pH Specification

The pH system will:

1. Measure pH levels.

   1. A SLS Electrode pH Combination Glass BNC will measure the pH.

   2. Measure to a resolution of 0.1 pH value

2. Use Circuitry to digitise signal from pH measuring device.

   1. FRDM KL25Z Microcontroller.

   2. LMC6042 Operational amplifier.

   3. ICL7660AIBAZA charge pump inverting voltage converter.

3. Maintain a set pH level.

   1. A control algorithm will be written to interface between read pH value and output of acid into system.

4. Hold a reservoir of liquid

   1. A PTFE container will be implemented to hold a strong acid of known molarity.

   2. Will support 250ml of solution.

5. Release fluid into bath.

   1. Non corrosive valves will be used to control flow of fluid from reservoir.

   2. Actuators will be used to control said valves and release acid.

   3. Non corrosive piping will be used to control path of acid.

6. Mount to the main chassis.

   1. Actuators, valves and piping will exist as a standalone structure to be mounted to the main chassis.

7. Be safe

   1. All solutions will be contained with no exposure to external structure.

8. Be powered from the main PSU

   1. Actuators and circuitry will interface and be powered from the PSU.

   2. Relevant power electronics will be contained.