
68
19. Appendices
19.1 Selecting Automatic or Manual Range Switching
The Automatic Range switching function of the
smart
CHEM
-C
is ideal for most applications.
When used in the mode, the
smart
CHEM
-C
will always provide the user with optimum resolution
and accuracy for the measurement being taken.
If readings are being sent to the optional recorder port, it may be better to switch ranges manually.
This will avoid unusual spikes or troughs in the data being output.
19.1.1 Conductivity and TDS modes
To select Manual range switching…
1. Select the Mode menu (
→
→
F3:Mode
).
2. Select
F6:Man R
to change to Manual Range Switching, if the
smart
CHEM
-C
is currently in
Automatic Range Switching mode. The
smart
CHEM
-C
now provides information on how to
manually change ranges up and down when taking measurements. The main display will now
appear with the “
Man. Range
” prompt to remind the user that the unit is in Manual Range
Switching mode. For example…
2.76
mS/cm
Man.
Range
25.0
O
C 31/12/03
12:00:00
3. Press
to switch
UP
one range at a time.
Press
to switch
DOWN
one range at time.
Notes
1. If a range is selected which is too low for the current reading, the message “
Change Range
”
is displayed. Press
to switch
UP
one range at a time until the
smart
CHEM
-C
displays a
reading.
2. If a range is selected which is too high for the k factor of the sensor, the message “
Range
Limit
” is displayed and the
smart
CHEM
-C
returns to the previous range.
To select Automatic range switching…
1. Select the Mode menu (
→
→
F3:Mode
).
2. Select
F6:AutoR
to change to Automatic Range Switching, if the
smart
CHEM
-C
is currently
in Manual Range Switching mode.
3. The main display does not show a prompt to indicate that Automatic range switching has been
selected to avoid cluttering the display for most applications.
19.1.2 Resistivity Mode
Manual range switching is not available in Resistivity Mode.
19.1.3 Ratio Mode
Manual range switching is not available in Ratio Mode.