Datasheet Differential Pressure Sensor SDP1108
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SDP1108/SDP2108 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 SDPx108 Product Summary The SDPx108 sensor family is a differential pressure sensor for air based on the successful SDP1000/ SDP2000 sensor from Sensirion AG. The response time of the SDPx108 has been optimized for medical ventilation applications. Mounted in a rugged, chemically inert PPS housing the SDPx108 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 SDPx108 is fully RoHS compliant. The SDPx108 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 SDPx108 differential pressure sensors show an extended measurement range, better offset stability and improved reproducibility even at lowest pressure ranges. In addition the SDPx108 is robust against pressure bursts and shows no sensitivity to the mounting orientation. Applications Medical applications: Homecare ventilation Օ Intensive care ventilation (ICU) Other Block Diagram Pin 3: OUT 0.25 V to 4 V CMOSens® SENSOR CHIP o E CD Pin 2: GND ! ! .՗ CD s_ c !E5 o CD E7) <D & ■o 2> o Q1|É 2 CD > O O Pin 1: Vdd5.0 V www.sensirion.com Version 1.1 - June 2010 1/7

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SENSIRION the sensor company Table 2: Additional sensor spcifications. 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...

SENSIRION the sensor company measurement the described effect is actually welcome effective value to control. since at the end the mass flow and not volume flow is the 3 Physical Dimensions and Mounting Information 3.1 Housing The SDPx108 differential pressure transducers are 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. 5.2 (0.205) 16.0 (0.630) I l-A »l NA J3.4 "(0.134) 1 ~ 30.5...

SENSIRION the sensor company 3.2 Soldering Instructions The SDPx108 differential pressure sensors 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 SDPx108 after soldering. 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...

SENSIRION thg sensor company Table 6: SDPx108 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 oo kW 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 1-100339-02 SDP2108-R 1-100729-02 Revision history Date...

SENSIRION the sensor company 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 data sheet 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...