Control issues: to get accurate readings from chemical controllers, the sensors must be maintained properly. Here are some pointers.(Tech Talk)

Automated water chemistry controllers are becoming a staple for most commercial pools and some residential applications as well. The key to reliable readings is the proper installation and maintenance of the sensors.

Here are some tips on how to keep controllers working to perfection.

Mounting the sensor

A standard automated chemical controller uses an oxidation reduction potential sensor for monitoring and controlling sanitizers. It also utilizes a sensor for pH control.

Sensors can be mounted directly on the main circulation line. However, it is recommended that this installation method be used only for pipes 2 inches in diameter or smaller. Reason: The tip of the sensor must always be submerged in water. If the sensor is subjected to air or splash log water, the readings could be compromised.

If you have pipe that is larger than 2 inches in diameter, a 1/2-inch bypass line is recommended to mount the sensor. The key to a bypass line is to make sure there is constant water flow. This is done by using the system's pressure differential. The intake side of the bypass line should be installed on the pressure side of the circulation system after the filter. The return side should be installed to a low pressure area such as the vacuum side before the circulation pump.

It is important to protect the sensors as best you can. Running the bypass line after the filter and returning it to the influent side will ensure proper flow and cut down on the possibility that debris will harm the sensor.