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2.3.3 Flowmeter Subsystem
The flowmeter subsystem is mainly used to control the flow of fresh gas and also provides
backup flow control in case of power failure. It consists of the EFCS assembly and BFCS
assembly.
2.3.3.1 EFCS Assembly
The EFCS assembly is used for electronic regulation and monitoring feedback on the flows of the
O2, air, and N2O branches. In addition, it controls the gas mixing ratio, outputs single or mixed
gas, and displays it on the screen. The pneumatic diagram of the EFCS assembly is shown below.
Figure 13 Pneumatic diagram of the EFCS assembly
The EFCS assembly consists of the inlet assembly, outlet assembly, flow sensors (12.5, 12.13,
and 12.14), and pressure sensor (12.15), to control O2, air, and N2O supply separately. In
addition, it provides the input interface and on-off control for the BFCS assembly. The structural
diagram of the EFCS assembly is shown below.
Figure 14 Structural diagram of the EFCS assembly
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