Consort P901 Mode D'emploi page 8

1. Select [MAIN MENU], [pH] by pressing MODE. The display will immediately
show the measured value according to the previous calibration. Should you
want to recalibrate, press CAL.
2. The display shows up to five of the 9 buffers in memory, e.g. [7.00] and [4.00].
Select the proper buffers or enter manu ally a special value and press CAL. The
unused buffers should be switched off.
3. Rinse the electrodes with distilled water and immerse them in the first buffer
solution. Select [CALIBRATE], press CAL and follow the in struc tions on the
screen until the calibration is finished.
4. After rinsing the electrodes with distilled water, immerse them in the samples
and read the display.
5. Rinse the electrodes always with distilled water after use and store them in a
3...4 M KCl solution.
Relative pH measurements (P902, P903):
1. While in the pH range, press Ù. At that moment the instrument stores the
actual value and automatically subtracts it from all next measurements. You
can repeat this as many times as required. [REL] in the display appears.
2. To cancel relative pH readings, press MODE and you will be in the normal
measuring mode again.
Using pH electrodes with an abnormal zero point (P902, P903):
1. Select [E0 = x mV] and press CAL.
2. Enter the zero point (Eo) of the elec tro de and press CAL.
• A blinking decimal point warns you for unstable measurements. Wait to read
the display!
• Stirring the solution during the measurements promotes the homogeneity and
is therefore always recommended.
• Press Ú to change the resolution from 0.1 to 0.001 pH.
1. Select [MAIN MENU], [mV] by pressing MODE. The display will immediately
show the measured value according to the previous calibration. Should you
want to recalibrate, press CAL.
2. Immerse the electrodes in a standard solution of known potential, adjust to
the proper value and press CAL.
Relative mV measurements (P902, P903):
1. While in the mV range, press Ù. At that moment the instrument stores the
actual value and automatically subtracts it from all next measurements. You
can repeat this as many times as required. [REL] in the display appears.
2. To cancel relative mV readings, press MODE and you will be in the normal
measuring mode again.
• A blinking decimal point warns you for unstable measurements. Wait to read
the display!
• Stirring the solution during the measurements promotes the homogeneity and
is therefore always recommended.
• Press Ú to change the resolution from 1 to 0.1 mV (P903).
P901 • P902 • P903 P901 • P902 • P903
pH measurement
mV measurement
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