102
SAW sensor - Parameter
Type 8098
13.8
Setting the parameters of the density factor (optional
feature)
13.8.1
What is the density factor?
The density factor is a dimensionless measurement value which can be used to identify the liquid flowing
through the pipe.
The density factor is a non-calibrated acoustic measurement based on the measurement of the speed of
sound in the liquid and can be compensated by temperature. The density factor gives an idea of the the
density of most of aqueous liquids. By default, the temperature compensation is related to water.
→
To set a temperature compensation, refer to chpt.
Air bubbles in the liquid have an unwanted effect on the density factor accuracy.
The device measures density factors in the range of 0.8 – 1.3:
• If a liquid flowing through the pipe has a higher density than water, the measured density factor is higher
than 1.
• If a liquid flowing through the pipe has a lower density than water, the measured density factor is lower
than 1.
Examples of density factor ranges:
•
The density factor of water is in the range of 0.95 – 1.05.
•
The density factor of tomato ketchup is in the range of 1.1 – 1.3.
13.8.2
Giving a user defined name to the measured density factor
The name is used to identify the process value in the user defined views and in all the menus where the
process value is displayed (for example in the
Outputs
menu).
By default, the name associated to the measured density factor is
Density factor
.
To add a user defined name to the default name, do the following:
→
Select the device in the navigation area.
→
SAW sensor
→
Parameter
→
Add. meas. values
→
Density factor
→
Value name
→
Enter the name. The name can have up to 19 characters.
→
Apply
The name is changed.
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