Volume Flow Accuracy; For Liquids; For Gases; Accuracy Of Temperature - Siemens SITRANS FC720 Operating Instructions Manual

Volume flow accuracy

8.6 Volume flow accuracy

8.6.1 For liquids

The following formula can be used to calculate the accuracy of liquid volume flow:
D
D
V
Δρ
D
ρ

8.6.2 For gases

Accuracy of standard volume flow for gas with a fixed reference density equals the
maximum deviation D of the mass flow.
D
The specified accuracy is then only valid for reference gas density. Gas
composition changes can have different reference density leading to accuracy
deviation.

8.7 Accuracy of temperature

Accuracy of temperature depends on the sensor temperature range selected (see
Process fluid temperature range [} 37]) and can be calculated as follows:
Formula for
ΔT = 0.5 °C + 0.005
specified
temperature range
ΔT
Standard and
Medium
T
pro
Formula for ΔT = 1.0 °C + 0.008
specified
temperature range
ΔT
High
T
pro
( )
2
∆ρ
= D + × 100%
2
V ρ
Maximum deviation of volume flow in %
Maximum deviation of density in kg/l
Maximum deviation of mass flow in %
Density in kg/l
= D
V
× │T
pro
Maximum deviation of temperature
Process fluid temperature in °C measured by SITRANS FC
× │T
pro
Maximum deviation of temperature
Process fluid temperature in °C measured by SITRANS FC
- 20 °C│
- 20 °C│
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