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Version 0.8 – January 2017

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1. Sensor Performance

1.1

Differential Pressure Specification1

Parameter

SDP31

SDP32

Measurement range 2

- 500 to + 500 Pa

(± 2 inches H2O)

- 125 to + 125 Pa

(± ½ inch H2O)

Zero point accuracy 3,4

0.1 Pa

0.08 Pa

Span accuracy 3,4

3% of reading

3% of reading

Zero point repeatability 4

0.03 Pa

0.025 Pa

Span repeatability 4

0.5% of reading

0.5% of reading

Span shift due to

temperature variation

< 0.5% of reading per 10°C

< 0.5% of reading per 10°C

Offset stability

< 0.01 Pa/year

< 0.01 Pa/year

Flow step response time (τ63)

< 3ms

Resolution

16 bit

Calibrated for

Air, N2

Media compatibility

Air, N2, O2, non-condensing

Calibrated temperature

range

-40 °C to +85 °C

1.2

Temperature Specification5

Parameter

Value

Measurement range

- 40 °C to +85 °C

Resolution

16 bit

Accuracy

2 °C (-10 °C to +60 °C)

3 °C (-40 °C to +85 °C)

Repeatability

0.1°C

1 Unless otherwise noted, all sensor specifications are valid at 25°C with VDD = 3.3 V and absolute pressure = 966 mbar.

2 For other pressure ranges contact Sensirion

3 Includes repeatability

4 Total accuracy/repeatability is a sum of zero-point and span accuracy/repeatability.

5 The measured temperature is the temperature of the bulk silicon in the sensor. This temperature value is not only depending on the gas temperature, but

also on the sensor’s surroundings. Using the signal to measure solely the gas temperature will need special precautions, such as isolating the sensor from

external temperate influences.