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Version 1

– December 2022

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1 Humidity and Temperature Sensor Specifications

Every SHT33 is individually tested and calibrated and is identifiable by its unique serial number

(see section 4.11 for details on the serial number). For the calibration, Sensirion uses transfer

standards, which are subject to a scheduled calibration procedure. The calibration of the reference,

used for the calibration of the transfer standards, is NIST traceable through an ISO/IEC 17025

accredited laboratory.

1.1 Relative Humidity

Parameter

Conditions

Value

Units

SHT RH accuracy1

typ.

2

%RH

max.

see Figure 1

-

Repeatability2, 3

high

0.08

%RH

medium

0.15

%RH

low

0.21

%RH

Resolution4

Typ.

0.01

%RH

Specified range5

extended6

0 to 100

%RH

Response time7

������63%

88

s

Long-term drift9

typ.

<0.25

%RH/y

Table 1. General relative humidity sensor specifications.

Figure 1. Maximal and typical tolerance of RH at 25°C

1 For definition of typ. and max. accuracy, please refer to the document “Sensirion Humidity Sensor Specification Statement”. [6]

2 The stated repeatability is 3 times the standard deviation (3σ) of multiple consecutive measurements at the stated repeatability and at constant ambient

conditions. It is a measure for the noise on the physical sensor output. Different measurement modes allow for high/medium/low repeatability

3 Valid for 25 °C and 50 %RH.

4 Resolution of A/D converter.

5 Specified range refers to the range for which the humidity or temperature sensor specification is guaranteed.

6 For details about recommended humidity and temperature operating range, please refer to section 1.3.

7 Time for achieving 63% of a humidity step function, measured at 25 °C and 1 m/s airflow. Humidity response time in the application depends on the design-in of

the sensor.

8 With activated ART function (see section 4.7 ) the response time can be improved by a factor of two.

9 Typical value for operation in normal RH/T operating range. Value may be higher in environments with vaporized solvents, out-gassing tapes, adhesives, pacore

details please refer to Handling Instructions. [4]

±0

±2

±4

±6

±8

0

10

20

30

40

50

60

70

80

90 100

Relative Humidity (%RH)

maximal tolerance

typical tolerance

DRH (%RH)