Metrohm 732 IC Detector - Manual (Page 66)

3.4 Calibration
732 IC Detector / 733 IC Separation Center
59
3.4 Calibration
After putting into operation and conditioning the IC system as de-
scribed in section 3.3, the first calibration can now be performed. This
requires a standard solution which contains the analyte substances in
about the same concentration as expected in the sample.
For our example dealing with the determination of drinking water with
the PRP-X100 IC Anion Column, a 100 µ L sample loop is used which is
filled with the following standard solution:
5 ppm Cl – , 10 ppm NO
3
– , 10 ppm SO
4
2–
(as Na + or K + salts in dist. water)
1 Select status message for full-scale range
SELECT
⇒ Repeatedly press the key until the statusmessage for the full-scale range appears. 151.2 µµS/cm 54.9 minfull scale 200 µµS/cmThe full-scale range currently in force appears in thebottom line of the display.2 Set full-scale rangeSCALEFULL⇒ Press the key. 151.2 µµS/cm 55.2 minfull scale: 200 µµS/cmThe numeric value of the full-scale range start to flash. Thisindicates that the setting here must be made with the<ç> and <è> keys and not as is normal with the key.
The full-scale range (operating range) is used to set the
message for the full-scale range appears.
151.2 µµS/cm 54.9 min
full scale 200 µµS/cm
The full-scale range currently in force appears in the
bottom line of the display.
2 Set full-scale range
SCALE
FULL
⇒ Press the key.
151.2 µµS/cm 55.2 min
full scale: 200 µµS/cm
The numeric value of the full-scale range start to flash. This
indicates that the setting here must be made with the
<ç> and <è> keys and not as is normal with the
desired sensitivity for the display and the analog output of
the measuring signal during the recording of the chroma-
togram. The range should be so selected that the largest
peaks which need to be evaluated are clearly within the full-
scale range.
. - /+
⇒ Change the full-scale range by pressing the <ç> key
(value decremented) or the <è> key (value incremented)
until the desired value appears in the display.
151.2 µµS/cm 55.8 min
full scale: 4.00 µµS/cm
For the determination of anions in drinking water, a full-
scale range of 4 µ S/cm is selected.
ENTER
⇒ Confirm the desired full-scale range with the
key.
151.2 µµS/cm 56.1 min
full scale: 4.00 µµS/cm
The 732 IC Detector is again in the standby mode and the
display shows the status message for the full-scale range,
but now the numeric value no longer flashes.