INFWIN ALS20-Ambient Light Sensor, Illuminance Transmitter

The INFWIN ALS20 is an ambient light sensor (illuminance transmitter) with RS485/Modbus-RTU, analog voltage, or analog current output. Each unit is individually calibrated for excellent accuracy and consistency. Illuminance range, power supply, output interface, and cable length are configurable via ordering code - the default variant (ALS20-FAC002) ships with a 0–200000 lux range, RS485/Modbus-RTU output, 3.9–30V DC supply, and a 2 m cable. A spring-loaded mounting bracket with a built-in level indicator makes it straightforward to install the sensor level and pointed skyward. Reverse power protection and built-in TVS/ESD protection are included. Key Features Individually calibrated: Each sensor calibrated at the factory for high accuracy and consistency across units Flexible output interface: RS485/Modbus-RTU, RS485 + analog voltage, RS485 + analog current, analog voltage 0–2V, analog current 4–20mA, or SDI-12 (see ordering code) Wide range of illuminance options: Six fixed full-scale ranges from 2000 lux up to 200000 lux, plus a customizable range Level indicator and spring-loaded mount: Simplifies accurate, level installation Weatherproof: IP66 rated for direct outdoor use Wide operating range: −40°C to +85°C Reverse power protection: Built-in TVS/ESD protection RS485 Modbus-RTU protocol: Standard Modbus register map; configurable slave address, baud rate, parity, and stop bits Configuration utility: SensorOneSet software included for sensor configuration via RS485 Cable length: 2 m standard; custom lengths available Applications Scientific research Solar power monitoring Greenhouse and horticultural lighting management Weather stations Important Notes Accuracy is ±5% for the 2000–100000 lux ranges and ±6% for the 200000 lux range. Directional (cosine) error increases sharply off-axis: ±3% at 30° incidence, ±6% at 60°, and ±24% at 80° - mount the sensor level for best accuracy. 4–20mA output requires 12–30V DC supply; the 3.9–30V DC and 2.7–16V DC supply options are not compatible with 4–20mA output. Mounts via three screw holes. Specifications Illuminance Range (selectable) 0–2000, 0–5000, 0–10000, 0–20000, 0–100000, or 0–200000 lux Resolution 1 lux Accuracy ±5% (2000–100000 lux ranges); ±6% (200000 lux range) Directional (cosine) error ±3% at 30°; ±6% at 60°; ±24% at 80° Output Interface (selectable) RS485 Modbus-RTU Default for ALS20-FAC002 Analog voltage 0–2V (output resistance ~0 Ω) Analog current 4–20mA (load resistor <500 Ω) SDI-12 Available as ordering option Power Supply (per output type) RS485 / Analog voltage 3.9–30V DC (7mA @ 24V DC) Analog current 4–20mA 12–30V DC (30mA @ 24V DC, with 20mA output signal) Low-power option 2.7–16V DC (not applicable for 4–20mA output) Mechanical Dimensions 75 × 55 × 58 mm IP rating IP66 Installation 3 × screw hole mounting, spring-loaded with level indicator Cable length 2 m standard; custom length available Environmental Operating temperature −40°C to +85°C Ordering Code Guide Code 1: Product Series ALS20 ALS20 ambient light sensor Code 2: Range A B C D E F G 0–2000 lux 0–5000 lux 0–10000 lux 0–20000 lux 0–100000 lux 0–200000 lux Customize Code 3: Power Supply A B 3.9–30V DC 2.7–16V DC Code 4: Output Interface A B C D E F G Analog Voltage 0–2V Analog Current 4–20mA RS485, Modbus-RTU RS485, Modbus-RTU + Analog Voltage 0–2V RS485, Modbus-RTU + Analog Current 4–20mA SDI-12 Customize Code 5: Cable Length 002 XXX 2 meters Custom (XXX = length in meters, e.g. 005 = 5 m) Default Variant: ALS20-FAC002 Illuminance range 0–200000 lux Power supply 3.9–30V DC Output interface RS485, Modbus-RTU Cable length 2 meters Custom variants (illuminance range, power supply, output interface, cable length) are available - contact us to discuss your requirements. Technical Documents User Manual SensorOneSet Configuration Utility Modbus is a registered trademark of Schneider Electric. SDI-12 is a trademark of the SDI-12 Support Group. INFWIN is a registered trademark of Dalian Endeavour Technology Co., Ltd. MCCI and MCCI Catena are registered trademarks of MCCI Corporation. All other trademarks are the property of their respective owners.