You may have heard the recommendation that “a temperature & humidity test chamber should use purified water.” But why is that? Can other types of water not be used?

There are valid reasons for this suggestion. If ordinary water is used in a temperature & humidity test chamber, the humidity particles generated tend to be larger. Common humidity sensors in such equipment, such as capacitive sensors or Honeywell sensors, can be affected over time. Some humidity sensors have printed circuit boards that lack anti-oxidation or waterproof coatings, meaning poor-quality water could lead to short circuits.

Additionally, tap water contains calcium ions, magnesium ions, potassium ions, sulfates, and other trace minerals. These impurities may:

Affect test samples by introducing unwanted chemical interactions.
Cause scaling inside the equipment, reducing performance and longevity.
For these reasons, purified water (or filtered/softened water) is strongly recommended to ensure accurate test results and prolong the equipment’s lifespan.

This concludes our discussion on why purified water is preferred for temperature & humidity test chambers. Water quality is just one of many operational considerations—there are numerous other factors to keep in mind when using such equipment.

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