Westover RHB-18 Operation Manual

Operation Manual
for Westover Model RHB-18
Daylight Plate
Main Prism
Assembly
Calibration Procedure
Poor Poor Good
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)
Ô
Hand Held Brix Refractometer
Range: 0-18°
Minimum Division: 0.2°
Accuracy: 0.1°
Dimensions: 27 x 40 160mm
Weight: 176 grams
Parts Diagram
Calibration
Screw
Rubber
Grip
As seen when looking
into the instrument
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.
Focus
Adjustment
Eyepiece
18
16
.
.
.
4
2
0
Lower White Field
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.
Upper Blue Field
18
16
.
.
.
4
2
0
Boundary Line
adjust to here