ADJUSTMENT OF DETECTORS
All detector parameters are adjusted using the control
unit. You can find more details in Register 5: Detectors.
Change to operating mode Maintenance single run.
Check the analysis parameters. A method is not in-
stalled in the chromatograph if the function displays
do not show any valves, detectors, temperatures,
etc. You must install the methods. Refer to register
Operation with keyboard and screen.
Select the function Signals in the selection display.
– Switch off the baseline correction
– Select the function Without compensation
– With TCD: select the polarity according to the
application data
With TCD: initial adjustment
Follow the instructions under Adjustment of TCD:
Switching-on of bridge current and Adjustment of
measuring bridge.
Stabilization of
operating temperatures
Please observe: With
PGC 302
the FID and TCD do not
have their own heaters. They are heated together with
the oven. It takes 60 to 90 minutes until the oven tem-
perature has stabilized.
Checking the gas flows
Once the oven and detectors have reached the operating
temperatures, measure the carrier gas, combustion gas
and combustion air exhausts at the detector output.
Compare the flows with the application data and correct
if necessary using the fine pressure regulator.
Adjustment of FID, FPD, ECD or HID
Now follow the complete instructions under Adjustment
of FID and FPD, Adjustment of ECD or Adjustment of
HID.
With TCD: final adjustment
Follow the instructions under Adjustment of TCD: Ad-
justment of measuring bridge.
Finished!!!
Adjustment of TCD
Switching-on of bridge current
Already switch the bridge current on when the
oven/TCD is cold. The bridge current additionally
warms up the TCD and is stabilized together with the
oven temperature. Select the function Signals in the se-
lection display.
Set the bridge current according to the application
data
Switch on the bridge current. Observe the detector
signal on the screen. It must change when the
bridge current is switched on.
Adjustment of measuring bridge
Select the function Autozero. Observe the detector sig-
nal on the screen. It becomes zero.
Adjustment
of bridge limit temperature
The bridge temperature is monitored by the detector
electronics. If the temperature is too high, the detector
electronics switches off the bridge current and signals
an alarm. The bridge limit temperature can only be set
in the configuration using the editor.
Commissioning and shutting down
4
4INBETR.CHP, Stand Dezember 22, 1999
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