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A pH sensor must be at least 15° above horizontal to consistently function properly. DO NOT install sensors in a port perpendicular to the vessel wall. The liquid in the sensor contains small air bubbles. If not inclined slightly above horizontal, a bubble can adhere to the pH bulb where it will affect the sensor’s performance.
Manufacturers of Sensors for Science and Industry
USA
1-800-288-2833
Intl: +1-949-829-5555