Winsen MH-Z19B
Manufacturer-verified NDIR CO₂ sensor module. Specifications below are taken from Winsen’s official product information.
Key Specifications
Product Positioning
Winsen MH-Z19B is an NDIR CO₂ sensing product from Winsen intended for OEM gas measurement and system integration.
Official Resources
For integration and purchasing decisions, verify the current documentation directly with Winsen.
View Winsen MH-Z19B Official PageAirAlign is an independent informational resource and is not affiliated with Winsen. Manufacturer documentation remains authoritative.
MH-Z19B — legacy NDIR integration differences
MH-Z19B is a UART/PWM NDIR CO₂ family with 400–2,000, 5,000 or 10,000 ppm range options and a longer listed preheat than the MH-Z19C example. Verify physical connector, serial commands, PWM period and selected range before replacing a B or C revision. The quoted ±(50 ppm + 5% of reading) figure should be interpreted under its original conditions and calibrated baseline assumptions. The 4.5–5.5 V supply and non-condensing exposure requirement should be included in an OEM board and enclosure design.
Winsen MH-Z19B — discontinued NDIR module, avoid new-design promotion — model evidence and engineering selection
Current original manufacturer information differentiates optical design, gas span, data interfaces, revision-specific power and calibration assumptions.
| Characteristic | Source-backed detail | Selection consequence |
|---|---|---|
| Lifecycle | Winsen marks the MH-Z19B model discontinued | Treat as installed-base repair or legacy reference, not active new production. |
| Measurement principle | Temperature-compensated NDIR CO₂; non-oxygen-dependent optical process | Does not detect O₂ or flammable gas. |
| Span choices | 400–2,000/5,000/10,000ppm order variants | Selection is model configuration, not guaranteed precise 0–10kppm on any used sensor. |
| Maker uncertainty | ±(50ppm +5% reading) | At 1,000ppm nominal expression ≈±100ppm, not the newer S12’s ±60ppm. |
| Electrical supply | 4.5–5.5V DC, <20mA average and about 150mA peak | Host regulator and logic-level UART must handle emission pulse. |
| Signal formats | 3.3V UART (5V-compatible I/O stated by maker) and PWM | No native analog 4–20mA or isolated Modbus RS485 industrial transmitter. |
| Startup / gas step | Three-minute preheat and T90 <120s | Do not substitute a newer MH-Z19C performance figure. |
| Environment | −10 to +50°C, 0–95%RH noncondensing, 32.9×19.7×8.6mm | Field condition and optical aging require calibration and availability checks. |
Firmware, operating environment and calibration
The official supplier now labels MH-Z19B discontinued. AirAlign retains this page so existing hardware can be serviced without confusing MH-Z19B with successor-series devices. Test firmware protocol, PWM scaling, pressure/temperature compensation and the ABC calibration algorithm before substituting a Z19C or Z19D; similar footprints do not prove direct command/behavior equivalence. The initial three-minute preheat is important for ventilation control: do not treat first powered measurements as stabilized truth. For always-high-CO₂ rooms, fresh-air ABC assumptions require special handling.
Original model source: Manufacturer technical model and its current product documents. Use current production suffix and calibrated configuration, not a parent-family estimate.
AirAlign editorial engineering review — 25 October 2026. OEM facts are not independent safety, media license or exact SKU procurement approval.