You must enter Two-Phase Flow Low Limit in g/cm³, even if you configured another unit for density
measurement.
• Default: 0 g/cm³
• Range: 0 g/cm³ to the sensor limit
2. Set Two-Phase Flow High Limit to the highest density value that is considered normal in your process.
Values above this will cause the transmitter to post a Process Aberration alert.
Tip
To reduce the occurrence of two-phase flow alerts that are not significant to your process, set Two-
Phase Flow High Limit slightly above your expected highest process density. For most applications,
leaving the Two-Phase Flow High Limit at 5.0 g/cc will suffice.
You must enter Two-Phase Flow High Limit in g/cm³, even if you configured another unit for density
measurement.
• Default: 5 g/cm³
• Range: 5 g/cm³ to the sensor limit
3. Set Two-Phase Flow Timeout to the number of seconds that the transmitter will wait for a two-phase
flow condition to clear before posting the alert.
• Default: 0 seconds, meaning that the alert will be posted immediately
• Range: 0 to 60 seconds
6.2.2 Detect two-phase flow using sensor diagnostics
Display
Menu → Configuration → Inputs/Outputs → Channel B → I/O Settings → Source
ProLink III Device Tools → Configuration → I/O → Channels → Channel B → mA Output
Field communicator Device Settings → Inputs/Outputs → Mapping/Source → Output Source → mAO x Source
The transmitter always monitors sensor diagnostics and applies a two-phase flow algorithm. You can assign
an mA Output to report the results of this calculation: single-phase flow, moderate two-phase flow, or severe
two-phase flow. Severe two-phase flow can cause the meter to stop functioning.
Prerequisites
Channel B must be configured as mA Output.
Procedure
Set mA Output Source to Two-Phase Flow Detection.
The signal from the mA Output indicates the current state of the process:
• 12 mA: Single-phase flow
• 16 mA: Moderate two-phase flow
• 20 mA: Severe two-phase flow
6.3 Configure Flow Rate Switch
Display
Menu → Configuration → Alert Setup → Enhanced Events → Flow Rate Switch
ProLink III Device Tools → Configuration → I/O → Outputs → Discrete Output → Source → Flow Switch
Indication
Configure advanced options for process measurement Configuration and Use Manual
May2024 MS-00809-0200-1600
72 Emerson.com
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