Anatomy of a Representative Oil Sample: Part 2 - Sample Extraction Tools
Bennett Fitch, Noria Corporation
Tags: lubricant sampling
The methods and tools used to extract an oil sample are crucial for quality oil analysis. These would include sample valves, transfer tubing, suction devices and anything that facilitates transferring oil from its original live-zone location to the sample bottle while avoiding further contamination in the process.
This article is the latest installment of a series of “anatomy” lessons within Machinery Lubrication magazine. In this issue, effective extraction tools for taking a representative oil sample will be discussed. Part 1 of this three-part series examined the important role an oil sample bottle plays in obtaining a representative sample. In the next issue, how to select sampling frequency and sample locations will be addressed.
Access Methods
Retrieving an oil sample from a machine can be challenging. Among the techniques used to accomplish this task include the tap/drain method, drop-tube sampling and live-zone sample valves, which is the preferred option.
Sample locations for a splash/bath-lubricated machine
Sampling from a drain port threatens the ability to obtain a representative sample because it is located where sediment or water collects due to stratification. This method also allows environmental contaminants to be introduced through external drain surfaces or via sample bottles without proper lids. Considered the least effective way to obtain a sample, it should only be used if no other alternative is possible or if you are merely collecting the sample to analyze accumulated bottom sediment and water.