Application Examples 16_pH Control using the Tiger 320 Series
The Tiger 320 Series controller using a pH sensor input module operates directly with standard pH sensor outputs.
For quick and easy sensor calibration, the Tiger 320 Series controller has On-demand single and two-point calibration functions from the front panel program button.
The relay outputs controlling the pH reagent are programmed in the repeat mode (programmable OFF/ON-time). After a selected time interval, the solution pH is checked (OFF-time), and if reagent is required, a programmed (ON-time) amount of the reagent chemical (acid or caustic) is added. The cycle continues until the reaction tank is at the correct pH level.
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APPLICATION VARIATIONS
- RTD input for temperature compensation.
- Relays for temperature control and alarm functions.
- A small macro can be added so that the reagent relay ON time is automatically adjusted to regulate the reagent flow proportionally relative to the pH setpoint error.
- Automation output for sensor retraction and calibration.
- PID control.
- Data logging.
- Batch processing.
- Continuous on-line control.
- Analog output