YSI pHotoFlex pH Handheld Colorimeter User Manual
Page 54
Operation
pHotoFlex
®
pH
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02/2013
Calibration points
Calibration can be performed using one, two or three buffer solutions in
any order (single-point-, two-point or three-point calibration). The meter
determines the following values and calculates the calibration line as
follows:
You can display the slope in the unit, mV/pH or % (see section 4.6.4).
AutoRead
The calibration procedure automatically activates the AutoRead func-
tion.
The current AutoRead measurement can be terminated at any time
(accepting the current value).
Calibration record
When finishing a calibration, the new calibration values are displayed
as an informative message (
i
symbol) first. Then you can decide
whether you want to take over these values of the new calibration or
whether you want to continue measuring with the old calibration data.
After accepting the new calibration values the calibration record is dis-
played.
Displaying and down-
loading calibration data
to interface
You can view the data of the last calibration on the display. Subse-
quently, you can download the displayed calibration data to the inter-
face, e. g. to a PC, with the
The calibration record of the last calibration can be found under the
Configuration / pH & ORP / Calibration / Calibration record menu item.
Determined val-
ues
Displayed calibration data
1-point
Asy
Asymmetry = Asy
Slope = Nernst slope
(-59.16 mV/pH at 25 °C)
2-point
Asy
Slp.
Asymmetry = Asy
Slope = Slp.
3-point
Asy
Slp.
Asymmetry = Asy
Slope = Slp.
The calibration line is calculated
by linear regression.