Servo Ventilator 300/300A
Description of functions
E382 E380E 061 01 03 01
Siemens-Elema AB
45
2
4.2 Inputs interface & A/D
Multiplexor and analog to digital conversion
stages for input signals to the main block
4
MONITORING
.
4.3 Sound & Alarm control
Alarm control circuits including the driving
stage for the block 4.7
LOUDSPEAKER
.
4.4 Flow filters & Integrators
The input signals
AIR
FLOW
and
O
2
FLOW
are
added to generate
INSP
.
FLOW
(block internal
signal
INSP
.
FLOW
SUM
).
The difference between the signals
INSP
.
FLOW
SUM
and
EXP
.
FLOW
generates the signal
AIRWAY
FLOW
(= block internal signal
EXP
.
FLOW
INT
.) as well as the signals
INSP
.
FLOW
PATIENT
and
EXP
.
FLOW
PATIENT
. This way of calculating
is necessary to achieve the last two
mentioned signals of patient flow during
EXPIRATION
TIME
when a constant flow to the
patient system is generated via the
inspiratory valve(valves).
Integration during each breath of the signal
INSP
.
FLOW
SUM
generates
INSP
.
TIDAL
VOL
. The
signal
INSP
.
FLOW
PATIENT
is averaged to
generate
INSP
.
MIN
.
VOL
.
Integration during each breath of the signal
EXP
.
FLOW
INT
. generates
EXP
.
TIDAL
VOL
. The
signal
EXP
.
FLOW
PATIENT
is averaged to
generate
EXP
.
MIN
.
VOL
.
Some of the signals are used for monitor/
alarm within this main block, some of them
used for mode regulation algorithms by the
block 6.1
MODE
CPU
and some of them
displayed on the front panel. The signals
INSP
.
FLOW
PATIENT
and
EXP
.
FLOW
PATIENT
are
available at the 3.6
ANALOG
I
/
O
TERMINAL
.
4.5 Backup alarm system
The internal power supply voltages are
monitored in this block. If any of the voltage
limits are exceeded, the supply voltage alarm
is activated by the signal
POWER
_
FAILURE
.
H
.
The parameters
AIRWAY
PRESSURE
(upper alarm
limit) and
O
2
CONC
and
EXP
.
MINUTE
VOLUME
are
monitored (analog monitoring) at somewhat
wider alarm limits than the corresponding
digital monitoring function of the block 4.1
MONITOR
/
ALARM
CPU
. This block activates an
alarm only if the regular (digital) alarm
system is failing.
This block includes the driving stage for the
block 4.8
BEEPER
.
Active backup alarm consists of intermittent
(in some case continuos) audible alarm
generated by means of the 4.8
BEEPER
.
Preconditions for backup alarm: Alarm
condition mentioned below is fullfilled
and
normal (digital control) alarm is not active. In
this connection the normal alarm is
considered not active also in case of
loudspeaker error (indicated via the Loud-
speaker supervisor function connected to
the Sound generation function in the block
4.3
SOUND
&
ALARM
CONTROL
).
Special condition leading to active Backup
alarm is mentioned under 4.1
MONITOR
/
ALARM
CPU
.
The Backup alarm system contains the
following different
PMA = Parameter Monitored
for Alarm
. Each alarm table contains
conditions for alarm.
Содержание Servo Ventilator 300
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