HACH LANGE ORBISPHERE 3654, Руководство пользователя, Страница: 33 / 58

31
Options Setup
5.4.3 Membrane selection
You may find it necessary to use a different type of membrane for different applications.
Naturally, with any membrane change, you will need to re-calibrate (see also
Sensor calibration
on page 33 ).
You should also consider the changes in required flow rates and response times, which are
listed in
Sensor specifications on page 10 .
To re-configure the analyzer, choose
Configuration
,
Membrane
to bring up the box which
reveals the membrane models available.
Note:
Only those membranes applicable to your system can be selected. All other membranes are grayed
out.
5.4.4 Automatic data acquisition - setting sampling intervals
The analyzer can perform as a standalone data acquisition device, automatically recording gas
measurements with the date and time, and storing up to 500 of these values. Choosing the
WIN3654 program's
Configuration
,
Sampling Rate
menu lets you select time intervals
(acquisition rate) for this storage capability.
Note:
The Acquisition rate set via this menu is independent from the monitoring chart updating rate
described in Monitoring measurements in real-time on page 24 . The sampling rate menu applies only to
automatic data acquisition, while the chart updating rate is used only for displaying real-time results via the
monitoring chart.
5.4.5 Calibration medium
You can use the
Configuration
,
Calibration medium
command to select how the sensor is to
be calibrated.
Note:
You can create a solution having a known H
2
or N
2
concentration by dissolving H
2
or N
2
in water at a
measured temperature and pressure. Hach Lange can provide equipment for generating such a solution.
Alternatively, you can analyze a carbonated beverage independently by other acceptable means.
Membrane 29561A is available for any gas measurement.
Membranes 2935A and 2952A are available for H
2
measurement only.
Choose
OK
when the desired membrane is selected.
Use the slide bar to view and select a sampling rate, from 15
seconds to 1 hour. The selected rate is shown in the
Acquisition rate
window.
Click
OK
to save this rate. Once your choice is made, the
analyzer can be used independently of the WIN3654 program
for data acquisition, as described in
Automatic data
acquisition on page 20 .
Choose either in pure H
2
or N
2
gas at
atmospheric pressure or in a liquid or
gaseous solution at a known concentration of
gas.
Choose
OK
when the desired medium is
selected.