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Part Number -
T-DS-STS3020x-025
pHionics STs Series™ Dissolved Oxygen sensor
3rd Party Sensor, HOBO RX Station-Compatible
Temporarily Unavailable
Sensor with durable, chemical-resistant housing that accurately measures dissolved oxygen and temperature over long periods of time.
Important Information
25-foot cable included. Manufactured and distributed by a third party, pHionics, this sensor can deliver real-time data to the LI-COR Cloud remote monitoring platform when connected to a cellular HOBO RX station via the Analog Module or with a HOBOnet wireless sensor network's Analog Mote.
*For custom cable lengths, contact our sales team.
Overview
The pHionics STs Series™ Dissolved Oxygen sensor accurately measures dissolved oxygen and temperature (0-50°C) over long periods of time with little maintenance required. These measurements are output via two noise-resistant 4-20 mA signals that easily connect to HOBO stations and HOBOnet motes with analog inputs. Available ranges are 0-20 mg/L or 0-200% saturation depending on the scaling you enter.
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 sensor 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 can be done within 30 seconds, as shown in the video below. All these features save you the time of having to perform maintenance.
Features
- Galvanic electrode with a large surface area anode to increase stability and prevent clogging
- Secondary 0-50°C temperature sensor
- Chemical-resistant 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
- Reversed 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
Dissolved Oxygen Sensor
| Output | 4-20 mA |
| Dissolved Oxygen Range | 0-20 mg/L (ppm) |
| Electrode Type | Galvanic cell with Teflon membrane |
| Minimum Flow Rate | 1.5 ft (0.457 m) per second |
| Transmitter Type | 2-wire |
| Automatic Temperature Compensation | 2% per °C |
| Isolation | 600 VDC |
| Operational Temperature Range | 0-70°C |
| Power Supply Voltage | 8-40 VDC |
| Loop Impedance (Max) | 200 Ohms at 12 VDC |
| Response time | 95% < 180 seconds |
| Pressure Range | 0-70 psi |
| Wetted Materials | 316 Stainless Steel, Delrin®, Viton™, Teflon®, epoxy |
| Length | 14.25 in (36.20 cm) |
| Width | 0.750 in (1.9 cm) maximum |
| Weight (No cable) | 0.50 lbs (0.227 kg) |
| Linearity | ± 0.5% of full scale* |
| Accuracy | ± 2.0% of full scale* |
| Sensitivity | ± 0.05% of full scale |
| Stability | ± 2.0% of full scale |
| Repeatability | ± 1.0% of full scale |
Temperature Sensor
| Output | 4-20 mA |
| Temperature Range | 0-50°C |
| Accuracy | +/- 1°C |
| Linearity | +/- 0.5°C |
| Power Supply Voltage | 7-40 VDC |
Cable
| Cable Material | Polyurethane |
| Type | 4 conductor, Kevlar® reinforced, water blocked, shielded, twisted-pair wiring |
| Maximum Distance | 3 miles |
| Resistance per 1000 ft (304.8 m) | 26 Ohms |
| Replaceable? | Yes |
*After proper calibration
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