Using A Refractometer - Aqua-Hot 400 series User & Care Manual

Eyepiece
Use extreme caution in gathering your antifreeze sample.
When draining the Aqua-Hot heating system, extremely hot
liquid may be in the boiler tank and could cause personal
injury.
Step 1:
Open daylight plate, and place 2 to 3
drops of the sample on the main
prism. Close the daylight plate so the
liquid sample spreads across the en-
tire surface of the prism without air
bubble 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 refrac-
tometer).
Using the Refractometer to Test Antifreeze Sample
Aqua-Hot Part Number MSX-907-162
Basic Operation
Step 2:
Hold daylight plate in the direction of a light
source and look into the eye piece. You will
see a circular field with graduations down
the center (you may have to focus the eye-
piece to clearly see the graduations). The
upper portion of the field should be blue,
while the lower portion should be white.
Calibration Screw
Main Prism
Assembly
NOTE: Refractometers may have more than one
scale. Make sure you are reading the scale
marked "Propylene" for measuring the antifreeze
solution in the Aqua-Hot System.
Step 3:
Take the reading where the boundary
line of the blue and white cross the
graduate scale. The scale will provide a
reading of the freezing point of anti-
freeze solution and the propylene gly-
col concentration. Clean the prism
carefully using a damp soft cloth. Do
NOT immerse in water.
400-D Use & Care Guide
© Aqua-Hot®
Section #: Title
Care & Maintenance
Daylight Plate
Assembly
p.
14