The MH-Z19B infrared gas module is a small sensor that uses the non-dispersive infrared (NDIR) principle to detect the existence of CO2 in the air. The sensor is characterised by good selectivity and operates independently of oxygen. It has built-in temperature compensation and outputs the data via a UART or PWM output.
• Model: MH-Z19B • Target gas: CO2 • Operating voltage 4.5 - 5.5 V DC • Average current consumption: < 60 mA (@ 5 V) • Peak current: 150 mA (@ 5 V) • Interface level: 3.3 V (compatible with 5 V) • Measurement range: see data sheet • Output signal: UART(TTL interface level 3.3V), PWM, DAC (standard 0.4 - 2V) • Preheating time: 3 minutes • Response time T90< 120 s • Operating temperature: 0 - 50? • Operating humidity: 0 - 90% RH (no condensation) • Dimensions: approx. 39 x 20 x 9 mm
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