Honeywell SLG 700 User Manual page 96

Lower Range Value (LRV):
The measured value of the Primary Variable for which the 4-20mA loop current output will
be scaled to 4mA. This value must be within the upper and lower limits for the current
Primary Variable, which will vary depending on the type of the variable (Level, Volume,
etc.). Note that it is possible to have a high Primary Variable value mapped to 4mA if a
reverse relationship is required.
Upper Range Value (URV):
The measured value of the Primary Variable for which the 4-20mA loop current output will
be scaled to 20mA. This value must be within the upper and lower limits for the current
Primary Variable, which will vary depending on the type of the variable (Level, Volume,
etc.). Note that it is possible to have a low Primary Variable value mapped to 20mA if a
reverse relationship is required.
Damping (PV Damping Value):
Allows damping of the analog current output to filter out rapid fluctuations. The range of
the damping value is from 0 to 60 seconds, which represents one time constant (i.e.
response to step input reaches 63% of final steady-state value after the specified time
has elapsed), as per the HART specification. This damping is applied to both the digital
Primary Variable as well as the analog Loop Current.
When accessing the Basic Configuration group and 4-20mA Outputs tab using the handheld
devices based on DDs and PC-based DTM / FDT, outside of the Guided Setup mode, the tab
offers options to adjust the following parameters:
Echo Lost Timeout:
The number of seconds that the transmitter will wait after the reflection from the product
has been lost before setting a critical alarm and entering failsafe (burnout) mode.
Latching Mode:
This parameter allows selecting the behavior of the GWR transmitter in case of a critical
error. If the Latching option is selected, the GWR transmitter will stay in the critical error
state until a user performs a hardware or software reset. If the Non-latching option is
selected, the GWR transmitter will leave the critical error state automatically, after the
circumstances leading to the critical state cease to exist and attempts to re-measure level
over the entire probe length.
Page 88
SLG 700 Series HART Option User's Manual
Revision 5