SHTW2 datasheet(2/14 Pages) ETC2

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Version 2 – August 2016

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1 Humidity and Temperature Sensor Specifications

Relative Humidity

Parameter

Conditions

Value

Units

Accuracy tolerance1

Typ.

3.0

%RH

Max.

see Figure 2

%RH

Repeatability2

0.1

%RH

Resolution3

0.01

%RH

Hysteresis

1

%RH

Specified range4

extended5

0 to 100

%RH

Response time6

 63%

Long-term drift7

Typ.

<0.25

%RH/y

Table 1 Humidity sensor specifications.

Figure 2 Typical and maximal tolerance for the relative humidity

in %RH at 25 °C.

1 For definition of typ. and max. accuracy tolerance, please refer to the

document “Sensirion Humidity Sensor Specification Statement”.

2 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.

3 Resolution of A/D converter.

4 Specified range refers to the range for which the humidity or temperature

sensor specification is guaranteed.

5 For details about recommended humidity and temperature operating range,

please refer to section 1.1.

6 Time for achieving 63% of a humidity step function, valid at 25°C and 1 m/s

airflow. Humidity response time in the application depends on the design-in of

the sensor.

7 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 Handling Instructions.

Temperature

Parameter

Conditions

Value

Units

Accuracy tolerance1

Typ.

0.4

°C

Max.

see Figure 3

°C

Repeatability2

0.1

°C

Resolution3

0.01

°C

Specified range4

–30 to +100

°C

Response time8

 63%

<5 to 30

Long-term drift9

Normal range

<0.02

°C/y

Table 2 Temperature sensor specifications.

Figure 3 Typical and maximal tolerance for the temperature

sensor in °C.

8 Temperature response time depends on heat conductivity of sensor substrate

and design-in of sensor in application.

9 Typical value for operation in normal T operating range. Max. value is <

0.04°C/y.

±0

±2

±4

±6

±8

±10

90 100

ΔRH [%RH]

Relative humidity [%RH]

Maximal tolerance

Typical tolerance

±0

±0.5

±1

±1.5

±2

-30

-10

ΔT [

C]

Temperature [°C]

Maximal tolerance

Typical tolerance

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