Manual

<5. Parameter Setting>
5-7
IM 01C25T04-01EN
<5> To conrm entered coordinate.
• Procedure to call up the display
DTM [Device] → Conguration →
Characterization → Table Data
EDD [Device] → Characterization →
Linearization Table
5.3.4 Calculate Coefcient (For ow rate
calculation)
Calculate Coefcient is constant mainly for
calculation of ow rate output signal. Follow
below procedure to set the Calculate Coefcient.
Sensor Transducer Block Target Mode needs to
be changed to Out of Service (O/S) before enters
Calculate Coefcient.
DTM Input → Target Mode
EDD Input → Sensor Transducer Block →
Target Mode
• Procedure to call up the display
DTM, EDD Input → Sensor Transducer Block →
Calculated Value → Calculate Coefcient
There are two methods for the calculation of the
Calculate Coefcient (below Kfactor).
Method 1: Calculating the Kfactor by ow
parameters
Method 2: Calculating the Kfactor by means of the
ow condition
Method 1. Calculating the Kfactor by ow
parameters.
<1> Selection of the ow equation
Select the desired operational expression
according to the uid type and the ow unit
category shown in Table 5.2.
<2> Conrming the unit
The unit to be used in this calculation is as
follows:
Differential pressure: Pa
Static Pressure: kPa abs
Temperature: K
The dimension of the pressure unit Pa are
M•L
-1
•S
-2
Where M: mass (Kg)
L: Length (m)
S: Time (second)
<3> Preparation of ow parameters for Kfactor
calculation
Each parameter must be expressed in the
following units.
d: m,
ρb and ρnorm: Kg/m
3
C, β, ε and K has no dimensions
<4> Calculation of the unit conversion coefcient Nc
The ow rate value does not change
automatically when a ow unit parameter is set
for the transmitter, and is always output as Kg/s
(mass ow). M
3
/s (volume ow), Nm
3
/s (Normal
volume ow.)
In order to obtain a value in your designated
unit, it is necessary to set Nc.
Nc is a conversion coefcient for the ow and
DP unit that is designated to be used.
<5> Selection of the Kfactor equation and
calculation Select the Kfactor expression
according to the unit category shown in Table
5.2.
Calculate the Kfactor using the parameters and
the expression.
<6> Enter Kfactor as shown in beginning of this
section.
IMPORTANT
If either the setting of ow unit or differential
pressure unit is changed, Kfactor and Nc must
be recalculated.
Table 5.2 Flow Operational Expression
T0501.ai
Flow unit Category
Kfactor Flow
Normal · Standard
Volume Flow
Volume Flow
Mass Flow
Kfactor = /4×Nc×C/ 1–β
4
×ε×d
2
× 2×ρb
Kfactor = /4×Nc×C/ 1–β
4
×ε×d
2
× 2×ρb /ρnorm
Kfactor = /4×Nc×C/ 1–β
4
×ε×d
2
× 2/ρb
Qm, Qv or Qv_norm = Kfactor × ∆P