Metrohm 732 IC Detector - Manual (Page 105)

4 Operation
732 IC Detector / 733 IC Separation Center
98
>PARAM/detector
full scale: 1.00 mS/cm
0.05 µ S/cm … 10 mS/cm
Full-scale range (operating range)
The full-scale range (operating range) sets the desired
sensitivity for the display and analog output of the
measuring signal during the recording of a chroma-
togram. The following points should be noted:
• The possible values of the full-scale range which can
be selected with the <SELECT> key depend on the
preset measuring range " range " . This value can be
reduced in a total of 11 stages by a factor 1 (lowest
sensitivity) up to maximum a factor of 2000 (highest
sensitivity).
• The full-scale range is primarily used to increase the
sensitivity for the recording of the chromatogram
following the electronic background compensation of
the eluent sensitivity (auto-zero function, see also
description in section 4.6.3).
• For the selected full-scale range (FS), the linearity of
the conductivity measurement is assured in the
range -1.5 FS … +1.5 FS. If the measured value vio-
lates these limits, overload display 88 lights up, but
the measured value is still displayed. If the measured
value lies outside ± 1.8 FS, overload display 88 starts
to flash, at the same time display 11 shows the abso-
lute conductivity in place of the auto-zero value.
• The full-scale range determines the limits for the
output of the analog signal at analog outputs 11 11
(0 … 1 V) and 12 12 (0 … 10 mV). The polarity of the out-
put signal can be changed at any time with the pa-
rameter " polarity " to " + " (0 … +FS) or " – " (0 … –FS).
0
R
1.1 R
0
+ FS
– FS
+ 1.5 FS
+ 1.8 FS
– 1.5 FS
– 1.8 FS
0
+
–
0 V
1 V / 10 mV
1 V / 10 mV
Measuring range Full-scale range FS Analog output
Conductivity
Display
"
--------
"
Overload lit up
Overload flashes
Overload lit up
Overload flashes