Configure Flow Rate Switch - Emerson Micro Motion 5700 Configuration And Use Manual

Configure advanced options for process measurement
6.3

Configure Flow Rate Switch

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Overview
Flow Rate Switch is used to indicate that the flow rate has moved past a user-specified
setpoint, in either direction. The flow rate switch is implemented with a user-configurable
hysteresis.
Typically, a discrete output is assigned as the flow rate switch indicator. The discrete
output can be wired to an external device such as a light or a horn.
Prerequisites
A channel must be configured as a discrete output, and the discrete output must be
available for this use.
Procedure
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Menu > Configuration > Alert Setup > Enhanced Events > Flow Rate Switch
Device Tools > Configuration > I/O > Outputs > Discrete Output > Source > Flow Switch
Indication
Configuration > Inputs/Ouputs > Channel C > Discrete Output > Source > Flow Switch
Indication
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
rate 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 rate switch will
not change.
• Default: 5%
• Range: 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 5700 with Ethernet Transmitters