slp004d low pressure sensors 1/4 july 2005 / 046 www.sensortechnics.com features 0...4 "h 2 o accurate low pressure readings low cost high impedance bridge low noise low power consumption for battery operation button package applications medical instrumentation portable and battery powered equipment air flow monitoring hvac industrial controls general description the slp series of pressure sensors provides low cost measuring for very low pressures. these devices were specifically designed to accurately measure differential and gage pressures of 0 to 4 "h 2 o. they are compatible for use with non-corrosive and non-ionic media, such as air and dry gases. the devices allow application of pressure to either side of the dia- phragm and can be used for gage or differential pressure measurements. equivalent circuit scale: 1 cm ? inch electrical connection output+ ground output- +v s +v s differential/gage "d4" dip package note: polarity applies for positive pressure applied to port p2 (backward gage) outpu t - vs +
slp004d low pressure sensors 2/4 july 2005 / 046 www.sensortechnics.com absolute maximum ratings min. --- +1700 +34 -2850 -40 --- --- --- --- --- +2100 --- --- --- typ. --- +2500 +50 -2400 0 4 0.5 0.5 0.5 4.65 +2300 4.70 0.2 50 max. 4 +5500 +110 -1950 +40 --- 1.0 --- --- --- +2500 --- --- --- unit "h 2 o v/v/"h 2 o mv ppm/c mv v/vc %fs %fs ms k ? ppm/c k ? %fs v/v/g characteristics operating pressure sensitivity t a = 25c full-scale span 4 "h 2 o 2 temperature coefficient of span 5,8 zero pressure offset t a = 25c temperature coefficient of offset 5 combined linearity and hysteresis 3 long term stability of offset and sensitivity 7 response time (10 % to 90 %) 6 input resistance t a = 25c temperature coefficient of resistance 5,8 output impedance repeatability 4 position sensitivity slp004d performance characteristics 1 warning: due to the delicate nature of these very sensitive devices, some special handling is required . parts are sensitive to shock and vibration and must be handled with care. dropping on any hard surface (bench top etc.) can destroy the device. note 10 "h 2 o overpressure. supply voltage, v s 7.5 v dc temperature range operating 0 to 50c storage 0 to 70c common-mode pressure 150 "h 2 o lead temperature (soldering 4 sec.) 250c proof pressure 10 "h 2 o burst pressure 1 5 psi or 150 "h 2 o specification notes: 1. 2. 3. 4. 5. 6. 7. 8. 9. reference conditions: supply voltage, v s = 5 v dc , t a = 25c, common-mode line pressure = 0 psig, pressure applied to p2. span is the algebraic difference between the output voltage at full scale pressure and the output at zero pressure. see definition of terms: hysteresis - the maximum output difference at any point within the operating pressure range for increasing and decreasing pressure. maximum difference in output at any pressure with the operating pressure range an temperature within 0c to +50c after: a) 1,000 temperature cycles, 0c to 50c b) 1.5 million pressure cycles, 0 psi to full-scale span slope of the best straight line from 0c to 50c. for operation outside this temperature, contact factory for more specific applications information. response time for a 0 psi to full-scale span pressure step change. 10 % to 90 % rise time. long term stability over a one year period. this parameter is is not 100 % tested. it is guaranteed by process design and tested on a sample basis only. if the maximum burst pressure is exceeded, even momentarily, the package may leak or burst, or the pressure sensing die may fracture.
slp004d low pressure sensors 3/4 july 2005 / 046 www.sensortechnics.com general information the slp family of pressure sensors function as a wheatstone bridge. when pressure applied to the device the resistors in the arms of the bridge change as shown in figure 1. the resulting differential output voltage, v 0 , is easily shown to by v 0 = v b x ? r. since the change in resistance is directly propor- tional to pressure, v 0 can be written as: v 0 = s x p x v b + v os typical performance characteristics where: v 0 is the output voltage in mv s is the sensitivity in mv/v psi p is the pressure in psi v b is the bridge voltage in volts v os is the offset error (the differential output voltage when the applied pressure is zero). for a complete application discussion see sensyms scc series datasheet. figure i application information
slp004d low pressure sensors 4/4 july 2005 / 046 www.sensortechnics.com ordering information button package slp004d pressure range 0 to 4 "h 2 o sensym and sensortechnics reserve the right to make changes to any products herein. sensym and sensortechnics do not assume any liability arising out of the application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor the rights of others. physical dimensions button package order part number dip package SLP004DD4 mass: 1 g dimensions in inches (mm) mass: 1 g dimensions in inches (mm) d4-housing 0.020 typ. (0.51) 0.110 typ. (2.79) 0.380 (9.65) 0.285 (7.24) 0.090 typ. (2.29) 0.470 (11.94) 0.050 typ. (1.27) 0.550 (13.97) p2 p1 0.600 (15.24) 0.01 (0.25) 0.100 typ. (2.54) 0.300 (7.62) 0.070 (1.78) 0.135 (3.43) 0.250 (6.35)
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