Full Features List
- 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) Â
- Reversible Input Protection and Operation Â
- 2-second warm-up time
- Lowest power usage compared to other 4-20 mA pH sensors
- Isolated to prevent ground loops Â
- Signal conditioning to remove background noise Â
Low Maintenance
The weak point of pH sensors is their reference electrolyte, which gets diluted by the sample over time.  STs Series pH sensors mitigate this problem by incorporating a reference half cell with a large electrolyte reservoir.  In addition, the electrolyte is solidified into a gel and two Teflon™ junctions are used to further slow dilution.
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™.
Vitonâ„¢ is a trademark of Chemours.
Resources
Related Products
STs Series Conductivity Sensor
STs Series Dissolved Oxygen Sensor
