Are the pH sensors still available for the P63 transmitter?
P63 transmitter and pH sensor availability
Yes, you can still get analog pH meters to wire up. If your transmitter has a pre-fix of A then you need to use an analog differential pH probe. If you have a B prefix then you need an analog combination probe. If you don't know which version you have hit the Diag Key then select information this will show a product number with either A or B prefix.