Installation, Operation, & Maintenance Instructions
IOM J500.35
2021.04
JMT
● +1.440.572.1500
14
Arm HART Device
Standard HART Command to set bit
to be “found” by
MASTER/HOST.
4.2.6 Rerange
NOTE: If Dual Float setup, first screen will be choice between Interface and Media Level. Subsequent
screens are the same.
Enter the value desired for 4mA reading. Note this should be
measured from the dead band set at the factory and marked on
the sensor. Typically, the
Zero
is 000.0 for measuring the full
(default) span.
A transmitter rerange can be done to change the measured level
for which the output will be 4 and 20 mA. It will not affect the
level measurement reported in engineering units selected
(inches, millimeters, etc.), just the current and percentage
output. The units for both will be based on those set in
User
Installation
.
Enter the “span” for “full” value. Typically, this is equal to the
measuring range as ordered.
Reminder: Reranging the 4mA/20mA will change the % and mA
readings on the display, but NOT the engineering units. For example,
on a 96” max measuring range unit, moving the 0” to 24” and the
full/
span from 96” to 84” would have the following effect: from 0” to 24”,
the engineering units would rise as the float does, but the mA output
would be 3.8mA (empty saturation) with a corresponding negative %.
At 24”, the mA output and % would be 4mA and 0%, respectively, and
begin to
rise linearly until 20mA/100% at 84”. Above 84”, the mA output
would rise to full saturation 20.5mA with a corresponding 100+% value.
(Exact negative and 100+% driven by length of span and differ by unit.)
