Information display and control device of powered air purifying respirator
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United States of America Patent
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Oct 13, 2015
Grant Date -
May 16, 2013
app pub date -
Nov 9, 2012
filing date -
Nov 11, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An information display and control device of an air purifying respirator comprises: a blower motor; a pulse width modulation drive unit controlling rotation of the blower motor; a temperature sensor; an air flow sensor; an oxygen sensor; a voltage detection unit for a battery; a differential pressure sensor detecting a differential pressure value of a filter; a switch input unit for a user to input predetermined temperature, air flow, and oxygen amount and operation commands; a controller executing a diagnostic mode, calibrating the oxygen sensor, calculating a detected value of the voltage detection unit to determine whether the voltage is low, comparing the detected value of the differential pressure sensor with a reference to determine whether the filter is absent or clogged, and comparing the detected value of the oxygen sensor with a reference to determine whether oxygen is insufficient or excessive; and an alarm output unit outputting an alarm.
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