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2

Humidity and Temperature Sensor Specifications

Every SHT41A-AWSB is individually tested and calibrated and is identifiable by its unique serial number (see

section 4.6 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.

2.1 Relative Humidity

Parameter

Conditions

Value

Units

SHT41A RH accuracy

typ.

2

%RH

max.

See Figure 2

-

Repeatability1

high

0.08

%RH

medium

0.15

%RH

low

0.21

%RH

Resolution2

-

0.01

%RH

Hysteresis

At 25°C, 50%RH

0.8

%RH

Specified range3

extended4

0 to 100

%RH

Response time5

t63%

4

s

Long-term drift6

typ.

<0.20

%RH/y

Table 1. General relative humidity sensor specifications.

Figure 2. SHT41A typical and maximal relative

humidity accuracy at 25 °C.

1

The stated repeatability is 3 times the standard deviation (3σ) of multiple consecutive measurement values at constant conditions and

is a measure for the noise on the physical sensor output. Different repeatability commands are listed in Table 7.

2

Resolution of A/D converter.

3

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

4

For details about recommended humidity and temperature operating range, please refer to section 2.4.

5

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.

6

Typical value for operation in normal RH/T operating range. Max. value is <0.5 %RH/y. Value may be higher in environments with

vaporized solvents, out-gassing tapes, adhesives, packaging materials, etc. For more details, please refer to the document Handling

Instruction for Humidity and Temperature Sensors [1].

±0

±2

±4

±6

±8

0

10 20 30 40 50 60 70 80 90 100

Relative Humidity (%RH)

SHT41A typ

SHT41A max

RH (%RH)