Emerson Rosemount 8750W, Reference Manual

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117
Reference Manual
00809-0300-4750, Rev CA
Advanced Diagnostics Configuration
March 2016
Advanced Diagnostics Configuration
Empty pipe (EP) counts
Limits: 2 to 50
Empty pipe counts is the number of consecutive updates that the transmitter must receive
where the empty pipe value exceeds the empty pipe trigger level before the empty pipe
diagnostic alert activates. The default setting from the factory is 5.
6.3.2 Optimizing tunable empty pipe
The tunable empty pipe diagnostic is set at the factory to properly diagnose most
applications. If this diagnostic activates, the following procedure can be followed to
optimize the empty pipe diagnostic for the application.
Example
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
6.4 Electronics temperature
The Rosemount 8750W continuously monitors the temperature of the internal electronics.
If the measured
electronics temperature exceeds the operating limits of –40 to 140 °F (–40 to
60 °C) the transmitter will go into alarm and generate an alert.
LOI menu path
Field Mount: Diagnostics, Basic Diagnostics, Empty Pipe, EP Counts
Wall Mount: AUX. FUNCTION
Traditional Fast Keys
1, 2, 2, 4, 3
Device dashboard
2, 2, 5, 3, 3