9 Block BASIC FUNCTION Device Functions Proline Promass 83 MODBUS RS485
114 Endress+Hauser
REFERENCE
TEMPERATURE
MODBUS register:
Data type:
Access:
6464
5136
Float
read/write
! Note!
Function is not available unless the CALCULATED REFERENCE DENSITY setting
was selected in the CORRECTED VOLUME CALCULATION function (6460).
For entering the reference temperature for calculating the corrected volume flow,
the corrected volume and the reference density.
User input:: 5-digit floating-point number
Factory setting: 20.000 °C
The reference density is calculated as follows:
ρ
N
= ρ · (1 + α Δ t + β Δ t
2
) ; Δ where t = t - t
N
ρ
N
= Reference density
ρ = currently measured fluid density (measuring value Promass)
t = Actual measured temperature of fluid (measuring value Promass)
t
N
= Reference temperature for calculating the reference density (e.g. 20 °C)
α = Vol. expansion coefficient of the fluid, unit [1/K] (K = Kelvin)
β = Square vol. expansion coefficient of the fluid, unit [1/K
2
]
Function description
BASIC FUNCTION → PROCESS PARAMETER → REFERENCE PARAMETER
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