DFRobot
RS485 Ultraviolet (UV) Intensity Measure Sensor (290-390nm, UVA, UVB)
· MPN: SEN0642
An industrial-grade RS485 UV sensor that measures ultraviolet intensity (0–15 mW/cm²) and UV index (0–15) across the 290–390 nm wavelength range, covering bo...
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An industrial-grade RS485 UV sensor that measures ultraviolet intensity (0–15 mW/cm²) and UV index (0–15) across the 290–390 nm wavelength range, covering both UVA and UVB bands. It communicates via the Modbus-RTU protocol over RS485, making it easy to integrate with Arduino and other microcontrollers using a TTL-to-RS485 adapter.
Housed in an IP67-rated metal aluminium shell, the sensor is built for long-term outdoor and industrial use. It operates on a wide DC 5–30V power supply and delivers readings with 0.01 mW/cm² resolution and a fast 0.2-second response time.
Key Features
- 290–390 nm Wavelength Range – Covers UVA and UVB bands
- UV Intensity and Index – Measures 0–15 mW/cm² intensity and 0–15 UV index
- RS485 Modbus-RTU – Standard industrial communication protocol
- IP67 Rated – Dust-tight and water-resistant aluminium housing
- Wide Voltage Input – DC 5–30V
- Fast Response – 0.2-second measurement time
Specifications
- Power Supply – DC 5–30V
- Working Current – <10 mA
- Output – RS485 (Modbus-RTU)
- UV Intensity Range – 0–15 mW/cm²
- Resolution – 0.01 mW/cm²
- Accuracy – ±10% FS (@ 365 nm, 60% RH, 25°C)
- UV Index Range – 0–15
- Wavelength Range – 290–390 nm
- Response Time – 0.2 s
- Operating Temperature – -25 to +60°C
- Protection Rating – IP67
- Sensor Cable – 20 cm
- Adapter Cable – 70 cm
Ideal For
- Environmental UV monitoring and climate studies
- Health protection and UV exposure tracking
- Agricultural crop growth monitoring
- Photovoltaic system assessment
- Laboratory UV research
Package Contents
- 1× RS485 UV Sensor
- 1× Adapter Cable
- 1× Screw Package
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- IP67
- An ingress protection rating meaning the enclosure is dust-tight and can survive temporary immersion in water under specified test conditions. This matters when choosing a sensor for outdoor, wet, or wash-down environments.
- Modbus
- Modbus is an industrial communication protocol used by many meters, sensors, PLCs and automation devices. When a product lists Modbus support, it is generally easier to integrate with existing industrial equipment that speaks the same protocol.
- ModBus-RTU
- ModBus-RTU is a common industrial protocol for sending readings and control commands over serial links such as RS485. Knowing a device uses ModBus-RTU helps you choose software libraries, data loggers, or controllers that can request and interpret its data.
- RS485
- RS485 is a robust differential serial communication standard often used in factories, farms and buildings where cables may be long or electrically noisy, and it can link many devices on a single pair of wires. When a product lists RS485, it can communicate with industrial sensors, meters and control equipment over longer distances than typical hobby serial wiring.
- Torque
- A twisting force that causes something to rotate, usually measured in newton-metres or kilogram-centimetres. It matters when choosing motors, servos, gears, and tools because higher torque is needed to lift heavier loads, turn larger wheels, or move mechanisms without stalling.
- UVA
- UVA is the longer-wavelength part of ultraviolet light, closest to visible violet light. Measuring it separately matters when you need to distinguish general UV exposure from the more energetic UVB and UVC bands.
- UVB
- UVB is a middle band of ultraviolet light that is more energetic than UVA and is important in sun exposure and plant-related UV monitoring. A sensor with a separate UVB channel lets you measure this band without it being mixed together with other UV light.
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