Digital Flow Meter for Medical Gases

Sensirion launched a new digital flow meter for air and other non-aggressive gases – the SFM4100. The sensor unit has an I2C interface, provides a fully calibrated and temperature-compensated output signal, and operates reliably at pressures of up to 7 bar. Its long-term stability and freedom from drift make the instrument suited for products that require a high rate of deployment with long service intervals. Using the “Multigas” feature, calibrations for various different gases can be integrated in a single sensor. Self-test features allow testing of the entire signal chain (from capture of the analogue signal through to amplification and A/D conversion, linearization and temperature compensation) while the sensor is in use – a great advantage when used in safety-critical applications. The high performance is chiefly due to the company’s CMO Sens technology. The sensor unit uses thermal measuring principles to achieve precise, rapid and reliable measurement of gas flow.