User Manual Owner's manual

Rockwell Automation Publication PROCES-UM002A-EN-P - July 2014 121
Cerabar S Pressure Transmitter Appendix H
Measured Variables
Absolute pressure and gauge pressure, from which level (level, volume or mass) is
derived.
Signals from Instrument to Control System
h=
p
ρ g
h
Item Description
h Height (level)
p Pressure
r Density of the medium
g Gravitation constant
Signal Details
Output Signal 4...20mA with superimposed digital communication protocol HART 5.0, 2-wire
Options:
• Maximum alarm: can be set from 21...23 mA
• Keep measured value: last measured value is kept
• Minimum alarm: 3.6 mA