automatic Density Meter

The Rudolph DDM 2911 Plus / 2911 / 2910 / 2909 Density Meters have the features to meet all the present day industrial needs.

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Digital Refractometer

Rudolph have a large bouquet of various models of Refractometers to choose from. It varies depending on the application, the RI range, accuracy, budget among others.

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Digital Polarimeters

Rudolph manufactures various models of Polarimeters depending on accuracy, resolution, application, Temperature maintenance and budget. They vary from Autopol I to Autopol VI

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AUTOPOL VI Automatic Polarimeter

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Portable Brix Meter

KEM, Japan Brixmeter model BX-1 is an automatic, digital system with an LCD display. The range is continuous between 0 – 85%Brix. The resolution is 0.1%Brix. This system is equipped with temperature compensation and has an IP-65 protection. This means that the system can be washed under the tap directly for cleaning the previous sample.

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Portable DensityMeter

The KEM, Japan portable Densitymeter model DA-130N is a microprocessor controlled system with an LCD display. It operates out of the ASTM approved "oscillation of the U-tube" method. It displays Density, Temperature-compensated Density, Specific Gravity, Temperature-compensated Specific Gravity, Brix%, Alcohol Concentration, Sulfuric Acid Concentration, API degree, Baume degree, Plato degree, Proof degree etc.

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Portable Refractometer

KEM, Japan portable Refractometer model RA130 is a light-weight, easy-to-use and a handy system. It is a microprocessor controlled instrument with an LCD display. The sample can either be dripped on the prism or the prism of the system can also be dipped into the sample beaker to measure RI. Since the system is IP-65 protected the system can be directly immersed into the sample beaker also.

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Texture Analyser

Shimadzu Texture Analyser is ideal and effective for testing Food (Texture Profile Analysis), Pharmaceutical Substances, Packaging materials, Medical Devices etc.. It can be fixed with a variety of jigs and fixtures. For the Food Industries many parameters including Hardness, Brittleness, Adhesiveness, Cohesiveness, Elasticity, Rubberness, Chewability etc. can be obtained from the user friendly software Trapezium X Texture

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Shimadzu Universal Testing Machine helps you to determine Tensile strength , Shear Test , Elongation Test for various materials which includes metals , plastics , rubber , wires etc .

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Contact Angle Meter

Kyowa Contact Angle Meter can perform Sessile Drop Method, Extension/Contraction method, Surface / Interfacial tension of liquids with Pendant drop method, Sliding Method & Dynamic Sliding Method. Model DMe-701 is the most automatic model and even stage movement and Droplet deposition are controlled through the PC. Right from the basest of models right upto Model DMe-701 are available depending on the application, capabilities, budget etc..

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Surface Tensiometer

Surface Tensiometers are widely used to check Surface Tension of Paints , Inks , Additives , Surfactant etc & same instrument is also used for the measurement of IFT - INTERFACIAL TENSION. The Interfacial Tension is mostly used in the study of quality of Transformer Oil.

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Refractometer Calibration Standards

Rudolph Research Analytical works with Cargille Laboratories to provide a range of refractometer calibration standards.

All Calibration standards are:

  • Supplied in 28ml bottles
  • Supplied with a calibration certificate traceable to the National Institute of Standards and Technology (NIST)
  • Shelf life of unopened bottle is 5years
  • Shelf life of opened bottle is 2.5 years
  • Fluids calibrate at temperatures between 20°C and 40°C are accurate to 0.0001 Refractive index
  • Fluids calibrate at temperatures above 40°C are accurate to 0.0005 Refractive index
  • Some fluids available with calculated Brix values
  • Some fluids available with calculated Urine Specific gravity numbers

Choosing a Refractometer Calibration Fluid

Rudolph Research Analytical offers two types of calibration fluids:

  • NIST traceable refractive index fluids
  • Brix standards made from sugar and water

This article is designed to serve as a guide as to which fluid will suit the application best.

Technical Considerations

   Refractive Index Fluids  Brix Fluids     Advantages
Description of Fluids Refractive index fluids are made from chemical compounds such as methylene iodide, silicon oil and alpha bromonapthalene. These chemicals are chosen as they are non toxic though some of the fluids do have an unpleasant odor (alpha bromonapthalene = mothballs). Brix fluids are a mixture of sucrose and water. Brix fluids
They are so safe you could drink them. They are just sugar and water.
Traceability of Fluids Refractive index fluids are provided with a certificate showing traceability to a national standards body - NIST. Brix fluids are made using the method specified in ICUMSA and are provided with a non-traceable certificate of analysis. Refractive Index fluids
NIST traceability is the ultimate US standard.
Shelf Life    Refractive index fluids have a rated life of 5 years unopened, 2.5 years opened. Care should be taken that they are not frozen, but otherwise they can be stored at room temperature

Brix fluids have a life of 30 days and must be kept refrigerated.

Refractive Index fluids
Stored at room temperature for 2 years.
Clean Up After calibration with the refractive index fluids the refractometer must be cleaned with an organic solvent such as acetone. After calibration with the Brix fluids the refractometer can be cleaned with water. Brix fluids
No toxic solvents needed
Range Refractive index fluids are available over the full range from 1.30 - 1.70 Refractive Index and 0 - 95 Brix. Brix fluids are available over the range 0 - 67.5 Brix. Refractive Index fluids Wider range of calibration options
Temperature Dependency All fluids are temperature dependant. The refractive index fluids have a different temperature dependency than the temperature compensation setting on a refractometer and so can only be used on a temperature CONTROLLED refractometer. Brix fluids have the same dependency as a temperature compensated refractometer and so can be used on any instrument. Brix fluids
They can be used to calibrate hand refractometers as well as bench models.

Application Considerations

   Refractive Index Fluids  Brix Fluids     Advantages
Type of refractometer Temperature controlled Refractometer is required. If the refractometer does not have a method of controlling temperature then the refractive index fluids will not work. This applies to all hand refractometers and also Abbe refractometers that do not have a water bath attached. It also applies to a few cheaper bench refractometers. For these refractometers the only choice is the Brix fluids. Brix fluids
They can be used to calibrate hand refractometers as well as bench models.
 Ease of Use  The refractive index fluids are supplied in a glass bottle with a glass dropper stick. The fluids last a long time (2.5 years minimum) but care must be taken to ensure the bottle is not contaminated. In general we would recommend that use of these fluids is restricted to users with some laboratory training. The Brix fluids are supplied in a dropper bottle and are more regularly replaced. This means they are much simpler to use for non-lab trained people. Brix fluids
Dropper bottles are easier to use than pouring down a glass stick
Temperature Range  If the laboratory procedures specify measurement be controlled to a temperature other than 20°C then refractive index fluids calibrated at that temperature must be used.  Brix is, by definition, calculated at 20°C.  Refractive Index fluids
If the instrument is to be calibrated at a temperature other than 20ºC then refractive index fluids are the only choice.

Very General Shortcut- Use Like for Like

Use a fluid that is like the sample to be measured

  • If the results are reported in Brix then use Brix standards
  • If the results are reported in Refractive Index then use Refractive Index standards.

Products and Accessories

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Why Agaram?

  • Instruments only from world-renowned manufacturers
  • Efficient after-sales service
  • Strong presence throughout India
  • Round the clock support via email and phone
  • Readily available instrument demonstration at a location of your choice

Demo Requisition


Seeing is Believing

Email us your details and we shall conduct a demo of our system at your facility.

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