Operation Manual
for Westover Model RHB-18
Ô
1)
Open daylight plate, and place
2-3 drops of distilled water on
the main prism. Close the
daylight plate so the water
spreads across the entire
surface of the prism without air
bubbles or dry spots. Allow the
sample to rest on the prism for
approximately 30 seconds
before going to step #2. (This
allows the sample to adjust to
the ambient temperature of
the refractometer)
2)
Hold daylight plate in the
direction of a light source and
look into the eyepiece. You
will see a circular field with
graduations down the center
(you may have to focus the
eyepiece to see the
graduations clearly). The
upper portion of the field
should be blue, while the
lower portion should be white.
Poor
Poor Good
18
16
.
.
.
4
2
0
18
16
.
.
.
4
2
0
3)
While looking into the eyepiece,
turn the Calibration Screw until
the boundary between the
upper blue field and the lower
white field meet exactly on the
0.0°. Once complete, the
instrument is calibrated for
your current ambient room
temperature. When working
temperature of the room or
environment (not the sample)
changes by more than 5°F,
we recommend recalibrating
to maintain accuracy and
reproducibility.
As seen when looking
into the instrument
Upper Blue Field
Lower White Field
Boundary Line
adjust to here
Calibration Procedure
Parts Diagram
Daylight Plate
Calibration
Screw
Focus
Adjustment
Main Prism
Assembly
Rubber
Grip
Eyepiece
Hand Held Brix Refractometer
Range:
0-18°
Minimum Division:
0.2°
Accuracy:
0.1°
Dimensions:
27 x 40 160mm
Weight:
176 grams
