Using the device outside the specified temperature range (typically from 0 to +40 °C) is not recommended.
At subzero temperatures, sensor sensitivity decreases, measurement error increases, and malfunctions in electronics or power supply may occur.
To ensure proper operation in cold conditions, a special thermal cover should be used to maintain the internal temperature at no less than +15 °C.
For access control system (ACS) breathalyzers, thermal enclosures are available, which extend the operating range down to -40 °C.