1
Introduction
The Pyxis ST-590 inline fluorometer sensor measures the concentration of Fluorescent Polymer in water.
It can be simply inserted to the compression fitting port of a custom-made tee. The standard ST-001 in-
stallation tee provided with each ST-590 sensor, has two ¾ inch female NPT ports and can be placed to an
existing ¾ inch sample water line. Pyxis Lab also offers 2” and 3” Tee formats for larger flow installations.
The 4–20mA current output of the ST-590 sensor can be connected to any controller that accepts an iso-
lated or non-isolated 4–20mA input. The ST-590 sensor is a smart device. In addition to measuring polymer
fluorescence, the ST-590 sensor has extra photo-electric components that monitor the color and turbidity
of the sample water. This extra feature allows automatic color and turbidity compensation to eliminate
interference commonly associated with real-world waters.
The Pyxis ST-590 sensor has a short fluidic channel and can be easily cleaned. The fluidic and optical ar-
rangement of the ST-590 sensor is designed to overcome shortcomings associated with other fluorometers
that have a distal sensor surface or a long, narrow fluidic cell. Traditional inline fluorometers are susceptible
to color and turbidity interference and fouling and are difficult to properly clean.
1.1
Main Features
The ST-590 measures Fluorescent Polymer in a water sample and includes the following features:
• Easy calibration with using
uPyxis®
Mobile or Desktop App.
• Automatic compensation for turbidity up to 150 NTU and color created by up to 10 ppm iron or
equivalent to 10 ppm humic acid.
• Diagnostic information (sensor fouling, color or turbidity over range, failure modes) are available in
uPyxis®
App or via Modbus RTU.
• Easy to remove from the system for cleaning and calibration without the need for any tools.
ST-590 User Manual
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Summary of Contents for 50690
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