64
Siemens-Elema AB
E382 E380E 061 01 03 01
Description of functions
Servo Ventilator 300/300A
2
8.10 Pressure amplifier
The
PRESSURE
AMPLIFIER
amplifies the input
signal from 8.4
SUPPLY
PRESSURE
TRANSDUCER
.
The output signal from this amplifier,
representing the relative gas supply
pressure, is used in:
• 8.11
PRESSURE
CALCULATOR
to calculate the
absolute pressure of the gas
• 8.12
SUPPLY
PRESSURE
AMPLIFIER
.
8.11 Pressure calculator
The
PRESSURE
CALCULATOR
calculates the sum
of:
• Gas pressure (input from 8.10
PRESSURE
AMPLIFIER
) and
• Barometer pressure (input from 4.6
BAROMETER
PRESSURE
TRANSDUCER
).
The result of this calculation is the absolute
pressure of the gas.
Output signals from the pressure calculator
are used in:
• 8.15
FLOW
CALCULATOR
• 8.18
VALVE
POSITION
CALCULATOR
.
8.12 Supply pressure amplifier
The relative gas supply pressure, input signal
from 8.10
PRESSURE
AMPLIFIER
, is amplified in
the
SUPPLY
PRESSURE
AMPLIFIER
.
Output signals from this block is used in:
• 4
MONITORING
to show the corresponding
relative gas supply pressure on the front
panel
• 8.13
DELTA
PRESSURE
AMPLIFIER
.
8.13 Delta pressure amplifier
The input signal from 8.5
DELTA
PRESSURE
TRANSDUCER
is amplified in the
DELTA
PRESSURE
AMPLIFIER
. The output signal is influenced by
the relative gas supply pressure value from
8.12
SUPPLY
PRESSURE
AMPLIFIER
as well as from
8.3
INSPIRATORY
VALVE
TEMPERATURE
SENSOR
.
The potentiometer at the top of the
INSPIRATORY
VALVE
UNIT
implies a limited
(approx. ± 3%) adjustment possibility of this
signal. This signal is not a directly
proportional part of the flow and
no
service
adjustment must be made. If the
INSPIRATORY
VALVE
UNIT
proves to be out of specification it
is recommended -for safety reason- to
exchange it.
The output signal is used in 8.15
FLOW
CALCULATOR
.
8.14 Zero offset
The possible offset of the pressure drop
signal, measured by 8.5
DELTA
PRESSURE
TRANSDUCER
, is set to zero in the beginning of
each breath cycle, i. e. when the flow
through the inspiratory valve is zero.
The block
ZERO
OFFSET
deliveres an offset
compensation voltage to 8.13
DELTA
PRESSURE
AMPLIFIER
. The zeroing function is controlled
from 15.4
VALVE
ZEROING
.
Содержание Servo Ventilator 300
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