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Version 1.1 – April 2021

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1 Sensor Performance

Default conditions of 25 °C, 50 % RH, ambient pressure 1013 mbar, default periodic measurement and 3.3 V supply voltage

apply to values in the table below, unless otherwise stated.

Parameter

Conditions

Value

-

0 – 40’000 ppm

400 ppm – 2’000 ppm

± (50 ppm + 5% of reading)

400 ppm – 5’000 ppm

± (40 ppm + 5% of reading)

Repeatability

Typical

± 10 ppm

60 s

Accuracy drift per year with automatic self-

Typical

± (5 ppm + 0.5 % of reading)

Parameter

Conditions

Value

Humidity measurement range

-

0 %RH – 100 %RH

Accuracy (typ.)

15 °C – 35 °C, 20 %RH – 65 %RH

± 6 % RH

-10 °C – 60 °C, 0 %RH – 100 %RH

± 9 % RH

Repeatability

Typical

± 0.4 %RH

Response time3

90 s

Accuracy drift

-

< 0.25 %RH / year

Table 2: SCD4x humidity sensor specifications

1.3 Temperature Sensing Performance5

Parameter

Conditions

Value

Temperature measurement range

-

- 10°C – 60°C

Accuracy (typ.)

15 °C – 35 °C

± 0.8 °C

-10 °C – 60 °C

± 1.5 °C

Repeatability

-

± 0.1°C

Response time3

120 s

Accuracy drift

-

< 0.03 °C / year

Table 3: SCD4x temperature sensor specifications

1

2

Deviation to a high-precision reference. Accuracy is fulfilled by > 90% of the sensors after calibration. Rough handling, shipping and soldering reduces the accuracy of the

sensor. Accuracy is restored with FRC or ASC recalibration features. Accuracy is based on tests with gas mixtures having a tolerance of ± 1.5%.

3

Time for achieving 63% of a respective step function when operating the SCD41 Evaluation Kit with default measurement mode. Response time depends on design-in,

signal update rate and environment of the sensor in the final application.

4

from stress tests is ± (5 ppm + 2 % of reading). Higher drift values may occur if the sensor is not handled according to its handling instructions.

5

Design-in of the SCD4x in final application, self-heating of the sensor and the environment impacts the accuracy of the RH/T sensor. To realize indicated specifications, the

temperature-offset of the SCD4x inside the customer device must be set correctly (see chapter 3.6). Best RH/T accuracy is realized when operating the SCD4x in low power

periodic measurement mode.