Pyxis ST-604 Inline Temperature + % Chlorine (Bleach, Low Range) Sensor
Inline temperature + % chlorine sensor for bleach concentration, low range (0-2%). Dual 4-20mA + RS-485, 7-pin.
Pyxis ST-604 Inline Temperature + % Chlorine (Bleach, Low Range) Sensor
The Pyxis ST-604 is an inline, temperature-compensated sensor that measures % chlorine concentration in bleach solutions over a low range of 0-2%. It delivers dual 4-20mA analog outputs plus RS-485 Modbus communication through a single 7-pin connector, so it drops into existing chlorine monitoring and control loops with minimal wiring changes.
Description
The Pyxis ST-604 is an inline, temperature-compensated sensor built to measure % chlorine concentration in bleach (sodium hypochlorite) solutions over a low range of 0-2%. It is designed for facilities that need precise, low-dose chlorine measurement rather than broad-range detection, making it well suited to applications where bleach is dosed in small, tightly controlled increments.
The sensor automatically compensates for changes in process water temperature, so readings stay accurate as conditions shift throughout the day or across seasons. Output is delivered through dual 4-20mA analog signals plus RS-485 Modbus communication, all routed through a single 7-pin connector.
This combination of analog and digital output lets the ST-604 feed both legacy analog controllers and networked PLC/SCADA systems from one instrument, simplifying wiring and giving plant engineers flexibility when retrofitting or expanding existing chlorine monitoring loops.
Why Use This
Accurate Low-Range Chlorine Monitoring
The 0-2% range and built-in temperature compensation give reliable % chlorine readings for bleach disinfection systems even as process conditions vary.
Flexible System Integration
Dual 4-20mA analog outputs combined with RS-485 Modbus let the sensor communicate with both older analog controllers and modern networked control systems through one 7-pin connector.
Applications
- Low-dose bleach chlorination — precise monitoring of sodium hypochlorite dosing in the 0-2% range
- Drinking water and process water disinfection monitoring — tracks chlorine levels for treatment control
- Retrofit into existing chlorine monitoring loops — dual analog/digital output simplifies integration
- PLC/SCADA-based dosing control — RS-485 Modbus enables networked automation
FAQ
What does the ST-604 measure?
It measures % chlorine concentration in bleach (sodium hypochlorite) solutions over a low range of 0-2%, with automatic temperature compensation.
What outputs does it provide for control system integration?
The ST-604 provides dual 4-20mA analog outputs plus RS-485 Modbus communication, all through a single 7-pin connector, so it can feed both analog controllers and networked SCADA systems.
Does the sensor account for temperature changes in the process water?
Yes. The ST-604 is temperature-compensated and automatically adjusts its % chlorine readings as water temperature shifts.
How difficult is it to wire into an existing installation?
Wiring is simplified by a single 7-pin connector that carries both the dual 4-20mA outputs and the RS-485 Modbus signal, reducing the number of separate connections needed in the field.
Resources
Related Products
316L stainless steel inline fluorometer measuring PTSA (0–500ppb) and turbidity (0–200NTU) with colour and turbidity compensation. Rated to 290psi, suited to data centre and high-pressure cooling systems.
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.
Compact dual-channel controller for pH and ORP monitoring with direct pulse output to dosing pumps.
PVDF injection quill with integral non-return valve for safe chemical injection into pressurised pipelines.
Other Models in This Line
Latest Resources
Need help with selection or sizing?
Our engineers are ready to evaluate your requirements and recommend the right solution.