The Pyxis ST-525 series of sensors use temperature-tolerant and humidity-resistant optical filters that can be operated under a wide range of ambient conditions without the need of humidity and temperature regulation. With this design the performance of the ST-525 series can remain stable and consistent for an extended period time.
The Pyxis ST-525 series sensor measures the concentration of fluorescein in water, commonly used as a fluorescent tracer in water treatment applications. This sensor platform is offered in UPVC or 304-stainless steel body depending on application pressures. The SS (stainless steel) versions of the sensor platform are ideally suited for applications of monitoring boiler feedwater or boiler blowdown after being properly cooled to near the ambient temperature. The UPVC versions of the sensor platform are better suited for application pressures below 100psi and temperatures below 120oF.
The 4–20mA current output from the sensor may be connected to any controller that accepts an isolated or non-isolated 4–20mA input. The ST-525 series sensor is a smart device. In addition to measuring fluorescence, the ST-525 series 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 experienced in real-world applications as well as cleanliness diagnostic data.
The ST-525 series of sensor are offered in two detection range formats. For standard applications such as boiler feedwater, the 0-60ppb range of sensors is recommended. For high range applications such as boiler blowdown, the 0-500ppb range of sensors labeled as HR is recommended. Both format ranges are easy to calibrate using the uPyxis® Mobile or Desktop App. Pyxis Lab calibration standard solutions containing Fluorescein in the range of 10 to 60 ppb for standard range sensors or 250-500ppb for high range sensors can be used for the calibration of the ST-525 series. The calibration standard may also be the water sample itself if the Fluorescein concentration of the sample is measured and validated by a calibrated offline fluorometer. This allows the ST-525 series sensor to be calibrated online without being removed from the system. The uPyxis® App also provides diagnostic information about the ST-525 series sensor such as: sensor fouling, color or turbidity over range, failure modes, etc. This diagnostic information can also be available via Modbus RTU. For proper calibration, the ST-525 series sensor should be diagnosed for cleanliness via the uPyxis APP, then cleaned using the Pyxis Probe Cleaning Kit (SER-01). Once cleaned, sensor cleanliness should be confirmed via the uPyxis APP diagnostics function, then the user may proceed to sensor zero and slope calibration.
Specification
Pyxis
Pyxis
Pyxis
Pyxis
Pyxis
Pyxis
Pyxis
Pyxis
