Ph Calibration - ProMinent DULCOMETER Pt 1000 Instrucciones De Servicio

6.4
6.4.1
Calibrating the meter:
Immerse the pH probe into the buffer solution and stir gently.
Press the "CAL" key: the LCD elements "cal" and "pH" are steadily
displayed and element "P1" (i.e. buffer 1) is flashing.
• The buffer value 7.00 pH is indicated on the LCD display.
Press the CAL key repeatedly to move through buffer values 4.00/7.00/
10.00 pH.
Press the keys "UP" or "DOWN" to change the selected buffer value in
0.01 pH steps, if required.
• If the calibration is already in operation when the key is pressed, it will be
started anew; thus the calibrating buffer and its exact value can be
changed after start of the actual calibration.
• Actual calibration starts 2 sec after pressing the last key; the LCD marker
"P1" is displayed steadily.
• After 30 sec. the displayed buffer value flashes if the calibration of buffer 1
is still in operation.
• If the calibration of buffer1 is not valid, an error message is displayed. See
Error messages when calibrating.
• If the calibration of buffer 1 is valid the LCD element "P2" is switched on
and flashes in addition to element "P1".
Select a new buffer using the key CAL to start the calibration of buffer 2.
®
ProMinent

pH calibration

Two point pH calibration
CAUTION
• The pH sensors must be calibrated at regular intervals, i.e.
initially 24 hours after the original calibration and thereafter
each week.
• Always use high quality pH buffer solutions to calibrate the
pH sensors! The "Phenol red method" is too imprecise for
this calibration!
Operation
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