www.sensirion.com / D1

Version 7.1 – March 2025

8 / 24

2.4 ISO17025 certification with 3-point calibration data

All SHT43 can be uniquely identified by their serial number (read out command see paragraph 4.7). For each

sensor an individual 3-point calibration is performed, accredited to ISO/IEC 17025:2017. The accreditation is

performed and granted by the Swiss Accreditation Service (SAS), a public institution of the Swiss

Government. The accreditation is documented on the SAS website under the name SCS 0158 and can be

downloaded from this link14. The three calibration temperatures are T = −30 °C, T = 5 °C, and T = 70 °C.

Measurement uncertainties and decision rules according to the SAS are given in Table 3. Metrological

traceability of the calibration is in accordance to ch. 6.5 of ISO/IEC 17025:2017, encompassing but not limited

to NIST traceability or traceability to other national metrology institutes, according to the CIPM Mutual

Recognition Arrangement (CIPM MRA). Reel-wise calibration certificates and data for each SHT43 can be

downloaded from libellus.sensirion.com. This allows for efficient processing by automated systems.

Temperature

Expanded measurement uncertainty (k=2)*

Decision rule

−30 °C

0.40 °C

Shared risk (JCGM 106:2012, 8.2)

5 °C

0.20 °C

Shared risk (JCGM 106:2012, 8.2)

70 °C

0.20 °C

Shared risk (JCGM 106:2012, 8.2)

Table 3. Measurement uncertainty and decision rule for the accredited calibration according to Swiss

Accreditation Service (SAS). *Measurement uncertainties represent a confidence level of 95% using a

coverage factor of k = 2.

For more information on how Sensirion being the first ISO17025 certified Semiconductor company affects

the design of certified tracking find the document Sensirion Certified Smart Tracking on our website

www.sensirion.com.

2.5 Design In

The above-mentioned specifications hold for the stand-alone sensing element. To achieve the best

performance please consult the Design-in guide SHT [1] on our website Sensirion.com.

14

https://www.sas.admin.ch/sas/en/home/akkreditiertestellen/akkrstellensuchesas.exturl.html/aHR0cHM6Ly9zYXNkYi5jbGllbnRzLmxpaXAuY2gvc2VhcmNoL

m/h0bWw=.html?csrfmiddlewaretoken=2Ie2f1aOTUge9YQ3nuaL0ILEYS980ZMdH60doLdY8Nh1sHC3wpw3YvLLVBezmDRn&lang=en&search_term=0158&a

ccreditation_type=2&submit=Start+search