DFRobot
DFRobot RS485 Modbus IP68 Water Quality pH Sensor
· MPN: SEN0708
This industrial-grade water quality sensor is designed for continuous pH monitoring in demanding environments. Its integrated probe and housing provide a rob...
This industrial-grade water quality sensor is designed for continuous pH monitoring in demanding environments. Its integrated probe and housing provide a robust, streamlined setup for measuring pH in non-corrosive, weakly acidic and weakly alkaline water.
The sensor communicates over RS485 using the standard Modbus-RTU protocol, making it suitable for IoT networks, automated monitoring systems and long-distance data transmission. Documentation and tutorials are available for Arduino development boards and DFRobot LoRaWAN projects.
A built-in temperature component provides Automatic Temperature Compensation (ATC), while factory calibration lets the sensor operate out of the box without initial secondary calibration. For longer-term maintenance, it supports two-point electrode calibration via register settings and includes pH 4.01, 6.86 and 9.18 buffer powders.
The package includes the RS485 Water Quality pH Sensor, 5m sensor cable, 100ml electrode protective solution (3.3mol/L KCl), pH 4.01 buffer powder, pH 6.86 buffer powder, pH 9.18 buffer powder, black protective mesh and two cable ties. White KCl crystals around the protective cap can occur normally; brush them back into the protective liquid if present.
Features:
- Robust Communication: RS485 interface supporting standard ModBus-RTU protocol for reliable, long-distance data transmission.
- Industrial Durability: Integrated probe housing design featuring an IP68 waterproof rating, enabling extended continuous submersion.
- High Precision: Wide measurement range (0-14 pH) with a resolution of 0.01 pH and an accuracy of ±0.15 pH.
- Automatic Temperature Compensation (ATC): Built-in temperature sensor mitigates environmental fluctuations to ensure strict measurement accuracy.
- Developer Friendly: Functions seamlessly as a pH sensor for arduino with full tutorial support.
- Simplified Maintenance: Factory calibrated out-of-the-box, with built-in support for two-point electrode calibration.
Specifications:
- Power Supply Voltage: 10~30V DC
- Power Consumption: 0.4W
- Communication Interface: RS485 (Standard ModBus-RTU protocol)
- Measurement Range pH: 0~14 pH
- Measurement Range Temperature: 0°C~+60°C
- Measurement Accuracy pH: ±0.15 pH
- Measurement Accuracy Temperature: ±0.5°C
- Resolution pH: 0.01 pH
- Resolution Temperature: 0.1°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
Well suited to aquaculture and hydroponics, wastewater and effluent treatment, environmental surface and groundwater monitoring, smart agriculture and IoT environmental setups.
Jargon buster
Plain-language definitions for the technical terms used above.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- Modbus
- Modbus is an industrial communication protocol used by many meters, sensors, PLCs, and automation devices. Modbus support matters because it can make the controller easier to integrate with existing industrial equipment.
- ModBus-RTU
- ModBus-RTU is a common industrial protocol for sending sensor readings and control commands over serial links such as RS485. Knowing the sensor uses ModBus-RTU helps you choose software libraries, data loggers, or controllers that can request and interpret its readings.
- pH
- A measure of how acidic or alkaline a liquid is, on a scale where 7 is neutral. For a water monitoring kit, pH tells you about water chemistry and whether the included probe matches the range and accuracy your project needs.
- RS485
- RS485 is a robust wired serial communication standard often used in factories, farms, and buildings where cables may be long or electrically noisy. It matters because it lets this controller connect to industrial sensors, meters, and control equipment over longer distances than typical hobby serial wiring.
- Temperature compensation
- Temperature compensation means the sensor adjusts its readings to reduce errors caused by changes in water temperature. This matters for field monitoring because ponds, rivers, and tanks can vary in temperature throughout the day and across seasons.
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Sensors & Input
Supplier page — dfrobot.com
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