Ruler Test Accuracy

Neal, I suggest reviewing the most recent ASTM method has been approved for the RULER D7590-09.

The title of the method is “Guide for Measurement of Remaining Primary Antioxidant Content In In-Service Industrial Lubricating Oils by Linear Sweep Voltammetry”


This should answer most of your questions on the RULER. Additionally it also covers the how to integrate RULER with other methods, and technologies.

The other ASTM methods that may be of interest to you are D6810, D6971, D4378 and D6224.

Hope this helps,

Jeff Chapin
315-447-3780
j.chapin@fluitec.com

When I got mine I did a fair amount of testing before I came to rely on it.

My focus was on RPVOT replacement, and it tracks very well there.

The few times I have had RULER run at my contract lab, my numbers have been real close.

Hi Neal

The precision of the RULER is 6%. There are some things to be aware of however. Some types of turbine oils contain a very small amount of phenols and during use you can observe the phenols deplete rapidly. There are several operational factors in a 7FA that can influence additive depletion.

We'd be pleased to provide further interpretation on the results for you if you wish, as the RULER is our technology.

Best of luck,
Greg Livingstone
g.livingstone@fluitec.com