Adjustment of FID and FPD
Ignition of detector
Select the function Signals in the selection display, and
observe the detector signal there. The detector signal
must rise following ignition. This detector signal is the
detector baseline current. Select the function Without
compensation.
Checking of baseline current
If you are using a conditioned column, you must wait
approx. 30 minutes until the column has stabilized and
a stable baseline current has been set. Compare the cur-
rent with the application data.
If the value is significantly larger than that in the appli-
cation data, check the oven temperature and whether
the gases and piping are clean (the flame should be
colourless).
Compensation of baseline current
Select the function Autozero. Observe the detector sig-
nal on the screen. It becomes zero.
Adjustment of ECD
Adjustment of reference current
Select the function Signals in the selection display, and
set the reference current according to the application
data (standard is 100%).
The detector signal decreases and becomes constant
after a while. If you put in commission the ECD for the
first time this takes some hours till some days because
all pipes have to become free of hydrogen and oxygen.
Finally the detector signal should be less than 2 kHz.
Compensation of baseline current
Select the function Autozero. Observe the detector sig-
nal on the screen. It becomes zero.
Select attenuation
Select the attenuation according to the application data
sheets.
CAUTION: Radioaktive!
The ECD is a radiator and is subject to
governmental supervision. Observe the
regulations!
Route all exhaust gases via a common line
out of the chromatograph and away from the
position of use.
Observe the maximum operating temper-
ature of this detector!
Commissioning and shutting down
4INBETR.CHP, Stand Dezember 22, 1999
5
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