Sensor CO2 (400-5000ppm) por infravervelhos de tipo SCD41 com comunicação I2C - DFRobot SEN0536

Referência : SEN08081

69,90 €

preço com IVA incluído

O CO2 é um fator-chave para a qualidade do ar interior, uma vez que níveis elevados comprometem o desempenho cognitivo e o bem-estar do ser humano.

Este Gravity: SCD41 CO2 é baseado no sensor de CO2 miniatura SCD41 da Sensirion. O SCD41 baseia-se no princípio de deteção fotoacústico NDIR e na tecnologia patenteada PAsens e CMOSens da Sensirion para oferecer uma elevada precisão a um preço inigualável e no mais pequeno formato.

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Introduction

CO2 is a key factor for indoor air quality as high levels compromise human cognitive performance and well-being.

This Gravity: SCD41 CO2 sensor is based on the SCD41 miniature CO2 sensor from Sensirion. SCD41 builds on the photoacoustic NDIR sensing principle and Sensirion’s patented PAsens® and CMOSens® technology to offer high accuracy at an unmatched price and the smallest form factor. On-chip signal compensation is realized with the built-in temperature and humidity sensor, while temperature and humidity data outputs are also available.

SCD41 sensor detects the amount of energy that is absorbed by CO2 molecules. When pulsing the infrared emitter, CO2 molecules absorb infrared light periodically. This causes additional molecular vibration resulting in a pressure wave inside the measurement chamber. The higher the CO2 concentration, the more light is absorbed, and thus the greater the amplitude of this acoustic wave becomes. A microphone inside the gas chamber measures this, from which the CO2 concentration can then be calculated.

Click to learn more about PAsens® technology.

Click to learn more about NDIR sensors.

Gravity: SCD41 Infrared CO2 Sensor - I2C

Gravity CO2 Sensor Selection Guide

Product Name	Gravity: Analog Electrochemistry CO2 Sensor	Gravity: Analog IR CO2 Sensor	Gravity: UART IR CO2 Sensor	Gravity: I2C SCD41 Infrared CO2 Sensor (400 - 5000 ppm)
SKU	SEN0159	SEN0219	SEN0220	SEN0536
Operation Voltage	3.7～5V	4.5～5.5V	4.5～5.5V	3.3V-5V
Output	Gravity: Analog (Analog2.7～4.1V) + 3P Header Digital Output(Alarm):0～VCC Level	Gravity: Analog (Analog Output 0.4～2V)	Gravity: UART (0～3.3V Level)	Gravity: I2C
Measurement Principle	Electrochemistry （Solid electrolyte battery principle）	NDIR(non-dispersive infrared)	NDIR(non-dispersive infrared)	photoacoustic NDIR
Measurement Range	0～10000 ppm	0～5000 ppm	0～50000 ppm	400～5000ppm
Accuracy	±100ppm@400ppm	±(100ppm + 6% readings)	±(100ppm + 6% readings)	±(40 ppm + 5% MV)
Response Time	<20s	<90s	<30s	60S
Average Power	<1W	<430mW@5V	<430mW@5V	<30mW@5V
Operation Temperature	-20℃～50℃	0℃～50℃	0℃～50℃	-10℃～60℃
Operation Humidity	0～95% RH (No condensation)	0～95% RH (No condensation)	0～95% RH (No condensation)	0～95% RH (No condensation)
Lifespan	>1 year	>5 years	>5 years	>10 years
Dimension (PCB)	32*42 mm	37*69 mm	21*27.1 mm	32278mm
Features	1. Large Range 2. Adjustable Alarm Threshold 3. Fast Response 4. Analog Output	1. High Accuracy 2. Long Lifespan 3. Auto Temperature Compensation 4. Water Vapor Interference Resistance 5. Ananglog Output	1. High Accuracy 2. Large Range 3. Long Lifespan 4. Auto Temperature Compensation 5. Water Vapor Interference Resistance 6.3.3V UART Output	1.CO2, temperature, and humidity, three in one 2. Small size of 32278mm 3. Low power, average current＜4mA