Dostmann pH 7+ Manual Del Usuario página 12

EN
Measurement
Rinse pH electrode in pure water, allow it to dry, and submerge it in tested solution. Stir the solution briefly and allow it
to stay in the tested solution until
solution.
Press to turn on
the meter
Self-diagnosis information
Display Icons
Factory default setting
For factory default setting, please refer to parameter P1.5. Per parameter P1.5, all calibration data is deleted and the
meter restores to the theory value (zero electric potential of pH is 7.00, the slope is 100%). Some functions restore to
the original value (refer to appendix -1). When calibration or measurement fails, please restore the meter to factory
default setting and then perform re-calibration or measurement. Please note once set the factory default, all the data
deleted will not be retrievable.
icon appears on LCD and a stable reading is reached which is pH value of tested
Press key to enter
into the calibration
mode
Contents
Wrong pH buffer solution or the
recognition of calibration solution out of
range
Press key when measuring value is not
stable during calibration.
During calibration, the measuring value is not
stable for ≥3min.
Electrode zero electric potential out of
range (<-60mV or >60mV)
Electrode slope out of range
（<85%or >110%）
pH measuring range out of range （<0.00 pH
or >14.00pH）
When the 1
Submerge the electrode in pH
done, press
7.00 solution, press key
in measurement mode.
when icon appears
When the 2
Submerge the electrode in pH
done, press
4.01 solution, press key
in measurement mode.
when icon appears
After the 3
Submerge the electrode in pH
meter enters into the
measurement mode
10.01 solution, press key
automatically.
when icon appears
1.Check whether pH buffer solution is correct.
2.Check whether the meter connects the
electrode well.
3.Check whether the electrode is damaged.
Press
1.Check whether there are bubbles in glass bulb.
2.Replace with new pH electrode.
1.Check whether there are bubbles in glass bulb.
2.Check whether pH buffer solution is correct.
3.Replace with new pH electrode.
1.Check whether the electrode is suspended.
2.Check whether the meter connects the
electrode well.
3.Check whether the electrode is damaged
12
point calibration is
st
key to return
point calibration is
nd
key to return
point calibration, the
rd
Checking
key when icon appears
Sample
test