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How static charge affects drop count test results

When performing a drop count tests, it’s important to minimize interferences that may affect your results. In this blog, we will discuss the effects of static charge.

First, what is static electricity and how is it formed? Static electricity is an imbalance of electric charges within or on the surface of a material typically produced by friction in a dry, low-humidity environment. For example, the dry conditions in the winter are right for experiencing static more often than in the summer months.

In our experiment, first, we added drops to a plastic vial that we introduced a static charge. While holding the bottle vertically to optimize consistent drop release and size, the drops were attracted to the side of the vial and were narrow and elongated in appearance. The charged static surfaces reacted and changed the performance and behavior of the drop.

Next, we added drops to the vial with no static present. We wiped down the vial and dropper bottle with a damp paper towel/cloth to remove any static charge. The drops fell directly into the middle of the vial and the shape and size of the drops were normal. Simple measures such as using a humidifier in a room or opening a window can prevent or remove static charge.

The static charge introduced in this instance reduced the drop size by 17%. Drop count kits are usually +/- 10% accurate. Given drop count test kits and dropper tips are standardized for a specific size drop, test results and data could significantly be skewed if there is significant static charge present.

AquaPhoenix recommends reviewing and preparing for all potential interferences including static charge to provide accurate reliable test information.



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