3Flex Service Manual
Gas Inlet Subsystem
Aug 2013
2-15
Gas Inlet Subsystem
The Gas Inlet manifold provides six gas inlet ports (12 when Chemi option is installed) at the rear of
the instrument, a servo valve connected to the dosing manifold, and a vacuum valve connected to the
vacuum subsystem. The inlets have dust filters (frits) to prevent particles from entering the valve
system.
The servo valve is stainless steel and similar to the one used in the 2480.
Direct control of the servo valve voltage is provided via a DAC at the hardware/software interface
instead of the previously used analog comparator to the manifold pressure transducer signal.
You can use the servo valve to manually backfill the analysis manifold or a sample port.
Servo valve
Gas Inlet manifold
Six more inlets added
here when Chemi
option is installed.
