The Pyxis ST-600 inline probe measures the concentration of bleach (sodium hypochlorite). The ST600 probe measures the optical density of the beach solution using a near UV light. The probe has a built-in reference light source and a reference light detector in addition to the main light source and main light detector. The wet part of the probe is a 6-inch long, 7 mm OD Teflon tubing. This configuration ensures long-term stable measurement of the bleach concentration. The ST-600 probe can be connected to any device that accepts an isolated or non-isolated 4-20mA input. Other features of the Pyxis ST-600 probe include:

• The probe can be conveniently connected to the suction or discharge side of the bleach pump tubing with using a union or a quick push-in connector.

• The ST-600 can be calibrated with a PC or smart phone app via a Bluetooth/Wifi adaptor.

• Diagnostic information (probe tubing fouling and failure modes) can be communicated to digital displays via Modbus RTU.

The Pyxis ST-600 only measures Bleach