Product Description:

YJJ SCD41 Photoacoustic CO2 Temperature Humidity Integrated Sensor for Indoor Air Monitoring

Features:

1. Core Parameters (25℃, 5V power supply)

1. CO₂ (Main Measurement)

Measurement Range: 400–5000 ppm (Can measure 0–40000 ppm, calibrated at 400–5000 ppm) Accuracy:

400–1000 ppm: ±(50 ppm + 2.5% reading)

1001–2000 ppm: ±(50 ppm + 3% reading)

2001–5000 ppm: ±(40 ppm + 5% reading)

Response time τ63: 60 s

Resolution: 0.1 ppm

2. Humidity (Integrated SHT4x)

Measurement range: 0–95% RH (no condensation)

Accuracy: ±6% RH (typical)

Response time τ63: 120 s

Resolution: 0.01% RH

3. Temperature (Integrated SHT4x)

Measurement range: -10°C ~ +60°C

Accuracy: ±0.8°C (typical)

Resolution: 0.01°C

4. Electrical and Interface

Power supply: 2.4–5.5 V (recommended 3.3V/5V)

Average current: 3.2–4 mA (5s period); low power consumption 0.5 mA (5min period)

Interface: I2C (address 0x62), digital output

Life: 10 years +, factory calibration, supports self-calibration ASC

II. Working Principle

CO₂ Detection (Photoacoustic NDIR): Infrared light source emits 4.26μm pulse → CO₂ molecules absorb → generate pressure wave (sound wave) → microphone detection → concentration conversion; strong anti-interference, long lifespan, no consumables required.

Humidity and Temperature Detection (SHT4x): CMOSens® chip, capacitive humidity + bandgap temperature, used for on-chip compensation of CO₂ signal, and outputs independent temperature and humidity data Sensirion.

III. Main Applications (Core Scenarios)

1. Indoor Air Quality (IAQ) Monitoring (Most Common)

Residential / Office / Classroom: Ventilation linkage when CO₂ > 1000 ppm, prevents drowsiness, enhances concentration

Fresh air system / Air conditioner: Dual control of CO₂ + temperature and humidity, energy-saving and comfortable

Smart Home: IoT devices, air purifiers, smart panels integration

2. Commercial and Construction

Shopping malls / Hotels / Conference rooms: CO₂ monitoring in densely populated areas, compliant with RESET®/WELL™/ California Title 24 standards

Archives / Museums: Stable control of temperature and humidity, protection of cultural relics

3. Agriculture and Horticulture

Greenhouses / Sheds: CO₂ (800–1500 ppm) + temperature and humidity synergy, improves crop yield

Plant incubators: Precise environmental control

4. Industrial and Portable Equipment

Portable gas analyzer: Compact, low power consumption, battery-powered for several months

Clean rooms / Laboratories: Low concentration CO₂ monitoring

Automobile cabin: HVAC air quality optimization

Specifications: