Hach Ultra ORBISPHERE 510, Operator'S Manual

Page: 50 / 144

44 of 138 Measurement Menu - Orbisphere 510/511/512 Analyzers
Operator Manual
ORBISPHERE
4.1 Instrument Configuration
4.1.1 TPO or TPA Calculation (portable instrument)
The TPO (Total Package Oxygen) and TPA (Total Package Air) features are available on
the portable instrument for an EC sensor measuring oxygen (refer also to the table in
“Generic Terms and Definitions” on page 132 for an explanation of these two terms).
To initiate these options, the instrument must be configured in “Sample mode” (see
“Continuous or Sample Mode Selection” below) and the TPO or TPA calculation must be
enabled (see “Advanced Configuration” on page 50 ).
The operator also needs to ensure the package is shaken for about 5 minutes before
measuring, and to know the total volume of the package and the total volume of the
contents of the package.
4.1.2 Continuous Mode vs Sample Mode (portable instrument)
Continuous mode is typically used for process measurement, whereas sample mode is
aimed at lab measurements of small volume individual samples such as cans, bottles,
etc. The measurement mode is a parameter defined for the entire instrument, not for
each channel.
"Continuous mode" cycle
• Every 2 sec. measurements are refreshed on the display
• The relays and the analog outputs are updated
• Measurements are continuously stored in memory (volatile and non volatile
memory) according to individual settings
"Sample mode" cycle (portable instruments)
When the user wants to measure a sample:
• He prepares the sample
• He starts the measurement
• When the "stop criteria" is reached (defined in the channel configuration screen -
see details in “Stop Criteria Configuration (portable instrument)” on page 46 ), the
measurement value is frozen and stored according to individual settings. If the
channel is configured for TPO or TPA calculation the user must enter the
respective parameters (see
“TPO and TPA Parameters (portable instrument)” on
page 46 )
• The user can then start a new measurement
4.1.3 Continuous or Sample Mode Selection
In the menu, select “Main/Measurement/Configure
instrument”.
Select “Measurement mode”:
-Continuous mode for on line process
-Sample mode for lab sample analysis (portable
instruments only).
Selection of units for barometric, external pressure
and temperature.