
User’s Manual Pub. 0300257-01 Rev. A
Appendix D
Engineering
Unit Codes
This table maps engineering unit code numbers to their meaning and abbreviations.
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
32 Degrees Celsius °C
33 Degrees Fahrenheit °F
34 Degrees Rankine °R
35 Kelvin °K
36 millivolts mV
37 ohms ohm
38 hertz hz
39 milliamperes mA
40 gallons usg
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