Use life
Sensor heads have a finite life due to environmental exposure, chemical life and oxidation.
To ensure continuous uninterrupted operation, we recommend you replace sensor heads every two years or when the ‘sensor aging’ or ‘sensor failure’ diagnostics appear.
Higher exposure levels or harsh environments can significantly reduce a sensor head’s life expectancy.
Note: Sensor heads can degrade even when unused and in storage.
Accuracy
Individual sensor heads may vary in their readings for many factors, both environmental and related to the sensors themselves.
Calibration
Calibration and age is an important factor. Over time, and with use, the calibration drifts. Sensor heads or sensor modules should be regularly tested and calibrated to ensure their correct operation. Calibration conditions, such as humidity, will also affect readings if non-factory calibrations are performed.
External interference
Sensor heads have a clean stainless-steel mesh to filter out dusts. If this becomes dirty over time, the sensor head starts to read incorrectly and will need to be replaced. Target gases such as ozone are highly reactive. Ozone rapidly reacts with organic compounds and surfaces such as walls, flooring, plastic testing chambers and people. Concentration gradients are common in rooms and are greatly influenced by air movement and mixing. Concentrations may be lower near walls and surfaces or in areas with low air.
