Hi Gowrishankar,
Below are the answers to your inquires.
3. High insulation resistance standoff and shielding will vary depending on the environment where the kit will be used. It is highly recommended to use High insulation resistance standoff if this kit will be integrated or will be surrounded with high voltage circuits. And a proper shielding should be applied for applications where RF noise is highly observed in the area.
For detail discussion about shielding and guarding, please refer to this link.
AD8603 can be directly connected to the input of the pH probe as long as a proper guarding/static shielding is observed. Due to the low frequency operating range of the circuit (<500Hz), the performance of the board would not be highly affected by the PCB impedance. It is highly affected by the input bias current of the buffer due to the high input impedance of the pH probe sensor. The circuit note for this kit gives us the overall performance of the board. It includes the system noise and offset generated base from the PCB design of the kit.
4. The software use for this kit is a labview and uses System Demonstration Platform (EVAL-SDP-CB1Z)
and SDP PMOD Interposer Board (SDP-PMD-IB1Z) to evaluate the kit using the evaluation software included in the kit. You can evaluate this kit using other microcontroller via its pmod pin (pin J2) which makes this board more flexible to use.
5. The RTD resistance value of the included evaluation software can be varied according to the application needed. The RTD should be connected properly in the kit since this creates current path to the 5kohms resistor (R2) that generates the voltage reference to the ADC.
Regards,
Erbe