19
Alarms and Limits
Alarms and Limits
The Model 7500FO is equipped with audio and visual alarm indicators to alert the operator to
provide immediate patient attention or to abnormal device conditions.
The intended operator’s position for correctly perceiving a visual alarm signal and its priority is
1 meter (3.3 feet), per IEC 60601-1-8.
High Priority Alarms
High priority alarms require immediate attention to the patient. They include SpO
2,
pulse rate, and
low perfusion alarms. On the Model 7500FO, high priority alarms are indicated by a rapidly
blinking red Alarm Bar LED when the value is equal to or greater than the alarm limit. In addition,
the pulse strength bargraph LED illuminates a red segment to indicate low perfusion.
High priority alarms are sounded as follows: three beeps, pause, two beeps and a
10 second pause.
Medium Priority Alarms
Medium priority alarms signal potential problems with the equipment or other non-life-threatening
situations. On the Model 7500FO, medium priority alarms are indicated with a slowly blinking
amber Alarm Bar LED.
Medium priority alarms are illuminated amber on the Alarm Bar LED and on the appropriate
indicator(s) or numeric displays, sometimes displaying an error code to help the user identify the
source of the error.
Medium priority alarms are sounded as three beeps and a 25-second pause.
Watchdog Alarms
Watchdog alarms are loud, two-tone, steadily beeping signals that indicate a hardware or software
malfunction. When a watchdog alarm is activated, it can be cleared by shutting down the Model
7500FO. If the watchdog alarm cannot be cleared, remove power and contact your distributor or
Nonin Technical Service.
Informational Tones
Informational tones communicate important information. They are typically single beeps or a
series of three beeps. Informational tones include the startup/initialization tone and the pulse rate
tone (which changes in pitch with SpO
2
values: higher tones for higher SpO
2
, and lower tones for
lower SpO
2
).