XS Instruments 50 Serie Betriebsanleitung Seite 19

• Calibration with manual values
Example two-point calibration pH 6.79 e pH 4.65 (DIN19267)
:
•
Access the Setup menu for pH and select in P1.1→ Custom, press twice the key
measurement and position in pH mode
•
Press to enter the calibration mode.
•
Rinse the electrode with distilled water and gently dab with paper towel. Dip the electrode in the first
pH buffer solution (e.g. pH 6.79).
•
Wait for the pH value on the display to stabilize; when the icon
modify it using the directional keys by entering the correct one (e.g. pH 6.79), as suggested by the
string "ADJUST THE VALUE" and by the icon
Note: Check the buffer value according to the temperature
•
When the icon appears again, press the key
value flashes on the display and the beaker icon appears with the buffer identification colour
•
Remove the electrode, rinse with distilled water, dab gently with paper towel and dip it in the next
buffer (e.g. pH 4.65).
•
Wait for the pH value on the display to stabilize; when the icon
flashes, modify it using the directional keys by entering the correct one (e.g. pH 4.65), as suggested by
the string "ADJUST THE VALUE" and by the icon
•
When the icon
measured value flashes on the display, the Slope% and, next to the first beaker, the icon with identifying
colour of the second buffer
•
At the end of the second calibration point, the instrument automatically returns to measure mode.
•
To perform a one-point calibration just press the key
Note: If you are working with manual temperature compensation (MTC), update the value before
calibrating the instrument.
• Performing pH measurement
•
In measure mode, press the key
•
Connect the electrode to the pH / ORP BNC of the instrument (green).
•
If the user does not use an electrode with a built-in temperature probe or an external probe NTC 30KΩ,
it is recommended to manually update the temperature value (MTC).
•
Remove the electrode from its tube, rinse with distilled water and dab gently with paper towel.
•
Check the presence and eliminate any air bubbles in the membrane bulb by stirring vertically (as for
the clinical thermometer). If present, open the side cap.
•
Dip the electrode in the sample, while keeping it slightly stirred.
•
The scrolling on the display of four red bands
•
Consider the measurement truthful only when the stability icon appears
UM Serie 50VioLab EN rev.2 26.07.2021
.
appears again, press the key
appears.
and move to the pH parameter indicated by the icon
18
appears and the value flashes,
.
to confirm the first point; the actual measured
appears and the actual value
.
to confirm the second point; the actual
after finishing the first point.
means that the measurement is not stable yet.
to return to the
.
..
.
.
EN