SDP1108-R datasheet(3/7 Pages) SENSIRION

3 / 7 page

www.sensirion.com

Version 2.1 – November 2016

3/7

Table 2: Additional sensor specifications.

Parameter

Media Calibration1

Air, N2 – for other gases contact Sensirion AG.

Media Compatibility

Air, N2, O2

Operating Conditions2:

- Temperature

- Humidity

-10 °C … +60 °C / 14°F … 140 °F

non-condensing

Ambient storage conditions3

-40 °C … +80 °C / -40°F … 176 °F

Orientation sensitivity

below zero point accuracy

Admissible overpressure (short term)

1 bar (14.5 PSI)

Burst Pressure Capability

2 bar (29 PSI)

Weight

14 g

Protection Class

IP 20

Wetted materials

Glass (silicon nitride, silicon oxide), Silicon, PPS (Polyphenylene Sulfide),

PEEK (Polyetheretherketone), FR4, Silicone as static sealing, Epoxy, Gold

Electromagnetic compatibility

EN 61000-4-2

Air discharge (ESD)

 2 kV

Lead free

Reach and RoHS compliant.

Sensors are calibrated for a specific gas, please contact Sensirion when you employ different gases than the specified.

2Condensation of liquids or dust on the sensor membrane might lead to sensor offset.

3For maximum 2 weeks

2.1 Temperature Compensation

The SDP1108-R differential pressure sensor features a

sophisticated built-in temperature compensation circuit.

The temperature is measured on the CMOSens® chip by

means of a PTAT bandgap reference temperature

sensor. Its data is fed into a compensation circuit which

is also integrated on the CMOSens® sensor chip. No

external temperature compensation is therefore required.

2.2 Altitude Correction

The SDP1108-R differential pressure sensor achieves its

unsurpassed performance by using a dynamic

measurement principle: An applied differential pressure

forces a small air flow through the SDP1108-R, which

measures this air flow.

The sensor signal is dependent on the ambient air

density. The temperature effect on density is

compensated by internal intelligence (see Paragraph

2.1). Effects on density due to a change of ambient

pressure, typically a change of altitude above sea level,

can be compensated using a correction factor according

to the following equation:

Dpeff = Dpsensor * Pcal / Pamb

Where Dpeff is the effective differential pressure, Dpsensor

the differential pressure indicated by the SDP1108-R, Pcal

the absolute pressure during calibration (966 mbar) and

Pamb the actual ambient absolute pressure.

This leads to the following correction factors:

Table 3: Altitude correction factors.

Altitude

[meter]

Ambient

Pressure

(Pamb) [mbar]

Correction Factor

Pcal / Pamb

1013

0.95

250

984

0.98

425

966

1.00

500

958

1.01

750

925

1.04

1500

842

1.15

2250

766

1.26

3000

697

1.38

Example:

The SDP1108-R is used at 750 m above sea level.

The output of the SDP1108-R shows 0.5 V, which

corresponds to Dpsensor = 33.3 Pa. Taking into account

the correction factor Pcal / Pamb = 1.04 the effective

differential pressure Dpeff is 33.3 Pa * 1.04 = 34.6 Pa.

Note:

In many medical and HVAC applications such as filter

monitoring, fan/ventilator control or air flow

measurement the described effect is actually

welcome since at the end the mass flow and not

volume flow is the effective value to control.

SDP1108-R 数据表(PDF) 3 Page - Sensirion AG Switzerland

SDP1108-R 数据表(HTML) 3 Page - Sensirion AG Switzerland

Html Pages

1 2 3 4 5 6 7

数据表下载