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Commissioning and shutting down
Adjustment of HID
Select drain voltage
In the
the switch for the drain voltage is lo-
RGC 202
cated on the right, near the needle valves. Select the
lower position. This corresponds to a drain voltage of
270 V.
Select attenuation 18 ... 20
and damping 4
Wait for stabilization
Depending on gas purity it takes at least 24 hours to
decrease the baseline to 50 % in attenuation 15. If this
cannot be reached please regenerate the gas purifier!
Increase drain voltage
In the
the switch for the drain voltage is lo-
RGC 202
cated on the right, near the needle valves. The upper
position corresponds to a drain voltage of 300 V. Please
select now 300 V. Thus the sensitivity of the HID is
increased.
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 (usually not lower than 9).
CAUTION: Radioaktive!
The HID is a radiator and is subject to
governmental
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!
6
supervision. Observe the
SHUTTING DOWN
The column and detector become least contaminated
when the chromatograph is kept in operation. Do not
switch off the chromatograph if the plant is shut down
for a short period (up to 3 weeks). Also leave the flames
on in the FID and FPD so that vaporized materials from
the column cannot condense. Only switch off the output
devices.
If the chromatograph is nevertheless to be shut down,
the following sequence is recommended:
If you have modified the original application data
and wish to use the chromatograph with these data
again, store them on the control unit and on a dis-
kette. Refer to register Operation with keyboard
and screen: Saving of methods on control unit
Switch off all sample streams. Purge the sample
lines if necessary, and blow the lines dry
Switch off the power supply
Switch off the combustion gas and combustion air
for the FID and FPD, and the purging gas for the
ECD
Allow the detectors and oven to cool down
Switch off the carrier gas
Close the detector outlets using a dummy plug. This
prevents contamination from entering the detectors
via the common exhaust gas line.
4INBETR.CHP, Stand Dezember 22, 1999
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