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Version 2.1 – November 2016

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Datasheet SDP1108-R

Low Differential Pressure Sensor

with fast response time

− For medical ventilators (ICU and home care)

− High sensitivity below 10 Pa to measure small volume flow (neonatal)

− Fast response time for efficient trigger function

− Offset and hysteresis free

− Fully calibrated and temperature compensated

− Not sensitive to the mounting orientation and vibrations

SDP1108-R Product Summary

The SDP1108-R sensor is a differential pressure sensor

for air based on the successful SDP1000 sensor from

Sensirion. The response time of the SDP1108-R has

been optimized for medical ventilation applications.

Mounted in a rugged, chemically inert PPS housing the

SDP1108-R differential pressure sensors feature a unique

dynamic range, zero offset and unsurpassed long term

stability. This makes it an ideal fit for demanding yet cost

sensitive OEM applications in medical and HVAC

equipment.

The SDP1108-R is supplied with 5.0 V and provides a

0.25…4.0 V output. Although the output of the sensor is

analog, the internal linearization and temperature

compensation is performed digitally. This results in a

superior accuracy, outstanding resolution (up to 0.05 Pa),

and lowest temperature dependence.

Its leading performance is based on Sensirion’s proprietary

element with amplification and A/D conversion on one

single silicon chip. The differential pressure is measured by

a thermal sensing element. In contrast to other thermal

differential pressure sensors only a very small amount of

air is required. This leads to a reliable operation even

under harsh conditions. In comparison to membrane and

piezo-resistive based sensors the SDP1108-R differential

pressure sensors show an extended measurement range,

better offset stability and improved reproducibility even at

lowest pressure ranges. In addition the SDP1108-R is

robust against pressure bursts and shows no sensitivity to

the mounting orientation.

Applications

Medical applications:

 Homecare ventilation

 Intensive care ventilation (ICU)

Block Diagram

SENSOR CHIP

Pin 1:

Pin 3: OUT

0.25 V to 4 V

Pin 2:

GND