29
5.
Select mV Calibration (
→
→
→
→
F1:Calibrate
→
→
→
→
F1:mV
).
The display should now look something like this…
220.0mV1
Enter Value: 220.0
The current mV reading is shown on the top line.
The
smart
CHEM
-Titro
displays the same value on the second line, on the assumption that the
reading will be close to the expected calibration point.
6.
Enter the value of the calibration solution using the Numeric Keypad, and then press
. The
Automatic Stability Function will now show a and highlight any unstable readings…
220.0
mV1
Enter Value: 231.0
Waiting to Stabilise
When the Millivolt reading has stabilised, the unit will calibrate itself.
To calibrate immediately without waiting for complete stability, press
to disable the
Automatic Stability Function.
7.
The
smart
CHEM
-Titro
is now calibrated for mV and is ready for use in this mode. Discard
the used samples of standard.
Rinse the Redox sensor in distilled water and blot dry before placing into unknown samples.
5.3 mV Calibration Notes
1.
DO NOT
place the sensor directly into stock bottles of standard. Decant a small quantity and
discard after use.
2.
Redox standards are highly unstable. Discard immediately after use
.
3.
A mV calibration should be performed at least weekly. In applications where the electrode
junction can become blocked such as dairy products, mining slurries etc, a 1 point calibration
may have to be done daily.
4.
All calibration information is retained in memory when the
smart
CHEM
-Titro
is switched off,
even when the power supply is removed. This information can be recalled or printed later using
the GLP function (see section 10).
