The pHionics STs Series Dissolved Oxygen sensor accurately measures dissolved oxygen (0 to 20 mg/L or percent saturation) and temperature (0 to 50 C) over long periods of time with little maintenance required. It outputs two noise-resistant 4 to 20 mA signals compatible with most dataloggers or remote telemetry units. A narrow diameter allows the STs Series to go where other sensors cannot while a durable, chemical-resistant housing ensures many years in-use. The electrode tip (anode) has a large surface area that improves oxygen exchange consistency across the membrane while reducing the frequency of fouling.
In contrast to other dissolved oxygen sensors that require membrane and reference solution replacement every 3 to 6 months, the STs Series Dissolved Oxygen typically only requires electrode replacement every 2 to 3 years. This is possible because the electrode is permanently sealed to maintain a stable and sterile internal environment. In addition, the rugged Teflon membrane resists scratches and tears that would put other sensors out of commission. All these features free up the user to focus on actionable insights from the data instead of spending time performing maintenance.
Features:
- Galvanic electrode with a large surface area anode to increase stability and prevent clogging
- Secondary 0 to 50 C temperature sensor
- Chemical-resistant Delrin, PVDF, and 316 Stainless Steel housing (Titanium optional) for long-term monitoring
- Narrow diameter (0.75 inches or 1.9 cm)
- Removable electrode guard to reduce debris buildup and protect from damage
- Fully submersible up to 70 psi
- Shielded, Kevlar-reinforced, water-blocked polyurethane cable
- 4 to 20 mA signal capable of transmission up to 3 miles (with proper wire gauge)
- Patented pHiConn connections to easily replace any part without special tools
- Automatic Temperature Compensation (2% per degree Celsius)
- Reversible Input Protection and Operation
- Low power usage for long-term water quality monitoring
- Isolated to prevent ground loops
- Signal conditioning to remove background noise
Specifications
- Outout: 4 to 20 mA
- DO range: 0 to 20 mg/L (ppm)
- Electrode type: Galvanic cell with Teflon membrane
- Minimum flow rate: 0.457 m per second
- Transmitter type: 2-wire
- Pressure range: 0 to 70 psi
- Automatic temperature compensation: 2% per C
- Isolation: 600 VDC
- Power supply: 8 to 40 VDC
- Response time: 98% less than 60 seconds
- Wetted materials: 316 stainless steel, Delrin, Viton, glass, epoxy
- Length: 36.20 cm
- Width: 1.9 cm maximum
- Weight (No cable): 0.227 kg
- Linearity: +/- 0.5% of full scale
- Accuracy: +/- 2% of full scale
- Sensitivity: +/- 0.05 of full scale
- Stability: +/- 2% of full scale
- Repeatability: +/- 1% of full scale
