Xylem PH3210 FIELD PH METER - Manual (Page 37)

pH 3210 Operation
37 ba75793e02 12/2008
Calibration points Calibration can be performed using one to five buffer solutions in any
order (single-point to five-point calibration). The meter determines the
following values and calculates the calibration line as follows:
Note
You can display the slope in the units, mV/pH or % (see page 24).
Stability control The calibration procedure automatically activates the stability control
function. The current measurement with stability control can be
terminated at any time (accepting the current value).
Calibration record The new calibration values are displayed when the calibration is
finished.
Display calibration You can have the data of the last calibration displayed (see page 52).
Calibration evaluation After calibrating, the meter automatically evaluates the calibration. The
zero point and slope are evaluated separately. The worse evaluation of
both is taken into account. The evaluation appears on the display and
in the calibration record.
Determined
values Displayed calibration data
1-point Asy z Zero point = Asy
z Slope = Nernst slope
(-59.16 mV/pH at 25 °C)
2-point Asy
Slp. z Zero point = Asy
z Slope = Slp.
3-point to
5-point Asy
Slp. z Zero point = Asy
z Slope = Slp.
The calibration line is calculated
by linear regression.
Display Calibration
record Zero point
[mV] Slope
[mV/pH]
+++ - 15 ... +15 -60.5 ... -58
++ - 20 ... +20 -58 ... -57