HACH LANGE ORBISPHERE 3654, User Manual, Page: 27 / 58

25
Operating Instructions
Click the
TIMEBASE
up/down pointers to change the time scale of the divisions of the chart.
Each division mark along the baseline (1, 2, ...10) can be made to represent from 30 seconds to
2½ hours, providing from 5 minutes to 25 hours of continuously displayed samples. The chart
updating rate is determined by the time scale selected, as shown in
Table 3 below.
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. See
Table 3 above for the maximum number of samples that can be copied for each
chart time scale.
Finally, choose
Close
to close the Monitoring window.
4.6 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, if it is wet, 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) and a fully loaded purge gas cylinder.
If you expect not to use your sensor for several days, flush all sample liquid out of the flow
chamber, remove the flow chamber and dry it 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.
Table 3 Chart updating rate
Timebase Updating Rate* Maximum Samples (10 divisions)
30 Seconds/Division 5 Seconds/Sample 60
1 Minute/Division 5 Seconds/Sample 120
10 Minutes/Division 5 Seconds/Sample 1,200
30 Minutes/Division 9 Seconds/Sample 2,000
1 Hour/Division 18 Seconds/Sample 2,000
2.5 Hours/Division 45 Seconds/Sample 2,000
*This chart's updating rate is independent from the acquisition rate (see
Automatic data acquisition - setting sampling intervals on page 31 ).