Water is the fundamental element for the survival of nearly all life on the planet. All animals and plants require water in a particular form. Some will thrive in fresh water while others do well in water mixed with other compounds to form acidic or saline conditions. The concentration of these compounds can be measured against a scale to determine if the prevailing conditions are neutral, acidic or basic. In natural settings, it is challenging to dictate the conditions, which can jeopardise the development of your agricultural products. Using pH controllers makes things predictable and helps to ensure the right conditions for the relevant plants or animals. Here is a look at some of the essential steps used in pH control systems:
Batch Processing System
A batch processing system relies on a relay pH controller with 'on' and 'off' functionalities. The system begins with pumping a unique process solution into a tank to fill it up. Agitation then follows to allow mixing of the components as you add a chemical to adjust the pH of the solution. The addition of the chemical continues until you arrive at the desired pH level. The relay pH controller takes over the control of the chemical supply by turning on and off, maintaining the pH at the desired level. At this point, you can pump the solution out of the tank to other sections of the facility in need of the solution.
Indeed, the batch processing system requires a certain level of technical sensing to show when the tank is empty or full. It also locks the pH control supply when the solution reaches the appropriate pH.
The Continuous-With-Tank System
Continuous-with-tank systems are like batch processing systems. However, the tank system allows a constant input of the chemical agent. There is an 'on' and 'off' relay pH controller with a deadband or latching feature, which holds the final pH control elements. Generally, the continuous-with-tank system is relatively accurate, but your pH tends to revolve around certain levels. It works best for projects where slight deviations from the desired pH will not affect the desired outcome.
Continuous On-line pH Control System
The continuous on-line control system employs a proportional pH gain controller. The controller comes with analog outputs designed for two pH types. Usually, the pH here only requires slight adjustment, and a pneumatic valve will deliver the reagent required to alter the pH accordingly.