SDP1108-R SENSIRION | Alldatasheet
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Technical content
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, chemi cally 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 res ults 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 conv ersion 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 har sh 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 press ure ranges. In additi on 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 MemoryD/A converter Pin 1: VDD 5.0 V Pin 3: OUT
0.25 V to 4 V
Pin 2: GND
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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. 50075.3 25.0_][Press. Diff. V VVoltageOutputPa 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 - 4 Volts 0 - 500 Pa 0 - 2 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 - 15 0.01 0.06 mV Pa 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 0.1 Pa / year Additional error over temperature7 (T ≠ 23°C) 0 to 100 % FS - 0.03 0.05 % Measured Value4 / °C zero - 1 2 mV/°C Response time(8) 6.6 8.0 10.1 ms Cut off frequency of internal filter 17 20 24 Hz 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]
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 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 com pensated using a correction factor according to the following equation: Dpeff = Dpsensor * Pcal / Pamb Where Dpeff is the effective differential pressure, Dp sensor the differential pressure indicated by the SDP1108-R, Pcal the absolute pressure du ring 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 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 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 P cal / P amb = 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.
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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] A 3.00 0.118 118 B 3.30 0.130 130 C 1.20 0.047 47 D 10.20 0.402 402 E 28.20 1.110 1110 F 2.54 0.100 100 G 0.60 0.024 24 H 0.50 0.020 20 I 22.70 0.894 894 Pin# Function
1 VDD (5 Vdc)
2 Ground
3 OUT (0.25…4 Vdc) 18.3 (0.720) 30.5 (1.200) 5.2 (0.205) 13.1 (0.516)
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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 smal l 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 4 92.5 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 6 mA Output capacitive load Cload 20 200 pF Recommended load Rload 20 100 k Hose length SDP1108-R @FS @0.5 FS
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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 V2 ANB Updated product number. Minor layout updates. November 2016 V2.1 ANB SDP2108-R discontinued and removed from datasheet.
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 suc h 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 t his 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 sh all 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 warrantie s, 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 specificall y 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 - 2016, SENSIRION. CMOSens® is a trademark of Sensirion All rights reserved 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