Pyxis ST-774 Ultra-Low Inline Dissolved Oxygen Sensor with Flow Cell
Ultra-low range inline luminescent DO sensor with flow cell (0.1ppb-2,000ppb). Dual 4-20mA + RS-485, 8-pin.
Pyxis ST-774 Ultra-Low Inline Dissolved Oxygen Sensor with Flow Cell
The Pyxis ST-774 is an ultra-low range inline luminescent dissolved oxygen sensor for trace-level DO monitoring from 0.1ppb to 2,000ppb, avoiding the membrane replacement and electrolyte refills needed by older galvanic and polarographic sensors. It includes a flow cell for stable inline sampling and outputs data via 4-20mA analog and RS-485 Modbus through an 8-pin connector.
Description
The Pyxis ST-774 is an ultra-low range inline luminescent (optical) dissolved oxygen sensor built for trace-level DO monitoring, covering a range of 0.1ppb to 2,000ppb. As with other Pyxis luminescent DO sensors, it avoids the membrane replacement and electrolyte refills required by older galvanic and polarographic technologies.
The sensor includes a dedicated flow cell that stabilizes sample presentation for accurate inline measurement at trace concentrations. Data is output through both 4-20mA analog and RS-485 Modbus via an 8-pin connector, allowing integration with plant monitoring and control systems.
Its ultra-low detection range makes it particularly suited to applications where trace dissolved oxygen must be tracked with precision, such as high-purity water systems.
Why Use This
Ultra-Low Range Detection
Measures dissolved oxygen from 0.1ppb to 2,000ppb, suited to boiler feedwater and other trace-level applications.
Stable Inline Sampling
The included flow cell provides a controlled sampling environment for consistent inline readings.
Low Maintenance
Luminescent optical sensing removes the need for membrane replacement and electrolyte refills.
Applications
- Ultra-pure water monitoring — trace-level DO detection down to 0.1ppb
- Boiler feedwater monitoring — tracking dissolved oxygen at the low concentrations relevant to feedwater quality
- Inline process water quality monitoring — continuous DO tracking via the integrated flow cell
FAQ
What measurement range does the ST-774 cover?
It measures dissolved oxygen from 0.1ppb to 2,000ppb, an ultra-low range suited to trace-level monitoring.
Why does this sensor include a flow cell?
The flow cell provides stable inline sample presentation, which supports accurate trace-level DO readings.
Does the ST-774 require membrane or electrolyte maintenance like older DO sensors?
No. It uses luminescent optical sensing, which avoids the membrane replacement and electrolyte refills needed by galvanic and polarographic sensors.
How does the sensor connect and output data?
It connects via an 8-pin connector and outputs data through both 4-20mA analog and RS-485 Modbus.
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