Monitor pH/C-900
User Manual 18-1120-06 Edition AC
8
3
Operation
3.4
Reading pH and conductivity values
The main operating menu shows the conductivity as a percentage of
full scale together with the current temperature in the flow cell, and
the pH value. If the pH value is not stable or is changing, an asterisk
is displayed after the value, e.g. 4.02*. The menu is reached from
any other menu by pressing the ESC-button repeatedly.
If temperature compensation is switched-on, the display will show
CondTc
instead of
Cond
, see menu
Setup conductivity temperature
compensation
in section B.2.1 of Reference information.
By turning the dial one click clockwise, an alternative display of the
conductivity is shown. This display shows the actual conductivity
value in mS/cm together with the percentage value and as a
horizontal bar graph with 10% resolution. If temperature
compensation is switched on,
Tc
is shown in the display.
The display of pH and temperature can be disabled, see menu
Setup
pH display
in section B.2.5 and
Setup temperature display
in section
B.2.7 of Reference information.
3.5
Setting conductivity scale
The monitor measures conductivity over the complete working
range. No range settings are required. However, to obtain a usable
output signal for a recorder, or to view the conductivity as a
percentage of buffer B, it is possible to set a 0 to 100% range. This
can be done with reference to the buffers used or by selecting any
fixed range between 0 µS/cm and 999.9 mS/cm.
To set the scale with reference to the buffers do as follows:
1 Start the flow with the high conductivity buffer. Select main
menu
Set Cond Scale 100%
, press OK.
2 When the conductivity level has stabilized, set the value which
should correspond to
100%
by pressing OK. If required, the value
can be changed with the setting dial.
3 Change to the low conductivity buffer. Select main menu
Set
Cond Scale 0%
, press OK.
4 When the conductivity level has stabilized, set the value which
should correspond to
0%
by pressing OK. If required, the value
can be changed with the setting dial.
The scale can be set without pumping buffer through the cell. Follow
the same procedure, and simply set the the conductivity values
directly at points 2 and 4, ignoring the measured conductivity values
displayed. The difference between the value for
100%
and
0%
value
(span) must be at least 1 mS/cm. The settings remain until they are
changed. Values above 150% are shown as 150%, values below 0%
as 0%.
Cond Temp pH
25.4% 22.9°C 11.50
Tc 4.000mS/cm 22.9°C
–––
25.4%
Set Cond Scale 100%
(50.00mS/cm)
Set Cond Scale 0%
(1.000mS/cm)
or
Bar graph
CondTc Temp pH
25.4% 22.9°C 11.50
18-1120-06_AC.qxd 1999-04-14 14:16 Sida 8 (1,1)
Summary of Contents for AKTA design pH/C-900
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