Siemens sitrans PROBE LU - Page 9

A5E32337695 SITRANS Probe LU (HART) – OPERATING INSTRUCTIONS Page 3
SITRANS Probe LU
ppm parts per million
PV Primary Variable measured value
SELV Safety extra low voltage
SV Secondary Variable equivalent value
TVT Time Varying Threshold sensitivity threshold
U
i
Input voltage V
U
o
Output voltage V
URV Upper Range Value value for process full level 20 mA
1
USL Upper Sensor Limit
above which no PV is
anticipated
1.
100% is most commonly set to 20 mA, and 0% to 4 mA: however, the settings
can be reversed.
Short
form
Long Form Description Units