Airon pNeuton A, Operator'S Manual

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pNeuton Ventilator 7 - 11
The remote output uses a normally closed signal output
with a resistance of 51K Ohms. When an alarm occurs,
the signal output opens to infinite resistance. This is a
passive remote alarm output that does not provide its own
electrical signal. Use the Airon Remote Alarm (Part
number 21031) to provide a remote audible and visual
indication of active alarm conditions.
Low Gas Supply Alarm
The Low Gas Supply Alarm will occur if the driving gas
supply drops below safe levels (30 psi, 200 kPa). The
alarm activates as long as driving gas is available or until
the supply pressure returns to normal.
When operating from an oxygen cylinder the ventilator will
gradually use up the gas in the cylinder and tank pressure
will fall. Once the cylinder pressure reaches approximately
500 psi, most portable tank regulators will start to decrease
pressure to the ventilator during mandatory breaths. As
this happens that Low Gas Supply Alarm will sense the
decreased pressure and begin to intermittently alarm each
time the pressure drops during inspiration. As pressure in
the cylinder falls to lower values, the amount of time the
regulator is delivering low pressure increases and the
alarm sounds longer. Eventually the regulator is unable to
maintain pressure and the alarm will sound continuously
until all gas in the cylinder is used.
WARNING: The Low Gas Supply Alarm will only
activate for a very short period of time if the gas supply
abruptly ceases. This can occur if operating from a wall
source and the gas supply hose is disconnected from the
gas supply outlet. In fact, the Low Gas Supply Alarm may
not sound at all when the ventilator is disconnected from a
wall source. This is because all gas in the high pressure
hose immediately exits out from where the hose was
connected to the outlet and there is no gas pressure to