Selecting the range
The detector amplifier can be switched in a maximum
of nine ranges to enable optimum processing of the
large dynamic response of the detector signal. These
ranges each differ by a factor of 2. The dynamic re-
sponse within a range is approx. 10
6
.
The range is selected once according to the measure-
ment. It can also be switched over from the time pro-
gram. Thus detector signals can be measured with a
dynamic response of almost nine decades.
Select the function Signals in the selection display.
Move the cursor for the desired channel to the line Set
range. Enter the desired value using the digit keys, and
confirm with .
Input limits for range
FID
FPD
TCD
ECD
0 ... 8
0 ... 8
0 ... 4
0 ... 8
Baseline monitoring
The chromatograph monitors the detector baselines.
The chromatograph signals a fault if the set limits are
violated (see Section Status and alarms).
This monitoring function can be used to determine
whether e.g. the flame of the FID is still alight or
whether a detector is highly contaminated.
Select the function Signals in the selection display, and
move the cursor to the desired input field. Enter the
zero limits as an attenuation (-21 to 21) which must not
be fallen below or exceeded.
NOTE:
This monitoring function is only effective during the run and
only in the areas in which the peak recognition does not find
any peaks.
If you do not require this monitoring function, enter -21 for the
lower zero limit and 21 for the upper zero limit.
RETURN
Detectors
6
5DETEKTO.CHP, Stand Dezember 22, 1999
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