Rockwell Automation Publication 1718-UM001A-EN-E - December 2019
47
Appendix
D
Engineering Unit Code Numbers
Code Number Details
This table maps engineering unit code numbers to their meaning and
abbreviations. These codes are used in the process variable range display.
Unit Codes
Description from HART Specification
Abbreviated Units
1
inches of water at 20 °C (68 °F)
inH2O (20 °C or 68 °F)
2
inches of mercury at 0 °C (32 °F)
inHg (0 °C or 32 °F)
3
feet of water at 20 °C (68 °F)
ftH2O (20 °C or 68 °F)
4
millimeters of water at 20 °C (68 °F)
mmH2O (20 °C or 68 °F)
5
millimeters of mercury at 0 °C (32 °FC
mmHg (0 °C or 32 °F)
6
pounds per square inch
psi
7
bars
bar
8
millibars
mbar
9
grams per square centimeter
g/square cm
10
kilograms per square centimeter
kg/square cm
11
pascals
Pa
12
kilopascals
kPa
13
torr
torr
14
atmospheres
atm
15
cubic feet per minute
cubic ft/min
16
gallons per minute
usg/min
17
liters per minute
L/min
18
imperial gallons per minute
impgal/min
19
cubic meter per hour
cubic m/h
20
feet per second
ft/s
21
meters per second
m/s
22
gallons per second
usg/s
23
million gallons per day
million usg/d
24
liters per second
L/s
25
million liters per day
ML/day
26
cubic feet per second
cubic ft/s
27
cubic feet per day
cubic ft/d
28
cubic meters per second
cubic m/s
29
cubic meters per day
cubic m/d
30
imperial gallons per hour
impgal/h
31
imperial gallons per day
impgal/d