Dwyer ULSS User Manual
Page 15
Rev 5
MN890570
15 of 30
ULSX‐CAL CONFIGURATION (continued)
Step Seven
Loop Fail‐Safe: This feature allows you to select the fail‐safe current
output if the sensor fails to detect a return signal. When the sensor
regains signal, the output current will revert back to the current level
condition.
o
Hold Last Value ‐ The output will remain in the same state as
the last echo detected. Example: If the output was 6.7 mA just
prior to the lost signal, the device will continue to output 6.7
mA. Sensor will indicate the level when signal was regain.
o
Empty ‐ The output will revert to the current value for an
empty condition. When “4 mA at Bottom” is selected, the
sensor will output 4 mA when a fail‐safe condition occurs. If
“20 mA at Bottom” is selected, the sensor will output 20 mA
when a fail‐safe condition occurs.
o
Full ‐ The output will revert to the current value for a full
condition. When “4 mA at Bottom” is selected, the sensor will
output 20 mA when a fail‐safe condition occurs. If “20 mA at
Bottom” is selected, the sensor will output 4 mA when a fail‐
safe condition occurs.
o
Overfill (21 mA) ‐ The output current will go to 21 mA when the
return signal is lost.
o
Overfill (22 mA) ‐ The output current will go to 22 mA when the
return signal is lost.
Output at Empty: This feature allows you to select the orientation of
the 4 to 20 mA output (4 to 20 mA or 20 to 4 mA). Choose which
output setting best fits the application. Typical installations are set
with 4 mA at Bottom. This will not affect the performance of the
sensor other than the output of the Series ULS. ULSX‐CAL’s factory
default is 4 mA at bottom and 20 mA at top. When connecting your
sensor to a display, you must account for your output settings.
o
4 mA at Bottom ‐ The output current will be 4 mA when the
sensor measures an empty tank and 20 mA when the sensor
measures a full tank.
o
20 mA at Bottom ‐ The output current will be 20 mA when the
sensor measures an empty tank and 4 mA when the sensor
measures a full tank.
Note: Right click on any menu that you may have questions on to open the help menu.
Note: To reset, press the Clear Screen button.