SEK-SCD41 Evaluation Kit
The SEK-SCD41 has been designed for easy evaluation ofthe SCD41 CO2 sensor. In addition to the SCD41 development board, the evaluation kit includes two cable sets.
The “adapter cable” allows you to connect to a computer
via the SEK-SensorBridge, which must be bought separately and can be ordered via one of our distribution partners. Sensirion’s SEK-ControlCenter viewer software canbe used for evaluating the sensor. In addition, the kit
includes a jumper cable that enables fast prototyping,e.g., through integration into existing platforms (like Arduino, RaspberryPi, etc.). The software and relevant documentation can be downloaded from our website.
Learn more: www.sensirion.com/my-scd-ek

Environmental sensing
Environmental conditions have a major impact on our well-being, comfort, and productivity. Sensirion’s sensor solutions
provide detailed and reliable data on key environmental parameters such as humidity, temperature, volatile organic compounds (VOCs), particulate matter (PM2.5), formaldehyde, NOx and CO2. Environmental sensing opens up new possibilities to create smarter devices that improve our comfort and well-being as well as increase energy efficiency in a wide
variety of applications. We accompany you through the entire product development process, from the initial idea to product launch and beyond. Our expertise ranges from prototype construction, design-in support and use-case development
to inline testing at the mass production stage.

www.sensirion.com/scd4x

SCD4x Carbon Dioxide Sensor
Breaking the size barrier in CO2 sensing

SCD4x Carbon Dioxide Sensor
Description:
The SCD4x is Sensirion’s next-generation miniature CO2 sensor.
Based on the photoacoustic NDIR sensing principle and Sensirion’s patented PASens® and CMOSens® technology, it offers
high accuracy at an unbeatable price with the smallest formfactor. The SMD assembly allows cost- and space-efficient integration of the sensor with maximal design freedom. The integrated SHT4x humidity and temperature sensor provides
on-chip signal compensation. The sensor’s tape and reel packaging makes the SCD4x ideal for high-volume applications.
The SCD40 of the SCD4x product family provides accurate CO2 sensing over a concentration range of 400 – 2,000 ppm
and is ideal for cost-sensitive applications. For low power and indoor air quality applications, the SCD41 offers several
important features, such as a specified CO2 accuracy range from 400 – 5,000 ppm, higher accuracy specifications andlow-power measurement modes. Applications requiring compliance with IAQ standards – such as RESET®, WELL Building Standard™ and California Title 24 Building Energy Efficiency Standards – are well served by the SCD41.
CO2 is a key indicator for IAQ, as high levels affect c ognitive p erformance a nd well-being. T he S CD4x e nables s martventilation systems to regulate ventilation in the most energy-efficient way. In addition, IAQ monitors and other connected
devices based on the SCD4x help maintain low CO2 concentrations for a healthy and productive environment.

Applications
The SCD4x is perfectly suited for a wide range of commercial and residential HVAC applications:

Air handling unit/Heat recovery unit

Wall-mount CO2 sensor
Duct-mountCO2 sensor

Air purifier

Air conditioner
Air exchanger

Thermostat

Air quality
monitoring device

NDIR vs. photoacoustic sensing technology
FeaturesTypical NDIR CO2 Sensor

SCD4x CO2, RH + T Sensor

High selectivity
Small size
Additional sensor outputs
Cost-effective assembly
Mechanical robustness
Cost-effective BOM

TechnologyBenefits

Proprietary sensing technologies

Highest accuracy in smallest form factor

Small footprint

Fits into every device

Low number of components

High reliability

Long sensor lifetime of >10 years

Reliable sensor hardware

Voltage range of 2.4 – 5.5 V

Flexibility for battery and wired applications

Automatic self-calibration (ASC)

Enable autonomous drift compensation

Multiple low power modesPotential for battery-powered applications

SMD soldering, tape & reel packaging

Straight-forward design-in

Built-in humidity and temperature sensor

On-chip signal compensation

Digital I2C interface

Simple sensor communication

Sensor Specifications

Measurement accuracy ¹CO2 output range
Minimum sampling rate
Response time (τ63%)
Size

SCD40

SCD41± (50 ppm + 5% of reading)@ 400 – 2,000 ppm± (50 ppm + 2.5% of reading) @ 400 – 1,000 ppm± (50 ppm+ 3% of reading) @ 1,001 – 2,000 ppm± (40 ppm+ 5% of reading) @ 2,001 – 5,000 ppm

0 – 40,000 ppm
5s
60 s
10.1 × 10.1 × 6.3 mm³Assembly

SMD

Interface

I2C

Lifetime>10 years

Supply voltage range

2.4 – 5.5 V

Average current for periodic mode

3.3 V = 15 mA, 5 V = 11 mA

Temperature operating conditions–10 to 60 °C

Humidity operating conditions 20 – 95% RH

Rough handling, shipping and sensor assembly can temporarily impact the accuracy. Accuracy can be fully restored through the forced recalibration (FRC) or ASC
algorithms at least 5 days after sensor assembly. Please see the datasheet for more information.
2 Accuracy can be reduced at relative humidity levels below 10%. Please see the datasheet for more information.
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