DFRobot
DFRobot Industrial RS485 ORP Sensor - IP68 ModBus-RTU
· MPN: SEN0709
This industrial-grade ORP (Oxidation-Reduction Potential) sensor is built for reliable water quality monitoring in demanding environments. Its integrated pro...
This industrial-grade ORP (Oxidation-Reduction Potential) sensor is built for reliable water quality monitoring in demanding environments. Its integrated probe and housing measure ORP from -1999 to 1999mV, with RS485 communication for connection into monitoring networks.
The sensor supports the standard ModBus-RTU protocol and is suited to Arduino development boards, DFRobot LoRaWAN systems, PLC-style setups and industrial IoT projects where long cable runs and robust communications are useful. It includes a built-in temperature sensor for automatic temperature compensation, helping keep readings stable as conditions change.
Each unit is factory calibrated for immediate deployment, with two-point electrode calibration supported via register settings for long-term maintenance. The IP68 waterproof design is rated for continuous submersion, making it suitable for swimming pool disinfection monitoring, aquaculture, wastewater and effluent treatment plants, and environmental monitoring systems.
Maintenance note: the probe’s protective cap contains 3.3mol/L KCl preservation liquid. Minor seepage around the cap may form white crystalline deposits; this is normal, does not affect lifespan or accuracy, and the crystals can be dissolved back into the protective liquid within the cap.
Features:
- Broad Measurement Range: Accurately reads from -1999 to 1999 mV with ±5 mV accuracy and 1 mV resolution.
- Industrial Durability: Integrated probe and housing with an IP68 waterproof rating, rated for continuous underwater operation.
- Automatic Temperature Compensation: Built-in temperature sensor ensures stable and reliable measurements regardless of environmental fluctuations.
- Standardized Communication: Features an RS485 interface utilizing the standard ModBus-RTU protocol for seamless industrial IoT integration.
- Ready to Deploy: Factory calibrated for immediate use; supports simple two-point electrode calibration for long-term accuracy maintenance.
Specifications:
- Power Supply Voltage: 10~30V DC
- Power Consumption: 0.4W
- Communication Interface: RS485 (Standard ModBus-RTU protocol)
- Measurement Range - ORP: -1999~1999mV
- Measurement Range - Temperature: 0°C~+60°C
- Measurement Accuracy - ORP: ≤±5mV (at 25℃, in 222mV standard solution)
- Measurement Accuracy - Temperature: ±0.5°C
- Resolution - ORP: 1mV
- Resolution - Temperature: 0.1°C
- 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
Includes RS485 Water Quality ORP Sensor x1, 5m sensor cable x1, Electrode protective solution 100ml (3.3mol/L KCl) x1, Black protective mesh x1 and Cable ties x2.
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.
- 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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Supplier page — dfrobot.com
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