Advertisement
Quick Links
Temperature Correction
Model NDX-1 is factory-calibrated to conduct readings at 20°C. For the best accuracy, if
ambient temperature falls above or below 20°C, temperature correction values should be ap-
plied to readings. When a reading is taken under these circumstances, note the temperature
value from the thermometer mounted on the side of the refractometer and follow the procedure
listed below.
Temperature coefficients are used to correct measured values conducted at temperatures other than the reference
(calibration) temperature. For each °C higher than the reference temperature, a temperature coefficient is subtracted from
the value; for each °C lower than the reference temperature, a temperature coefficient is added to the value. Model NDX-1
can be used for measuring both water-based solutions and oils. The coefficients used for temperature correction on oil-based
solutions are slightly higher than those used for water-based solutions (see upper right corner). If there is a specific temperature
coefficient known for the sample being tested, use this value. Otherwise use an average of the values shown in the upper right
corner. Confirm the type of sample being tested and perform the following calculations:
Specifications
Range:
1.3330-1.5170 nD (Refractive Index)
Resolution:
0.0005
Accuracy:
±0.0005
Dimensions:
35 x 35 x 200mm (1.4 x 1.4 x 7.9")
Weight:
650g (22.9 oz.)
Supplied With:
Vinyl Carrying Case (1), Plastic Transfer Pipet (1)
Printed in the USA
Temperature Coefficients
Water-Based Solutions:
(-0.0001 to -0.0002/+°C)
Oil-Based Solutions:
(-0.0003 to -0.0004/+°C)
Common Oils
No. OM122006RFNDX-1-A
Operation Manual
Model NDX-1
1.3330-1.5170 nD
Cat. No. 43053
Advertisement
Summary of Contents for VEE GEE NDX-1
- Page 1 (calibration) temperature. For each °C higher than the reference temperature, a temperature coefficient is subtracted from the value; for each °C lower than the reference temperature, a temperature coefficient is added to the value. Model NDX-1 can be used for measuring both water-based solutions and oils. The coefficients used for temperature correction on oil-based solutions are slightly higher than those used for water-based solutions (see upper right corner).
- Page 2 Introduction General Use Thank you for purchasing this VEE GEE Refractometer. With the user in mind, VEE GEE Refractometers are built from modern Open the secondary prism and apply one or two drops of the sample solution to the surface of the primary prism. Hold the refractometer at an angle close to designs and, with proper care, this instrument should provide many years of reliable performance.