This document describes the features and characteristics of Sensirion's CMOSens® EM1 Mass Flow Meter for Gases, including unbeatable price/performance ratio, high output data speed, wide dynamic range, digital calibration and temperature compensation. The product is suitable for applications such as process control, medical applications, and fuel cells.
The CMOSens® EM1 Mass Flow Meter provides fast, high‑performance gas flow measurement with a wide dynamic range (1:100) and 3 % m.v. accuracy. It integrates a sensor element, amplification and A/D conversion on a single CMOS chip, delivering up to 200 Hz output data speed and supporting both RS232 and SPI digital interfaces.
The device operates from 7 V to 18 VDC, tolerates pressures up to 8 bar (116 psi), and is RoHS compliant. Detailed specifications, pin‑out, communication protocols and configuration commands are provided for integration into process‑control, medical or fuel‑cell applications.
| Flow range | 0 – 200 ln/min (depending on version) |
|---|---|
| Accuracy | 3 % m.v. (typical) |
| Output data speed | up to 200 Hz |
| Supply voltage | 7 V – 18 V DC |
| Digital interfaces | RS232 and SPI |
The EM1 can output data at up to 200 Hz.
The device provides both a bi‑directional RS232 interface and a uni‑directional SPI interface.
It operates from 7 V to 18 V DC.