RS485 Modbus Water Quality pH Sensor (IP68)
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Description
The RS485 Modbus Water Quality pH Sensor (IP68) is an industrial-grade probe engineered for continuous, accurate liquid pH monitoring in demanding environments. Built with automatic temperature compensation and standard Modbus-RTU communications, it is ideal for makers, IoT developers, and educators working on automated environmental monitoring, smart agriculture, or aquaculture systems.
High-precision full-range measurement
The sensor measures pH levels across a full 0 to 14 pH range with 0.01 pH resolution, ±0.15 pH accuracy, and a fast response time under one second. Its integrated housing and probe design ensure repeatable readings with an error margin of just ±0.02 pH.
Modbus-RTU interface and temperature compensation
Equipped with an RS485 interface running standard Modbus-RTU, the sensor enables reliable long-distance data transmission for Arduino and LoRaWAN setups. An integrated temperature sensor provides Automatic Temperature Compensation across 0°C to 60°C to maintain accuracy during ambient fluctuations.
Submersible IP68 waterproof housing
Constructed from corrosion-resistant plastic with an IP68 ingress protection rating and 0.6MPa pressure resistance, the probe is built for extended continuous underwater submersion. It includes a 5-metre cable and is well suited for weakly acidic, weakly alkaline, and non-corrosive aqueous environments.
Pre-calibrated with field maintenance supplies
Factory calibration allows immediate out-of-the-box deployment without secondary tuning. The package includes three standard buffer powders (pH 4.01, 6.86, and 9.18) and 100ml of 3.3mol/L KCl protective solution to support periodic two-point register recalibration over long-term use.
Flexible supply and operating parameters
Operating on a wide 10V to 30V DC supply with a low 0.4W power consumption, the module integrates smoothly into industrial and battery-backed field systems. It functions reliably across an operating temperature range of 0°C to 80°C.
Downloads & documentation
Specifications
| Power Supply Voltage | 10~30V DC |
| Power Consumption | 0.4W |
| Communication Interface | RS485 (Standard ModBus-RTU protocol) |
| pH | 0~14 pH |
| Temperature | 0°C~+60°C |
| Repeatability Error | ±0.02 pH |
| Temperature Compensation Range | 0°C~+60°C |
| Response Time | ＜1S |
| Operating Temperature | 0°C~+80°C |
| Waterproof Rating | IP68 |
| Pressure Resistance | 0.6MPa |
| Cable Length | 5m |
| Housing Material | Corrosion-resistant plastic |
In the box
| RS485 Water Quality pH Sensor | 1 |
| 5m sensor cable | 1 |
| Electrode protective solution 100ml (3.3mol/L KCl) | 1 |
| pH 4.01 buffer powder | 1 |
| pH 6.86 buffer powder | 1 |
| pH 9.18 buffer powder | 1 |
| Black protective mesh | 1 |
| Cable ties | 2 |
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