2 If an inspiratory lockout is not activated, rotate the inspiratory
time-limit stem further counterclockwise.
(d) Watch the test gauge, push the reset button, and observe the
1 The test gauge registers a pressure of approximately 45psig.
2 The ventilator then cycles once, enters into a lockout again,
followed by an audible alarm.
3 Inspiratory lockout occurred between 12 to 14psig on test gauge.
4 The alarm was activated between 8 and 10psig.
(e) To adjust the lockout pressure, use a 3/32 inch Allen wrench to
rotate the adjustment screw located in the end of the compound-lockout cartridge (refer
to figure 2-2, point C). A clockwise rotation increases the pressure at which a lockout
(f) If lockout occurs between 12 to 14psig, followed by an audible
alarm, turn off the source gas to remove the test gauge so the plug may be reinstalled
into the valve. However, if the above parameters are not met, troubleshoot the
assembly before continuing.
(g) Use the procedures outlined in Table 2-11 to troubleshoot the
inspiratory lockout (compound-lockout cartridge).
(10) Inspiratory time limit.
(a) Rotate the mode selector to SPONTANEOUS BREATHING ON.
Ensure the inspiratory time-limit stem is fully clockwise and adjust the expiratory flow
gradient control knob to obtain a zero reading on the manometer.
(b) Use a 1/2-inch open-end wrench to remove only the retention cap
on the inspiratory time-limit valve. Install a cam-stop washer (P/N 4021) followed by a
single cam stop (P/N 4020). Finger tighten the retention cap onto the valve body.
(c) Rotate the Mark 2 inspiratory-time stem fully clockwise, then
counterclockwise 1/4 to 1/2 turn.
(d) Turn the source gas on and rotate the mode selector to
CONTROLLED IMV ON. Check for flow set at 10 lpm. Push the reset button and
ensure inspiratory time is 7 seconds or more.