Emerson Process Management 8732 manual Optimizing Tunable Empty Pipe, Empty Pipe Trigger Level

Reference Manual

00809-0100-4663, Rev BA January 2010

Rosemount 8732

Empty Pipe Value

375

AMS Tab

Transducer Block, Diagnostics, Basic Diagnostics, Empty Pipe Limits, EP Value Diagnostics

Reads the current Empty Pipe Value. This is a read-only value. This number is a unitless number and is calculated based on multiple installation and process variables such as sensor type, line size, process fluid properties, and wiring. If the Empty Pipe Value exceeds the Empty Pipe Trigger Level for a specified number of updates, then the Empty Pipe diagnostic alert will activate.

Empty Pipe Trigger Level

375

AMS Tab

Transducer Block, Diagnostics, Basic Diagnostics, Empty Pipe Limits, EP Trigger

Level

Diagnostics

Optimizing Tunable Empty Pipe

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 Counts

375Transducer Block, Diagnostics, Basic Diagnostics, Empty Pipe Limits, EP Counts AMS Tab Diagnostics

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

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