The blue alarm light can be on at the same time as the red or yellow alarm light. When a numeric
value becomes missing due to an INOP, the INOP alarm will be present as well as the patient
alarm (due to the missing value), with both originating from the same cause.
There is an alarm sound and an alarm light illumination delay of no more than 4 seconds following
the displayed alarm flag, provided that the alarm condition still exists after this delay.
Alarm Safety Information
Visual Alarm Indications
Depending upon the alarm condition, visual alarm indications can include an alarm flag, a
flashing numeric, and an illuminated alarm light; when multiple alarms are detected, multiple
visual indications may be presented.
Alarm flags are visual indicators that contain an alarm message displayed on a background color
that identifies the priority of the alarm (see table below). An alarm flag is displayed for the
duration of an alarm condition. Multiple alarm flags are displayed when multiple alarm
4‐2 Alarms Expression MR400 Instructions for Use
The monitor detects and responds almost immediately to most out-of-limits conditions,
except when averaging of the physiological signal is required to reduce unwanted noise
signals (for example, respiration rates and measurements derived from SpO2 signals.)
Set the alarm volume based upon the ambient noise levels in the MR environment.
Some areas in the MR environment, such as the MR system room, may have ambient
noise levels louder than the maximum volume of the MR400. Therefore, displayed data
should be continuously monitored. Otherwise, if sound was inaudible, treatment of the
patient could be delayed. For visual alarms, adjust the position of the MR400 so that
you maintain a clear view of the display.
High (patient alarm)
Medium (patient alarm)
INOP (status or technical alarm)
Displayed Background Color