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testo 300: testo 300 Smart-Touch combustion analyzer combines O₂/CO flue measurements with on-device job documentation. The referenced 0633 3002 70.
A vacuum reading that rises after the pump is isolated does not automatically prove a refrigerant leak. Remaining moisture can evaporate, trapped gas.
Slow refrigeration evacuation may result from moisture, a restriction in the evacuation path, leaks, a poorly performing pump or a vacuum gauge placed.
CO2 can rise quickly in a meeting room when occupants generate carbon dioxide faster than outside air replaces or dilutes it. Small room volume, high.
Two CO2 meters can disagree because they sample different air, respond at different speeds, or have different calibration, sensor performance and.
A rising differential pressure across a filter often indicates increasing resistance to airflow, but the same reading must be interpreted alongside air.