Reference Manual
Rosemount 8732
Optimizing Tunable Empty Pipe
Empty Pipe Trigger Level
Limits: 3 to 2000
This value configures the threshold limit that the Empty Pipe Value must exceed before the Empty Pipe diagnostic alert activates. The default setting from the factory is 100.
Empty Pipe Trigger Count
Limits: 5 to 50
This value configures the number of consecutive updates that the Empty Pipe Value must exceed the Empty Pipe Trigger Level before the Empty Pipe diagnostic alert activates. The default setting from the factory is 5.
The Tunable Empty Pipe diagnostic is set at the factory to properly diagnose most applications. If this diagnostic unexpectedly activates, the following procedure can be followed to optimize the Empty Pipe diagnostic for the application.
1.Record the Empty Pipe Value with a full pipe condition.
Example
Full reading = 0.2
2.Record the Empty Pipe Value with an empty pipe condition.
Example
Empty reading = 80.0
3.Set the Empty Pipe Trigger Level to a value between the full and empty readings. For increased sensitivity to empty pipe conditions, set the trigger level to a value closer to the full pipe value.
Example
Set the trigger level to 25.0
4.Set the Empty Pipe Counts to a value corresponding to the desired sensitivity level for the diagnostic. For applications with entrained air or potential air slugs, less sensitivity may be desired.
Example
Set the counts to 10
