With over 40 years in the water quality business and customers like IBM, Seimens, and Lawrence-Livermore Berkeley Labs, pHionics has the experience and products you need to succeed.
The D-pHi Series™
4-20 mA Differential pH Sensor
Only $549 USD
Applications
Recommended for process control, wastewater, aquaculture, hydroponics, environmental remediation, and other applications requiring extremely stable, user-friendly, and low-maintenance pH monitoring.
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Business hours:
9 am to 5 pm PST – Monday through Friday
Features
- Linear 4-20 mA output
- Simple to use and easy to calibrate
- Accurate over long distances
- Compatible with wide variety of dataloggers, PLCs, SCADA, and IoT systems.
- 2-wire connection with Reversible Input Protection
- 600 VDC electrical isolation
- Differential electrode technology (Click to learn more)
- Refillable electrode that never needs replacement
- 1-min refill procedure every 1-2 months for continuous reliable performance
- Reduces the need for frequent calibration checks and recalibrations, leading to lower maintenance overall
- Estimated maintenance cost of $36-85 USD per year
- Click to view Reference Refill Kit
- Chemical-resistant titanium and Delrin® housing (PVDF available)
- Built-in 0-50°C temperature sensor (secondary 4-20 mA output)
- 3/4″ or 1″ NPT backend (depending on model)
- Fully submersible to 100 psi and 150°F
- Dry storage
- Automatic Temperature Compensation (ATC)
Submersion |
Standpipe |
Inline |
Additional Resources
pH Sensor
| pH Range | 0-14 pH |
| Output | 4-20 mA | 2-wire |
| Electrode Type | Differential |
| Wetted Materials | Delrin®, titanium, glass, Viton™ |
| Operational Temperature Range | 32-155°F (0-70°C) |
| Thread Type | 3/4 inch MNPT or 1 inch MNPT |
| Max Flow Rate | 10 ft per second |
| Pressure Range | 0-100 psi |
| Automatic Temperature Compensation | 32-155°F (0-70°C) |
| Power Supply Voltage | 8-40 VDC |
| Warm-up Time | 2 seconds |
| Response time | 96% < 5 seconds |
| Length | 9.25 in (23.5 cm) |
| Width | 1.00 in (2.54 cm) max. |
| Weight (No cable) | 0.50 lbs (0.227 kg) |
| Linearity | ±0.014 pH* |
| Accuracy | ±0.014 pH* |
| Sensitivity | ±0.01 pH |
*After proper calibration
Cable
| Cable Material | Polyurethane |
| Type | Kevlar® reinforced, water blocked, shielded, twisted-pair wiring |
| Maximum Distance | 3 miles |
| Resistance per 1000 ft (304.8 m) | 26 Ohms |
| Replaceable? |
No |
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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