Concept
Units
Numeric objects and some property types in EcoStruxure Building Operation support configurable units of measure. In certain object types, the unit is predefined and cannot be modified. The configured unit applies to the value stored in the server.
Unit Categories
All units belong to a unit category. A unit category represents a physical quantity. Examples include:
Power: W, VA, horsepower, Btu/h
Temperature: °C, °F
Pressure, Length, Flow, etc.
Measurement Systems
EcoStruxure Building Operation supports the following measurement systems:
International System of Units (Metric)
United States Customary Units (US)
Some units are identical across both systems (for example A, V, %, s), while others differ depending on regional usage (for example °C and °F).
As in Microsoft Windows (Auto in WebStation)
Values are displayed according to the Region settings of the operating system running WorkStation or WebStation.
If the server stores a value in °C but the client’s region uses US customary units, the value is shown in °F.
As Configured in Object
The value is displayed using the unit configured in the object. The client’s measurement system does not affect the presentation.
When this option is used, unit conversion exceptions are disabled.
International System of Units (Metric)
Values are displayed in SI units.
United States Customary Units (US)
Values are displayed in US customary units.
The measurement system affects only how values are displayed in WorkStation and WebStation. Stored server values are not changed.
Each unit category defines a default unit for each measurement system. If a value must be displayed using a different measurement system than the one used to store the value, the system uses the category’s default unit for the target measurement system.
The following table provides examples of default units:
|
Description |
DefaultSI |
DefaultUS |
|
Absolute Humidity by Mass |
kg/kg |
lb/lb |
|
Absolute voltage in dB |
dBuV |
dBuV |
|
Voltage realtive to one millivolt in dB |
dBmV |
dBmV |
|
Voltage realtive to one volt in dB |
dBV |
dBV |
|
Acceleration |
m/s 2 |
ft/s 2 |
|
Acidity or basicality of solution |
pH |
pH |
|
Acoustic loudness in dB |
dB(A) |
dB(A) |
|
Alcohol concentration |
ABV |
ABV |
|
Ampere Square Hours |
A 2 h |
A 2 h |
|
Angle |
rad |
deg |
|
Angular momentum |
J.s |
J.s |
|
Area |
m 2 |
in 2 |
|
Brewing color measurement |
EBC |
EBC |
|
Capacitance |
F |
F |
|
Color |
Color.Temperature |
Color.Temperature |
|
Compressibility |
m 2 /N |
m 2 /N |
|
Concentration |
/million |
/million |
|
Concentration of extract |
DegreesPlato |
DegreesPlato |
|
Conductance |
S |
S |
|
Conductivity |
S/m |
S/m |
|
Corrosion Rate |
m/yr |
in/yr |
|
Currency |
currency 1 |
currency 1 |
|
Current |
A |
A |
|
Current Density |
A/m 2 |
A/m 2 |
|
Data transfer rate |
bit/s |
bit/s |
|
Density |
g/m 3 |
lb/in 3 |
|
Diffusivity |
m 2 /s |
ft 2 /s |
|
Dipole Moment |
debye |
coulombmeter |
|
Dynamic Viscosity |
Pas |
Pas |
|
Electric charge |
As |
As |
|
Electric Field Strength |
V/m |
V/m |
|
Energy |
J |
Btu |
|
Energy Apparent |
VAh |
VAh |
|
Energy Density |
J/m 3 |
J/m 3 |
|
Energy Efficiency |
EER |
EER |
|
Energy Reactive |
VArh |
VArh |
|
Enthalpy |
J/kg |
Btu/lb |
|
Enthalpy Dry Air |
J/kg_dry_air |
Btu/lb_dry_air |
|
Entropy |
J/K |
J/K |
|
Flavor measurement |
EBU |
IBU |
|
Flow |
m 3 /s |
ft 3 /min |
|
Flow Rate Mass |
g/s |
lb/s |
|
Force |
N |
lbf |
|
Frequency |
Hz |
Hz |
|
The density of all types types of paper |
g/m 2 |
g/m 2 |
|
Heat Capacity |
J/(g.C) |
Btu/(lb.F) |
|
Heat Degree Days |
Cdays |
Fdays |
|
Heat Degree Hours |
Chours |
Fhours |
|
Heat Degree Minutes |
Cminutes |
Fminutes |
|
Heat Degree Seconds |
Cseconds |
Fseconds |
|
Heat Flux |
W/m 2 |
Btu/(s.ft 2 ) |
|
Heat Transfer Coefficient |
W/(m 2 .K) |
Btu/(s.ft 2 .K) |
|
Humidity |
% Rh |
% Rh |
|
Illuminance |
lux |
lux |
|
Inductance |
H |
H |
|
Length |
m |
ft |
|
Linear Momentum |
N.s |
N.s |
|
Luminance |
cd/m 2 |
cd/m 2 |
|
Luminous efficiency |
lm/W |
lm/W |
|
Luminous Flux |
lm |
lm |
|
Luminous Intensity |
cd |
cd |
|
Magnetic Dipole Moment |
A.m 2 |
A.m 2 |
|
Magnetic Field Strength |
A/m |
A/m |
|
Magnetic Flux |
Wb |
Wb |
|
Magnetic Flux Density |
T |
T |
|
Mass |
g |
lb |
|
Mass Transfer Coefficient |
(mol/(s. m2 ))/(mol/m 3 ) |
(mol/(s.ft 2 ))/(mol/ ft3 ) |
|
Mass Velocity |
g/(s.m 2 ) |
lb/(s.ft 2 ) |
|
Mole Percent |
mol% |
mol% |
|
Moles |
mol |
lbmol |
|
Moment of Inertia |
g/m 2 |
lb/ft 2 |
|
Momentum |
g.m/s |
lb.ft/s |
|
NoCategory |
NoUnit |
NoUnit |
|
Particle concentration |
particles/m 3 |
particles/ft 3 |
|
Percentage |
% |
% |
|
Percent Obscuration |
%/m |
%/ft |
|
Phase |
deg |
deg |
|
Power |
W |
Btu/s |
|
Power Factor |
cosf |
cosf |
|
Power Reactive |
var |
var |
|
Pressure |
Pa |
psi |
|
Pressure Drop Per Length |
Pa/m |
psi/ft |
|
Pulsed Power Technology |
pulse/min |
pulse/min |
|
Radiation absorbed dose |
Gy |
Gy |
|
Radiation dose equivalent |
Sv |
rem |
|
Radiation dose rate |
Sv/h |
rem/h |
|
Radioactivity |
Bq |
Bq |
|
Radioactivity Concentration |
Bq/m 3 |
Ci/L |
|
Relative density |
SG |
SG |
|
Resistance |
ohm |
ohm |
|
Resistivity |
ohm.m |
ohm.m |
|
Seasonal Energy Efficiency |
SEER |
SEER |
|
Site Specific Flow |
volumetric_flow 1 |
volumetric_flow 1 |
|
Site Specific Volume |
volume 1 |
volume 1 |
|
Site unit |
site_unit 1 |
site_unit 1 |
|
Specific Entropy |
J/(g.K) |
Btu/(lb.R) |
|
Specific Humidity |
gH2O/kg_dry_air |
grH2O/lb_dry_air |
|
Specific Volume |
m 3 /g |
ft3/lb |
|
Surface Energy Density |
J/m 2 |
J/ft 2 |
|
Surface Tension |
N/m |
lbf/ft |
|
Temperature |
C |
F |
|
Temperature Diff |
deltaC |
deltaF |
|
Temperature Rate of Change |
C/min |
F/min |
|
Thermal Conductance |
W/(m 2 .K) |
W/( m2 .K) |
|
Thermal Conductivity |
W/(m 2 .K/m) |
Btu/(h.ft 2 .F/ft) |
|
Thermal Linear Expansion |
m/C |
in/F |
|
Thermal Pressure |
psi/F |
psi/F |
|
Thermal Volume Expansion |
m 3 /C |
in 3 /F |
|
Thermoelectric Power |
V/K |
V/K |
|
Time |
s |
s |
|
Time Accuracy |
s/h |
s/h |
|
Time per temperature |
min/K |
min/K |
|
Torque |
Nm |
lbf.in |
|
Turbidity |
NTU |
NTU |
|
Velocity |
m/s |
ft/s |
|
Velocity Angular |
RPM |
RPM |
|
Voltage |
V |
V |
|
Volt Square Hours |
V 2 h |
V 2 h |
|
Volume |
m 3 |
in 3 |
Unit Exceptions
You can define unit conversion exception rules when a unit other than the default unit is preferred.
For more information, see Adding a Unit Conversion Exception .
Other Exceptions
Values are always shown using the configured unit in the following contexts:
Alarms and trend logs in wizards
Customized alarm views
Alarm and trend log properties panes
Delta Temperature Conversion
The software converts units independently of context. To correctly convert delta temperature values, the unit must belong to the Temperature Diff category.
Absolute temperature conversions include both a multiplier and an offset, for example: T (°F) = T (°C) × 9/5 + 32
Delta temperature values must therefore use the following formula:ΔT (°F) = (9/5) × ΔT (°C)
For more information, see Delta Temperature Conversion .
Value Presentation
Regional and Language Overview
Changing the WorkStation Measurement System
Select Unit Dialog Box
Adding or Changing a Unit and Prefix for a Value
Configuring Regional Settings
Delta Temperature Conversion