Emerson Rosemount 2240S, Reference Manual

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Reference Manual
00809-0100-2240, Rev DA
Configuration/Operation
October 2017
Configuration/Operation
5.10 Analog Input block
5.10.1 Configure the AI block
A minimum of four parameters are required to configure the AI Block. The parameters are described
below with example configurations shown at the end of this section.
CHANNEL
Select the channel that corresponds to the desired sensor measurement:
Table 5-9. AI Block Channels for the Rosemount 2240S
L_TYPE
The L_TYPE parameter defines the relationship of the transmitter measurement (Housing Temperature,
Auxiliary Device Value, Water Level, Pressure, Average Liquid Temperature, Average Vapor Temperature,
Tank Temperature) to the desired output of the AI Block. The relationship can be direct or indirect root.
Direct
Select direct when the desired output will be the same as the transmitter measurement (Housing
Temperature, Auxiliary Device Value, Water Level, Pressure, Average Liquid Temperature, Average Vapor
Temperature, Tank Temperature).
Indirect
Select indirect when the desired output is a calculated measurement based on the transmitter
measurement (e.g. level value displayed in percentage of full span based on measured product level).
The relationship between the transmitter measurement and the calculated measurement will be linear.
Indirect Square Root
Select indirect square root when the desired output is an inferred measurement based on the
transmitter measurement and the relationship between the sensor measurement and the inferred
measurement is square root.
AI Block Parameter
TB Channel
Value
Process Variable
Internal Temperature 1 CHANNEL_HOUSING_TEMPERATURE
Auxiliary device value 2 CHANNEL_SB_VALUE
Water level 3 CHANNEL_WATER_LEVEL
Pressure 4 CHANNEL_PRESSURE
Average liquid temperature 5 CHANNEL_ TEMP_AVERAGE_LIQUID
Average vapor temperature 6 CHANNEL_ TEMP_AVERAGE_VAPOR
Average Tank Temperature 7 CHANNEL_ TANK_TEMPERATURE