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Operation Manual
Technical facts:
RHA-200/ATC
Remark: E=Ethylene glykol; P=Propylene glykol; B=battery fluid
Method of operation:
1) Aim the front end of the refractometer to the direction of bright light, and adjust the eyepiece until the reticle
can be seen clearly
2) Adjustment of null:
Open the daylight plate and place 2-3 drops of distilled water on the main prism. Close the daylight plate and
press it lightly, so the water spreads across the entire surface of the prism without air bubbles or dry spots.
Allow the sample to remain on the prism for approximately 30 seconds. Then adjust the calibration screw
until the light/dark boundary coincides with the null line. Adjustment of refractometer with temperature com-
pensation function should be made under the condition of 20°C environmental temperature. When working
temperature of the room or environment (not the sample) changes by more than -15°C, we recommend
recalibration to maintain accuracy.
3) Operation procedure is done after calibration and it is done in essentially the same manner as calibration.
Open the daylight plate. Clean the surface of prism by soft cotton cloth. Drop 2-3 drops of solution to be mea-
sured on the main prism. Close the daylight plate and press it lightly, then read the corresponding scale of
light/dark boundary.
4) After measurement, clean away the measured solution on the surface of prism and cover plate by moist
cotton cloth.
Maintenance:
1) Adjustment of null: liquid and specimen should be under the same temperature. If the temperature varies
greatly, the null point should be adjusted once per 30 minutes.
2) Don't use water to wash the instrument, so as to prevent water from entering into the instrument.
3) As it is a kind of precision optical instrument, you should handle it gently and take good care of it. Don't touch
and scratch the optical surfaces. It should be kept in the environment of dry, clean and non-corrosive air, so
as to prevent the surface of it from turning mouldy and foggy. Please avoid strong shock during transporta-
tion.
Range
E: -60°C – 0°C
P: -50°C – 0°C
B: 1.100 – 1.400sg
MIn. Divergence
5°C
5°C
0.01sg
Daylight Plate
Calibration Screw
Focus Adjustment
Eyepiece
Refraktometer
Accuracy
±5°C
±5°C
±0.02sg
3
Solarbayer GmbH
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