euromex RF.6510 Analog Refractometer User Manual
- June 5, 2024
- euromex
Table of Contents
euromex RF.6510 Analog Refractometer
Introduction
With your purchase of a Euromex hand refractometer you have chosen for a
quality product. The Euromex hand refractometers are developed for use in
laboratories and in the food industry
The maintenance requirement is limited when using the refractometer in a
decent manner
This manual describes the construction of the refractometer, how to use the
refractometer and maintenance of the refractometer
General safety instructions
- This product is a high quality optical instrument. Delicate handling is required
- Impacts, even small ones, can affect the precision of the device
- Keep the device and its optics clean for maximum performance
- Precautious should be taken with the samples; substances under observation may be a risk to the health of humans and other living organisms or the environment
Construction of the refractometer
The names of the parts are listed below and are indicated in the picture above
Functions of the refractometer
The Euromex hand refractometers are widely used for measuring sugar
concentrations, in the table on the next page the different models are shown
with their specific way of calibrating them
Standard accessories
- For all types: carrying case, screwdriver or alien key for scale adjustment, plastic pipette
- For RF 190 only: temperature correction thermometer
- For RF.6190, RF.6562, RF.6582, RF.6592, RF.6642 and RF.6644: testpiece 19,6% or 78,8% and dispersion fluid
Working with the refractometer
Prior to the actual measurement, the scale should be checked if it is correct or not (calibrated). If not, the scale should be adjusted by using the supplied tool to turn the scale adjustment screw (C). For this check, two different standard specimens for each type of hand refractometer are used. These are distilled water and a test-piece, as suggested in the table above
A) Distilled water
Open the prism cover (B). and put a drop of distilled water on the surface of
prism (A). Close the prism cover and peep through the eyepiece (D). You will
see the horizontal demarcation line as well as the scale in the field of view
. If the scale is correctly calibrated the horizontal demarcation line should
be exactly on the 0% position of the scale. If not, one can adjust the scale
with the screwdriver until the demarcation line is at the scale’s 0% position
B) Test-piece
For RF.6190, RF.6562, RF.6582, RF.6592, RF.6642 and RF.6644 a standard test-
piece is included to calibrate the scale . Put a small drop of the supplied
dispersion fluid on the prism and put the testpiece into this drop, close the
cover gently. The value should read 19.6% or 78.8% depending on the model
Light entrance
Usually daylight is good enough for all types of hand refractometers but
depending of the kind of sample, one can also direct the refractometer to a
bright light source
Note: Only for the RF.6190, a special daylight window for opaque specimens is provided. Usually it should be kept closed
Actual measurement
Wipe off the distilled water, or dispersion fluid. Put a few drops of the
specimen on the prism. Close the prism cover and the percentage of the
measurement can be read at the position of the demarcation line
Temperature compensation
All types have an Automatic Temperature Compensation system (ATC), except for
the RF.6190 universal type. With this type, if the temperature at the
measurement is not 20°C but higher or lower, the reading should be compensated
in accordance with the compensating table below. For example, when the reading
is 20 at a temperature of 28°C. the compensated percentage is 20% + 0.62% =
20.62%.
| % | s | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | so | 55 | 60 | 65 | 70 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ·c | (-) reduce figure from theread figure(%) | |||||||||||||
| 15 | 0.29 | 0.31 | 0.33 | 0.34 | 0.34 | 0.35 | 0.36 | 0.37 | 0.37 | 0.38 | 0.39 | 0.39 | ||
| 0.40 | 0.40 | |||||||||||||
| 16 | 0.24 | 0.25 | 0.26 | 0.27 | 0.28 | 0.28 | 0.29 | 0.30 | 0.30 | 0.30 | 0.31 | 0.31 | ||
| 0.32 | 0.32 | |||||||||||||
| 17 | 0.18 | 0.19 | 0.20 | 0.21 | 0.21 | 0.21 | 0.22 | 0.22 | 0.23 | 0.23 | 0.23 | 0.23 | ||
| 0.24 | 0.24 | |||||||||||||
| 19 | 0.06 | 0.06 | O.Ql | 0.07 | 0.07 | 0.07 | 0.08 | 0.08 | 0.08 | 0.08 | 0.08 | |||
| 0.08 | 0.08 | 0.08 |
(+) add figure to the read figure(%)
21| 0.07| 0.07| O.Ql| O.Ql| 0.08| 0.08| 0.08| 0.08| 0.08| 0.08| 0.08|
0.08| 0.08| 0.08
22| 0.13| 0.14| 0.14| 0.15| 0.15| 0.15| 0.15| 0.15| 0.16| 0.16| 0.16| 0.16|
0.16| 0.16
23| 0.20| 0.21| 0.22| 0.22| 0.23| 0.23| 0.23| 0.23| 0.24| 0.24| 0.24| 0.24|
0.24| 0.24
24| 0.27| 0.28| 0.29| 0.30| 0.30| 0.31| 0.31| 0.31| 0.31| 0.31| 0.32| 0.32|
0.32| 0.32
25| 0.35| 0.36| 0.36| 0.38| 0.38| 0.38| 0.40| 0.40| 0.40| 0.40| 0.40| 0.40|
0.40| 0.40
26| 0.42| 0.43| 0.44| 0.45| 0.46| 0.47| 0.48| 0.48| 0.48| 0.48| 0.48| 0.48|
0.48| 0.48
27| a.so| 0.52| 0.53| 0.54| 0.55| 0.55| 0.56| 0.56| 0.56| 0.56| 0.56| 0.56|
0.56| 0.56
28| 0.57| 0.60| 0.61| 0.62| 0.63| 0.63| 0.64| 0.64| 0.64| 0.64| 0.64| 0.64|
0.64| 0.64
29| 0.66| 0.68| 0.69| 0.71| 0.72| 0.72| 0.72| 0.73| 0.73| 0.73| 0.73| 0.73|
0.73| 0.73
30| 0.74| 0.77| 0.78| 0.79| 0.80| 0.80| 0.81| 0.81| 0.81| 0.81| 0.81| 0.81|
0.81| 0.81
Maintenance and cleaning
Always clean the prism of the refractometer after use with a soft tissue
Warning
Cleaning cloths containing plastic fibres can damage the coating of the prism!
Euromex Microscopen bv
- Papenkamp 20
- 6836 BO Arnhem
- The Netherlands T +31 (0) 26 323 22 11
- info@euromex.com
- www.euromex.com
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