LTV 1200 Operator's Manual - CareFusion Emergency Preparedness

Symptoms Possible Causes What to Do
Vent Inop Alarm Test
Confirming audible
chirp does not sound.
Test Lung Operations
Audible alarm did not sound
long enough before test
was terminated.
Internal problem with the
ventilator.
Symptoms Possible Causes What to Do
Delivered pressure
higher than set
pressure on test lung.
Monitored volumes
very high on test lung.
Pressure> 40 cmH2O used
on small test lung
(Pulmonetic Systems or
Siemens 190.)
Test lung with small
aperture connected directly
to wye.
Very small ET tube
connected directly to wye.
Repeat the Vent Inop Alarm Test and allow
audible alarm to sound for at least 15
seconds before pushing the Silence Reset
button. (See Chapter 11 - Vent Inop Alarm
Test for instructions.)
Immediately contact a certified Pulmonetic
Systems’ service technician.
The compliance characteristics of some
small test lungs (Pulmonetic Systems or
Siemens 190) cause incorrect readings
when high pressures are used. For these
lungs, use pressures under 40 cmH2O or
change to a larger lung.
Some test lungs have a narrow opening or
a restrictor, which may cause jetting and
cause the flow differential to be read
incorrectly. To reduce the jetting effect,
add a short extension between the test
lung and the wye.
A very small ET tube connected directly to
the wye may cause jetting and cause the
flow differential to be read incorrectly. To
reduce the jetting effect, add a short larger
bore extension between the ET tube and
the wye.
Page 15-26 LTV ® 1200 Ventilator Operator’s Manual
p/n 18247-001, Rev. G