VISGAGE - A POCKET VISCOSITY COMPARATOR

Model #2 and Model #4 Operating Instructions

PAGE 2

CAUTION: Do not draw hot oils directly from a crankcase or reservoir into the VISGAGE.

Place a small quantity of oil into a container (Fig. 1), then insert nozzle of VISGAGE into this oil (fluid) when temperature is approximately 80°F (27°C). Best results are achieved when tests are made at 80°F (27°C).

After inserting nozzle in oil to be tested, slowly withdraw plunger (Fig. 1). If an air bubble appears in the test tube, invert the VISGAGE (Fig. 2) and discharge the air with a small amount of oil, Insert nozzle in oil, slowly withdraw the plunger and completely fill the test tube with oil, free of air bubbles, (See back page for instrument description)

HOW TO PLACE VISGAGE IN DRAFT PROOF CASE:

Adjust the plunger to position ball in test tube at O SUS line (Fig. 3). Position VISGAGE in draft proof case with plunger rod extending through slot at right side of case (Fig. 4). Close and lock cover: Allow the oils to attain the same temperature.

• Hold the case with VISGAGE in horizontal position at eye level, fifteen inches away, with scale in upright position (Fig. 3}. 'Instrument will be facing you with reference tube over plunger tube.
• With both balls on zero line, tilt instrument with nozzle end down {Fig. 5) to an angle between 30 and 45 degrees so balls move through the oils toward the line at left side of scale. (NOTE: To develop your proficiency and to determine best angle of tilt, make VISGAGE tests using a standard fluid of known viscosity.)
• Give balls the run of the oils.
• As the leading ball approaches the line at the left of scale (200/400 SUS line), gradually move the instrument to horizontal position to stop leading ball exactly on the line.
• The point on the scale of the lagging ball indicates the viscosity of the tested oil directly in Saybolt Universal Seconds at 100°E After a few trials, any operator can check the viscosity of oils to an accuracy of 95% or better; and if skillful, to even closer accuracy.

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