pHionics STs Series Galvanic Dissolved Oxygen Sensor

A narrow diameter allows the STs Series to go where other sensors cannot while the 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 3-6 months, the STs Series Dissolved Oxygen typically only requires electrode replacement every 2-3 years.  In addition, the rugged Teflon® membrane resists scratches and tears that would put other sensors out of commission.  

When electrode replacement is needed, the procedure is done within 30 seconds, as shown in the video below. All these features free you up to focus on actionable insights from the data instead of spending time performing maintenance or troubleshooting.

Ranges Available

0-20 mg/L or 0-200% saturation depending on scaling with datalogger or RTU

Key Features

• Galvanic electrode with a large surface area anode to increase stability and prevent clogging
• Secondary 0-50°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
• 4-20 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.