
44
Reference Manual
00809-0100-4021, Rev GC
Section 3: HART commissioning
April 2014
Field communicator
The 3144P transmitter configured for dual-sensors can output and display the average
temperature of any two inputs. Use the following procedure with Traditional Fast Keys to
configure the transmitter to measure the average temperature:
Configure Sensor 1 and Sensor 2 appropriately. Select
1 Device Setup, 3 Configuration, 2 Sensor
Configuration, 1 Change Type and Conn.
to set the sensor type and number of wires for Sensor 1.
Repeat for Sensor 2.
Note
This procedure configures the average temperature as the primary variable analog signal. If this
is not needed, assign the average temperature to the secondary, tertiary, or quaternary variable.
If using an LCD display, configure it to read the appropriate variables using
Note
If Sensor 1 and/or Sensor 2 should fail while PV is configured for average temperature and the
Hot Backup
™
feature is
not
enabled, the transmitter will go into alarm. For this reason, it is
recommended when PV is Sensor Average, that the Hot Backup feature be enabled when
dual-element sensors are used, or when two temperature measurements are taken from the
same point in the process. If a sensor failure occurs when the Hot Backup feature is enabled,
while PV is Sensor Average, three scenarios could result:
If Sensor 1 fails, the average will only be reading from Sensor 2, the working sensor
If Sensor 2 fails, the average will only be reading from Sensor 1, the working sensor
If both sensors fail simultaneously, the transmitter will go into alarm and the status
available (via HART) states that both Sensor 1 and Sensor 2 have failed
In the first two scenarios, the 4-20 mA signal is not disrupted and the status available to the
control system (via HART) specifies which sensor has failed.
First good configuration
Field communicator
The First Good
device variable is useful for applications where dual-sensors (or a single dual
element sensor) are used in a single process. The first good variable will report the Sensor 1
value, unless Sensor 1 fails. When Sensor 1 fails, the Sensor 2 value will be reported as the first
good variable. Once the first good variable has switched to Sensor 2, it will not revert back to
Sensor 1 until a master reset occurs or “Suspend Non-PV alarms” is disabled. When the PV is
mapped to first good variable and either Sensor 1 or Sensor 2 fails, the analog output will go to
the alarm level, but the digital PV value read through the HART interface will still report the
proper first good sensor value.
If the user does not want the transmitter to go into analog output alarm when the PV is mapped
to first good and Sensor 1 fails, enable “Suspend Non-PV Alarm” mode. This combination
prevents the analog output from going to the alarm level unless BOTH sensors fail.
HART 5 Fast Keys
2, 2, 3, 2
HART 7 Fast Keys
2, 2, 3, 2
Содержание Rosemount
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