Posifa PMFc700 Mass Air Flow Sensor — AWM700 Replacement
Manufacturer’s pin-compatible mass air-flow sensor alternative for Honeywell AWM700 series, including the AWM720P1 class. Typical 1 ms response, amplified analog output and manufacturer’s published PMFc720P1 part number with a full-scale range of 0–200 sccm (0.2 standard liters per minute). Compatibility must be checked against original device pinout and calibration.
Source and ordering verification
Original PMFc700 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.
PMFc700 — AWM700 replacement proof test
PMFc700 is marketed as an AWM700-family replacement and the PMFc720P1 appears as a 0–200 sccm model. Mechanical pin correspondence alone does not establish identical transfer function, gas calibration, supply, output loading or pressure drop in the existing instrument. Verify the Posifa replacement drawing against the exact Honeywell part being removed and bench-calibrate at multiple points. The photo shown from the PMF4000 sibling is not a PMFc700 model image.
PMFc700 — legacy Honeywell AWM700 replacement qualification
| Specification / variant | Manufacturer evidence | Engineering decision |
|---|---|---|
| Form-fit intention | PMFc700 engineered as pin-compatible / calibration-compatible option for selected Honeywell AWM700 series devices, including AWM720P1 family | Check the *exact* Honeywell subpart and Posifa option; pin compatibility is not proof of identical pressure drop or all-range output. |
| Signal and dynamics | Amplified analog output about 5 V full scale, MEMS pair of thermopiles, approximately 1 ms response | Do not apply PMF4A00 signed 3-V midpoint or PMF6000 I²C register mapping. |
| Interchangeability figures | Posifa April 2020 maker sheet describes interchangeability under 2% full scale; optional tighter 1.5% class, thermal error below 3%FS from 0 to +50°C | These are specified component conditions, not unconditional assembled apparatus accuracy. |
| Flow capacities | Custom full-scale classes 50–200 SLM described in maker documentation | Read actual calibration curve and part suffix from current order; one ±% figure does not set a universal SLM range. |
| Environmental limits | Operating -25…+85°C; storage -40…+90°C; maximum common-mode pressure 25 psi | Confirm compatibility with real carrier gas and system contamination and media filter. |
Exact SKU and system qualification
Manufacturer’s PDF depicts the PMFc700 exact geometry, whereas the current AirAlign photo is an explicitly labelled sibling PMF4000 image. Do not present the latter as the actual replacement model. Perform a bench-equivalence study across zero, midspan, full scale and humidity conditions before changing devices.
Original manufacturer references: Posifa PMFc700 April 2020 OEM data sheet.