Emerson Rosemount 644 Reference Manual page 29

Reference Manual
00809-0200-4728
Figure 2-10: Configuring Average Units with LOI
* Available only if option code (S) or (D) is ordered.
** Available only if option codes (S) and (DC) are both ordered, or if option codes (D)
and (DC) are both ordered.
Figure 2-11: Configuring Average Damping with LOI
* Available only if option code (S) or (D) is ordered.
** Available only if option codes (S) and (DC) are both ordered, or if option codes (D)
and (DC) are both ordered.
Note
If Sensor 1 and/or Sensor 2 should fail while PV is configured for average temperature
and Hot Backup
recommended when PV is Sensor Average, that Hot Backup 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 Hot Backup is enabled, while
PV is Sensor Average, three scenarios could result:
—
—
—
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.
Emerson.com/Rosemount
VIEW CONFIG
SENSOR CONFIG
UNITS
RERANGE
LOOP TEST
DISPLAY
EXTENDED MENU
EXIT MENU
VIEW CONFIG
SENSOR CONFIG
UNITS
RERANGE
LOOP TEST
DISPLAY
EXTENDED MENU
EXIT MENU
™
is not enabled, the transmitter will go into alarm. For this reason, it is
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
CHANGE ALL
SENSOR 1 UNITS
SENSOR 2 UNITS*
DIFFRNTL UNITS*
AVERAGE UNITS*
1ST GOOD UNITS**
BACK TO MENU
EXIT MENU
CALIBRAT
DAMPING
VARIABLE MAP
TAG
ALARM SAT VALUES
PASSWORD
....
Configuration
March 2021
DEG C UNITS
DEG F UNITS
DEG R UNITS
KELVIN UNITS
MV UNITS
OHM UNITS
BACK TO MENU
EXIT MENU
PV DAMP
SENSOR 1 DAMP
SENSOR 2 DAMP*
DIFFRNTL DAMP*
AVERAGE DAMP*
1ST GOOD DAMP**
BACK TO MENU
EXIT MENU
29