Optional Transmitter 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
•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.
Note: Raising the low slug flow limit or lowering the high slug flow limit will increase the possibility that the transmitter will report slug flow.
Note: The slug flow limits must be entered in g/cm3, even if another unit has been configured for density. Slug flow duration is entered in seconds.
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.
6.11Configuring fault handling
There are four ways that the transmitter can report faults:
•By setting the mA output to its configured fault level (see Section 4.5.4 )
•By configuring a discrete output to indicate fault status (see Section 4.6)
•By setting the digital communications fault indicator (see Section 6.12.1)
•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.
6.11.1Changing status alarm severity
Status alarms are classified into three levels of severity. Severity level controls transmitter behavior when the alarm condition occurs. See Table
Table 6-4 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. Output configuration is described in Chapter 4. |
|
|
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. |
|
|
You cannot reclassify a Fault alarm, or change another alarm to a Fault alarm. However, alarms can be reclassified from Informational to Ignore, or vice versa. For example, the default severity level for the A118 – DO1 Fixed alarm is Information, but you can set it to Ignore.
Using the Transmitter
Optional Configuration
Filler Configuration
Using the Filler
Configuration and Use Manual | 47 |
