82 Micro Motion
®
Model 2400S Transmitters with Analog Outputs
Optional Configuration
If the transmitter detects slug flow:
• A slug flow alarm is posted immediately.
• During the slug duration period, the transmitter holds the mass flow rate at the last measured
pre-slug value, independent of the mass flow rate measured by the sensor. All outputs that
report mass flow rate and all internal calculations that include mass flow rate will use this
value.
• If slugs are still present after the slug duration period expires, the transmitter forces the mass
flow rate to 0, independent of the mass flow rate measured by the sensor. All outputs that
report mass flow rate and all internal calculations that include mass flow rate will use 0.
• When process density returns to a value within the slug flow limits, the slug flow alarm is
cleared and the mass flow rate reverts to the actual measured value.
To configure slug flow parameters:
• Using ProLink II, see Figure C-2.
• Using the Communicator, see Figure C-7.
Note: This functionality is not available via the display menus.
Note: The slug flow limits must be entered in g/cm
3
, even if another unit has been configured for
density. Slug flow duration is entered in seconds.
Note: Raising the low slug flow limit or lowering the high slug flow limit will increase the possibility
of slug flow conditions. Conversely, lowering the low slug flow limit or raising the high slug flow limit
will decrease the possibility of slug flow conditions.
Note: If slug flow duration is set to 0, the mass flow rate will be forced to 0 as soon as slug flow is
detected.
8.9 Configuring fault handling
There are three ways that the Model 2400S transmitter can report faults:
• By setting outputs to their configured fault levels (see Sections 6.5.5, 6.6.5, and 6.7.3)
• By configuring a discrete output to indicate fault status
• By posting an alarm to the active alarm log
Status alarm severity controls which of these methods is used. For some faults only, fault timeout
controls when the fault is reported.
8.9.1 Status alarm severity
Status alarms are classified into three levels of severity. The severity level controls transmitter
behavior when the alarm condition occurs. See Table 8-6.
Table 8-6 Alarm severity levels
Severity level Transmitter action
Fault If this condition occurs, an alarm will be generated and all outputs go to their configured
fault levels. See Chapter 6.
Informational If this condition occurs, an alarm will be generated but output levels are not affected.
Ignore If this condition occurs, no alarm will be generated (no entry is added to the active alarm
log) and output levels are not affected.
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