HACH LANGE sensION + PH31, Manual

Page: 14 / 72

or or
or or
pH * * * *
25 ˚ C
Sample 1 00:01
...
Start measurement
...by stability
MEASURING
by stability
pH * * * *
25 ˚ C
Sample 1 00:01
MEASURING
by stability
pH * * * *
23 ˚ C
Sample 1 00:10
MEASURING
by stability
pH 5.26
25 ˚ C
Sample 1 00:01
MEASURING (
continuous
)
pH 5.27
25 ˚ C
Sample 1 00:05
MEASURING (
continuous
)
pH 5.27
23 ˚ C
Sample 1 00:25
MEASURING (
continuous
)
pH * * * *
23 ˚ C
Stirring 30%
Sample 1 00:10
MEASURING
by stability
pH 5.27
23 ˚ C
Stirring 30%
Sample 1 00:25
MEASURING (
continuous
)
pH * * * *
23 ˚ C
Stirring 25%
Sample 1 00:11
MEASURING
by stability
pH 6.28
23 ˚ C
Sample 1 00:25
Next sample
STABLE MEASUREMENT C1
pH 5.27
23 ˚ C
Stirring 25%
Sample 1 00:25
MEASURING (
continuous
)
pH 5.27
25 ˚ C
Sample 1 00:28
Next sample
HOLD C1
10-04-2010 17:15
pH MEASURE
New calibration
in 1 day
or
pH * * *
22.8 ˚ C
Sample 1 00:10
MEASURING
by stability
pH * * *
22.8 ˚ C
Stirring 25%
Sample 1 00:11
MEASURING
by stability
pH 6.28
22.8 ˚ C
Sample 1 00:25
Next sample
STABLE MEASUREMENT C1
Sample identification
_
...by stability
pH * * * *
25 ˚ C
Sample 1 00:01
...
Start measurement
...by stability
MEASURING
by stability
pH 5.26
25 ˚ C
Sample 1 00:01
MEASURING (
continuous
)
10-04-2010 17:15
pH MEASURE
New calibration
in 1 day
4. Operation
4.7. pH measurements
Measurement by stability
This is the default measuring mode for the
sensION
™
+
PH 31
.
Meanwhile the reading is in evolution, it appears on the display
momentaneously to orient the user. When the electrode signal
remains invariable during a certain period of time, the reading is
fixed on the display, the reading is stable.
Criterion of “rapid” stability: 0.02 pH (1 mV) in 6 seconds.
Criterion of “standard” stability: 0.01 pH (0.5 mV) in 6 s.
Criterion of “strict” stability: 0.002 pH (0.1 mV) in 6 seconds.
If in a certain time the reading is not stable, the instrument auto-
matically passes to continuous measurement (the measured
value is displayed all the time).
To select another stability criterion or to change measuring
parameters see “Measure re-programming”, page 11.
Magnetic stirrer: the instrument controls automatically the
start/stop of the stirrer.
Continuous measurement
The instrument displays the value obtained by the electrode all
the time. These data can be stored or printed with program-
mable interval of time. To select this type of measurement see
“Re-programming pH measurement”.
From the standard measuring mode (by stability), pressing twice
the key
the measured value is shown on the display at any
moment but without option for data acquisition.
Measurement by time
The measurement is shown on the display after programmed
time. To select this measuring mode see “Re-programming pH
measurement”.
Manual samples coding
With
sensION
™
+
PH 31
it is possible to introduce a specific
code (maximum 15 characters) per each sample using an external
PC key board or bar code. See “System”, page 16.
10
Pressing twice, measure-
ment in continuous.
With connected temperature probe.
Manual introduction of the temperature
Press ESC to quit measurement
Stirring varies.
etc. etc.
Manual coding: introduce
the code for the sample. A
PC keyboard is required.
Resolution 0.1 ˚C
To vary stirring speed
To modify Temp
Press to re-program meas-
urement, see page 9.
PH31 HACH_LANGE 0710.indd ANG:10 PH31 HACH_LANGE 0710.indd ANG:10 8/7/10 16:45:02 8/7/10 16:45:02