Uecd Gas Flows; Uecd Linearity; Uecd Detector Gas; Uecd Temperature - Agilent Technologies 7890 Series Advanced Operation Manual

uECD gas flows

Anode purge and makeup gas
Frit
PS
Valve
EPC Module
PS = Pressure Sensor

uECD linearity

uECD detector gas

uECD temperature

Advanced Operation Manual
Restrictor
Restrictor
Column
The uECD response factor versus concentration curve is
linear for four orders of magnitude or more (linear dynamic
4
range = 10 or higher) for a broad range of compounds. You
should still run a calibration curve on your samples to find
the limits of the linear range for your materials.
The uECD operates with either nitrogen or argon/methane as
the makeup and anode gas. Purity is critical; gases must
exceed 99.9995% purity.
Because of the high detector sensitivity, carrier and makeup
gas must be dry and oxygen- free. Moisture, chemical, and
oxygen traps in good condition should be installed in carrier
and makeup gas supply lines. Do not use plastic (including
PTFE) tubing, plastic- bodied traps, or O- ring seals.
To prevent peak tailing and to keep the cell clean, the
detector temperature should be set higher than the highest
oven temperature used—the setpoint should be based on the
Vent
Ni
63
Capillary adapter
5
Detectors
185