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Reference Manual
00809-0200-4728, Rev SA
AMS Device Manager
1. Right click on the device and select Configure.
2. In the left navigation pane select Manual Setup.
3. On the Device Tab there will be a group box called Noise Rejection, in the box AC Power Filter select
from the drop down menu.
4. Select Apply when complete.
2.10.2
Resetting the device
Processor Reset function resets the electronics without actually powering down the unit. It does not
return the transmitter to the original factory configuration.
Field Communicator
From the HOME screen, enter the Fast Key sequence.
Device Dashboard Fast Keys
AMS Device Manager
1. Right click on the device and select Service Tools.
2. In the left navigation pane select Maintenance.
3. On the Reset/Restore Tab select the Processor Reset button.
4. Select Apply when complete.
2.10.3
Intermittent sensor detection
The intermittent sensor detection feature (also known as the transient filter) is designed to guard against
erratic process temperature readings caused by intermittent open sensor conditions. An intermittent
sensor condition is an open sensor condition that lasts less than one update. By default, the transmitter is
shipped with the intermittent sensor detection feature switched ON and the threshold value set at 0.2%
of sensor limits. The intermittent sensor detect feature can be switched ON or OFF and the threshold
value can be changed to any value between 0 and 100 percent of the sensor limits with a Field
Communicator.
When the intermittent sensor detection feature is switched ON, the transmitter can eliminate the output
pulse caused by intermittent open sensor conditions. Process temperature changes (T) within the
threshold value will be tracked normally by the transmitter's output. A (T) greater than the threshold
value will activate the intermittent sensor algorithm. True open sensor conditions will cause the
transmitter to go into alarm.
The threshold value of the Rosemount 644 Transmitter should be set at a level that allows the normal
range of process temperature fluctuations; too high and the algorithm will not be able to filter out
intermittent conditions; too low and the algorithm will be activated unnecessarily. The default threshold
value is 0.2 percent of the sensor limits.
When the intermittent sensor detection feature is switched OFF, the transmitter tracks all process
temperature changes, even from an intermittent sensor. (The transmitter in effect behaves as though
the threshold value had been set at 100 percent.) The output delay due to the intermittent sensor
algorithm will be eliminated.
Configuration
3, 4, 6, 1
Configuration
July 2018
29
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