In reference to cooling tower sump water, what is the ideal temp to test pH?

• A. 70-80 F
• B. 60-70 F
• C. 90-100 F
• D. 80-90 F

Answer: (A)

pH readings are influenced by temperature, so you want the measurement to reflect the water’s actual operating condition. Cooling tower sump water typically sits around room temperature, and testing in the 70–80°F range gives a pH value that represents the chemistry the tower will experience during operation. If you test much cooler or much hotter than the sump temperature, the reading can misrepresent how the chemicals will behave, leading to improper dosing or control. The 70–80°F range is a practical, representative temperature for this purpose, which is why it’s the best choice.