34
Reference Manual
00809-0100-4728, Rev MB
Configuration
July 2016
Configuration
Using a 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
.
The threshold value can be changed from the default value of 0.2%. 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.
Using AMS Device Manager
1. Right click on the device and select
Configure
.
2. In the left navigation pane choose
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. Click
Apply
when complete.
2.10.4
Open Sensor Holdoff
The
Open Sensor Holdoff
option, at the normal setting, enables the Rosemount 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 that desire a more vigorous open sensor detection, the Open Sensor
Holdoff 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.
Using a Field Communicator
Using AMS Device Manager
1. Right click on the device and select
Configure
.
2. In the left navigation pane choose
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. Click
Apply
when complete.
From the
HOME
screen, enter the Fast Key sequence
Device Dashboard Fast Keys
2, 2, 7, 4, 2
From the
HOME
screen, enter the Fast Key sequence
Device Dashboard Fast Keys
2, 2, 7, 3
Summary of Contents for Rosemount 644 HART
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Page 16: ...6 Reference Manual 00809 0100 4728 Rev MB Introduction July 2016 Introduction ...
Page 86: ...76 Reference Manual 00809 0100 4728 Rev MB Troubleshooting July 2016 Troubleshooting ...
Page 138: ...128 Reference Manual 00809 0100 4728 Rev MB Index July 2016 Index ...
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