LMI series digital low dierff ential pressure sensors The LMI dieff rential low pressure sensors are based on thermal flow measurement of gas through a micro-flow channel integrated within the sensor chip. The innovative LMI technology features superior sensitivity especially for ultra low pressures. The extremely low gas flow through the sensor ensures high immunity to dust contamination, humidity and long tubing compared to other flow-based pressure sensors. Features Certificates Applications Ultra-low pressure ranges from 25 to 5000 Pa Quality Management System according to Medical (0.1 to 20 inH O) EN ISO 13485 and EN ISO 9001 Ventilators 2 Pressure sensor based on thermal micro- RoHS and REACH compliant Spirometers flow measurement CPAP High flow impedance Sleep diagnostic equipment very low flow-through leakage Nebulizers high immunity to dust and humidity Media compatibility Oxygen conservers/concentrators no loss in sensitivity using long tubing Insulff ators/endoscopy Outstanding long-term stability and precision Air and other non-corrosive gases with patented real-time offset compensation Industrial and linearization techniques HVAC Total accuracy better than 0.5% FS typical VAV On-chip temperature sensor Filter monitoring Two user-driven modes of operation Burner control low power mode (400 A standby current) Fuel cells continuous mode (5 ms sampling time) Gas leak detection Ideal for battery-operated applications Fume hood Linearized digital IC output with 16 bit Instrumentation sigma-delta A/D conversion Security systems Small footprint, low profile, only 9 mm in height, and robust package Pressure ports for direct manifold assemblies Highly versatile to fit to application-specific mounting adaptors and manifolds Minimized internal volume and manifold mount option allow for fast gas purge time No position sensitivity E / 11823 / D Subject to change without notice www.first-sensor.com contact first-sensor.com Page 1/18LMI series digital low dierff ential pressure sensors Maximum ratings Parameter Supply voltage V 2.7 3.6 V S DC Output current 1 mA Soldering recommendations (1, 2) Reflow soldering Average preheating temperature gradient 1.5 K/s Time above 217 C 74 s Time above 240 C 30 Peak temperature 245 C Cooling temperature gradient -1.4 K/s Wave soldering, pot temperature 260 C Hand soldering, tip temperature 370 Temperature ranges Compensated 0 +70 Operating -20 +80 C Storage -40 +80 Humidity limits (non-condensing) 97 %RH (3) Vibration 20 g (4) Mechanical shock 500 Pressure sensor characteristics (5) (5) Part no. Operating pressure Proof pressure Burst pressure LMIS025U... 0...25 Pa / 0...0.25 mbar (0.1 inH2O) LMIS050U... 0...50 Pa / 0...0.5 mbar (0.2 inH2O) LMIS100U... 0...100 Pa / 0...1 mbar (0.4 inH2O) LMIS250U... 0...250 Pa / 0...2.5 mbar (1 inH2O) LMIS500U... 0...500 Pa / 0...5 mbar (1 inH2O) LMIM012U... 0...1250 Pa / 0...12.5 mbar (5 inH O) 2 LMIM025U... 0...2500 Pa / 0...25 mbar (10 inH O) 2 LMIM050U... 0...5000 Pa / 0...50 mbar (20 inH O) 2 2 bar 5 bar LMIS025B... 0...25 Pa / 0...0.25 mbar (0.1 inH O) (30 psi) (75 psi) 2 LMIS050B... 0...50 Pa / 0...0.5 mbar (0.2 inH O) 2 LMIS100B... 0...100 Pa / 0...1 mbar (0.4 inH O) 2 LMIS250B... 0...250 Pa / 0...2.5 mbar (1 inH O) 2 LMIS500B... 0...500 Pa / 0...5 mbar (2 inH O) 2 LMIM012B... 0...1250 Pa / 0...12.5 mbar (5 inH O) 2 LMIM025B... 0...2500 Pa / 0...25 mbar (10 inH O) 2 LMIM050B... 0...5000 Pa / 0...50 mbar (20 inH O) 2 (6) Gas correction factors Gas type Correction factor Dry air 1.0 Oxygen (O ) 1.07 2 Nitrogen (N ) 0.97 2 Argon (Ar) 0.98 Carbon dioxide (CO2) 0.56 Specification notes (1) Recommendations only. Actually reflow settings depend on many factors, for (4) 5 shocks, 3 axes, MIL-STD-883E, Method 2002.4. example, number of oven heating and cooling zones, type of solder paste/flux (5) The max. common mode pressure is 5 bar. used, board and component size, as well as component density. It is the (6) For example with a LMIS500... sensor measuring CO gas, at full-scale output 2 responsibility of the customer to fine tune their processes for optimal results. the actual pressure will be: (2) Handling instruction: Products are packaged in vacuum sealed moisture P = P x gas correction factor = 500 Pa x 0.56 = 280 Pa eff Sensor barrier bag with a floor life of 168hours (<30C, 60% R.H.). If floor life or P = True differential pressure eff environmental conditions have been exceeded prior to reflow assembly, baking P = Differential pressure as indicated by output signal Sensor is recommended. Recommended bake-out procedure is 72 hours 60C. (3) Sweep 20 to 2000 Hz, 8 min, 4 cycles per axis, MIL-STD-883, Method 2007. E / 11823 / D Subject to change without notice www.first-sensor.com contact first-sensor.com Page 2/18