Ph Measurements; Continuous Measurement - HACH LANGE sensION+ PH31 Manuel D'utilisateur

4. Operation

4.7. pH measurements

Measurement by stability
This is the default measuring mode for the sensION
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 ™
code (maximum 15 characters) per each sample using an external
PC key board or bar code. See "System", page 16.
10-04-2010 17:15
pH MEASURE
New calibration
in 1 day
...by stability
...
Start measurement
...by stability
Sample identification
_
MEASURING
by stability
pH * * * *
Sample 1 00:01
etc.
10
sensION+ PH31 HACH_LANGE 0710.indd ANG:10 sensION+ PH31 HACH_LANGE 0710.indd ANG:10
All manuals and user guides at all-guides.com
™
it is possible to introduce a specific
PH 31
Manual coding: introduce
the code for the sample. A
PC keyboard is required.
MEASURING ( )
continuous
pH 5.26
25˚C 25˚C
Sample 1 00:01
etc.
Manual introduction of the temperature
10-04-2010
+
.
PH 31
pH MEASURE
New calibration
in 1 day
...by stability
...
Start measurement
MEASURING
pH * * * *
Sample 1
MEASURING
pH * * * *
Stirring 30%
Sample 1
or
MEASURING
pH * * * *
Stirring 25%
Sample 1
MEASURING
pH * * * *
Sample 1
or
MEASURING
pH * * * *
Sample 1
STABLE MEASUREMENT C1
pH 6.28
Sample 1
Next sample
Press ESC to quit measurement
With connected temperature probe.
MEASURING
pH * * *
Sample 1
or
MEASURING
pH * * *
Stirring 25%
Sample 1
STABLE MEASUREMENT C1
pH 6.28
Sample 1
Next sample
17:15
Press to re-program meas-
urement, see page 9.
Pressing twice, measure-
ment in continuous.
MEASURING ( )
by stability continuous
pH 5.26
25˚C 25˚C
00:01 Sample 1 00:01
To vary stirring speed
MEASURING ( )
by stability continuous
pH 5.27
23˚C 23˚C
Stirring 30%
00:10 Sample 1 00:25
or
MEASURING ( )
by stability continuous
pH 5.27
23˚C 23˚C
Stirring 25%
00:11 Sample 1 00:25
To modify Temp
MEASURING ( )
by stability continuous
pH 5.27
25˚C 25˚C
00:01 Sample 1 00:05
or
MEASURING ( )
by stability continuous
pH 5.27
23˚C 23˚C
00:10 Sample 1 00:25
HOLD C1
pH 5.27
25˚C
23˚C
00:25 Sample 1 00:28
Next sample
by stability
Resolution 0.1 ˚C
22.8˚C
00:10
Stirring varies.
by stability
22.8˚C
00:11
22.8˚C
00:25
8/7/10 16:45:02 8/7/10 16:45:02