Emerson Micro Motion 3711, Configuration And Use Manual, Page: 71 / 234

Configuration and Use Manual 63
Configuring I/O
V
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lumetr
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Flo
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Measure
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Histor
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, Events, a
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d Alar
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I/
O
Core Interfa
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Figure 7-2 Analog Input – General panel
1. Use the
Analog Inputs
dropdown list to select the AI to configure.
• To configure the built-in pressure sensors, select Line Press or Aux Press .
• To configure an external RTD input using the built-in RTD terminals, select
RTD
.
• To configure the analog inputs on the I/O board, select Aux In 1 or Aux In 2 .
2. Enter the tag to be used to describe this input.
3. Work through the configuration panels in the following order:
• General
• Advanced
• Alarms
Note: To calibrate the AI, see Appendix B.
7.4.1 Filtering
The Model 3711 automatically filters analog input data using the following formula:
where
Entered %
is the value specified for
Filter
on the Advanced panel. The resulting value (the
Filtered Value
) is used for display and further processing.
This calculation is updated once per Scan Period, as configured on the General panel (see
Section 7.4.2).
Many remote devices also have a filtering algorithm. If a filter is applied at both the remote device
and the Model 3711, measurement accuracy may be reduced. To disable the filter in the Model 3711,
enter 0 in the Filter field (see Section 7.4.3).
LastValue Entered%
× ( )
NewValue 100 Entered% –
( ) × [ ]
+