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SAW sensor - Parameter
Type 8098
13.12
Setting the refresh time
13.12.1
Use case of the refresh time
The refresh time is the minimum time needed to update a measurement value. The refresh time has no
effect on the damping of the measured values.
The refresh time of the temperature values is a constant but the refresh time of the other measurement
values can be adapted to the process:
•
A very short refresh time is needed if the process requires quick measurement updates, for example for
very short dosings.
• A long refresh time is sufficient if for example there are slow flow rate changes in the process.
13.12.2
Changing the refresh time
3 refresh times are available:
•
a
Long
refresh time, i.e. the duration between 2 measurement updates is approximately 100 ms.
•
a
Short
refresh time, i.e. the duration between 2 measurement updates is approximately 70 ms. Default
setting.
•
a
Very short
refresh time, i.e. the duration between 2 measurement updates is approximately 30 ms.
If the very short refresh time is set:
•
The diagnostics event
Not totally filled
is not available
• The measurement deviation for a flow rate between 10% of the full scale and the full scale is
±0,6%
• The repeatability for a flow rate between 10% of the full scale and the full scale is ±0,3%
If a digital output*) is configured as a pulse output, the following durations must be added to the last
received pulse:
• 50 ms, if the refresh time is set to
Very short
,
• 80 ms, if the refresh time is set to
Short
,
• 140 ms, if the refresh time is set to
Long
.
To change the refresh time, do the following:
→
Select the device in the navigation area.
→
SAW sensor
→
Parameter
→
Refresh time
→
Select the refresh time.
The refresh time is changed.
*
)
Only variant with outputs.
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