30
Reference Manual
00809-0200-4728, Rev SA
Configuration
July 2018
Configuration
Field Communicator
The following steps indicate how to turn the intermittent sensor detect (or transient filter) feature ON or
OFF. When the transmitter is connected to a Field Communicator, use the Fast Key sequence and choose
ON (normal setting) or OFF.
From the HOME screen, enter the Fast Key sequence.
The threshold value can be changed from the default value of 0.2 percent. Turning the Intermittent
Sensor Detect feature OFF or leaving it ON and increasing the threshold value above the default does not
affect the time needed for the transmitter to output the correct alarm signal after detecting a true open
sensor condition. However, the transmitter may briefly output a false temperature reading for up to one
update in either direction up to the threshold value (100% of sensor limits if Intermittent Sensor Detect is
OFF). Unless a rapid response rate is necessary, the suggested setting is ON with 0.2% threshold.
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 Transient Filter
Threshold, enter the desired percent.
4. Select Apply when complete.
2.10.4 Open sensor hold off
The open sensor hold off option, at the normal setting, enables the 644 to be more robust under heavy
EMI conditions. This is accomplished by the software having the transmitter perform additional
verification of the open sensor status prior to activating the transmitter alarm. If the additional
verification shows that the open sensor condition is not valid, the transmitter will not go into alarm.
For users of the Rosemount 644 Transmitter that desire a more vigorous open sensor detection, the
open sensor hold off option can be changed to a fast setting where the transmitter will report an open
sensor condition without additional verification of whether or not the open condition is valid.
Note
In high noise environments, normal mode is recommended.
Field Communicator
From the HOME screen, enter the Fast Key sequence.
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 Open Sensor Hold Off. Change the Mode to either
Normal or Fast.
4. Select Apply when complete.
Device Dashboard Fast Keys
2, 2, 7, 4, 2
Device Dashboard Fast Keys
2, 2, 7, 3
To Next Page
Loading...
Need help?
General
