Click on the
Continuous
box, in the lower right corner, to enable or disable continuous charting.
When this box is checked, the chart scrolls continuously after reaching the
10
division, and the oldest
samples are lost off the left of the chart. When
Continuous
is not checked, the chart stops displaying
new results after reaching the
10
division, and all subsequent measurements are lost.
Click the up/down pointers for each measurement variable (
GAS
,
TEMPERATURE
and
PRESSURE
) at the right of the chart to change the scaling of that value on the chart. The display of
each measurement variable may be turned on or off by choosing the appropriate
On
or
Off
switch at
the right of the chart.
If your measurements do not chart properly, try using a higher or lower value scale or time base than
the one displayed. Adjust these scale factors
before
starting the monitoring operation. A running
display of latest sample
Gas
,
Temperature
and
Pressure
is also shown in the bottom-right corner of
the chart.
Use the buttons at the bottom of the chart to control real-time monitoring. Choose
Go
to clear the
chart and start real-time monitoring display,
Stop
to stop real-time monitoring and
Copy
to copy the
data from the chart as text information to the Windows Clipboard. This information can be pasted
from the clipboard into any Windows application, such as a spreadsheet or word processor. Finally,
choose
Close
to close the Monitoring window.
After use and storage
You can power off the instrument without losing setup or calibration parameters.
If measuring in a liquid sample, run clean warm water through the flow chamber after each series of
measurements to prevent passages from clogging, and to keep the membrane clean.
The sensor must be continuously purged to prevent any damage to the thermal conductivity sensing
element. The instrument handles this automatically, even if switched off during short periods (for
example overnight), provided it has a power supply (fully charged batteries or an external power
supply).
If you expect not to use your sensor for several days, flush all sample liquid out of the flow chamber,
remove it and dry with a soft tissue. Dry the sensor head surface with a clean soft tissue to ensure no
liquid is on the membrane or protection cap. Once dry, replace the sensor’s storage cap to protect it
from any accidental damage. Store with a silica bag to prevent any humidity build-up.
Options setup
The Hach 3658 program is an integral part of the CO
2
analyzer. Running under Microsoft Windows
®
,
it permits you to list and analyze up to 500 stored measurement values. The program also includes a
special monitoring feature, which lets your computer act as a chart recorder, and enables a hardware
test to ensure that the system is in good working order.
Main menu basics
When you start the program, it displays the
Main Menu
, which automatically maximizes on
opening and appears as follows:
•
File
serves typical Windows file management needs. Hach 3658 data files can be opened, saved
under a different name, closed, or printed. You can also exit the program.
• The
Logger
menu lets you download measurement values from the instrument, make
modifications to the sample list that can be used to identify sampling point locations, or clear the
instrument's stored values.
•
Export
places your information into the Windows Clipboard, so that it can be pasted directly into
other Windows programs. This is especially useful when working with spreadsheet or word
processing programs.
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