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PRESSURE PULSES CAN CAUSE FALSE ALARMS TO O2 SENSORSSeptember 2023, MARIETTA, GA ~ Oxygen Sensors are sensitive to pressure:The output from partial pressure sensors is 100% proportional to the ambient pressure; therefore, changes in atmospheric pressure can produce false alarms. For example, if the pressure increased by 15 kPa (i.e. 15% increase at an ambient pressure of 1 atmosphere) then the oxygen sensor output will increase by 15%: from 20.9% to 24% oxygen, causing the gas detector to alarm. The output from mass flow-controlled sensors (including the most of our oxygen sensors) are not 100% proportional to the ambient pressure, showing a much reduced pressure effect: about 7% dependent; for example, a 15 kPa pressure change (i.e. 15% pressure increase) will cause the sensor output to increase by 7% of 15%: a 1.05% output increase from 20.9 to 21.1% oxygen, avoiding an alarm. However, mass flow oxygen sensors show transient behavior when subjected to a rapid change in ambient pressure. Rapid pressure changes can occur in several situations: • If a portable safety instrument is placed in the trunk of the car and the lid is clos...
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