While the method for oil sampling varies based on the application and machine being sampled, most oil sampling equipment may be used in a variety of situations.

Why a Good Oil Sampling Hardware Matters

It's critical for a lubrication expert to know how to properly obtain an oil sample. When you take samples from the wrong places, or when you handle them incorrectly, you might get a false-positive or false-negative result of what's going on within your equipment. For the best representative sample, correct techniques and supplies are required. For consultation on how to perform sampling, you can contact our engineers. 


Sampling Hardware

Extraction Tube

Oil is transferred from the valve or sump to the sample container through a sample extraction tube. It will have a probe or adaptor fitting on the end if it is used with a valve. Low-density polyethylene (LDPE) is commonly used for sample extraction tubing, which is purchased in bulk and cut to size as needed. The most common diameters of tubing are 3/16, 1/4, and 5/16 inches. Microbore tubing can be used for more precise sampling or for sample equipment that is difficult to reach. Sample tubing with a smaller diameter, usually about 2 millimeters, is known as microbore tubing.

 vacuum pump checkfluid


Vacuum Pump

Oil samples are extracted using vacuum pumps from systems that do not have sampling valves. The fluid sample is pulled to the sample vial using a flexible extraction tube. If a sample valve is used, this tube can be equipped with sample port adapters.

Check to see if your vacuum pump can handle the size of your tubing. To ensure a vacuum-tight seal, the bottle should be securely screwed onto the pump. It's a good idea to prepare a zip-lock sandwich bag for each bottle.


lube accessories vacuum standard flow oil sampling kit


Sample Bottles 

The application and intended oil testing will determine which oil sample bottle to use. You'll want to think about things like bottle size, cleanliness, and material composition before you buy a sample bottle. There are three types of materials that are commonly used to make bottles:sampling bottles 3 types


Opaque plastic

One of the most prominent bottle materials on the market is high-density polyethylene (HDPE). Because of its opaqueness, you should strive to avoid this substance because it makes it difficult to visually analyze the sample. There is also polypropylene that is less opaque.


Pet Bottle

Most forms of lubricating oil and hydraulic fluids, including synthetics, may be used with this type of plastic since it is fully transparent. Polyvinyl chloride and other transparent polymers are occasionally used.


Glass Bottle

Glass bottles are generally cleaner than plastic bottles and may be cleaned and reused several times. Glass bottles are more costly, heavier, and more likely to break than those made from plastic.


Sampling Ports

Sampling ports allow ease and convenience in sampling. The purpose of a suitable sample port is to collect samples from the turbulent zones of return lines. These locations give you accurate samples that best represent the current conditions in your machines. Installing sampling ports also addresses safety concerns. Sampling from highly pressurized systems could have serious safety concerns if not done properly. 

 actual sampling valve


Sample Valves

For clean and efficient oil sampling, sample valves are placed into ports on sumps and oil circulation lines. They are non-intrusive to the machine's usual functioning and assist to avoid leaks and inadvertent sample contamination. 


High-Pressure Valves

For safety concerns, high-pressure systems are difficult to sample during operation. To lower the pressure, either a portable pressure reducer or stainless-steel helical tubing must be used. Make sure you obtain expert guidance on how to use the right oil sampling equipment and how to do it properly.


Minimess Valves

The minimess or probe valve is often considered as the greatest valve for getting a consistent and accurate sample. If feasible, for lines with high fluid velocity, minimess valves should be put on an elbow. Attach the probe to the tube that connects the sample bottle to the valve to draw a sample. It's also possible to utilize probe adapters.

For specialized applications and purposes, several sampling valves are available. A tethered dust lid to avoid contamination and oil leaks after sampling is one of the numerous benefits of many of these devices. Having just one or two sealing elements, as well as the possibility of the "soft-seat" design being damaged in high-pressure situations, are common drawbacks.


Highly Pressurized versus Low-Pressure Systems


 kp pushbutton


Pressurized Oil Sampling Valves

By pressing a button on the KP Pushbutton Oil Sampling Valve, you may easily sample pressurized systems. The use of a push-button avoids the need for probes and the possibility of cross-contamination. Place the bottle under the button's nozzle and push it to get a sample.

 lp pushbutton png

Low-Pressure Sampling Valves 

The LP sampling valve comes with a push-button, press to open the valve, and release to close it automatically. The sampling valve comes with a 360-degree rotating spout that makes sampling and installation a breeze. The valve is also equipped with vacuum-tight elastomeric seals with a patent.



Source: machinerylubrication.com