Hach-Lange SI628 C - Manual (Page 21)

17
4. Operation
ENGLISH
Note: In calibration the instrument is in Hold state:
• Contact relays are opened.
• Current output is fixed at 21 mA.
To quit the Hold estate it is necessary to return to MEASURE.
4.5. Calibration
With the calibration the instrument adapts to the cell
and its variations with time. Therefore a periodical cali-
bration is necessary.
Calibration can be carried out with 1 or 2 standards,
to be selected between: 147 µS/cm, 1413 µS/cm or
12.88 mS/cm. If it appears an anomaly during the
calibration process an error message will be displayed
(see page 22).
If the cell constant value is exactly known, it can be
manually entered (see page 16) avoiding the cali-
bration procedure.
starts calibration with the standard 147 µS/cm.
selects the next standard, 1413 µS/cm, to perform
calibration.
Theoretical value of the standard at the calibration
temperature.
starts calibration with standard 1413 µS/cm.
selects the next standard, 12.88 mS/cm, to perform
calibration.
Calibration can be carried out with 1 or 2 standards. If the
calibration is with only one standard, press
.
P1, first standard used. C1, cell constant.
If the calibration was with 2 standards, press
to display
P2 and C2.
CAL. 23.2°C
1364 µS/cm
CALIBRATE
CODE 000
MEASURING 22.3°C
545 µS/cm @25°
23.2°C
Standard 147 µS/cm
CAL. 23.2°C
142.6 µS/cm
If you have a cell
without CAT, manually
enter the temperature
value.
Once the reading
is stable, the
display changes
automatically.
23.2°C
Standard 1413 µS/cm
P
1
=147,0 µS/cm
C
1
=0,393 cm
-1
Introduce the code
100.
P
2
=1413,0 µS/cm
C
2
=0,397 cm
-1
23.2°C
Standard 12.88 mS/cm
Press to
perform
calibration with
this standard.
to MEASURE
si628 C_HACH LANGE_Ed. 0510.indd ANG:17 si628 C_HACH LANGE_Ed. 0510.indd ANG:17 20/5/10 11:08:46 20/5/10 11:08:46