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<ul><li>The -Z19C carbon dioxide gas sensor (hereinafter referred to as the sensor) is a general-purpose intelligent small sensor that uses the principle of non-dispersive infrared (NDIR) to detect the presence of C02 in the air. 
Built-in temperature compensation: simultaneously has serial output, PWM output, easy to use. The sensor is a high-performance sensor made by closely combining infrared absorption gas detection technology with sophisticated optical circuit design and sophisticated circuit design. 
Detection gas:carbon dioxide 
Power supply voltage:DC (5.00.1) V 
Average current:Less than 40mA (@5V power supply) 
current:125 to (@5V power supply) 
Interface level:3.3v(compatible with 5v) 
Measuring range:400-5000PPM optional 
Output signal:serial UART(TL level 3.3V) 
Warm-up time:1min 
Response time:T90 Less than 120s 
Working temperature:-10-50 
Working humidity:0-95%RH(no condensation) 
Pin 
Vin:Power +(in) 
GND:power supply-(GND) 
PWM:PWM 
Hd:HD (zero calibration, low level is effective for more than 7 seconds) 
Rx:UART (RXD) TTL level data input 
Tx:UART (TXD) TTL level data output 
Output : 
PWM output 
Assume the measurement range is 400-2000ppm 
CO2:Concentration output range: 400-2000ppm 
Period:1004ms5% 
High level output at the beginning of the cycle: 2ms (theoretical value) 
Central period:1000ms5% 
Low level output at of the period: 2ms (theoretical value) 
Calculation formula for obtaining current CO2 concentration value by PWM: Cppm=2000X (TH-2ms)/(TH+TL-4ms) 
Cppm: CO2 concentration value calculated by the unit of ppm 
TH: the time when the output is high level in one output cycle 
TL: the time when the output is low in one output cycle 
Due to different product batches, the appearance , which does not affect the use. 
Colour:As Shown 
Material:PC+Aluminum Alloy 
Package Contents: 
1 * CO2 Sensor Module 
Only the above package content, other products are not included. 
Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.</li></ul>

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-Z19 -Z19C IR Infrared CO2 Sensor Module Carbon Dioxide Gas Sensor NDIR Accessories

The -Z19C carbon dioxide gas sensor (hereinafter referred to as the sensor) is a general-purpose intelligent small sensor that uses the principle of non-dispersive infrared (NDIR) to detect the presence of C02 in the air. 
Built-in temperature compensation: simultaneously has serial output, PWM output, easy to use. The sensor is a high-performance sensor made by closely combining infrared absorption gas detection technology with sophisticated optical circuit design and sophisticated circuit design. 
Detection gas:carbon dioxide 
Power supply voltage:DC (5.00.1) V 
Average current:Less than 40mA (@5V power supply) 
current:125 to (@5V power supply) 
Interface level:3.3v(compatible with 5v) 
Measuring range:400-5000PPM optional 
Output signal:serial UART(TL level 3.3V) 
Warm-up time:1min 
Response time:T90 Less than 120s 
Working temperature:-10-50 
Working humidity:0-95%RH(no condensation) 
Pin 
Vin:Power +(in) 
GND:power supply-(GND) 
PWM:PWM 
Hd:HD (zero calibration, low level is effective for more than 7 seconds) 
Rx:UART (RXD) TTL level data input 
Tx:UART (TXD) TTL level data output 
Output : 
PWM output 
Assume the measurement range is 400-2000ppm 
CO2:Concentration output range: 400-2000ppm 
Period:1004ms5% 
High level output at the beginning of the cycle: 2ms (theoretical value) 
Central period:1000ms5% 
Low level output at of the period: 2ms (theoretical value) 
Calculation formula for obtaining current CO2 concentration value by PWM: Cppm=2000X (TH-2ms)/(TH+TL-4ms) 
Cppm: CO2 concentration value calculated by the unit of ppm 
TH: the time when the output is high level in one output cycle 
TL: the time when the output is low in one output cycle 
Due to different product batches, the appearance , which does not affect the use. 
Colour:As Shown 
Material:PC+Aluminum Alloy 
Package Contents: 
1 * CO2 Sensor Module 
Only the above package content, other products are not included. 
Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.