- -
15
4.6.4. “
Reset
Std. glass electrode
”: It restores the standard pH measurement
functioning and disables the special electrode measurement correction.
Note
: The “
Set Antimony Electrode
” function activation or the modification of the
submenu items, will erase the current calibration.
W
hen exiting the menu,
you should
perform a new calibration
.
5.
“CONDUCTIVITY OPTIONS”
5.1. “
Cond
.
ALFA Coefficient
” (
α
T
):
The temperature coefficient
α
T
is the percentage
measurement of the conductivity variation according to temperature and is expressed
in %/°C (or %/°F). The coefficient may vary from 0.00 to 4.00%/°C. Use the arrows (
and
) to set the desired coefficient, and confirm with ENTER.
5.2. “
Reference Temperature
”: It indicates the temperature to which the displayed
conductivity value is standardized. The values vary from 0 to 50°C.
Usually the values
of 20°C or 25°C are used
. Use the arrows (
and
) to set the desired value, and
confirm with ENTER.
5.3. “
Conductivity TDS
”: It represents the
χ
/TDS conversion factor, that is,
the ratio
between the measured conductivity value and the total quantity of dissolved
solids in the solution
, expressed in mg/l (ppm) or g/l (ppt). This conversion factor
depends on the nature of the salts present in the solution. In the field of water quality
treatment and control, the main component is CaCO
3
(Calcium Carbonate). For this
solution, a value of 0.5 is usually used. In agriculture, for fertilizer water preparation,
and in hydroponics, a factor of about 0.7 is used. Using the arrows (
and
), set the
desired value, selecting it in the 0.4…0.8 range, and confirm with ENTER.
6. “
DISSOLVED OXYGEN OPTIONS
”
6.1. “
View Oxy History
”: The dissolved Oxygen probe SICRAM module stores the last eight
calibrations in the memory. This menu item displays each calibration date and slope.
The “
Print Oxygen History
” function, gives the date, slope and temperature per each
calibration.
6.2. “
Oxy Calibration validity
”: It is possible to set the dissolved Oxygen probe calibration
validity number of days. When the validity period has expired, the measurement is
blinking on the display and by pressing the DISP key the “CAL” blinking message
appears; the calibration data can still be used. The “Expired calibration” message is
indicated in the printout. Enter “Number of days” = 0 to disable this feature.
Note: The day is counted at midnight: By entering 1, at midnight of the same day, the
calibration is considered expired.
This operation can be carried out only by the administrator (see page
17
).
6.3. “
Reset Calibration History
”: This function clears the dissolved Oxygen probe calibration
information (see “Dissolved Oxygen Probe Calibration History” above). Press ENTER
to erase, ESC to exit without erasing.
This operation can be carried out only by the administrator (see page
17
).
6.4. “
Salinity Correction
”: Enter the measured liquid salinity. Use the
and
arrows to set
the value expressed in g/l, and confirm with ENTER. To disable the salinity
compensation, set the value to zero.
Note: The dissolved Oxygen concentration depends on the measured liquid salinity. In
contrast, salinity has no effect on the saturation index.
6.5. “
Automatic Salinity Correction
”: The salinity value is measured directly by the
instrument, if a conductivity probe is connected and immersed in the measured liquid.
Select “0” to manually set the correction using the “Manual Setting of the Salinity” menu
item, select “1” to enable automatic correction.
