Pyxis ST-765SS-DCL Free Chlorine + Sulfite + pH Sensor – Sensor Only (Stainless Steel)
Stainless steel dechlorination sensor measuring Free Chlorine (0-5ppm) and Sulfite (0-100ppm) simultaneously, plus pH. Sensor only, no flow reservoir. Dual 4-20mA + RS-485.
Pyxis ST-765SS-DCL Free Chlorine + Sulfite + pH Sensor – Sensor Only (Stainless Steel)
The Pyxis ST-765SS-DCL is a stainless steel, membrane-less multi-parameter sensor that measures free chlorine and sulfite simultaneously, alongside pH and temperature, in a single probe using Pyxis Lab's bare-gold electrochemical detection technology. It is suited to dechlorination monitoring where residual oxidizer and neutraliser dosing both need tracking in one pass, and ships sensor-only without a flow reservoir kit. Dual isolated 4-20mA outputs plus RS-485 Modbus support direct integration with a PLC, SCADA, or third-party controller.
Description
The Pyxis ST-765SS-DCL is a stainless steel, membrane-less multi-parameter sensor that measures free chlorine and sulfite simultaneously, alongside pH and temperature, from a single probe. It uses Pyxis Lab’s bare-gold electrochemical detection technology and ships sensor-only, without a flow reservoir kit.
Free chlorine is measured over a 0-5ppm range and sulfite over 0-100ppm, letting one probe track both residual oxidizer and neutraliser dosing in a single pass — a fit for dechlorination monitoring where both parameters need watching together. The reference electrode assembly is replaceable and front-loading, giving a typical service life of up to 2 years.
Dual isolated 4-20mA outputs plus RS-485 Modbus, via an 8-pin connector, support direct integration with a PLC, SCADA, or third-party controller.
Why Use This
Simultaneous oxidizer and neutraliser tracking
Measures free chlorine and sulfite together in one probe, so dechlorination control loops need only a single sensor.
Reduced maintenance
The replaceable, front-loading reference electrode typically lasts up to 2 years and cuts startup polarisation time.
Flexible controller integration
Dual isolated 4-20mA outputs and RS-485 Modbus connect directly to a PLC, SCADA, or third-party controller via an 8-pin connector.
Applications
- Dechlorination monitoring — tracks residual free chlorine and sulfite neutraliser dosing together
- Industrial process water treatment — combined oxidizer/neutraliser monitoring in a single probe
- PLC/SCADA-integrated control loops — dual 4-20mA and RS-485 Modbus outputs for direct system tie-in
FAQ
Why measure free chlorine and sulfite in the same probe?
This DCL variant is designed for dechlorination monitoring, where residual oxidizer (free chlorine) and neutraliser (sulfite) dosing both need tracking in one pass.
What are the measurement ranges?
Free chlorine is measured over 0-5ppm and sulfite over 0-100ppm, alongside pH and temperature.
Does it include a flow reservoir kit?
No, it ships sensor-only, with no flow reservoir kit included.
How does it integrate with a control system?
Via dual isolated 4-20mA outputs plus RS-485 Modbus over an 8-pin connector, for direct integration with a PLC, SCADA, or third-party controller.
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