Although the PH220 pH Probe Amplifier has been retired, some replacement parts remain available (see Ordering Info). The PH220 was a high-impedance differential amplifier used with pH and other ion-specific electrodes (e.g., NH4, CO2, NO3, K, Cl, Ca, SO4, and Na). It typically was used in laboratory settings where inexpensive, unamplified ion-specific probes could be connected in succession.
PH220 Compatibility Information
Connected sensors are measured by the VoltDiff Instruction when using CRBasic or by Instruction 2 (Differential Volts) when using Edlog.
A differential analog input, 12 Vdc, and GND connections are required.