Pyxis ST-765SS-SO3 Sulfite + pH Sensor – Sensor Only (Stainless Steel)
Stainless steel sulfite + pH sensor, 0-5ppm, sensor only with no flow reservoir. Dual 4-20mA + RS-485, 8-pin connector.
Pyxis ST-765SS-SO3 Sulfite + pH Sensor – Sensor Only (Stainless Steel)
The Pyxis ST-765SS-SO3 is a stainless steel, membrane-less multi-parameter sensor that measures sulfite, pH, and temperature in a single probe using Pyxis Lab's bare-gold electrochemical detection technology. It is suited to dechlorination and boiler feedwater oxygen scavenger monitoring, 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-SO3 is a stainless steel, membrane-less multi-parameter sensor that measures sulfite, pH, and temperature from a single probe, using Pyxis Lab’s bare-gold electrochemical detection technology. It ships sensor-only, without a flow reservoir kit, for installation into an existing housing.
Sulfite is measured over a 0-5ppm range, making the sensor well suited to dechlorination and boiler feedwater oxygen scavenger monitoring where sulfite dosing needs to be tracked alongside pH. The reference electrode assembly is replaceable and front-loading, reducing startup polarisation time and 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
Dechlorination process visibility
Tracks sulfite alongside pH in one probe, supporting boiler feedwater oxygen scavenger dosing control.
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 sulfite and pH together during dechlorination processes
- Boiler feedwater oxygen scavenger control — monitors sulfite dosing used as an oxygen scavenger
- Industrial process water treatment — continuous inline sensing for PLC/SCADA-connected systems
FAQ
What applications is this sensor designed for?
It is suited to dechlorination and boiler feedwater oxygen scavenger monitoring, tracking sulfite and pH together.
What is the sulfite measurement range?
The sensor measures sulfite over a 0-5ppm range, 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 connect to 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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