Frequently Asked Questions

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FAQ Knowledge

Keeping low CO2 level is important for human health, which not only means that the current environment has sufficient fresh air, but also greatly reduce the risk of building syndrome. Winsen CO2 sensor meets RESET standard, which is widely used in control panels or thermostats for HVAC systems.

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Frequent Asked Questions

Generally an LPG sensor works like a combustable gas sensor in that it is sensitive to not just LPG but other flamable gases as well. (Natural, Methane, Coal gas, butane etc...) It works by comparing a change in resistance between two heated elements. One heated element is a reference that is isolated from the sample gas. The other element is identical except that it is exposed to the sample. 

Catalytic oxidation of the target gas contained in the sample causes an increase in heat and a corresponding change in resistance. The two heated resistive elements are part of a balanced wheatstone bridge. The changes in resistance between these cause an imbalance in resistance and a change in current flow in the bridge that can be measured as a voltage. 

The voltage can then be measured by an ADC and computed into a ppm value by a microcontroller for display.

In clean air of temperature 20℃±2℃ and humidity 65%±5%RH.

Warm-up Time: The time cost from sensor power on to the sensor output vale is stable.
Response Time: The time cost of 90% stable sensor output value, under step changes of the detection gas concentration in testing conditions.

MP series advantage: Smaller size, lower power consumption, better consistency and shock resistance performance.
MQ series advantage: Good stability, longer lifespan

Under normal conditions, the expected life of MQ series sensors is more than 10 years.
The actual lifespan depends on the application environment and the using methods.

Under normal conditions, the expected life of MP series sensors is more than 5 years.
The actual lifespan depends on the application environment and the using methods.

ppm: parts per million
VOL: volume ratio
LEL: lower explosive limit
NDIR: Non-Dispersive Infra-Red



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