pressure die AMSYS

LMI – digital low pressure sensor with amplified output

The digital LMI differential pressure sensors with I²C bus and 3 V supply are based on thermal micro-flow measurement within the silicon sensor chip and offer measuring ranges from 25 Pa (0.1 inH2O) Full Scale.

Due to their excellent sensitivity, accuracy, offset long term stability and long service life, LMI sensors are ideal for differential pressure gas flow measurement in bypass configuration. For battery powered applications the sensor features a low-power mode with minimal standby current.

The extremely low gas flow through the sensor ensures high immunity to dust contamination and long tubing compared to other flow-based pressure sensors. The low profile sensors of the LMI series feature a total height of only 9 mm including pressure ports and allow for flexible direct manifold assemblies. Further, the SMT devices are highly versatile to fit to custom adaptors for application-specific mounting requirements.


differentiall / relative: 0-25 Pa, 0-50 Pa, 0-100 Pa, 0-250 Pa, 0-500 Pa, 0-1250 Pa, 0-2500 Pa, 0-5000 Pa

bidirectional differentiall: ±25 Pa, ±50 Pa, ±100 Pa, ±250 Pa, ±500 Pa, ±1250 Pa, ±2500 Pa, ±5000 Pa


  • Pressure ranges 0 .. 25 Pa to 0 .. 50 mbar differential / gauge, ±25 Pa to ±50 mbar bidirectional differential
  • Output signal I²C
  • Pressure connection O-ring (manifold), tube fitting with adapter
  • Size without nipples and pins 11,2 x 17,6 x 6 mm³
  • Operating temperature range -20 .. 80 °C
  • Supply voltage 3,3 V
  • Proof pressure 2 bar
  • Burst pressure 5 bar


Medical devices

  • Respiratory devices
  • Sleep diagnostic devices
  • Sleep apnea therapy devices (CPAP)
  • Spirometers
  • Anesthetic devices
  • Dialysis machines
  • Infusion pumps
  • Oxygen concentrators
  • Vacuum suction pumps
  • Insufflators
  • Videoscopes
  • Blood sugar measuring devices
  • Pulse oximeters
  • Computer tomographs (CT)
  • Gamma probes


  • Volumetric flow measurement
  • Channel pressure monitoring
  • Room pressure monitoring
  • Filter monitoring


For information on prices and delivery times or if you have any technical questions, please contact