36
Reference Manual
00809-0200-4728, Rev RA
Section 2: Configuration
April 2015
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 644 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.
Configure open sensor hold off with a Field Communicator
From the
HOME
screen, enter the Fast Key sequence
.
Configure open sensor hold off with 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.
2.11
Diagnostics and service
2.11.1
Performing a loop test
The analog loop test verifies the output of the transmitter, the integrity of the loop, and the
operations of any recorders or similar devices installed in the loop. To initiate a loop test, follow
the steps below.
The host system may provide a current measurement for the 4-20 mA HART output. If not,
connect a reference meter to the transmitter by either connecting the meter to the test
terminals on the terminal block, or shunting transmitter power through the meter at some
point in the loop.
Performing a loop test with a Field Communicator
From the
HOME
screen, enter the Fast Key sequence.
Device Dashboard Fast Keys
2, 2, 7, 3
Device Dashboard Fast Keys
3, 5, 1
Summary of Contents for Rosemount 644
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