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SIARETRON 1000 – 1100 - 3000
Service Manual
3.5.1 Operation description
O2 INLET – AIR INLET Medical gas inlets (Medical OXYGEN and AIR, coming from the central piping system
or from cylinders).
PR1 - PR2. Pressure reducers. They have the function to reduce the inlet gas pressure to the stable value of
approx. 2.6 bar.
PSW1 - PSW2. Pressure switches. They have the function of signaling the eventual gas failure or low gas
pressure.
CSV1. Circuit selecting valve. It has the function to guarantee the operation of pneumatic devices supplied by
PR3 reducer also with only one gas in the inlet.
PR3 Pressure reducer. It has the function to reduce the pressure of the gas coming from CSV1 to the stable
value of approx.1.5 bar.
Only for SIARETRON 1000 and SIARETRON 3000
EV PART 1 O2 - EV PART 2 AIR. 12 V Pilot electrovalve. These valves are supplied from PR3 and have the
function to control the opening and closure of pneumatic by-passes for the measurement of flows over 15 l/min.
(see description of gas proportioning assembly). They are controlled by microprocessor.
EV PROP 1 INSP O2 - EV PROP 2 INSP AIR. 6V 0-120 l/min proportional electro valves. These valves regulate
the gas delivered to the patient allowing to control both the O2-AIR concentration and the FLOW. They are
controlled by microprocessor through a feedback system on the flow guaranteed by PS1 and PS2 flow sensors
Only for SIARETRON 1000 and SIARETRON 3000
R1.1 - R1 - R2.1 - R2. Pneumatic resistances. They are made of holes calibrated in accordance to the function
of distributing the flow coming from the proportional valves.
When the flow is lower or equal to 15 l/min the EV PART 1 and 2 valves are excited and the communication
with R1 and R2 is interrupted. In this way the flow will completely pass through the PS1 and PS2 sensors for
measurement.
When the flow is higher than 15 l/min the EV PART 1 and 2 valves are disexcited and the communication with
R1 and R2 is open. The special connection between the holes' diameters and the form of channels, permit to a
know portion of the flow to bypass PS1 and PS2 and to the remaining part to pass through them for the
measurement. In this way it is possible to measure the flow since from 0.1 to 99 l/min with sensors from 0.1 to
15 l/min.
AIR SAFETY VALVE. Unidirectional mechanic valve. It has the function to allow to the patient to breath ambient
air in emergency case. It opens with a depression of approx. 2 mBar.
OXIGEN SENSOR. It has the function of measure the real oxygen concentration delivered to the patient.
AIRWAY PRESSURE TRANSDUCER. Pressure transducer with semiconductor. It has the function to
continuously measure the pressure inside the breathing circuit.
SIARETRON_SE3_en
13 / (72 )
( rev.3) 30.06.2004
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