SKU: SENS-0924
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Winsen MH-Z14A IR CO2 Sensor Module - UART/Analog/PWM Output

₹3,396.00 (Inclusive of all taxes)
Out of Stock

The Winsen MH-Z14A is a non-dispersive infrared (NDIR) carbon dioxide sensor module offering UART serial, analog voltage, and PWM output interfaces, designed for integration with microcontrollers like Arduino, Raspberry Pi, and industrial PLCs for precise CO2 concentration measurement.

Features

  • NDIR sensing principle ensures high selectivity and long-term stability with no oxygen dependence.
  • Triple-output interface: UART serial communication, 0-3V analog voltage, and configurable PWM waveform.
  • Built-in temperature compensation for accurate readings across varying environmental conditions.
  • Compact PCB module with pre-calibrated sensing element for easy system integration.
  • Low power consumption suitable for continuous monitoring in HVAC, IAQ, and industrial safety applications.

Out of stock

Description

The MH-Z14A employs non-dispersive infrared (NDIR) technology to detect carbon dioxide concentrations in ambient air. Its optical path and infrared detector are engineered for high sensitivity and resolution, providing reliable measurements from 0 to 5000 ppm (or up to 10000 ppm depending on configuration). The module features sophisticated signal conditioning circuitry that outputs data via a user-selectable interface.

Designed for durability, the sensor includes compensation for environmental variables and is resistant to water vapor interference, ensuring stable performance in applications ranging from commercial building automation to agricultural monitoring. Its digital UART output allows for direct communication with host processors, while the analog and PWM outputs provide compatibility with standard data acquisition systems.

Key Features

  • High-precision NDIR CO2 sensing with excellent long-term stability and >5-year service life.
  • Flexible output selection: TTL-level UART (9600 bps default), 0-3V analog linear output, and duty-cycle PWM.
  • Integrated temperature compensation circuit minimizes measurement drift across operating conditions.
  • Compact, low-profile PCB design (57.5mm x 34.5mm) for space-constrained installations.
  • Low average current consumption enables use in portable or battery-powered monitoring devices.
  • Robust construction with anti-interference design for reliable operation in humid environments (0-95% RH).
  • Pre-calibrated at factory, supporting both manual background calibration and automatic baseline correction.

Applications

  • Demand-controlled ventilation (DCV) and HVAC system efficiency optimization.
  • Indoor air quality (IAQ) monitoring in offices, schools, and smart buildings.
  • Greenhouse and agricultural environment control for CO2 fertilization management.
  • Industrial safety and process monitoring in breweries, wineries, and pharmaceutical production.
  • Portable air quality assessment devices and environmental data loggers.

Technical Specifications

Manufacturer Part NumberMH-Z14A
Sensor TypeNon-Dispersive Infrared (NDIR) CO2 Sensor
Measurement Range0-5000 ppm (standard; other ranges available)
Output InterfacesUART (TTL), Analog Voltage (0-3V), PWM
Supply Voltage4.5 - 5.5 V DC
Average Current< 60 mA (typical)
Operating Temperature0 - 50 °C (typical)
Operating Humidity0 - 95% RH (non-condensing)
Preheat Time~3 minutes
Response Time< 90 seconds (T90)
Accuracy± (50 ppm + 3% of reading)
Dimensions (L x W)57.5 mm x 34.5 mm
Weight17 g
Lifetime>5 years

Frequently Asked Questions

What are the output interfaces on the MH-Z14A sensor and how do I select one?

The MH-Z14A provides three output modes: UART serial (TTL level, default 9600 bps), a 0-3V analog voltage linearly proportional to CO2 concentration, and a PWM signal where duty cycle corresponds to ppm value. Selection is typically made via a Jumper or solder pad configuration on the module's PCB. Refer to the datasheet for the specific pin mapping and configuration method for your module variant.

What is the required warm-up time and calibration procedure?

The sensor requires approximately 3 minutes of preheat time after power-on for stable readings. It comes factory calibrated. For long-term accuracy, manual background calibration can be performed by exposing the sensor to fresh outdoor air (approx. 400 ppm CO2) and sending a calibration command via UART. Automatic Baseline Correction (ABC) is also supported in some firmware versions, which periodically adjusts the baseline over a multi-day period.

How do I interface the MH-Z14A with an Arduino or Raspberry Pi?

For UART communication, connect the module's TX/RX pins to a microcontroller's serial port (e.g., Arduino SoftwareSerial). For analog output, connect the analog pin to an ADC input. For PWM, connect to a digital input capable of pulse width measurement. Ensure a stable 5V power supply. Libraries are available for Arduino to simplify reading and converting the UART or PWM data into ppm values.

What is the measurement range and accuracy of this CO2 sensor?

The standard measurement range is 0 to 5000 ppm CO2 concentration. Typical accuracy is ±(50 ppm + 3% of reading) under specified conditions. The sensor utilizes NDIR technology, which provides good selectivity against other gases and long-term stability with minimal drift compared to electrochemical sensors.

Package Includes

  • 1 x Winsen MH-Z14A Infrared CO2 Sensor Module

Additional Information

Weight 0.017 kg
Dimensions 5.75 × 3.45 cm