Winsen MH-Z14A
Manufacturer-verified NDIR CO₂ sensing product.
Key Specifications
Product Positioning
Winsen MH-Z14A is an NDIR CO₂ sensor or OEM sensing module from WINSEN.
MH-Z14A: Communication and Calibration Checks
Range selection: The MH-Z14A listing describes 400–10,000 ppm options. Confirm the specific configured full scale rather than treating every module as a fixed 10,000 ppm output; setpoint resolution and controller scaling depend on the ordered or configured range.
Dual output paths: UART and PWM are not interchangeable electrical signals. A serial host must implement the proper message framing and checksum; a PWM host must time duty/period according to the maker’s output definition. Validate both at known CO₂ concentrations instead of inferring they will agree automatically.
Accuracy: The cited ±50 ppm + 5% reading has a fixed and proportional component. Confirm test conditions, warm-up time, automatic baseline behavior and the actual calibration method for installations that may stay at elevated CO₂ for long periods.
Deployment: Plan airflow exposure, condensation control and sensor replacement access before embedding the module in an enclosure.
Official Resources
Use the manufacturer’s current documentation as the authoritative source.
View WINSEN Official ResourceAirAlign is independent and is not affiliated with WINSEN.
Winsen MH-Z14A — discontinued high-range OEM NDIR CO₂ — sourced technical review
Manufacturer model- and order-code-specific measurements, electrical parameters and lifecycle differences. Avoid extending published values to physically different revisions and newer successor families.
| Specification | Original manufacturer evidence | Design caveat |
|---|---|---|
| Lifecycle | Official Winsen product page explicitly says discontinued, recommends reviewing MH-Z16 | Retain legacy documentation, but do not present MH-Z14A as a newly produced OEM option. |
| Measured gas | NDIR CO₂ with gold-coated optical chamber and temperature correction | Not a VOC equivalent CO₂ sensor or O₂ depletion measurement. |
| Ordering concentration bands | 400–2,000/5,000/10,000ppm configurable production variants | Board range must match exact archived product code and firmware. |
| Original formula | ±(50ppm +5% reading); 1ppm display resolution | Display resolution must not be confused with 1ppm accuracy. |
| Electrical supply | 5.0±0.1V DC, UART/PWM outputs | Do not wire discontinued PCB to 24V PLC or infer newer successor pin equivalence. |
| T90 | <120s manufacturer gas step reference | Sampling faster cannot eliminate optical chamber diffusion response. |
| Package | 57.15×34.7×14.5mm | Significantly larger footprint than MH-Z19 family. |
| Storage and application | Indoor HVAC, classrooms and ventilation OEM designs | Legacy parts need serial/firmware check and manufacturer approved replacement plan. |
OEM integration, calibration and product lifecycle
Winsen’s current listing marks MH-Z14A discontinued and directs buyers to the MH-Z16 class. That does not establish mechanical drop-in, firmware compatibility or the same pressure/gas range on MH-Z16. For maintenance, preserve calibration constants, check UART commands and PWM mapping and implement a controlled replacement qualification. The cited error expression includes a large 5%-of-reading term; deploying the module in a high-CO₂ control environment requires an independent reference instrument. A bare OEM module does not meet complete worker safety or hazardous area requirements by itself.
Model-specific primary material: Manufacturer-hosted model details or manufacturer data reproduced by technical distributor. Cross-check current exact order code and installation requirements.
AirAlign independent editorial enrichment · 25 October 2026. OEM values are not finished instrument certification, new part availability or assurance of original image rights.