- +86 571 8501 2111
- fpi-online@fpi-inc.com
- 459 Qianmo Road, Binjiang District, Hangzhou, China
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The pH online sensor adopts the glass electrode method and features a corrosion-resistant housing. It is equipped with a built-in NTC temperature sensor for automatic temperature compensation, minimizing the impact of temperature on measurement accuracy. The sensor supports RS485 communication and the standard Modbus protocol.
The sensor collects the potential difference between the reference electrode and the glass hydrogen ion indicator electrode, as well as the resistance value from the thermistor to obtain the water temperature. Based on the Nernst equation, the potential is then converted into a pH value.
| Product Model | pH-200 | pH-210 | pH-230 |
| Operating Principle | Glass Electrode Method | Glass Electrode Method | Glass Electrode Method |
| Measuring Range | pH (0~14) | pH (0~14) | pH (0~14) |
| Repeatability | <0.1pH | <0.1pH | <0.1pH |
| Drift (24h) | <0.1pH | <0.1pH | <0.1pH |
| Resolution | 0.01pH | 0.01pH | 0.01pH |
| Response time | <10s | <10s | 30s |
| Protection rating | IP68 | IP68 | IP68 |
| Communication interface | RS485 communication with standard Modbus protocol; baud rates: 4800, 9600, 19200, 38400, 57600, 115200 | RS485 communication with standard Modbus protocol; baud rates: 4800, 9600, 19200, 38400, 57600, 115200 | RS485 communication with standard Modbus protocol; baud rates: 4800, 9600, 19200, 38400, 57600, 115200 |
| Size specifications | Φ33*224 mm, Cable length 10m(customizable) | Φ16*146 mm, Cable length 10m(customizable) | Φ12*350 mm |
| Material | Available options: 316L stainless steel / PVC / titanium alloy | 316L stainless steel/titanium alloy | 316L stainless steel |
| Weight | 0.5kg | 0.1kg | 0.2kg |
| Installation thread | Upper end: NPT 3/4 thread; lower end: optional NPT 3/4 external thread | Upper end top: M16 X 1 thread; Upper end bottom: M20 X 1.5 thread | VPB connector & PG13.5 thread |
| Operating voltage | (9~36) V DC | (9~36) V DC | (9~36) V DC |
| Power consumption | 0.2 W | 0.2 W | 0.2 W |
| MTBF | ＞1440h/time | ＞1440h/time | High-temperature sterilization 30 pcs |
| Calibration interval | 3 ~6 month | 3 ~6 month | 3 ~6 month |
| Operating environment | (0~50) °C | (0~50) °C | 0~130°C |
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