Xylem VARIO WATERPROOF PH METER - Manual (Page 25)

VARIO pH Operation
25 ba75373e04 07/2006
Note
At this point, calibration can be terminated with <
E >. This corresponds to
a single-point calibration. For this, the instrument uses the Nernst slope
(-59.2 mV/pH at 25 °C) and determines the asymmetry of the electrode. The
asymmetry that was determined (ASY) appears on the display. By pressing
<
g > you display the slope of the calibration line (SLO). After a successful
calibration the probe symbol appears in the measured value display.
Two-point
calibration
Note
At this point, calibration can be terminated with <
E >. This corresponds to
a two-point calibration. The asymmetry that was determined (ASY)
appears on the display. By pressing <
g > you display the slope of the
calibration line (SLO). After a successful calibration the probe symbol
appears in the measured value display.
6 Start measurement with < g >.
The unit of the measured value display flashes (AutoRead) as long
as the measured value is not stable.
7 Toggle between the display of the nominal buffer value (pH) and the
electrode voltage (mV) as necessary with <
" > [<pH or mV>].
8 Wait until the measured value is stable.
BUF2 appears on the display.
or
Accept the measured value with <
g >.
BUF2 appears on the display.
9 To continue the calibration with a further buffer, thoroughly rinse the
electrode with deionized water.
10 If necessary, enter the temperature of the second buffer solution
manually.
11 Immerse the electrode in the buffer solution.
12 Start measurement with < g >.
The unit of the measured value display flashes (AutoRead) as long
as the measured value is not stable.
13 Toggle between the display of the nominal buffer value (pH) and the
electrode voltage (mV) as necessary with <
" > [<pH or mV>].
14 Wait until the measured value is stable.
BUF3 appears on the display.
or
Accept the measured value with <
g >.
BUF3 appears on the display.