Technical Specifications

A versatile, easy to use range of liquid and solid reference standards for checking the calibration of all types of manual, semi-automatic and full automatic refractometers.

Build confidence into your routine laboratory or quality control procedures by regularly checking the calibration using a convenient liquid or solid reference material from our 'Standard' or 'Supplied to Order' ranges.

Ideal for all applications
These reference calibration standards will appeal to Analysts and Quality Control Managers in any industry who need a quick, reliable method for checking the calibration of their refractometers.

Typical applications include:

• Soft Drinks
  
• Food Processing
• Fine Chemical Manufacture
  
• Cosmetics
• Adhesives
  
• Mineral Oil Processing
• Vegetable Oil Processing
  

Liquid Reference Standards

• Available as singe standards or in sets to suit your analytical needs
  
• Standard range, choice of reference liquid volumes: 7ml or 500ml (4 x 125ml).

'Supplied to Order' Standards
Available in any value from 1.300RI to 1.395 RI in 0.005 RI increments, from 1.400 RI to 1.700 RI in increments of 0.002 RI and from 1.7050 RI to 1.800 RI in 0.005 RI increments. Supplied with certificate of traceability to NIST standards.

Long Life
Fluids from the above ranges vary from very stable to slightly volatile, depending on the RI value. With careful handling and storing they will last for a period of years.

H A Range
Designed especially for industries such as soft drinks industry, these bulk 500ml (4 x 125ml sealed bottles) volume reference standards are ideal for use in automatic refractometers having pumped sampling systems. Values are given in Brix units (the most common measurement scale used in this industry) and also in Zeiss units.

'Supplied to Order' H A Reference Standards
Any value from 0 to 15.0 Brix can be supplied in the 4 x 125ml sealed packing to order

Temperature Control
When using these calibration standards, accurate readings can only be obtained if the temperature at which the reading is taken is carefully controlled. The refractometer should always be connected to a circulating temperature controlled bath of sufficient accuracy and the instrument must be allowed to come to a constant temperature before a reading is taken. If however, the instrument has temperature control by Peltier Cell then there is no need for an external water bath.

Accuracy
Published data gives accuracy to at least the 5th decimal place to RI. Achievable accuracy will depend upon the specification of the refractometer being checked.

Supplied as 10mm dia. X 5mm thick (approx.) discs for easy handling. Full details and procedures for the use of solid test pieces are provided with the test pieces together with recommendations of which contact fluids are suitable for each application.

This size is ideal for use with the Index Instruments full range of automatic refractometers. Other sizes can be provided on request.

All standard test pieces are supplied with a statement of refractive index.

Glass solid test pieces are available in many different values to order, the accuracy will however, depend on the material.

Health and Safety
Appropriate safety precautions and equipment should be observed when handling liquid calibration standards and contact fluids used with solid calibration standards. If in doubt, consult your safety representative or officer before handling.

General
Since the conditions of use are beyond our control, the value of the reference solution is warranted only if the bottle seal is not broken.

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UKAS Certification!

Supplied in 7ml sealed glass bottles. Individually labeled with value, accuracy and thermal coefficient or refractive index. Supplied with certificate of traceability to NIST (USA National Institute of Standards Technology).   Master Range Refractive Index (RI) Accuracy 1.4020 at 20°C ± 0.00005 1.4900 at 20°C ± 0.00005 1.6300 at 25°C ± 0.00005 Standard Range RI at 25°C Brix at 25°C (approx.) Accuracy 1.3500 12.0 ± 0.0002 RI 1.3700 25.0 ± 0.0002 RI 1.4200 50.0 ± 0.0002 RI   H A Range Brix at 20°C Zeiss at 20°C Accuracy 9.5 51.8 ± 0.016 Brix (± 0.08 Zeiss) 12.0 61.9 ± 0.016 Brix (± 0.08 Zeiss)   Solid Reference Standards Lithium Fluoride 1.3921 RI at 20°C Calcium Fluoride 1.4339 RI at 20°C Silica 1.4584 RI at 20°C

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