BACnet Engineering Units enumerations

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The BACnet Engineering Units Enumeration

BACnet Engineering Units are defined by the BACnet protocol specification and are used to describe the physical meaning of numerical values associated with BACnet object properties.

Engineering units are typically applied to properties such as Present Value, allowing a BACnet client or operator workstation to correctly interpret whether a value represents temperature, pressure, flow, energy, electrical current, or another measurable quantity.

In the BACnet specification, engineering units are represented as an enumeration known as BACnetEngineeringUnits. Each enumerated value corresponds to a specific unit type defined by the standard.

The complete list of BACnet Engineering Units is defined by the protocol specification and may be extended as the standard evolves. The table listing these enumerations will be provided below.

Enumeration	Unit	Unit type
166	meters-per-second-per-second	Acceleration
0	square-meters	Area
116	square-centimeters	Area
1	square-feet	Area
115	square-inches	Area
105	currency1	Currency
106	currency2	Currency
107	currency3	Currency
108	currency4	Currency
109	currency5	Currency
110	currency6	Currency
111	currency7	Currency
112	currency8	Currency
113	currency9	Currency
114	currency10	Currency
2	milliamperes	Electrical
3	amperes	Electrical
167	amperes-per-meter	Electrical
168	amperes-per-square-meter	Electrical
169	ampere-square-meters	Electrical
199	decibels	Electrical
200	decibels-millivolt	Electrical
201	decibels-volt	Electrical
170	farads	Electrical
171	henrys	Electrical
4	ohms	Electrical
237	ohm-meter-squared-per-meter	Electrical
172	ohm-meters	Electrical
145	milliohms	Electrical
122	kilohms	Electrical
123	megohms	Electrical
190	microsiemens	Electrical
202	millisiemens	Electrical
173	siemens	Electrical
174	siemens-per-meter	Electrical
175	teslas	Electrical
5	volts	Electrical
124	millivolts	Electrical
6	kilovolts	Electrical
7	megavolts	Electrical
8	volt-amperes	Electrical
9	kilovolt-amperes	Electrical
10	megavolt-amperes	Electrical
11	volt-amperes-reactive	Electrical
12	kilovolt-amperes-reactive	Electrical
13	megavolt-amperes-reactive	Electrical
176	volts-per-degree-kelvin	Electrical
177	volts-per-meter	Electrical
14	degrees-phase	Electrical
15	power-factor	Electrical
178	webers	Electrical
238	ampere-seconds	Energy
239	volt-ampere-hours	Energy
240	kilovolt-ampere-hours	Energy
241	megavolt-ampere-hours	Energy
242	volt-ampere-hours-reactive	Energy
243	kilovolt-ampere-hours-reactive	Energy
244	megavolt-ampere-hours-reactive	Energy
245	volt-square-hours	Energy
246	ampere-square-hours	Energy
16	joules	Energy
17	kilojoules	Energy
125	kilojoules-per-kilogram	Energy
126	megajoules	Energy
18	watt-hours	Energy
19	kilowatt-hours	Energy
146	megawatt-hours	Energy
203	watt-hours-reactive	Energy
204	kilowatt-hours-reactive	Energy
205	megawatt-hours-reactive	Energy
20	btus	Energy
147	kilo-btus	Energy
148	mega-btus	Energy
21	therms	Energy
22	ton-hours	Energy
23	joules-per-kilogram-dry-air	Enthalpy
149	kilojoules-per-kilogram-dry-air	Enthalpy
150	megajoules-per-kilogram-dry-air	Enthalpy
24	btus-per-pound-dry-air	Enthalpy
117	btus-per-pound	Enthalpy
127	joules-per-degree-kelvin	Entropy
151	kilojoules-per-degree-kelvin	Entropy
152	megajoules-per-degree-kelvin	Entropy
128	joules-per-kilogram-degree-kelvin	Entropy
153	newton	Force
25	cycles-per-hour	Frequency
26	cycles-per-minute	Frequency
27	hertz	Frequency
129	kilohertz	Frequency
130	megahertz	Frequency
131	per-hour	Frequency
28	grams-of-water-per-kilogram-dry-air	Humidity
29	percent-relative-humidity	Humidity
194	micrometers	Length
30	millimeters	Length
118	centimeters	Length
193	kilometers	Length
31	meters	Length
32	inches	Length
33	feet	Length
179	candelas	Light
180	candelas-per-square-meter	Light
34	watts-per-square-foot	Light
35	watts-per-square-meter	Light
36	lumens	Light
37	luxes	Light
38	foot-candles	Light
196	milligrams	Mass
195	grams	Mass
39	kilograms	Mass
40	pounds-mass	Mass
41	tons	Mass
154	grams-per-second	Mass Flow
155	grams-per-minute	Mass Flow
42	kilograms-per-second	Mass Flow
43	kilograms-per-minute	Mass Flow
44	kilograms-per-hour	Mass Flow
119	pounds-mass-per-second	Mass Flow
45	pounds-mass-per-minute	Mass Flow
46	pounds-mass-per-hour	Mass Flow
156	tons-per-hour	Mass Flow
132	milliwatts	Power
47	watts	Power
48	kilowatts	Power
49	megawatts	Power
50	btus-per-hour	Power
157	kilo-btus-per-hour	Power
247	joule-per-hours	Power
51	horsepower	Power
52	tons-refrigeration	Power
53	pascals	Pressure
133	hectopascals	Pressure
54	kilopascals	Pressure
134	millibars	Pressure
55	bars	Pressure
56	pounds-force-per-square-inch	Pressure
206	millimeters-of-water	Pressure
57	centimeters-of-water	Pressure
58	inches-of-water	Pressure
59	millimeters-of-mercury	Pressure
60	centimeters-of-mercury	Pressure
61	inches-of-mercury	Pressure
62	degrees-celsius	Temperature
63	degrees-kelvin	Temperature
181	degrees-kelvin-per-hour	Temperature
182	degrees-kelvin-per-minute	Temperature
64	degrees-fahrenheit	Temperature
65	degree-days-celsius	Temperature
66	degree-days-fahrenheit	Temperature
120	delta-degrees-fahrenheit	Temperature
121	delta-degrees-kelvin	Temperature
67	years	Time
68	months	Time
69	weeks	Time
70	days	Time
71	hours	Time
72	minutes	Time
73	seconds	Time
158	hundredths-seconds	Time
159	milliseconds	Time
160	newton-meters	Torque
161	illimeters-per-second	Velocitym
162	millimeters-per-minute	Velocitym
74	meters-per-second	Velocitym
163	meters-per-minute	Velocitym
164	meters-per-hour	Velocitym
75	kilometers-per-hour	Velocitym
76	feet-per-second	Velocitym
77	feet-per-minute	Velocitym
78	miles-per-hour	Velocitym
79	cubic-feet	Volume
80	cubic-meters	Volume
81	imperial-gallons	Volume
197	milliliters	Volume
82	liters	Volume
83	us-gallons	Volume
142	cubic-feet-per-second	Volumetric Flow
84	cubic-feet-per-minute	Volumetric Flow
254	million-standard-cubic-feet-per-minute	Volumetric Flow
191	cubic-feet-per-hour	Volumetric Flow
248	cubic-feet-per-day	Volumetric Flow
47808	standard-cubic-feet-per-day	Volumetric Flow
47809	million-standard-cubic-feet-per-day	Volumetric Flow
47810	thousand-cubic-feet-per-day	Volumetric Flow
47811	thousand-standard-cubic-feet-per-day	Volumetric Flow
47812	pounds-mass-per-day	Volumetric Flow
85	cubic-meters-per-second	Volumetric Flow
165	cubic-meters-per-minute	Volumetric Flow
135	cubic-meters-per-hour	Volumetric Flow
249	cubic-meters-per-day	Volumetric Flow
86	imperial-gallons-per-minute	Volumetric Flow
198	milliliters-per-second	Volumetric Flow
87	liters-per-second	Volumetric Flow
88	liters-per-minute	Volumetric Flow
136	liters-per-hour	Volumetric Flow
89	us-gallons-per-minute	Volumetric Flow
192	us-gallons-per-hour	Volumetric Flow
90	degrees-angular	Other
91	degrees-celsius-per-hour	Other
92	degrees-celsius-per-minute	Other
93	degrees-fahrenheit-per-hour	Other
94	degrees-fahrenheit-per-minute	Other
183	joule-seconds	Other
186	kilograms-per-cubic-meter	Other
137	kilowatt-hours-per-square-meter	Other
138	kilowatt-hours-per-square-foot	Other
250	watt-hours-per-cubic-meter	Other
251	joules-per-cubic-meter	Other
139	megajoules-per-square-meter	Other
140	megajoules-per-square-foot	Other
252	mole-percent	Other
95	no-units	Other
187	newton-seconds	Other
188	newtons-per-meter	Other
96	parts-per-million	Other
97	parts-per-billion	Other
253	pascal-seconds	Other
98	percent	Other
143	percent-obscuration-per-foot	Other
144	percent-obscuration-per-meter	Other
99	percent-per-second	Other
100	per-minute	Other
101	per-second	Other
102	psi-per-degree-fahrenheit	Other
103	radians	Other
184	radians-per-second	Other
104	revolutions-per-minute	Other
185	square-meters-per-newton	Other
189	watts-per-meter-per-degree-kelvin	Other
141	watts-per-square-meter-degree-kelvin	Other
207	per-mille	Other
208	grams-per-gram	Other
209	kilograms-per-kilogram	Other
210	grams-per-kilogram	Other
211	milligrams-per-gram	Other
212	milligrams-per-kilogram	Other
213	grams-per-milliliter	Other
214	grams-per-liter	Other
215	milligrams-per-liter	Other
216	micrograms-per-liter	Other
217	grams-per-cubic-meter	Other
218	milligrams-per-cubic-meter	Other
219	micrograms-per-cubic-meter	Other
220	nanograms-per-cubic-meter	Other
221	grams-per-cubic-centimeter	Other
222	becquerels	Other
223	kilobecquerels	Other
224	megabecquerels	Other
225	gray	Other
226	milligray	Other
227	microgray	Other
228	sieverts	Other
229	millisieverts	Other
230	microsieverts	Other
231	microsieverts-per-hour	Other
47814	millirems	Other
47815	millirems-per-hour	Other
232	decibels-a	Other
233	nephelometric-turbidity-unit	Other
234	pH	Other
235	grams-per-square-meter	Other
236	minutes-per-degree-kelvin	Other

FAQ: BACnet Engineering Units

This FAQ is included to improve AI searchability and to answer common questions related to BACnet Engineering Units and their usage.

What are BACnet Engineering Units?

BACnet Engineering Units are standardized unit definitions used to describe the physical meaning of numeric values in BACnet object properties, such as temperature, pressure, or electrical current.

Where are BACnet Engineering Units defined?

They are defined in the BACnet protocol specification as the BACnetEngineeringUnits enumeration.

Why are Engineering Units important in BACnet?

Engineering units allow BACnet clients and operator interfaces to correctly interpret raw numeric values and display them meaningfully to users.

Which BACnet objects use Engineering Units?

Engineering units are commonly used with analog object types such as Analog Input, Analog Output, and Analog Value objects.

Can BACnet Engineering Units change over time?

Yes. As the BACnet standard evolves, new engineering units may be added through revisions of the specification.