Choosing the right controller needs to be decided based on the following criteria:
- Parameters to be measured: pH, mV, T°C, Conductivity
- Range
- Control desired: ON/OFF or proportional
- Set points: 1 or 2 for pH, 1 for other types of controllers
- Is an alarm needed
- Output signal: analog 4 to 20 mA to record or digital RS-232
We have separated our controllers into 6 categories: