Posifa PMFc3000 Low-Flow MEMS Mass Air Flow Sensor
PMFc3100V: 200 sccm full scale; PMFc3300V: 1,000 sccm full scale. Analog output, approximately 5 ms response, manufacturer-listed typical supply 10 V within 6–16 V range. Flow-range and pressure-drop differences must follow the individual ordered variant.
Source and ordering verification
Original PMFc3000 manufacturer datasheet · Manufacturer’s current documentation index.
Safety distinction: This OEM flow component is not presented as an ATEX or IECEx approved finished gas detection device. Check the exact model, flow direction, electrical signal and calibration medium before substitution.
PMFc3000 — low-flow sccm versus SLPM
PMFc3000 includes PMFc3100V around 200 sccm and PMFc3300V around 1,000 sccm full scale. At these low ranges, tubing leakage, mechanical bypass and the actual gas calibration can dominate end-device error. Select the specific analog host supply and pressure drop for the chosen variant; a family 5 ms response time is distinct from the host sample period. A photograph of the PMF2000 technology family must not be taken as an exact PMFc3000 mechanical drawing.
PMFc3000 — two low-flow curves; non-linear voltage mapping
| Specification / variant | Manufacturer evidence | Engineering decision |
|---|---|---|
| Two orderable full-scale versions | PMFc3100V: 0–200 sccm; PMFc3300V: 0–1,000 sccm, per Jan 2021 Rev B/C1 data sheet | The same 5 V full-scale output does not mean the same sccm conversion. |
| Actual PMFc3100V output points | 0: 1.00 V; 50 sccm: 2.67 V; 100 sccm: 3.75 V; 200 sccm: 5.00 V | Mapping is visibly nonlinear; do not use linear interpolation from 1 V zero to 5 V full-scale for accurate low-flow readings. |
| Actual PMFc3300V output points | 0: 1.00 V; 100: 2.30 V; 500: 4.18 V; 1,000 sccm: 5.00 V | Implement source lookup/interpolation for the delivered suffix with actual gas calibration. |
| Electrical operation | 6–16 VDC, 10 V recommended, 22–24 mA, response 5 ms | Analog 1–5 V host ADC must tolerate 5 V output; this is not a direct digital-I²C interface. |
| Hydraulic pressure loss | PMFc3300V typical pressure drop ~900 Pa at 1,000 sccm; common-mode 25–100 psi listed | Pressure-drop and common-mode ratings are distinct. Check the pump’s available differential head. |
Exact SKU and system qualification
Manufacturer full-scale table and voltage-versus-flow table (dated Jan 2021 Rev B/C1) must be used as a pair. Relative gas composition and calibration standard sccm conditions can change flow indication.
Original manufacturer references: Posifa PMFc3000 Jan 2021 Rev B/C1 OEM datasheet.