PMF4000 Mass Air Flow Sensor
The PMF4000 series uses Posifa’s third-generation thermal flow die with dual thermopiles to sense temperature-gradient changes caused by mass flow, delivering excellent signal-to-noise and repeatability. A solid-state thermal isolation structure avoids surface cavities or fragile membranes, improving resistance to clogging and pressure shock. Versions include analog output (PMF4000V) and I²C digital (PMF4000D), with linearized, temperature-compensated output for ease of use and max flow options from 12 SLM to 300 SLM.
Key Specifications and Benefits:
- Unsurpassed performance in a robust and cost-effective package
- Solid-state sensing core resistant to clogging and pressure shock
- Highly accurate (4 % reading typ.)
- Fast response time (5 ms typ.)
- Linear output and temperature compensation
- Long-term stability with minimal null drift
- Wiring harness with pre-installed receptacle (analog version only)
Applications
- Oxygen concentrators
- Respirators and ventilators
- Nebulizers
- CPAP equipment
- Anesthesia delivery
- Leak detection
- Spectroscopy
- Mass flow controllers
- Fuel cell controls
Absolute Maximum Ratings / Operating Limits
- Operating temperature: −25 °C to 85 °C
- Calibrated temperature range: 0 °C to 50 °C
- Storage temperature: −40 °C to 90 °C
- Humidity: 0 % to 100 % RH, non-condensing
- Shock: 100 g peak (5 drops, 3 axis)
- Operating pressure: 25 psi