pHionics STs Series pH Water Quality Sensor
- In stock, ready to ship
- Available to order
The pHionics STS Series pH sensor is meticulously engineered to meet your monitoring and control needs. Low maintenance operation, rugged materials & seals, and ground loop elimination all come standard. Just plug two wires into a HOBO RX3000, or any other pH monitoring/control system that accepts 4-20 mA inputs and enjoy years of hassle-free operation.
| Measurements | pH, Water Temperature |
|---|
Specifications
pH Sensor
| Output | 4-20 mA |
| pH Range | 0-14 pH |
| Operational Temperature Range | 0-70°C |
| Electrode Type | Silver/silver chloride, double junction, replaceable gel electrode |
| Transmitter Type | 2-wire |
| Pressure Range | 0-70 psi |
| Automatic Temperature Compensation | 0-70°C |
| Isolation | 600 VDC |
| Power Supply Voltage | 8-40 VDC |
| Warm-up Time | 2 seconds |
| Response time | 95% < 5 seconds |
| Wetted Materials | 316 Stainless Steel, Delrin®, Viton™, glass, 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 | ±0.014 pH* |
| Accuracy | ±0.014 pH* |
| Sensitivity | ±0.01 pH |
| Stability | ±0.03 pH per year |
| Repeatability | ±0.01 pH |
*After proper calibration
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 |
pHionics products comply fully with all applicable EU Directives to bear the CE Mark.
Delrin® and Kevlar® are registered trademarks of DuPont™.
Viton™ is a trademark of Chemours.
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The STs Series pH water quality sensor makes your job easier by providing years of trustworthy pH and temperature data via noise-resistant 4-20 mA signals.
The sensor has a large, double junction reference electrode for stable measurements over long periods of unmanned operation. In addition, the noise-reduction technology prevents ground loops and other forms of electrical interference for consistently accurate measurements.
A narrow diameter (0.75” or 1.9 cm) and fully sealed, submersible design allows the sensor to go anywhere you need to collect data while the durable, chemicalresistant housing and Kevlar-reinforced cable ensure many years (10+) of operation, even in polluted environments.
Key Features
- Large gel-filled, double-junction electrode providing stable 0-14 pH measurements for long periods of time
- Durable, chemical-resistant housing and cable
- Combination double-junction electrode with large reference reservoir
- Built-in 0-50°C temperature sensor (2nd channel)
- Chemical-resistant Delrin®, PVDF, and 316 Stainless Steel housing (Titanium optional)
- True 2-wire sensor for simple installation
- Solution ground
- Narrow diameter (0.75 inches or 1.9 cm)
- Removable electrode guard
- 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)
- Automatic Temperature Compensation (2% per degree Celsius)
- Reversible Input Protection and Operation
- 2-second warm-up time
- Lowest power usage compared to other 4-20 mA pH sensors
- Isolated to prevent electrical interference and protect connected devices
- Signal conditioning to remove background noise.
Applications
- Groundwater Monitoring
- Agricultural Run-off
- Mining Pollution
- Industrial Effluent Monitoring
- Wastewater Treatment
- Environmental Remediation
- Aquaculture.
Built-To-Last
With proper care, these sensors are designed for many years of reliable pH monitoring in harsh conditions. The truly unique aspect of the STs Series is that every part, including the cable, is easily replaceable in the event of wear/damage. This considerably extends their lifespan to save your company money. It also keeps waste out of landfills to support sustainable business practices.
Ground Loop Elimination
If you ever have a pH sensor sending erratic measurements and can’t figure out why, then there may be a “ground loop”. A ground loop occurs when the electrical circuit has multiple paths to ground that cause interference. This issue can be very difficult to detect and fix. The best way to avoid ground loops is with input/output electrical isolation, which is built into every pHionics sensor.
Low Maintenance
Very little is required to keep these sensors up. Just perform periodic calibrations and replace the electrode every few years. Electrode replacement is a 60-second procedure that is easily performed in the field without any tools.