Winsen MH-Z19D
Manufacturer-verified NDIR CO₂ sensing product.
Key Specifications
Product Positioning
Winsen MH-Z19D is an NDIR CO₂ sensor or OEM sensing module from WINSEN.
Official Resources
Use the manufacturer’s current documentation as the authoritative source.
View WINSEN Official ResourceAirAlign is independent and is not affiliated with WINSEN.
MH-Z19D — verify revision rather than copying MH-Z19B
The MH-Z19D is identified as an NDIR CO₂ module with UART and PWM interfaces. The current AirAlign source does not establish its exact range, tolerance or serial framing, so do not copy those values from MH-Z19B or MH-Z19C. For replacement work, request the latest MH-Z19D datasheet and compare operating voltage, connector, command set, configured CO₂ span, start-up and baseline calibration behavior. A visually similar NDIR product is not evidence of firmware or mechanical interchangeability.
Winsen MH-Z19D — direct manufacturer revision and electrical verification — engineering selection and model documentation
The published manufacturer values below are bounded to their orderable range, test conditions and actual interface, not general guarantees about every relative in the same sensor family.
| Parameter | Manufacturer evidence | Engineering boundary |
|---|---|---|
| Sensing mechanism | Temperature-compensated NDIR CO₂ optical module | Not equivalent CO₂ inferred from oxidizable volatile gases. |
| Variant span | 400–2,000, 5,000 or 10,000 ppm original maker ordering table | The listed family up to 10kppm does not prove every hardware module is factory-calibrated to 10k. |
| Accuracy / resolution | ±(50 ppm +5% measured CO₂), 1ppm reported resolution | Do not mistake one display count for one ppm absolute accuracy. |
| Electrical power | 5.0 ±0.1 V DC, <40mA average, 125mA peak | Regulator pulse response is mandatory even with low mean draw. |
| Output protocol | 3.3V TTL UART (5V-tolerant per model page) and PWM | No inherent 24 V, native RS485 or 4–20mA. |
| Timing | ~1-minute preheat, T90 <120 s response | Reporting interval and gas diffusion are separate. |
| Environment and life | 0–50°C, 0–95%RH noncondensing; >5 years expected design life | MH-Z19C may have a different low-temperature statement; compare exact revision. |
System integration and calibration
The updated MH-Z19D is similar mechanically to MH-Z19C but the producer’s current D page defines 0–50°C ambient and specific factory 2k/5k/10k ordered ranges. A swap requires review of UART command mapping, startup behavior and internal ABC settings, not only identical 32.9×19.7×8.6mm size. Production CO₂-enriched zones and 24/7 rooms may defeat assumed clean-air calibration; establish a reference calibration procedure and supervise the CO₂ module separately from any personnel safety alarm.
Source and exact-order documentation: Original manufacturer catalogue, page and/or technical data sheet. Any version- or test-bound claim must be checked against the supplied production label before procurement.
AirAlign model-specific technical editorial update · 25 October 2026. These OEM values are not independently calibrated, certified, or evidence of active supplier stock.