The environment of agricultural greenhouses and building management is harsh on electronic components and makes maintenance work difficult. Accordingly, measured values are prone to deviation. Therefore, there is value to the features of durability and maintenance-free automatic calibration.
In the case of atmospheric calibration (ABC system) for which the minimum concentration is deemed to be 400 ppm and the concentration calibration curve is corrected in environments where the concentration drops to the outdoor air level (approximately 400 ppm) at night or during ventilation, there is an issue in that it is not possible to use this system in agricultural greenhouses, which are very different from human living environments. That is because the minimum concentration in agricultural greenhouses is lower than the outside air level due to the photosynthesis of plants.
Moreover, the tendency for drift remains even if forcibly reset due to the deterioration of the optical path and the photodetector. Murata Manufacturing's CO2 sensors employ a dual wavelength calibration system that allows the reset of the tendency for drift in the light source, optical path, and photodetector in addition to the values.
[In the case of conventional CO2 sensors]
- Sensor values are unstable
- Support representatives from sales companies visit the farmers and companies to calibrate and replace the sensors
- Customers contact support centers to request maintenance
- Sales companies incur expenses to operate customer centers and maintain sensors
[In the case of Murata's CO2 sensors]
- Sensor values are accurate and do not drift
- There is a drastic reduction in support operations by sales companies
- There are no maintenance requests from customers
- Sales companies can significantly reduce the expenses they incur to operate customer centers and maintain sensors