Μecd Gas Flows; Μecd Linearity; Μecd Detector Gas - Agilent Technologies 7820A Advanced User's Manual

5
Detectors
µECD gas flows
Anode purge
Makeup
Frit
Valve
Frit
PS = Pressure Sensor
µECD linearity
µECD detector gas
82
Frit Frit
Valve Valve
PS PS
Frit
The µECD response factor versus concentration curve is linear
for four orders of magnitude or more (linear dynamic range =
4
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 µECD 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.
EPC Module
PS
Column
Vent
63 Ni
Capillary adapter
Advanced User Guide