• For gaseous measurements: %/ppm (by volume), % (by volume), kPa/Pa, kPa, bar/mbar, bar,
bar20/mbar20 or bar20
• The
Liquid
medium for dissolved gas concentration measurements: Water, Beer, Cola or Wine
• The
Temperature units
for display: °C or °F
Membrane selection
Membrane 29561A is the only membrane valid for CO
2
gas measurement with this analyzer. To
ensure the analyzer is correctly configured, choose
Configuration
,
Membrane
to bring up the box
which reveals the membrane models available.
Membrane 29561A should be the only membrane available for selection. Select this membrane and
click on
OK
.
Automatic data acquisition - Setting sampling intervals
The instrument 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 Hach
3658 program's
Configuration
,
Sampling Rate
menu lets you select time intervals (acquisition rate)
for this storage capability.
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
instrument can be used independently of the Hach 3658 program for data acquisition. Refer to
Note: The Acquisition rate set via this menu is independent from the monitoring chart updating rate in
on page 13. 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.
Calibration medium
You can use the
Configuration
,
Calibration medium
command to select how the sensor is to be
calibrated.
Choose either in pure CO
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.
Note: Hach Lange recommends the use of its High Precision Calibration Kits for the sensor calibration process.
Wine parameters
Choose
Wine Parameters
from the
Configuration
menu to provide a correction for the alcohol and
sugar content of the wine.
This sets two parameters that influence the solubility of CO
2
in wine. This is the degrees of
Alcohol
in the wine, and the concentration of
Sugar
, in °Brix.
Locking out the instrument’s CAL button
You can use the
Configuration
,
Sensor Calibration Status
menu to prevent an accidental sensor
recalibration from the instrument keyboard.
Choose
Disabled
to lock out the keyboard
CAL
button. To unlock this capability, choose
Enabled
.
Choose
OK
when the desired mode is selected.
Rolling average
Choose
Rolling Average Status
from the
Configuration
menu to enable or disable the averaging of
gas concentration measurements.
To enable averaging on three successive gas measurements, choose
Enable
. Choose
Disable
to
disable rolling average.
Automatic shutdown
Choose
Automatic Shutdown Status
from the
Configuration
menu to activate the Automatic
Shutdown feature.
If you select
Enable
, the instrument switches off automatically after 10 minutes of inactivity, thereby
economizing battery power.
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