SenseCAP CO2, Temperature and Humidity Sensor with RS-485 & SDI-12

The SenseCAP CO₂, temperature, and humidity sensor is designed for reliable environmental monitoring in a range of indoor and outdoor settings such as greenhouses, urban infrastructure, farms, and transit stations. Using non-dispersive infrared (NDIR) technology, it provides accurate and continuous CO₂ concentration readings, alongside temperature and humidity, output via standard digital interfaces. The sensor supports both RS-485 (Modbus-RTU/ASCII) and SDI-12 communication protocols, making it compatible with most data acquisition devices and systems. With a wide 5–24V operating voltage range and low power consumption (down to µA in SDI-12 mode), it suits both fixed and mobile deployments. The built-in calibration functionality simplifies integration and maintenance, while optional manual calibration can be triggered via onboard keys or serial commands. Internally, the sensor features a single air chamber with a dual-channel setup, enhancing measurement reliability. It uses a PTFE breathable membrane with a protective enclosure, improving air permeability and ensuring stable long-term performance. With a small form factor, it is easy to install and connect to data loggers like the SenseCAP S2100 LoRaWAN Data Logger or Sensor Hub 4G Data Logger for remote access.

Features

* 3-in-1 sensor: Measures CO₂, air temperature, and relative humidity

* NDIR sensing principle with single-air-chamber, dual-channel design

* Supports RS-485 (Modbus-RTU / Modbus-ASCII) and SDI-12 protocols

* Wide power supply range: 5V to 24V

* Factory-calibrated with optional custom calibration via buttons or commands

* Low power consumption: µA-level current in SDI-12 mode

* CO₂ measurement range: 0 to 10,000 ppm

* CO₂ accuracy: ±(40 ppm + 3% of measured value)

* PTFE breathable membrane and protective housing for improved stability

* Compact, lightweight, and easy to install

* Compatible with SenseCAP S2100 LoRaWAN® and Sensor Hub 4G data loggers

* Suitable for use in greenhouses, cities, farms, and transit hubs

Specifications

Supply Voltage 5 ~ 24 V

Supporting Protocols Modbus -RTU RS485 / Modbus -ASCII RS485 / SDI-12 (v1.4)

IP Rating IP65 (shading measures are required for outdoor installation, and the equipment cannot be exposed to direct sunlight and rainwater for a long time)

Operating Temperature 0°C ~ +50°C (Due to CO₂ sensor limitations)

Working Humidity 0 ~ 95 %RH (no condensation)

Cable Length 2 meters

Measurement Parameters

Carbon Dioxide (CO₂) Range 0 ~ 10000 ppm

CO₂ Accuracy ±(50 ppm + 3% of measured value)

CO₂ Resolution 1 ppm

Air Temperature Range -40 ~ 85°C

Air Temperature Accuracy ±0.2°C

Air Temperature Resolution 0.01°C

Air Humidity Range 0 ~ 100 %RH

Air Humidity Accuracy ±1.8 %RH

Air Humidity Resolution 0.01 %RH

Resources

* Datasheet / Guide

Package Contents

* 1x SenseCAP CO2, Temperature and Humidity Sensor with RS485 & SDI-12

* 1x Mounting bracket

* 4x Self-drilling Screw - 2cm

* 3x Self-drilling Screw - 6mm