Electronic Flow Control Type 21 - Scion Instruments 436-GC Service Manual

436-GC/456-GC

Electronic Flow Control Type 21

The EFC module used on an 1177 injector is the EFC21 or EFC25.
The EFC21 or EFC25 type is designed specifically for the split/splitless and PTV
injectors to support their various modes of operation. 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.
Type EFC21 allows the user to set constant injector pressure or constant flow. In
addition the split ratio can be programmed.
Flow Control Unit
Digital Flow Control
Carrier
Gas inlet
CMOSens
®
flow sensor
Pressure Control Unit
Digital Pressure Control
Optimized use:
For capillary columns
Flow & Pressure control
Split injection use with split/splitless injector
Splitless injection use with split/splitless injector
Split injection use with PTV injector
Splitless injection use with PTV injector
SCION Instruments
GC Control
P -Sensor
436-GC/456-GC Service Manual Revision B February 2019
EFC21
Molsieve/Charcoal
CP742210 (silver color)
Pencil
*
Filter
Charcoal
CP742211 (gold color)
Split Valve Pencil
Split
Line
*
Filter
Back Pressure
Controller
Split Vent
730 Electronic Flow Control
Injector
Septum
Purge Valve
column
Septum
Purge
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