Emerson Micro Motion 2700 Configuration And Use Manual page 112

Integrate the meter with the control system
Important
If you assign Flow Switch to the Discrete Output, you should also configure Flow Switch Variable, Flow
Switch Setpoint, and Hysteresis.
Related information
Configure Flow Switch parameters
Display
ProLink III
Field Communicator
Overview
Flow Switch is used to indicate that the flow rate (measured by the configured flow variable)
has moved past the configured setpoint, in either direction. The flow switch is
implemented with a user-configurable hysteresis.
Procedure
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104
Configure an enhanced event
Fault indication with the Discrete Output
OFF-LINE MAINT > OFF-LINE CONFG > IO > CH B > SET DO > CONFIG FL SW
Device Tools > Configuration > I/O > Outputs > Discrete Output
• Configure > Manual Setup > Inputs/Outputs > Discrete Output > Flow Switch Source
• Configure > Manual Setup > Inputs/Outputs > Discrete Output > Flow Switch Set-
point
• Configure > Manual Setup > Inputs/Outputs > Discrete Output > Hysteresis
Set Discrete Output Source to Flow Switch, if you have not already done so.
Set Flow Switch Variable to the flow variable that you want to use to control the flow
switch.
Set Flow Switch Setpoint to the value at which the flow switch will be triggered
(after Hysteresis is applied).
• If the flow rate is below this value, the Discrete Output is ON.
• If the flow rate is above this value, the Discrete Output is OFF.
Set Hysteresis to the percentage of variation above and below the setpoint that will
operate as a deadband.
Hysteresis defines a range around the setpoint within which the flow switch will not
change. The default is 5%. The valid range is 0.1% to 10%.
Example: If Flow Switch Setpoint = 100 g/sec and Hysteresis = 5%, and the first
measured flow rate is above 100 g/sec, the Discrete Output is OFF. It will remain OFF
unless the flow rate drops below 95 g/sec. If this happens, the Discrete Output will
turn ON, and remain ON until the flow rate rises above 105 g/sec. At this point it
turns OFF and will remain OFF until the flow rate drops below 95 g/sec.
Micro Motion Model 2700 Transmitters with Intrinsically Safe Outputs