Testing viscosity with the Visgage — Transcript

Learn how to accurately test oil viscosity using the Visgage by purging, filling, temperature equalization, and reading the scale.

Key Takeaways

Proper purging of the plunger tube is essential to avoid contamination.
Temperature equalization between reference and test oil is critical for accurate viscosity readings.
Aligning the balls and correct instrument handling affect test accuracy.
Multiple readings improve reliability by minimizing errors.
The Visgage provides a straightforward method for measuring oil viscosity.

Summary

Purge the plunger tube by drawing in and flushing out oil to avoid contamination from previous tests.
Fill the plunger tube with oil, ensuring all air is flushed out of the sample.
Pull the plunger rod just past zero to align the balls before testing.
Allow the Visgage to sit until oil temperatures equalize, as viscosity depends on temperature.
Line the balls up with zero to prepare for the test.
Tilt the instrument quickly to a 40-degree angle and then return it to level.
Read the oil's viscosity from the scale where the slower ball stops.
Take the average of five readings to reduce operating errors.
The procedure ensures accurate and reliable viscosity measurements.
The video provides a step-by-step guide for using the Visgage instrument.

Full Transcript — Download SRT & Markdown

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First, purge the plunger tube to clean it, as residual oil from previous testings may contaminate your results.

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To purge the plunger tube, simply draw in a small amount of oil, then flush it out.

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Next, fill the plunger tube with oil, making sure to flush all air out of the sample.

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As you fill the tube, pull the plunger rod just past the zero so that the balls will line up.

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Let the Visgage sit until oil temperatures have equalized, since viscosity changes with temperature, the reference oil and the oil you are testing need to be the same temperature.

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To run the test, line the balls up with zero.

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Hold the ends of the scale and quickly bring the instrument to a 40-degree angle, then return to level so that the leading ball stops at the leftmost line.

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The oil's viscosity can be read from the scale where the slower ball has stopped.

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We recommend taking the average of five readings to minimize operating errors.

Topics:Visgageoil viscosity testviscosity measurementplunger tube purgingoil temperature equalizationviscosity testing procedureviscosity scale readingoil sample preparationinstrument handlingLouis C. Eitzen

Frequently Asked Questions

Why is it important to purge the plunger tube before testing?

Purging the plunger tube removes residual oil from previous tests that could contaminate the sample and affect the accuracy of the viscosity measurement.

How does temperature affect viscosity testing with the Visgage?

Viscosity changes with temperature, so the reference oil and the test oil must be at the same temperature to ensure accurate and comparable viscosity readings.

Why should multiple readings be taken during viscosity testing?

Taking the average of five readings helps minimize operating errors and increases the reliability and accuracy of the viscosity measurement.

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