Electronic Flow Control Type 23 - Scion Instruments 436-GC Service Manual

436-GC/456-GC

Electronic Flow Control Type 23

EFC23 sets a required carrier flow into the Injector/Column system. A leak in the
system would be indicated to the user by a drop in inlet pressure.
This EFC type is designed specifically for the On Column injector to support its
various modes of operation. In simple terms it duplicates the behavior of the On
Column 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 EFC23 flow diagram shown below is an indication of the control
mechanism of this type of EFC module.
Optimized use:
For wide bore columns
Flow control, Including constant flow
Use with On Column/Flash Vaporization/SPI injectors
SCION Instruments
436-GC/456-GC Service Manual Revision B February 2019
730 Electronic Flow Control
Page: 137