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94
Alarm System Delay
The alarm system has an inherent delay between the two components, as shown
in Figure 125:
• T2-T1:
The time it takes for a safety sensor in the pump to detect an alarm ≤0.1s.
• T3-T2:
The amount of time between detecting an alarm and issuing an alarm
signal within the pump ≤0.1s.
• T4-T3:
The time it takes for the pump to send the alarm information wirelessly
to the PDA ≤ 4s.
• T5-T4:
The amount of time between when the PDA receives the alarm to issuing
the alarm signal ≤0.1s.
Figure 125
ALARM SIGNAL generation
Algorithm variable response
ALARMLIMIT
Instantaneous signal
from PATIENT
Nor
maliz
ed v
ar
iable
PH
YSIOL
OGIC
AL
ALARM C
ONDITION
Graphical Representation of Alarm Delay
The alarm system is distributed – if a pump sensor detects a problem it will issue an
alarm within 0.2 seconds. The PDA will receive the information and issue an alarm
within 4 seconds.
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