Section
3-1
3
Level Controller Operation
INTRODUCTION
The Model 3095 Multivariable Level Controller is a multi-variable
differential pressure transmitter and level controller combined into one
instrument. Because external controllers are not needed to operate the
Model 3095 Multivariable Level Controller, installation costs are
significantly reduced, while accuracy, performance, and reliability of
the control loop increases.
Rosemount has designed the Model 3095 Multivariable Level
Controller to provide users with the same benefits of stand-alone
transmitters and external controllers. This section explains the
operation, design, functionality and options of the Level Controller.
LEVEL VARIABLES
AND VALUES
The 3095 Level Controller measures differential pressure (DP) and uses
that measurement to calculate process level. The level calculation is
completed by the sensor microprocessor using the following equation:
The calculation uses values for density, gravity, and transmitter
location compared to the bottom of the vessel, as specified by the
operator.
The operator uses the Model 275 HART communicator or AMS to input
the following variables:
• Units of measure
• Density
• Gravity (if different from default)
• Upper Range Value (tank height)
• Lower Range Value (recommend bottom of tank, or 0)
• Setpoint
• Setpoint limits (recommend below the top of the tank)
The Level Controller assumes a constant density and does not correct
for density changes caused by ambient temperature changes.
Level = (DP
÷
Density
×
Gravity) + Transmitter Height
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