SDP1108-R Datasheet by Sensirion AG

SENSIRION THE SENSOR COMPANY

www.sensirion.com Version 2.1 – November 2016 1/7

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

− Unsurpassed performance thanks to CMOSens® technology

− 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

CMOSens® sensor technology which combines the sensor

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

Differential

pressure

Sensor

CMOSens®

SENSOR CHIP

DIGITAL

Linearization and

Temperature

compensation

A/D converter

Memory

D/A

converter

Pin 1:

VDD 5.0 V

Pin 3: OUT

0.25 V to 4 V

Pin 2:

GND

SENSIRION THE SENSE”: COMPANY mmmmmmmm

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1 Sensor Output Characteristics1

The SDP1108-R provides a fully calibrated voltage

output. To enhance the sensitivity at very low

differential pressures, the SDP1108-R comes with a

root-square output characteristic.

500

75.3

25.0_

][Press. Diff.















V

VVoltageOutput

Use this formula to convert the sensor output into

physical value.

1Calibration conditions apply unless otherwise noted: 23°C and pabsolute = 966 mbar, dry air, VDD = 5.000 V.

2 Specifications

Table 1: SDP1108-R Sensor specifications1

Parameter

SDP1108-R

Unit

Min

Typ

Max

Measurement range

0.25

Volts

500

Inch water

Accuracy3

20% FS to 100% FS

1.0

2.0

% Measured Value4

0 to 20% FS

0.2

0.4

% Full Span5

zero2

0.01

0.06

Repeatability

100 to 500 Pa

0.3

1.0

% Measured Value

0 to 100 Pa

0.05

0.2

% Full Span5

Null drift per year6

0.1

Pa / year

Additional error over

temperature7 (T ≠ 23°C)

0 to 100 % FS

0.03

0.05

% Measured Value4 / °C

zero

mV/°C

Response time(8)

6.6

8.0

10.1

Cut off frequency of internal filter

1 Calibration conditions apply unless otherwise noted: 23°C and pabsolute = 966 mbar, dry air, VDD = 5.000 V

2 Variance between the zero point (offset) of different sensors measured under the same conditions (e.g. same supply voltage, temperature, …)

3 Include deviations due to linearity, hysteresis, and repeatability

4 % Measured value = (SDP1108-R output [Pa] - output of reference instrument [Pa]) / output of reference instrument [Pa].

5 Full span is defined as 3750 mV / 500 Pa for SDP1108-R

6 Drift over time due to aging, pressure cycles… Test results can be provided.

7 The additional error due to temperature variation is temporary. Once the sensor is back to the calibration temperature, the shift disappears

(no hysteresis).

8 Tau= 0 to 63%, filter response time = 8ms.

SDP1108-R

0.25

0.75

1.25

1.75

2.25

2.75

3.25

3.75

100

differential pressure [% FS]

output voltage [V]

SENSIRION THE sensor: COMPANY Altitude Ambient Pressure Correction Factor 0 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

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.

1 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.

SENSIRION THE sense-a COMPANY 15.0 ‘A A may NoCompoeis inside this Ana 3 93 g _ G C c 305 E Ii V ' " ' W B ipak 1.5 7 D Pm123 (omit HHH ‘ ‘ E ‘ 22.1 7 g was i i@ . , Dim. [mm] [inch] [mil] 30.0 (1.131) Function VDD 5 Vdc Figure 1: Pin out and physical dimensions in mm (inch) The Figure 2: SDF’i iOB-R PCB footprint. The drawmg is

www.sensirion.com Version 2.1 – November 2016 4/7

3 Physical Dimensions and Mounting Information

3.1 Housing

The SDP1108-R differential pressure sensor is mounted

in chemically inert PPS housing. The rugged package

has been designed to withstand continuous

overpressures of at least 1 bar (14.5 PSI). Burst pressure

is > 2 bar (29 PSI)

The physical dimensions and mounting information is

given in Figure 1 and 2.

Figure 1: Pin out and physical dimensions in mm (inch). The

drawing is not to scale.

Figure 2: SDP1108-R PCB footprint. The drawing is

not to scale.

3.2 Soldering Instructions

The SDP1108-R differential pressure sensor can be

wave soldered. Direct reflow soldering is not

recommended since it may affect the accuracy.

If reflow soldering is required Sensirion recommends to

use an SMD connector (e.g. type Samtec SSM-103-L-

SV) and to mount the SDP1108-R after soldering.

22.1

(0.870)

Dim.

[mm]

[inch]

[mil]

3.00

0.118

118

3.30

0.130

130

1.20

0.047

10.20

0.402

402

28.20

1.110

1110

2.54

0.100

100

0.60

0.024

0.50

0.020

22.70

0.894

894

Pin#

Function

VDD (5 Vdc)

Ground

OUT (0.25…4 Vdc)

18.3

(0.720)

30.5

(1.200)

5.2

(0.205)

13.1

(0.516)

Dmerermal pressure across sum ma [Pa] 350 300 250 200 150 100 50 3D 60 Mass ﬂow mmugh SDP1105[sccm] 90 SENSIRION THE SENSOR COMPANY

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3.3 Connecting Hose

Sensirion recommends a hose with an inner diameter

of 3.18 to 3.8mm (1/8 to 3/20 inch). Due to the dynamic

measurement principle, a small air flow is required

(Figure 3) which leads to a dependence on the length

of the hose (Table 4). Tubes up to 1 m show less than

2 % error of the measured value (Table 4).

Figure 3: Typical air flow through the SDP1108-R. Please note:

1 scc/min = 1 cm3/min at 0°C and 1013 mbar pressure

(1 sccm = 0.001 norm liter).

Table 4: Influence of the length of the connecting hose on

the accuracy (using 4 mm inner diameter). Deviation is

given in % of the measured value. Example SDP1108-R: a

500 Pa difference pressure is shown as 492.5 Pa when

using 1 m tube with 4 mm inner diameter.

Table 5: Maximum flow through the sensor element.

SDP1108-R

Mass flow through sensor element:

123 sccm (@ 500 Pa)

4 Electrical Specifications

4.1 Power Supply

The SDP1108-R differential pressure sensor requires a

stable voltage supply of 5.0 V. The requirements for the

electrical supply are specified in Table 6.

4.2 Voltage Output

The SDP1108-R features a voltage output from 0.25 V

to 4.0 V. An output voltage below 0.25 V indicates a

negative differential pressure (not calibrated).

The resistive load at the output pin should be larger

than 20 kOhm. The capacitive load at the output pin

must not be larger than 200 pF. If the design shows a

larger capacity at the output pin an additional resistor is

required in series at the output (e.g. 620 Ohm).

Table 6: SDP1108-R electrical characteristics.

Parameter

Conditions

Min.

Typ.

Max.

Units

Power Supply Voltage VDD

4.75

5.0

5.25

VDC

Operating Current

5 V, no load, zero flow

5.1

Output capacitive load Cload

200

Recommended load Rload

100



k

Hose length

SDP1108-R

@FS

@0.5 FS

0.5 m (20 inch)

-0.75%

-0.95%

1.0 m (40 inch)

-1.5%

-1.9%

2.0 m (80 inch)

-3.0%

-3.8%

SENSIRION THE sensor: COMPANY n names and anicle numb hllg://www.sensir10n.com DaIe Revision Author Changes October 2008 V1 0 PHA Inmal release June2010 V11 DAT SDP2108 launched, New Item Number (see product change nonﬁcalion PCN February 2013 V2 ANE Updated product number Minor layout updates. Ndvember2016 V21 ANE SDP2108—R discommued and removed from datasheel

www.sensirion.com Version 2.1 – November 2016 6/7

5 Ordering Information

When ordering please refer to the following part names and article numbers. For the latest product information and

local distributor check out Sensirion’s website on http://www.sensirion.com

Part Name

Article Number

SDP1108-R

1-100339-03

Revision history

Date

Revision

Author

Changes

October 2008

V1.0

PHA

Initial release

June 2010

V1.1

DAT

SDP2108 launched, New Item Number (see product change notification PCN

081015), block diagram (page 1), minor changes

February 2013

ANB

Updated product number. Minor layout updates.

November 2016

V2.1

ANB

SDP2108-R discontinued and removed from datasheet.

SENSIRION THE sensor: COMPANY SENSIRION AG phon +41 44 306 4 fax: +41 44 306 info@sensinon.com www.3ensirion.com Sensirion Taiwan Co. Ltd. phone: +41 44 306 info@sensinon.com Sensirion Inc., USA phone: +1 805 409 490 1nfo-us@sensirion.com www.5ensirion.com Sensirion Japan Co. Ltd phone: +81 3 3444 494 1nfo-‘g@sensirion.com www.5ensirion.co.'g Sensinon Korea Co. Ltd. phone: +82 31 337 77 info-kr@sensirion.oom wwsensirionmkr Sensinon China Co. Ltd. phone: +86 755 82521 info-cn@sensirion.com wwsensinonmmm

www.sensirion.com Version 2.1 – November 2016 7/7

Important Notices

Warning, personal injury

Do not use this product as safety or emergency stop devices

or in any other application where failure of the product could

result in personal injury (including death). Do not use this

product for applications other than its intended and

authorized use. Before installing, handling, using or servicing

this product, please consult the datasheet and application

notes. Failure to comply with these instructions could result in

death or serious injury.

If the Buyer shall purchase or use SENSIRION products for any

unintended or unauthorized application, Buyer shall defend,

indemnify and hold harmless SENSIRION and its officers,

employees, subsidiaries, affiliates and distributors against all

claims, costs, damages and expenses, and reasonable attorney

fees arising out of, directly or indirectly, any claim of personal injury

or death associated with such unintended or unauthorized use,

even if SENSIRION shall be allegedly negligent with respect to the

design or the manufacture of the product.

ESD Precautions

The inherent design of this component causes it to be sensitive to

electrostatic discharge (ESD). To prevent ESD-induced damage

and/or degradation, take customary and statutory ESD precautions

when handling this product.

See application note “Handling Instructions” for more information.

Warranty

SENSIRION warrants solely to the original purchaser of this

product for a period of 12 months (one year) from the date of

delivery that this product shall be of the quality, material and

workmanship defined in SENSIRION’s published specifications of

the product. Within such period, if proven to be defective,

SENSIRION shall repair and/or replace this product, in

SENSIRION’s discretion, free of charge to the Buyer, provided that:

 notice in writing describing the defects shall be given to

SENSIRION within fourteen (14) days after their appearance;

 such defects shall be found, to SENSIRION’s reasonable

satisfaction, to have arisen from SENSIRION’s faulty design,

material, or workmanship;

 the defective product shall be returned to SENSIRION’s

factory at the Buyer’s expense; and

 the warranty period for any repaired or replaced product shall

be limited to the unexpired portion of the original period.

This warranty does not apply to any equipment which has not been

installed and used within the specifications recommended by

SENSIRION for the intended and proper use of the equipment.

EXCEPT FOR THE WARRANTIES EXPRESSLY SET FORTH

HEREIN, SENSIRION MAKES NO WARRANTIES, EITHER

EXPRESS OR IMPLIED, WITH RESPECT TO THE PRODUCT.

ANY AND ALL WARRANTIES, INCLUDING WITHOUT

LIMITATION, WARRANTIES OF MERCHANTABILITY OR

FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY

EXCLUDED AND DECLINED.

SENSIRION is only liable for defects of this product arising under

the conditions of operation provided for in the datasheet and proper

use of the goods. SENSIRION explicitly disclaims all warranties,

express or implied, for any period during which the goods are

operated or stored not in accordance with the technical

specifications.

SENSIRION does not assume any liability arising out of any

application or use of any product or circuit and specifically

disclaims any and all liability, including without limitation

consequential or incidental damages. All operating parameters,

including without limitation recommended parameters, must be

validated for each customer’s applications by customer’s technical

experts. Recommended parameters can and do vary in different

applications.

SENSIRION reserves the right, without further notice, (i) to change

the product specifications and/or the information in this document

and (ii) to improve reliability, functions and design of this product.

CMOSens® is a trademark of Sensirion

Headquarters and Subsidiaries

SENSIRION AG

Laubisruetistr. 50

CH-8712 Staefa ZH

Switzerland

phone: +41 44 306 40 00

fax: +41 44 306 40 30

info@sensirion.com

www.sensirion.com

Sensirion Inc., USA

phone: +1 805 409 4900

info-us@sensirion.com

www.sensirion.com

Sensirion Japan Co. Ltd.

phone: +81 3 3444 4940

info-jp@sensirion.com

www.sensirion.co.jp

Sensirion Korea Co. Ltd.

phone: +82 31 337 7700~3

info-kr@sensirion.com

www.sensirion.co.kr

Sensirion China Co. Ltd.

phone: +86 755 8252 1501

info-cn@sensirion.com

www.sensirion.com.cn

Sensirion Taiwan Co. Ltd.

phone: +41 44 306 40 00

info@sensirion.com

To find your local representative, please visit www.sensirion.com/contact

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