Hoffrichter CARAT I, Руководство по обслуживанию

Страница: 11 / 41

- 11 -
5.2 POwER MAnAgEMEnT CIRCuIT BOARD
Functions:
1. Current measurement and allocation of the available current according to the priority
2. Display of the operating condition
3. Determining the capacitance and state of charge of the internal battery
4. Charge the internal battery
5. Transmission of the “battery-data” to the processor to be shown on the display
5.3 InTERnAL BATTERy
The internal battery comprises of two Lithium-Ion batteries (Pana CRg 18650 CF) that are con-
nected to a 28.8 V, 2.25 Ah manifold.
5.4 FAn BOx
The fan is installed in the fan box and the fan comprises of a Direct Current (DC) motor from the firm
Maxon (50 W, with high uniform speed) and a fan impeller (D = 49 mm).
5.5 VALVE MAnIFOLD
The valve manifold comprises of the following components as described and serves as the control
and transfer, as the case may be, between inspiration and expiration. The valve manifold is directly
connected (by a seal) with the fan box. The oxygen feed is through the valve manifold into the inspi-
ration sector.
5.5.1 VALVE BASE
The valve base comprises of several control ducts that are shut with special seals, a non-return
valve in the inspiration sector and a proportion valve.
The valve base is bolted to the sensor manifold. The sealing is by O-rings.
There is a connection for the oxygen tube on the valve base.
5.5.2 SEnSOR MAnIFOLD
The pneumatic control for the inspiration and the expiration is done through the sensor manifold.
This function is done by two diaphragms (one each in the inspiration and expiration sector). The
diaphragms are inserted in the manifold and subsequently the valve cap installed and closed by
turning the bayonet connection. The sealing is by an O-ring.
5.5.3 FLOW SEnSORS
For the measurement of the flow, airflow sensors AWM720P1 from the firm Honeywell are used.
The sensors are directly in the inspiration and expiration sector (with seals between the manifold
and tube connection).
There is only one sensor installed (inspiration sector) in the CARAT I machine.