SDP1000-L

Low Range Differential Pressure Sensor for Air and Non-Aggressive Gases 

## **Datasheet SDP1000** 

- For HVAC and medical OEM applications 

- Unsurpassed performance thanks to CMOSens[®] technology 

- Offset and hysteresis free 

- Excellent accuracy and reproducibility even below 10 Pa 

- Fully calibrated and temperature compensated 

- Linear or square root extracted output characteristics available 

- Not sensitive to the mounting orientation 

- Direct PCB mounting with simple snap-on system ~~BS~~ 

Datasheet – v5.1 

## **SDP1000 Product Summary** 

The SDP1000 differential pressure sensors for air cover the following measurement ranges:  –5 to 125 Pa (0.5 inch H2O), and -20 to 500 Pa (2 inch H2O). 

Mounted in a rugged, chemically inert PPS housing the SDP1000 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 HVAC and medical equipment. 

The devices are supplied with 5.0 V and provide a 0.25…4.0 V output. Although the output of the SDP1000 differential pressure sensor is analog, the internal linearization and temperature compensation is performed digitally. This results in a superior accuracy, outstanding resolution, and lowest temperature dependence. 

differential sensor transmitter with e.g. an 0...10 V output or other interfaces. 

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 sensor 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 based sensors the SDP1000 differential pressure sensors show an extended measurement range, better offset stability and improved reproducibility even at lowest pressure ranges. In addition, the SDP1000 is robust against pressure bursts and shows no sensitivity to the mounting orientation. 

Since fully exchangeable just a few external electronic components around the SDP1000 make a high quality 

## **Applications** 

## **Block Diagram** 

- Medical 

- HVAC 

- Automotive 

- Process Automation 

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CMOSens [®] VDD<br>5.0 V<br>SENSOR CHIP<br>GND<br>OUT<br>0.25 V<br>to 4 V<br>D/A<br>converter<br>Memory<br>Differential pressure Sensor<br>DIGITAL<br>A/D converter Temperature compensation<br>Linearization and<br>**----- End of picture text -----**<br>


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Datasheet SDP1000 Series 

## **1 Specifications** 

Table 1: Sensor specifications (at 23°C and pabsolute = 966mbar, VDD = 5.0 V unless otherwise noted). 

|Table 1: Sensor specifications (at 23°C and pabsolute = 966mbar, VDD = 5.0 V unless otherwise noted).absolute = 966mbar, VDD = 5.0 V unless otherwise noted).= 966mbar, VDD = 5.0 V unless otherwise noted).|Table 1: Sensor specifications (at 23°C and pabsolute = 966mbar, VDD = 5.0 V unless otherwise noted).absolute = 966mbar, VDD = 5.0 V unless otherwise noted).= 966mbar, VDD = 5.0 V unless otherwise noted).|
|---|---|
|**Parameter**<br>**SDP1000-L025**<br>**SDP1000-L05**<br>**SDP1000-L**<br>**Unit**<br>**Min**<br>**Typ**<br>**Max**<br>**Min**<br>**Typ**<br>**Max**<br>**Min**<br>**Typ**<br>**Max**<br>Measurement range<br>-62<br>62<br>-5<br>125<br>- 20<br>500<br>Pa<br>-0.25<br>0.25<br>-0.02<br>0.5<br>-0.08<br>2<br>Inch water<br>Power supply<br>(see Tab 4)<br>4.75<br>5.00<br>5.25<br>4.75<br>5.00<br>5.25<br>4.75<br>5.00<br>5.25<br>V<br>Full scale output<br>(100 kload)<br>Typ. 4.00V at +62Pa<br>Typ. 0.20V at –62Pa<br>4.00<br>4.00<br>V<br>~~——————~~<br>~~a~~<br>~~a~~<br>~~ee eeee~~<br>~~a~~<br>~~—~~<br>~~|~~<br>~~Tt |}~~<br>|<br>~~ft tt ft~~<br>~~a~~<br>~~ee ee~~||
|Zero Pressure Output<br>2.10<br>0.250<br>0.250<br>V<br>Accuracy<br>(also see Figure 1)<br>0.5<br>0.6<br>0.2<br>0.3<br>0.1<br>0.2<br>% FS(1)(2)<br>1.5<br>2<br>1.5<br>2<br>1<br>1.5<br>% m.v.(1)<br>~~aRe~~<br>~~a~~||
|Repeatability<br>0.3<br>0.5<br>0.3<br>0.5<br>0.3<br>0.5<br>~~a~~|% m.v.(1)|
|Offset stability<br>0<br>0.1<br>0<br>0.1<br>0<br>0.1<br>Pa / year<br>Additional error<br>over temperature<br>(T ≠ 23°C)<br>0.003<br>0.006<br>0.003<br>0.006<br>0<br>0<br>% FS/°C(2)<br>0.03<br>0.05<br>0.03<br>0.05<br>0.03<br>0.05<br>% m.v./°C<br>Resolution < 30% FS(1)<br>0.05<br>0.1<br>0.2<br>0.05<br>0.1<br>0.2<br>0.05<br>0.1<br>0.2<br>Pa<br>Resolution 30..70% FS(1)<br>0.2<br>0.5<br>1.5<br>Pa<br>Resolution > 70% FS(1)<br>1.5<br>2.2<br>3<br>Pa<br>(1)FS = full scale or span, m.v. = measured value, i.e. reading, whichever value is bigger<br>~~aee~~<br>~~i~~<br>~~——~~<br>~~a~~<br>~~——~~<br>~~a~~<br>~~—~~<br>~~a~~||



(1) FS = full scale or span, m.v. = measured value, i.e. reading, whichever value is bigger 

(2) FS = full scale or span, i.e. for the SDP1000-L it is 500 Pa (2 “H2O), for the SDP1000-L025 it is 62 Pa (0.25 “H2O) 

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10<br>9 (1) SDP1000 around 23°C<br>8 (2) SDP1000 between 0°…50°C<br>7 (3) Typical membrane based<br>sensor with 1.5% FS error<br>6<br>between 10°…40°C<br>5<br>4<br>3 (3)<br>2 (2)<br>1 (1)<br>0<br>0 10 20 30 40 50 60 70 80 90 100<br>differential pressure [% full scale]<br>± error [ % of measured value]<br>**----- End of picture text -----**<br>


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7<br>(1) SDP1000-L<br>6<br>(2,3) Membrane based sensors<br>5  2<br>4<br>3  3<br>2<br>1<br>0  1<br>0 1 2 3 4<br>repeatability [Pa]<br>offset drift/year [Pa]<br>**----- End of picture text -----**<br>


Figure 1:  Accuracy (includes errors caused by offset, linearity, hysteresis and repeatability) of the SDP1000-L (1), (2) compared with typical membrane sensors (3). 

Figure 2:  Max. repeatability and offset drift/year of the SDP1000-L (1) compared with two typical membrane based sensors (2,3). 

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Table 2: Additional sensor specifications. 

|Media|Air, N2– for othergases contact Sensirion AG.|
|---|---|
|Operating Conditions:<br>- Temperature<br>- Humidity|-10 °C … +60 °C / 14°F … 140 °F<br>non-condensing|
|Ambient storage conditions1|-40 °C … +80 °C / -40°F … 176 °F|
|Orientation sensitivity|below resolution|
|Response time|40 ms|
|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),<br>PEEK(Polyetheretherketone), FR4, Silicone as static sealing, Epoxy, Gold|
|Gas flow through sensor|see Figure 6.|
|REACH and RoHS|REACH and RoHS compliant|



> **(1)** For maximum 2 weeks 

## **1.1 Temperature Compensation** 

The SDP1000 differential pressure sensors feature 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. 

## **1.2 Altitude Correction** 

The SDP1000 differential pressure sensors achieve their unsurpassed performance by using a dynamic measurement principle, i.e. an applied differential pressure forces a small air flow through the sensor. This results in a dependence of the indicated differential pressure on the ambient air density. While the temperature effect is compensated (see Paragraph 1.1) the altitude above sea level has an influence on the SDP1000 output. If desired, this effect can be compensated by a correction factor according to the following equation: 

This leads to the following correction factors: 

Table 3: Altitude correction factors. 

|Altitude<br>[meter]|Ambient<br>Pressure<br>(Pamb) [mbar]|Correction Factor<br>Pcal/ Pamb|
|---|---|---|
|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|



## Example: 

The SDP1000 is used at 750 m above sea level. The output of the SDP1000 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: 

## Dpeff = Dpsensor * Pcal / Pamb 

where Dpeff is the effective differential pressure, Dpsensor the differential pressure indicated by the SDP1000, Pcal the absolute pressure during calibration (966 mbar) and Pamb the actual ambient absolute pressure. 

In many 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. 

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Datasheet SDP1000 Series 

## **2 Electrical Specifications** 

## **2.1 Power Supply** 

The SDP1000 differential pressure sensors require a stable voltage supply of 5 V. Influence of the supply voltage variation on the offset and the sensitivity are given in Table 5. 

## **2.2 Voltage Output** 

The SDP1000 features a voltage output from 0.25 V to 4.0 V (Figure 2). An output voltage below 0.25 V indicates a negative differential pressure. This range is not calibrated however. Exempt from this statement is the SDP1000-L025, which features a fully bidirectional calibration with 0.2 to 4.0 V output. 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). 

## **Linear output** 

Formula: P = lfactor * (voltage[(1)] – 0.250)/3.750 

|lfactor =|SDP1000-L05|SDP1000-L|
|---|---|---|
|Pascal|125|500|
|Inch water|0.5|2|



(1) voltage: measured output voltage in Volt. 

## **For bi-directional SDP1000-L025** 

Formula: P=lfactor * (voltage – 2.10)/1.90 lfactor = 62 Pa or 0.25 Inch water 

Table 4: SDP1000 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 4.3 5.2 mA Output capacitive load Cload 20 200 pF Recommended load Rload To GND 20 100  k Table 5: Typical power supply dependence of the offset and the sensitivity. **Parameter Device 4.75 V 5.0 V 5.25 V Units** SDP1000-L025 - 3.5 + 3.5 Offset SDP1000-L05 - 0.4 + 0.4 Pa SDP1000-L - 1.6 + 1.6 SDP1000-L025 29.0 30.6 32.2 Sensitivity SDP1000-L05 28 30 32 mV/Pa SDP1000-L 7.1 7.5 7.9 ~~==[==]~~ www.sensirion.com Version 5.1 April 2017 4/8 

Datasheet SDP1000 Series 

## **3 Physical Dimensions and Mounting Information** 

## **3.1 Housing** 

The SDP1000 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 4 and 5. 

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5.2<br>(0.205)<br>oe 16.0<br>(0630)<br>7 Tason<br>P e | [ |<br>A A o A<br>|1 — ttG= | ilTR Hi | Lo | _ _<br>30.5  SENSIRION r =<br>(1.200)<br>[ | THE SENSOR cial |<br>ria) (1 ( SDP100000206-10033-250-001 })<br>Vo a<br>254<br>(0.100) 1.8<br>[| Pint 1 2 3 (0 .071)<br>22.1<br>13.1  F I { I m i []| 18.3  (0.870)<br>(0.516)  —— (0.720)<br>=<br>**----- End of picture text -----**<br>


|**Dim.**|**[mm]**|**[inch]**|
|---|---|---|
|A|3.00|0.118|
|B|3.30|0.130|
|C|1.20|0.047|
|D|10.20|0.402|
|E|28.20|1.110|
|F|2.54|0.100|
|G|0.60|0.024|
|H|0.50|0.020|
|I|22.70|0.894|



|**Pin#**|**Function**|
|---|---|
|1<br>2<br>3|VDD (5 Vdc)<br>Ground<br>OUT(0.25…4 Vdc)|



Figure 4:  Pin out and physical dimensions in mm (inch). The drawing is not to scale. 

Figure 5: SDP1000 PCB footprint. The drawing is not to scale. 

## **3.2 Soldering Instructions** 

The SDP1000 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 SSM103-L-SV) and to mount the SDP1000 after soldering. 

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Datasheet SDP1000 Series 

## **3.3 Connecting Hose** 

Sensirion recommends a hose with an inner diameter of 1/8 to 3/20 inch (3.18 to 3.8mm). Due to the dynamic measurement principle, a small air flow is 

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120<br>100<br>80<br>60<br>40<br>20<br>0<br>0 20 40 60 80 100<br>differential pressure [% full scale]<br>gas flow [sccm]<br>**----- End of picture text -----**<br>


Figure 6: Typical air flow through the SDP1000. Please note: 1 sccm = 1 cm[3] /min at 0°C and 1013 mbar pressure (1 sccm = 0.001 norm liter). 

required (Figure 6) which leads to a dependence on the length of the hose (Figure 7). Tubes up to 1 m show less than 1 % error of the measured value (Figure 7). 

|**Length of the**<br>**connecting hose**|**Deviation of**<br>**Measured Value**|
|---|---|
|0.5 m (20 inch)|- 0.4 %|
|1.0 m (40 inch)|- 0.8 %|
|2.0 m (80 inch)|- 1.6 %|
|4.0 m (160 inch)|- 3.2 %|



- Figure 7: Influence of the length of the connecting hose on the accuracy (using 3/16 inch inner diameter). Example: a 50 Pa difference pressure is shown as 49.8 Pa when using 0.5 m tube with 3/16 inch diameter. 

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## **4 Ordering Information** 

When ordering SDP1000 differential pressure sensors 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 

Table 6: Overview ordering information 

|Table 6: Overview ordering information|Table 6: Overview ordering information||||||
|---|---|---|---|---|---|---|
|Part Name|Output|Range (Full Scale)||||Article Number|
|SDP1000-L025|Voltage 0.2 – 4.0 V, linear|± 62 Pa|± 0.62 mbar ± 0.25 "H|± 0.62 mbar ± 0.25 "H20 ± 0.009 PSI|0 ± 0.009 PSI|1-100313-03|
|SDP1000-L05|Voltage 0.25 - 4.0 V, linear|125 Pa|1.25 mbar|0.5 "H20|0.018 PSI|1-100235-03|
|SDP1000-L|Voltage 0.25 - 4.0 V, linear|500 Pa|5 mbar|2 "H20|0.07 PSI|1-100110-03|



## **5 Revision history** 

Table 7: Revision history 

|Table 7: Revision history<br>~~ee~~|Table 7: Revision history|||
|---|---|---|---|
|Date<br>~~ee~~|Version|Page(s)|Changes|
|November 2002<br>~~ee~~<br>~~a~~|Preliminaryv0.9<br>~~a~~<br>~~a~~|all<br>~~a~~<br>~~a~~|Firstpreliminaryrelease<br>~~a~~|
|January2003<br>~~a~~<br>~~a~~|First release<br>~~a~~<br>~~a~~<br>~~a~~<br>~~a~~|all<br>~~a~~<br>~~a~~<br>~~a~~<br>~~a~~|Specifications,typos,various small modifications<br>~~a~~|
|December 2004<br>~~a~~<br>~~a~~|V2.6<br>~~a~~<br>~~a~~<br>~~a~~<br>~~a~~|all<br>~~a~~<br>~~a~~<br>~~a~~<br>~~a~~|Introduction type L05<br>~~a~~<br>~~a~~|
|Juni 2005<br>~~a~~<br>~~a~~|V2.7<br>~~a~~<br>~~a~~<br>~~a~~|all<br>~~a~~<br>~~a~~<br>~~a~~|Change ofaddress, adjusted specificationsfortypeL05<br>~~a~~<br>~~a~~<br>~~a~~|
|March 2006<br>~~a~~|V2.8<br>~~a~~|all<br>~~a~~|IntroductionofSensirionUSAaddress, updated disclaimer<br>~~a~~|
|March 2006<br>~~a~~|V2.9<br>~~a~~|2,6<br>~~a~~|New Calibration temperature: 23°C. Change of barbs/ports diameter<br>specification<br>~~a~~|
|October 2006|V3.0|1,8,9|RoHS statement,Introductionof revision historyinthis document|
|May 2008<br>~~a~~|V3.1<br>~~a~~|All<br>~~a~~|RoHS statement on page 3, New disclaimer on page 10, Contact<br>addresses updated, Various small modifications, Inconsistency in Zero<br>Pressure /FullScale Output corrected<br>~~a~~|
|September 2008|V4.0|2-5,8|SDP2000-R discontinued, new SDP1000-L025 implemented, power<br>consumption, power supply dependence and temperature dependence<br>changed due to new SF04 sensor chip version, article number index<br>counted up due tonewsensorchipversion.Small linguistic adaptations.|
|October 2011<br>~~a~~|V4.1<br>~~a~~<br>~~a~~|1<br>~~a~~|Block diagram changed<br>~~a~~|
|February2013<br>~~a~~<br>~~a~~|V5<br>~~a~~<br>~~a~~<br>~~a~~<br>~~a~~|all<br>~~a~~<br>~~a~~|Updatedproduct number. Minor updates.<br>~~a~~<br>~~a~~|
|April 2017<br>~~a~~<br>~~a~~|V5.1<br>~~a~~<br>~~a~~<br>~~aee~~|all<br>~~a~~<br>~~ee~~|Removed SDP1000-R and moved SDP2000-L to separate datasheet<br>No changes to SDP1000 specifications<br>~~a~~<br>~~ee~~|



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Datasheet SDP1000 Series 

## **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) day 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. 

Copyright © 2001 -2017, SENSIRION. 

CMOSens[®] is a trademark of Sensirion 

All rights reserved 

## Headquarters and Subsidiaries 

SENSIRION AG Laubisruetistr. 50 CH-8712 Staefa ZH Switzerland 

Sensirion Inc., USA phone: +1 312 690 5858 info-us@sensirion.com www.sensirion.com 

Sensirion Korea Co. Ltd. phone: +82 31 337 7700~3 info-kr@sensirion.com www.sensirion.co.kr 

phone: +41 44 306 40 00 fax: +41 44 306 40 30 info@sensirion.com www.sensirion.com 

Sensirion Japan Co. Ltd. phone: +81 3 3444 4940 info-jp@sensirion.com www.sensirion.co.jp 

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 **6** 

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

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