Emerson Fisher 4320 Instruction Manual page 44

Instruction Manual
D103621X012
Open Time Alerts
Note
Open Time Alerts are not available in snap-acting mode.
Open Stroke Time Alert—indicates that the last open stroke time fell outside the time limits allowed by the
configuration.
Open Stroke (Cal)—indicates the time required to complete open stroke during Auto Calibration.
Last Open Stroke—indicates the time required to complete the most recent stroke from closed to opened position.
Enable 'Open Stroke'
Low Trip Point
High Trip Point
Calibration
WARNING
During calibration the valve will move full stroke. To avoid personal injury and property damage caused by the release of
pressure or process fluid, isolate the valve from the process and equalize pressure on both sides of the valve or bleed off the
process fluid.
Note
You cannot change the valve set point (i.e. open to closed) when the instrument is in snap-acting mode. This is because the
position signal from the monitored equipment is used to change the state of a different valve. Refer to figure 3 on page 3.
Manual calibration of the output is required when in snap-acting mode.
Calibration Date—indicates when the instrument was last calibrated.
Note
The Not Calibrated Alert replaces Calibration Date when it is active.
Sensor Calibration—allows you run a calibration on the instrument. Follow the prompts on the Field Communicator to
run Auto or Manual Calibration.
Note
If it takes longer than 5 minutes to move the valve in each direction during Auto Calibration, Manual Calibration will need to be
performed. A normal auto calibration moves from Open > Closed > Open > Closed, and may take up to 20 minutes.
4320 Position Monitor
October 2012
43