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CP-1177 Pneumatics
CP-1177 Electronic Flow Control
The Electronic Flow Control module used on a CP-1177 injector is identified
as a type 1 EFC. This EFC type is designed specifically for the CP-1177 and
1079 injectors to support their various modes of operation. In simple terms it
duplicates the behavior of the Split/Splitless manual pneumatics system in
that there is an inlet mass flow controller supplying carrier gas to the injector
and a pressure control valve downstream from the injector which sets the
injector pressure. As injector pressure determines the rate of carrier gas
flow through the column, this pressure is monitored close to the point of
injection. The type 1 EFC flow diagram shown below is an indication of the
control mechanism of this type of EFC module.
Figure 3 Type 1 EFC Flow Diagram
Type 1 EFC allows the user set constant injector pressure or constant flow.
In addition the split ratio can be programmed.
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