SENSIRION

Sensirion SDP sensors measure pressure but even a flow

Calibrated differential pressure sensors will find usage in industry and also in every smart home.

This is an archive article published 15.11.2013. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.
Ventilation, air conditioning (HVAC), or any other applications, where a pressure or a flow of air (gas) is essential, can be precisely regulated only if we know a real pressure/ flow conditions. Monitoring of fans functionality, status of filters, …, even for this purpose are very suitable differential pressure sensors from Swiss company Sensirion with an excellent accuracy and long-term stability.
As SDP sensors are differential, they have 2 nozzles. The base of these sensors is a miniature heating element and two temperature sensors. Difference of pressures will cause a small air flow through a component and it will cause a temperature difference in these built-in sensors. Temperature difference is directly depending on the amount (weight) of air flowing through a sensor and it naturally depends just on a pressure difference. A great advantage against membrane pressure sensors is a long-term high accuracy even at measuring of small pressure and maintaining of accuracy of a “zero point”.
















As an air specific weight depends on temperature, measurement based only on a temperature difference of two internal sensors wouldn´t be accurate. That´s why SDP sensors have a built-in temperature compensation and linearization, thus an output of a sensor is directly a value usable for further processing. Resolution of sensors is very high and is user selectable in a range of 9-16 bits. Resulting binary value read-out through I2C interface can be divided by a constant shown in a tab. 2.1 on page 3 of the SDP6xxv1.7 datasheet and we´ll get a resulting value in desired units (Pa, bar, inch).

Universal and price-attractive series is the SDP600 (6xx) series, in which we´ll find types optimized for measurement of pressure (SDP 600/610), mass flow (SDP601/611) and types with a minimal power consumption suitable even for battery-operated devices (SDP606/616). All these types are able to measure “bidirectionally” i.e. positive and even negative values. For applications, where we know, that a pressure difference will be always positive (flow by only one direction), it´s possible to use more price-affordable types SDP 500/510 (in fact even these types measure bidirectionally, but their accuracy is not guaranteed in this range). For the most of applications no additional compensation is necessary, only it can be necessary to multiply a resulting value by a constant for an altitude compensation shown in a table 5.4 on page 6 in the datasheet.
How can be this small sensor used to measure flow of a big amount of air?

Relatively simply. All that is necessary is to make a small orifice in a pipe and this way to create a “resistance” as described in the SDPxxx_Bypass_Configuration application note. In an electronics analogy the differential pressure measurement is similar to measurement of voltage on a resistor, which depends on a current flowing through a resistor. SDP sensors can be used even for measurement of a pressure difference in a given pipe against a surrounding environment, in such a way, that one nozzle of sensor will be left “unconnected”. Naturally, such a configuration can only be used if a small leakage of a measured “gas” (air) is acceptable.

Detailed information will provide you the SDP600 datasheet as well as documents SDP600_Sensor_Selection_Guide_V2, CMOSens_for_HVAC, SDP6x0_Changing_Measurement_Resolution and SDP6x0_Pressure_Drop_In_Hose.
For further information about Sensirion products please contact us at info@soselectronic.com.


















Advantages/ Features:

  • measuring of a differential pressure
  • flow measurement at a „bypass“ configuration
  • calibrated and temperature-compensated
  • outstanding repeatability, even under 10 Pa
  • accuracy better than 0.2% even near zero
  • digital output with I2C interface
  • outstanding reliability and a long-term stability
  • 9-16 bit resolution (12 bit default)
  • available in several versions
  • bidirectional measurement
  • can be mounted in any position

Gain the EK-P3 evaluation kit for free!

Competition with the following question has been published here:

What´s the difference of SDP606/616 sensors from other members of the SDP6xx series?

The correct answer was: Low Power
We have drawn the following winners:
István Müller [HU]
Congratulations to winners. We´ll inform them by e-mail.

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Additional products

image type / kind / description Ord.number manufacturer in stock External stock price/pc excl. VAT
EK-P3 SENSIRION EK-P3

Evaluation Kit for SDP5xx/6xx/7xx Sensors

More info: EK-P3.pdf

Pressure sensors

106358
S

SENSIRION

in stock 1 pcs
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1 pcs+ 93,30 €

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SDP600-500Pa (SDP600) SENSIRION SDP600-500Pa (SDP600)

Diff Pressure Sensor -500...500Pa Port D4x4mm I2C

More info: SDP600Series_v.1.9.p...

Pressure sensors

102050
O

SENSIRION

On request
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SDP610-25Pa SENSIRION SDP610-25Pa

Diff Pressure Sensor -25...25Pa Port D3.5x9.7 I2C

More info: SDP600Series_v.1.9.p...

Pressure sensors

119827
O

SENSIRION

On request
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SDP610-500Pa (SDP610) SENSIRION SDP610-500Pa (SDP610)

Diff Pressure Sensor -500...500Pa Port D3.5x9.7 I2C

Pressure sensors

102051
O

SENSIRION

On request
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SDP510 SENSIRION SDP510

Diff Pressure Sensor 0...500Pa Port D3.5x9.7 I2C

More info: SDP600Series_v.1.9.p...

Pressure sensors

113590
O

SENSIRION

On request
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SDP611 SENSIRION SDP611

Mass Flow Sensor -500...500Pa Port D3.5x9.7 I2C

More info: SDP600Series_v.1.9.p...

Pressure sensors

106357
O

SENSIRION

On request
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SDP1000-L025 SENSIRION SDP1000-L025

Diff Pressure Sensor -62…62Pa Port D3.4x13.5mm Analog Linear Out

More info: SDP1000_Datasheet_V5...

Pressure sensors

102045
O

SENSIRION

On request
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SDP1000-L SENSIRION SDP1000-L

Diff Pressure Sensor -20...500Pa Port D3.4x13.5mm Analog Linear Out

More info: SDP1000_Datasheet_V5...

Pressure sensors

102044
O

SENSIRION

On request
-
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SDP1000-L05 SENSIRION SDP1000-L05

Diff Pressure Sensor -5…125Pa Port D3.4x13.5mm Analog Linear Out

More info: SDP1000_Datasheet_V5...

Pressure sensors

102046
O

SENSIRION

On request
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SDP1000-R SENSIRION SDP1000-R

Diff Pressure Sensor -20…500Pa Port D3.4x13.5mm Analog SqRt Out

More info: SDP1000-2000.pdf

Pressure sensors

Alternative components: SDP1108-R SDP1000-L

102047
N

SENSIRION

Item is not held in stock any longer
SDP1108-R SENSIRION SDP1108-R

Diff Pressure Sensor 0…500Pa Port D3.4x13.5mm Analog SqRt Out

More info: SDP1108-R_Datasheet_...

Pressure sensors

102048
O

SENSIRION

On request
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SDP2000-L SENSIRION SDP2000-L

Diff Pressure Sensor -100…3500Pa Port D3.4x13.5mm Analog Linear Out

More info: SDP2000_Datasheet_V1...

Pressure sensors

102049
O

SENSIRION

On request
-
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EK-P3 SENSIRION  
EK-P3

Evaluation Kit for SDP5xx/6xx/7xx Sensors

Pressure sensors

Ord. No.: 106358
Manufacturer: SENSIRION
in stock 1 pcs
1 pcs+
93,30 €
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SDP600-500Pa (SDP600) SENSIRION  
SDP600-500Pa (SDP600)

Diff Pressure Sensor -500...500Pa Port D4x4mm I2C

Pressure sensors

Ord. No.: 102050
Manufacturer: SENSIRION
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SDP610-25Pa SENSIRION  
SDP610-25Pa

Diff Pressure Sensor -25...25Pa Port D3.5x9.7 I2C

Pressure sensors

Ord. No.: 119827
Manufacturer: SENSIRION
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SDP610-500Pa (SDP610) SENSIRION  
SDP610-500Pa (SDP610)

Diff Pressure Sensor -500...500Pa Port D3.5x9.7 I2C

Pressure sensors

Ord. No.: 102051
Manufacturer: SENSIRION
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SDP510 SENSIRION  
SDP510

Diff Pressure Sensor 0...500Pa Port D3.5x9.7 I2C

Pressure sensors

Ord. No.: 113590
Manufacturer: SENSIRION
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SDP611 SENSIRION  
SDP611

Mass Flow Sensor -500...500Pa Port D3.5x9.7 I2C

Pressure sensors

Ord. No.: 106357
Manufacturer: SENSIRION
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SDP1000-L025 SENSIRION  
SDP1000-L025

Diff Pressure Sensor -62…62Pa Port D3.4x13.5mm Analog Linear Out

Pressure sensors

Ord. No.: 102045
Manufacturer: SENSIRION
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SDP1000-L SENSIRION  
SDP1000-L

Diff Pressure Sensor -20...500Pa Port D3.4x13.5mm Analog Linear Out

Pressure sensors

Ord. No.: 102044
Manufacturer: SENSIRION
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SDP1000-L05 SENSIRION  
SDP1000-L05

Diff Pressure Sensor -5…125Pa Port D3.4x13.5mm Analog Linear Out

Pressure sensors

Ord. No.: 102046
Manufacturer: SENSIRION
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SDP1000-R SENSIRION  
SDP1000-R

Diff Pressure Sensor -20…500Pa Port D3.4x13.5mm Analog SqRt Out

Pressure sensors

Ord. No.: 102047
Manufacturer: SENSIRION
Item is not held in stock any longer

SDP1108-R SENSIRION  
SDP1108-R

Diff Pressure Sensor 0…500Pa Port D3.4x13.5mm Analog SqRt Out

Pressure sensors

Ord. No.: 102048
Manufacturer: SENSIRION
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SDP2000-L SENSIRION  
SDP2000-L

Diff Pressure Sensor -100…3500Pa Port D3.4x13.5mm Analog Linear Out

Pressure sensors

Ord. No.: 102049
Manufacturer: SENSIRION
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