LTV 1200 Operator's Manual - AARC.org

Flashing ControlsVariable controls and alarms will be displayed solid or flashing. A flashing control means one of thefollowing things:• If you are changing a control setting, and the display flashes, you have reached a limited value forthe control. Control Limiting is covered later in this section.• If an alarm display flashes, it indicates that an alarm has occurred or is occurring. See Chapter 9 -Ventilator Alarms for more information on this.• If a control display flashes, it indicates a special condition such as time termination of a pressuresupport breath. For more information, see Chapter 6 - Controls.• If the Control Lock LED flashes, it indicates you have tried to change the control settings whilethe front panel controls are locked. For more information, see Chapter 6 - Controls, Control Lock.DashesIf a control display is set to dashes “ - - ”, it indicates that control is turned off, or is not available inthe current ventilation mode.Control LimitingVariable control settings may be limited to less than their specified range for any of the followingreasons:• To prevent inverse I:E ratios of greater than 4:1• To ensure a minimum inspiration time of 300 ms• To ensure a minimum exhalation time of 346 ms• To ensure a minimum initial flow of 10 lpm for Volume Controlled breaths• To ensure a maximum initial flow of 100 lpm for Volume Controlled breathsWhen you are updating a control and have reached a limited condition, the following things happen:• The control stops updating and will remain displayed at the highest (or lowest) allowed value.• The control display will flash.• The displays for other controls involved in the limited condition will flash.To set the control to a value outside the limited range, you will need to change the settings for othercontrols involved in the limit condition. For instance, if the Breath Rate is set to 12, the maximumallowed Inspiratory Time is 4.0 seconds. To set the Inspiratory Time to more than 4.0 seconds, youmust first decrease the Breath Rate.Operator’s Manual LTV ® 1200 Ventilator Page 5-5p/n 18247-001, Rev. E