Aqua-Hot 375-LP Installation Manual download pdf (Page 53)

375-LP Installation Manual

Warning

Use extreme caution in gathering your antifreeze sample. When draining the Aqua-Hot heating system. ex-

tremely hot liquid may be in the Boiler Tank and could cause personal injury.

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.

Basic Operation

1. Open daylight plate, and place 2

-3 drops of the sample on the

main prism. Close the daylight

plate so the liquid sample 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 eye-

piece. You will see a circular field with

graduations down the center (you may

have to focus the eyepiece to clearly see

the graduations). The upper portion of

the filed should be blue, while the lower

portion should be white.

3. Take the reading where the

boundary line of blue and white

cross the graduated scale. The

scale will provide a reading of the

freezing point of antifreeze solu-

tion and the propylene glycol con-

centration. Clean the prism care-

fully using a damp soft cloth. Do

NOT immerse in water.

USING THE REFRACTOMETER TO TEST ANTIFREEZE SAMPLE

APPENDIX F: MEASURING PROPYLENE GLYCOL USING A REFRACTOMETER

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Aqua-Hot 375-LP Installation Manual Page 53