Industrial pH Sensor for Water Quality & Smart Agriculture Monitoring
The Seeed Studio S-pH-01A is a professional industrial-grade pH sensor designed for precise pH monitoring in water, soil and liquid-based environmental applications. It accurately measures pH values in the range of 0–14 pH, making it suitable for agriculture, hydroponics, aquaponics, water treatment and industrial monitoring applications.
The sensor supports both RS485 MODBUS-RTU communication and 4–20mA current output, allowing seamless integration with PLCs, RTUs, IoT gateways, industrial controllers and data loggers. This makes it highly versatile for industrial automation and remote monitoring systems.
The S-pH-01A uses advanced solid dielectric technology and a large-area PTFE liquid junction, reducing clogging and ensuring long-term stable performance with minimal maintenance. The integrated ATC (Automatic Temperature Compensation) improves measurement accuracy under varying environmental temperatures.
With wide supply voltage support (3.6–30V DC) and industrial-grade protection, the sensor is built for long-term use in harsh environments. Its robust design ensures reliable operation in agriculture, wastewater treatment, swimming pools and environmental sensing applications.
Key Features
✔ Industrial pH Sensor
✔ pH Range: 0–14
✔ RS485 MODBUS-RTU Interface
✔ 4–20mA Current Output
✔ Automatic Temperature Compensation (ATC)
✔ High Accuracy & Fast Response
✔ Anti-Clogging Probe Design
✔ Low Power Consumption
✔ Wide 3.6–30V DC Supply
✔ Easy Integration with PLC / RTU / Gateway
✔ Suitable for Long-Term Monitoring
✔ Ideal for Water Quality Monitoring
Typical Specifications
• Interface: RS485 MODBUS-RTU
• Analog Output: 4–20mA
• pH Range: 0–14 pH
• Resolution: 0.01 pH
• Accuracy: ±0.1 pH
• Power Supply: 3.6–30V DC
• Current Consumption: Max 6mA @ 24V
• Operating Temperature: -40°C ~ +85°C
• Cable Length: 5m
• Weight: 400g
Applications
Water Quality Monitoring
Smart Agriculture
Hydroponics
Aquaponics
Wastewater Treatment
Swimming Pools
Industrial Monitoring
Environmental Monitoring
Scientific Research
Specifications
General
- Model: S-pH-01A
- Sensor Type: Industrial pH Sensor
- Interface: RS485
- Protocol: MODBUS-RTU
- Analog Output: 4–20mA
pH Measurement
- Range: 0–14 pH
- Resolution: 0.01 pH
- Accuracy: ±0.1 pH
Electrical
- Supply Voltage: 3.6–30V DC
- Current Consumption: Max 6mA @ 24V
Mechanical
- Cable Length: 5m
- Weight: 400g
- Installation: Soil / Water / Liquid Media
Product Downloads
- Model: S-pH-01A
- Interface: RS485 MODBUS-RTU
- Analog Output: 4–20mA
- pH Range: 0–14 pH
- Resolution: 0.01 pH
- Accuracy: ±0.1 pH
- Supply Voltage: 3.6–30V DC
- Cable Length: 5m
















