SENSIRION SCD4 Series Manual

SCD4x
Breaking the size barrier in optical CO
Features
Photoacoustic NDIR sensor technology PASens®
▪
Small form factor: 10.1 x 10.1 x 6.5 mm
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▪ Reflow solderable for cost-effective assembly
Digital I C interface
▪
2
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Integrated temperature and humidity sensor
Product Summary
The SCD4x is Sensirion's second generation series of
optical CO sensors. The sensor series builds on the
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photoacoustic NDIR sensing principle and Sensirion's
patented PASens® and CMOSens® technology to offer
high accuracy at an attractive price and small form factor.
SMD assembly allows cost- and space-effective
integration of the sensor combined with maximal freedom
of design. On-chip signal compensation is realized with
the built-in SHT4x humidity and temperature sensor.
Product Overview
Products Details
SCD40-D-R2 Base accuracy, specified range
400 – 2'000 ppm
SCD41-D-R2 Improved accuracy, specified range
400 – 5'000 ppm, single shot operation
feature
SCD43-D-R2 High accuracy, specified range
400 – 5'000 ppm, comprehensive building
standard compatibility, single shot
operation feature
1 2 3 4
1
WELL v2, Q4 2024
2
2022 California Building Energy Efficiency Standards for Residential and Nonresidential Buildings
3
RESET Air Standard v2.0 Grade B
4
ASHRAE 62.1-2022 incl. Addendum d
www.sensirion.com
sensing
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Product Variants
SCD40: Base accuracy, specified measurement range
▪
400 – 2'000 ppm, compatible with WELL Building
3
Standard™
▪ SCD41: Improved accuracy, specified measurement
range 400 – 5'000 ppm, additionally compatible with
California Title 24
operation mode
▪ SCD43: High accuracy, specified measurement range
400 – 5'000 ppm, additionally compatible with
ASHRAE Standard 62.1
operation mode
CO is a key indicator for indoor air quality (IAQ), as high
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levels compromise human cognitive performance, sleep
quality, well-being and can be an indicator for increased
airborne disease transmission risk. The SCD4x enables
smart ventilation and air conditioning to help improve
energy efficiency and human comfort. Moreover, indoor
air quality monitors and other connected devices based
on the SCD4x can help maintain low CO
for a healthy, productive environment.
Functional Block Diagram
Version 1.7 – April 2025
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and RESET , features single-shot
2 ® 3
, features single-shot
4
concentrations
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