The OxyGuard Model 420 Oxygen Probe combines the proven performance of the OxyGuard Stationary probe with modern electronic technology.

Built into the probe is a two-wire 4-20 mA loop-powered transmitter. The probe produces a galvanically isolated 4 to 20 mA output proportional to the oxygen concentration of the medium in which it is placed. This capability permits the Model 420 to communicate directly with any processing , monitoring or control equipment which accepts a standard 4-20mA input.

Examples include display indicators, alarms, data loggers and PC systems with A/D input boards. Because the output is galvanically isolated, any number of probes can be installed in the same water circuit without the risk of ground loop interference.