LBA Series Low differential pressure sensors FEATURES · Pressure ranges from 25 to 500 Pa (0.1 to 2 inH2O) · Pressure sensor based on thermal micro-flow measurement · Calibrated and temperature compensated · Linear 0.5...4.5 V output · High flow impedance → very low flow-through leakage → high immunity to dust and humidity → no loss in sensitivity using long tubing · RoHS and REACH compliant · Quality Management System according to ISO 13485:2003 and ISO 9001:2008 MEDIA COMPATIBILITY Air and other non-corrosive gases SPECIFICATIONS Maximum ratings 4.75 ... 5.25 VDC Supply voltage VS Output current 1 mA Lead specifications Average preheating temperature gradient 2.5 K/s Soak time ca. 3 min Time above 217°C 50 s Time above 230°C 40 s Time above 250°C 15 s Peak temperature 260°C Cooling temperature gradient -3.5 K/s Temperature ranges Compensated 0 ... +70 °C Operating -20 ... +80 °C Storage -40 ... +80 °C Humidity limits (non-condensing) 97 %RH 1 Vibration 20 g Mechanical shock2 500 g Specification notes: 1. Sweep 20 to 2000 Hz, 8 min, 4 cycles per axis, MIL-STD-883, Method 2007. 2. 5 shocks, 3 axes, MIL-STD-883E, Method 2002.4. E / 11691 / F ELECTRICAL CONNECTION 10 9 8 7 6 1 2 3 4 5 Pin 1 2 3 4 5 6, 7, 8, 9, 10 Connection GND +Vs GND (Main) Vout (bidirectional devices) Vout (unidirectional devices) GND Note: All GND pins 1, 3, 6, 7, 8, 9, 10 have to be connected. At no time should any voltage be applied to pins 1, 6, 7, 8, 9, 10. In case of manual handling ensure that the socket is unpowered during insertion/removal of the LBA sensor. 1/6 www.first-sensor.com www.sensortechnics.com LBA Series Low differential pressure sensors PRESSURE SENSOR CHARACTERISTICS Part no. Operating pressure LBAS025U... 0...25 Pa / 0...0.25 mbar (0.1 inH2O) LBAS050U... 0...50 Pa / 0...0.5 mbar (0.2 inH2O) LBAS100U... 0...100 Pa / 0...1 mbar (0.4 inH2O) LBAS250U... 0...250 Pa / 0...2.5 mbar (1 inH2O) LBAS500U... 0...500 Pa / 0...5 mbar (2 inH2O) LBAS025B... 0...±25 Pa / 0...±0.25 mbar (±0.1 inH2O) LBAS050B... 0...±50 Pa / 0...±0.5 mbar LBAS100B... 0...±100 Pa / 0...±1 mbar (±0.4 inH2O) LBAS250B... 0...±250 Pa / 0...±2.5 mbar (±1 inH2O) LBAS500B... 0...±500 Pa / 0...±5 mbar (±2 inH2O) Proof pressure5 Burst pressure5 2 bar (30 psi) 2 bar (30 psi) (±0.2 inH2O) GAS CORRECTION FACTORS7 Gas type Dry air Oxygen (O2) Nitrogen (N2) Argon (Ar) Carbon dioxide (CO2) Correction factor 1.0 1.07 0.97 0.98 0.56 Specification notes (cont.): 3. Total accuracy is the combined error from offset and span calibration, linearity, pressure hysteresis and temperature effects. 4. The sensor is calibrated with a common mode pressure of 1 bar absolute. Due to the mass flow based measuring principle, variations in absolute common mode pressure need to be compensated according to the following formula: ∆Peff = ∆Psensor × 1 bara Pabs ∆Peff = True differential pressure ∆Psensor = Differential pressure as indicated by output voltage Pabs = Current absolute common mode pressure 5. The max. common mode pressure is 2 bar. 6. Figure based on accelerated lifetime test corresponding to 1 year of life. 7. For example with a LBAS500... sensor measuring CO2 gas, at 4.5 V output the actual pressure will be 500 Pa x 0.56 = 280 Pa. ∆Peff = ∆Psensor × gas correction factor E / 11691 / F ∆Peff = True differential pressure ∆Psensor = Differential pressure as indicated by output voltage 2/6 www.first-sensor.com www.sensortechnics.com LBA Series Low differential pressure sensors PERFORMANCE CHARACTERISTICS4 all 25 Pa, 50 Pa and 100 Pa devices (VS=5.0 VDC, TA=20°C, PAbs=1 bara, calibrated in air, output signal is non ratiometric to VS) Characteristics Min. Non-linearity Total accuracy3 Typ. Max. ±(1.8 % of reading + 0.2 %FSS) ±(2.4 % of reading + 0.3 %FSS) ±(2.25 % of reading + 2.25 %FSS) ±(4.25 % of reading + 2.25 %FSS) ±5 5...55 °C 0...70 °C Offset warm-up shift Offset long term stability6 Current consumption (no load) Response time (t63) Power-on time ±2 ±0.3 4 1-2 5 Unit mV %/year mA ms 10 Unidirectional devices Characteristics Zero pressure offset Full scale span Full scale output Thermal effects Offset Span 5...55 0...70 5...55 0...70 Min. Typ. Max. Unit 0.46 3.92 0.50 4.00 4.50 0.54 4.08 V °C °C °C °C ±1.25 ±1.75 ±40 ±80 ±2 ±2.75 Min. Typ. Max. 2.47 3.92 2.50 4.00 4.50 0.50 2.53 4.08 mV %FSS Bidirectional devices Characteristics Zero pressure offset Full scale span Output Thermal effects E / 11691 / F at max. specified pressure at min. specified pressure Offset 5...55 °C 0...70 °C Span 5...55 °C 0...70 °C ±1.25 ±1.75 ±25 ±50 ±2 ±2.75 Unit V mV %FSS 3/6 www.first-sensor.com www.sensortechnics.com LBA Series Low differential pressure sensors PERFORMANCE CHARACTERISTICS4 all 250 Pa and 500 Pa devices (VS=5.0 VDC, TA=20°C, PAbs=1 bara, calibrated in air, output signal is non ratiometric to VS) Characteristics Min. Non-linearity Thermal effects Offset 5...55 0...70 5...55 0...70 5...55 Span 3 Total accuracy Typ. Max. ±(1.5 % of reading + 0.2 %FSS) ±(2 % of reading + 0.2 %FSS) ±25 ±40 ±1.75 ±2.5 ±(1.5 % of reading + 1.5 %FSS) ±(3.5 % of reading + 1.5 %FSS) ±5 °C °C °C °C °C ±1 ±1.5 0...70 °C Offset warm-up shift Offset long term stability6 Current consumption (no load) Response time (t63) Power-on time ±1 ±0.3 4 1-2 5 10 Unit mV %FSS mV %/year mA ms Unidirectional devices Characteristics Zero pressure offset Full scale span Full scale output Min. Typ. Max. Unit 0.47 3.94 0.50 4.00 4.50 0.53 4.06 V Min. Typ. Max. Unit 2.47 3.94 2.50 4.00 4.50 0.50 2.53 4.06 Bidirectional devices Characteristics Zero pressure offset Full scale span Output E / 11691 / F at max. specified pressure at min. specified pressure V 4/6 www.first-sensor.com www.sensortechnics.com LBA Series Low differential pressure sensors OUTLINE DRAWING LBA...E... (SMD, 2 ports same side) 17.70 12.70 ±0.15 5.60 ±0.2 0.25 High pressure port 10 9 8 7 6 3.0 13.85 15.22 18.03 Ø 2.20 17.53 10.70 ±0.15 5.0 6.26 1 2 3 4 5 1.43 5.08 2.54 3.10 ±0.2 0.51 1.27 1.60 ±0.2 5.60 dimensions in mm 2.50 LBA...F... (DIP, 2 ports same side) 17.70 12.70 ±0.15 5.60 ±0.2 High pressure port 10 9 8 7 6 3.0 0.25 14.97 18.03 Ø 2.20 17.53 10.70 ±0.15 5.0 6.26 1 2 3 4 5 7.85 8.95 ±0.5 15.65 16.05 10.16 2.54 0.46 3.10 ±0.2 1.60 ±0.2 5.60 2.50 E / 11691 / F dimensions in mm 5/6 www.first-sensor.com www.sensortechnics.com LBA Series Low differential pressure sensors ORDERING INFORMATION Series Pressure range Options LB A S 025 S 050 Calibration 25 Pa B Bidirectional (0.1 inH2O) U Unidirectional 50 P a (0.2 inH2O) S 100 Housing Output E SMT, 2 ports 6* 0.5...4.5 same side non-ratiometric Grade S High F DIP, 2 ports same side 100 P a (0.4 inH2O) S 250 250 P a (1 inH2O) S 500 500 P a (2 inH2O) * Ratiometric output versions on request Example: LB A S 250 B F 6 S First Sensor reserves the right to make changes to any products herein. First Sensor does 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. E / 11691 / F 6/6 www.first-sensor.com www.sensortechnics.com