Table of Contents
Advertisement
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
10-04-2010
17:15
The instrument displays the value obtained by the electrode all
pH MEASURE
the time . These data can be stored or printed with program-
New CAL in 12 h
mable interval of time . To select this type of measurement see
Channel 1
"Re-programming pH measurement" .
From the standard measuring mode (by stability), pressing twice
...by stability
the key
the measured value is shown on the display at any
...
moment but without option for data acquisition .
Start measurement
Channel 1
Measurement by time
MEASURING
by stability
The measurement is shown on the display after programmed
pH * * * *
25˚C
time . To select this measuring mode see "Re-programming pH
Sample 1
00:01
measurement" .
or
Manual samples coding
MEASURING
by stability
+
With sensION
it is possible to introduce a specific
™
MM340
pH * * * *
23˚C
code (maximum 15 characters) per each sample using an external
Stirring
30%
Sample 1
00:10
PC key board or bar code . See "System", page 17 .
or
MEASURING
by stability
10-04-2010
17:15
pH * * * *
23˚C
pH MEASURE
New CAL in 12 h
Stirring 25%
Sample 1
00:11
Channel 1
MEASURING
by stability
...by stability
...
pH * * * *
25˚C
Start measurement
Channel 1
Sample 1
00:01
or
MEASURING
by stability
...by stability
Sample identification
pH * * * *
23˚C
_
Sample 1
00:10
STABLE MEASUREMENT C1
MEASURING
by stability
pH 6.28
23˚C
pH * * * *
25˚C
Sample 1
00:25
Next sample
Sample 1
00:01
etc.
10
+
™
MM340
MEASURING (
)
continuous
pH 5.26
25˚C
Sample 1
00:01
or
MEASURING (
)
continuous
pH 5.27
23˚C
Stirring
30%
Sample 1
00:25
or
MEASURING (
)
continuous
pH 5.27
23˚C
Stirring 25%
Sample 1
00:25
MEASURING (
)
continuous
pH 5.27
25˚C
Sample 1
00:05
or
MEASURING (
)
continuous
Manual coding: introduce
pH 5.27
23˚C
the code for the sample. A
PC keyboard is required.
Sample 1
00:25
HOLD
C1
MEASURING (
)
continuous
pH 5.27
25˚C
pH 5.26
25˚C
Sample 1
00:28
Next sample
Sample 1
00:01
etc.
Manual introduction of the temperature
10-04-2010
17:15
.
pH MEASURE
New CAL in 12 h
Channel 1
...by stability
...
Start measurement
Channel 1
MEASURING
by stability
pH * * * *
Sample 1
To vary stirring speed
or
MEASURING
by stability
pH * * * *
Stirring
30%
Sample 1
or
MEASURING
by stability
pH * * * *
Stirring 25%
Sample 1
MEASURING
by stability
pH * * * *
Sample 1
or
MEASURING
by stability
pH * * * *
Sample 1
STABLE MEASUREMENT C1
pH 6.28
Sample 1
Next sample
Press ESC to quit measurement
With connected temperature probe.
MEASURING
by stability
pH * * *
Sample 1
or
MEASURING
by stability
pH * * *
Stirring 25%
Sample 1
STABLE MEASUREMENT C1
pH 6.28
Sample 1
00:25
Next sample
Press to re-program meas-
urement, see page 9.
Pressing twice, measure-
ment in continuous.
MEASURING (
)
continuous
pH 5.26
25˚C
25˚C
00:01
Sample 1
00:01
or
MEASURING (
)
continuous
pH 5.27
23˚C
23˚C
Stirring
30%
00:10
Sample 1
00:25
or
MEASURING (
)
continuous
pH 5.27
23˚C
23˚C
Stirring 25%
00:11
Sample 1
00:25
To modify ºC
MEASURING (
)
continuous
pH 5.27
25˚C
25˚C
00:01
Sample 1
00:05
or
MEASURING (
)
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
Resolution 0.1 ˚C
22.8˚C
00:10
Stirring varies.
22.8˚C
00:11
22.8˚C
Advertisement
Table of Contents
