<5. Functions>
86
IM 01E21A02-03EN
IMPORTANT
When using the DC power as the transmitter power, set the commercially available power
frequency of the place where the transmitter will be used.
Set“Powersyncon/o”toOandthenset“Setpowerfreq”.
The excitation frequency and power frequency can be checked with the following parameters.
Menu path
Display Devicesetup►Detailedsetup►AUXcalculation►(seebelow)
F
OUNDATION
Fieldbus
DeviceConguration►STB►DeviceConguration►Conguration►AUXCalculation
Block
Name
Relative
Index
Parameter
Description
Display F
OUNDATION Fieldbus
STB 95 Iex power frequency Iex Power Frequency
Displays the power frequency
(synchronouswiththe
excitationfrequency).
STB 96 Meas power freq Mes Power Frequency
Displays the measured power
frequency.
5.5.5 Density Correction Calculation
Whenthetemperaturefromotherproduct(temperaturetransmitter,etc.)isobtainedfromMAO,
the density correction calculation can be performed based on temperature. The measurement
accuracyforthemassowrateisimprovedbyusingthisfunction.
Themassowrateiscalculatedusingthefollowingformula.
V
m
=V
f
xρ
V
m
:Massowrate[kg/s]
V
f
:Volumetricowrate[m
3
/s]
ρ:Density[kg/m
3
]
When the density correction calculation is performed based on temperature, the density is
obtainedusingthefollowingformula.Thedensitycompensatingratesmustbespeciedbased
on applications that use this product.
ρ
r
=ρ
n
×{1+a
1
×(T
r
-T
n
)×10
-2
+a
2
×(T
r
-T
n
)
2
×10
-6
}
ρ
r
:Densitycorrectedbasedonthemeasuredtemperature[kg/m
3
]
ρ
n
:Standarddensity[kg/m
3
]
T
r
:Measuredtemperature[°C]
T
n
:Standardstatetemperature[°C]
a
1
: Primary compensating rate
a
2
: Secondary compensating rate
This function can be used only for AXG, not for AXW. The standard temperature and the
compensatingratescanbeconguredwiththefollowingparameters.
Menu path
Display Devicesetup►Detailedsetup►Provar►Temperature►(seebelow)
F
OUNDATION
Fieldbus
DeviceConguration►STB►DeviceConguration►Conguration►Process
Variables►Temperature►(seebelow)