Metrohm 732 IC Detector User Manual
Page 62
3.3 Putting into operation
732 IC Detector / 733 IC Separation Center
55
ENTER
⇒
Confirm the selected measuring range by pressing the
<ENTER> key.
>PARAM/detector
full scale: 200
µµS/cm
The next inquiry which appears concerns the full-scale
range. The full-scale range (operating range) is used to set
the desired sensitivity for the display and analog output of
the measuring signal during the recording of the chroma-
togram. This value is set using the <FULL SCALE> key,
but not until later (see section 3.4, point 2
2).
ENTER
⇒
Confirm the preset value corresponding to the measuring
range by pressing the <ENTER> key.
>PARAM/detector
temp.coeff.: 2.5 %/°C
The next inquiry concerns the temperature coefficient for
the automatic conversion of the conductivity from the oper-
ating temperature of the measuring cell to the reference
temperature of 20° C. The preset value of
"
2.5 %/°C
"
ap-
plies to anions, the value applicable to cations
"
1.5 %/°C
"
can be selected by pressing the <SELECT> key.
ENTER
⇒
Confirm the preset value for anions by pressing the
<ENTER> key.
8 Enter parameters for analog output
PARAM
>PARAM/analog output
After the last action of point 7, the title of the submenu
"a
nalog output
”
appears.
ENTER
⇒
Press the <ENTER> key to move to the inquiries.
>PARAM/analog output
polarity: +
The polarity of the analog output signal can be switched
with the <SELECT> key between
"
+
"
and
"
–
"
. To ensure
that a positive signal is always outputted for peaks, nor-
mally
"
+
"
is used for the determination of anions and
"
–
"
for that of cations.
ENTER
⇒
Confirm the correct polarity
"
+
"
for our example with the
<ENTER> key.
>PARAM/analog output
offset: 0 %fs
The second inquiry concerns the offset of the analog
output signal. This offset of the zero point of the conductiv-
ity can be set to 10 % or 50 % of the full-scale range using
the <SELECT> key. Such an offset of the zero point is pri-
marily advisable when the integrator or the evaluation sys-
tem do not accept any negative voltage values. As this is
not the case for «IC Metrodata for Win95», the value can be
left at
"
0 %fs
"
.
ENTER
⇒
Confirm the preset value with the <ENTER> key.