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DR101-60
As an entry-level model in digital refractometry, the DR101-60 covers many
areas of application where the wide measurement range of the DR201-95
is not required. It offers excellent value for money, in terms of both procure-
ment and operation. Calibration is also with distilled water.
The waterproof case allows the DR101-60 to be rinsed under running water.
This digital handheld refractometer also has an automatic temperature
compensation feature, of course.
Scale´s unit
ZERO Calibration key
READ key to start measuring
SCALE key to chose the scale´s unit
Function
Power:
The instrument is switched on
by pressing the READ key. At
the same time, the temperature
displays on the LCD.
READ
Measurements: Apply a few drops
of sample on the prism with a
pipette. Press the READ key. Within
1 second, the value is shown on
the LCD display.
Zero-Check: Pressing ZERO key
quickly to perform zero-check
function.
Calibration: Pressing ZERO key
ZERO
to perform a zero calibration. To
Prism cover
eliminate accidental calibrations,
the key must be pressed for
3 seconds.
Active SCALE: The scales can
be switched between Brix and
Refractive Index resp. Refractive
Stainless steel
Index and Oechsle degree by
sample plate
SCALE
pressing the SCALE key until the
desired scale is shown by the scale
indicator at the bottom section of
Prism
the LCD display.
LCD-Display
Calibration:
Keypad
Calibration should be performed on a daily basis for optimum results and
accuracy. For the best results, perform calibration in a controlled environment
of 20°C ( 68°F ) using distilled water of the same temperature. It is recom-
mended to allow the instrument and the distilled water to reach temperature
equilibrium with the controlled environment before calibration takes place.
Apply a few drops of sample on the prism with a pipette. Press the ZERO key
for 3 seconds. When calibration is complete, "CAL" will be shown on the LCD
display. To check the RI value of the zero setting for the distilled water, press
quickly the ZERO key, once. This data can be viewed at any time to show the
last calibration value.
When calibration is complete, gently wipe the prism using tissue paper.
Automatic Temperature Compensation (ATC):
Automatic temperature compensation insure that concentration reading of
aqueous (water-based) solutions will be accurate with respect to the sample's
temperature. This digital refractometer is able to correct automatically for diffe-
rences in the temperature of the sample to a reference temperature, usually
20 °C. It is well known that substantially all materials expend when heated
(become less dense) and contract when cooled (become more dense).
The speed of light in a liquid increases with temperature, and the refractive
index therefore decreases. Although this thermal effect is small for solids,
the change in density for liquids is substantial. For example, the reading for a
sucrose solution will change by approximately 0.5 Brix for each 10 °C (5 °F)
change in temperature. So a 10 Brix solution read at 42 °C (108 °F) would
read 8 Brix on a non-temperature compensated instrument.
DR201-95 and DR201-95OE
Remarks
The DR201-95 is a compact digital handheld refractometer which elimi-
The refractometer will be shut off
nates any user-related reading errors of manual handheld refractometers.
after 30 seconds of non-use.
Specially developed for fast and easy quality control and process control,
When alarm of battery displays
on the LCD, replace with a new
it has a wide measuring range for a refractive index scale and a sugar
battery.
scale. One DR201-95 can thus often replace several existing instruments.
For wine-growing, a special model is available with an Oechsle scale
For the best results,
gently clean and wipe the prism
instead of a sugar scale. Both instruments are low-maintenance and are
with distilled water and tissue
calibrated simply with distilled water. The 1.5 V battery lasts for over
paper.
1000 measurements.
Displays the nD value of the
solution.
DR101-60:
Scale's units for Brix and RI
DR201-95:
Scale's units for Brix and RI
DR201-95OE:
Scale's units for RI and Oechsle
Prism cover
Stainless steel
sample plate
Prism
LCD-Display
Keypad
Scale´s unit
READ key to start measuring
SCALE key to chose the scale´s unit
ZERO Calibration key
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