The CS547A Conductivity and Temperature Probe has replaced the CS547. The CS547A measures electrical conductivity using three cylindrical stainless steel electrodes. To reduce electrochemical reactions, minimize corrosion, and extend the probe's life, the electrodes are ac coupled, and a bipolar excitation is applied. Temperature is measured with a thermistor.

The probe is entirely encased in epoxy that is resistant to corrosion. Its rounded ends facilitate installation and removal. For ground water applications, a weighted option is available. One A547 Conductivity Interface is required for each CS547A used directly with the datalogger. Multiple CS547As can be measured with one A547 connected to an AM16/32 or AM416 multiplexer.