Emerson Micro-Motion 2400S, Configuration And Use Manual, Page: 89 / 198

Configuration and Use Manual 81
Optional Configuration
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8.7.2 Checking and reporting event status
There are several ways that event status can be determined:
• If your transmitter has a discrete output, the discrete output can be configured to switch states
according to event status (see Section 6.7).
• Event status can be queried using digital communications:
- ProLink II automatically displays event information on the Informational panel of the
Status
window, and also in the
Output Levels
window.
- The Communicator reports active events in Process Variables > View Status or
Diag/Service > Test/Status
.
8.8 Configuring slug flow limits and duration
Slugs – gas in a liquid process or liquid in a gas process – occasionally appear in some applications.
The presence of slugs can significantly affect the process density reading. The slug flow parameters
can help the transmitter suppress extreme changes in process variables, and can also be used to
identify process conditions that require correction.
Slug flow parameters are as follows:
• Low slug flow limit – the point below which a condition of slug flow will exist. Typically, this
is the lowest density point in your process’s normal density range. Default value is 0.0 g/cm
3
;
range is 0.0–10.0 g/cm
3
.
• High slug flow limit – the point above which a condition of slug flow will exist. Typically, this
is the highest density point in your process’s normal density range. Default value is 5.0 g/cm
3
;
range is 0.0–10.0 g/cm
3
.
• Slug flow duration – the number of seconds the transmitter waits for a slug flow condition
( outside the slug flow limits) to return to normal ( inside the slug flow limits).
Example Define Event 1 to stop all totalizers when the mass flow rate in forward
or backward direction is less than 2 lb/min.
1. Specify lb/min as the mass flow unit. See Section 6.4.1.
2. Configure the Flow Direction parameter for bidirectional flow. See
Section 8.6.
3. Select Event 1.
4. Configure:
• Event Type = Low
• Process Variable (PV) = Mass Flow Rate
• Low Setpoint (A) = 2
5. Assign Start/stop All Totals to discrete event 1
.
See Section 6.8
.