Xylem VARIO WATERPROOF PH METER - Manual (Page 19)

VARIO pH Operation
19 ba75373e04 07/2006
4.2 Switching on the meter
Note
The meter has an energy saving feature to avoid unnecessary battery
depletion. The energy saving feature switches the meter off if no entry is
made during the specified switch-off interval (see section 4.7).
4.3 Measuring
4.3.1 General information
Depth of
immersion of a
short pH electrode
The flat electrode of the short pH electrode enables pH measurements on
surfaces, as for example skin, paper, etc.
For measurement in a measuring solution we recommend a minimum
immersion depth of approx. 2 mm for optimum and reproducible
measurement results.
The maximum immersion depth of the short pH electrode in a measuring
solution is up to below the coupling ring. If it is submersed deeper, liquid can
penetrate the meter and damage it.
Depth of
immersion of
electrodes
Instructions on the depth of immersion of electrodes that are run on the
VARIO pH via the adapter can be found in the documentation of your
electrode.
AutoRead
(drift control)
The AutoRead function (drift control) checks the stability of the measurement
signal. The stability has a considerable impact on the reproducibility of
measured values. The AutoRead function is automatically active. The unit of
the measured value flashes on the display as long as the stability criterion is
not met. A stable measured value is achieved when the unit of the measured
parameter no longer flashes.
With identical measurement conditions, the following criterion is valid for the
AutoRead function:
1 Switch on the meter with < ( >.
After a short display test, a measured value is displayed.
If no short pH electrode or adapter is connected, the error message,
Err4 appears on the display (see chapter 6 W
HAT TO DO IF ...).
Measured parameter Reproducibility Response time
pH better than 0.02 > 30 seconds