Dielectric Constant Settings - Emerson 5301HxxxxxxxxxxxxxxZZ Series Reference Manual

Reference Manual
00809-0100-4530
D.4.1 Use automatic echo tracking settings
When this check-box is selected, the transmitter automatically sets the echo tracking
parameters to a constant value based on the configured tank environment and
measurement mode.
D.4.2 Echo time out
This parameter defines the time in seconds before the device should start to search for a
surface echo outside the Close Distance window after it was lost. After an echo was lost,
the device does not start searching (or set Invalid Level) until the specified time has
elapsed. In some applications, especially with solid products or applications with foam, the
surface echo may disappear for periods of time. This value can be increased to prevent the
device from entering alarm mode too early after the surface is lost.
D.4.3 Close distance
The Close Distance defines a window centered at the current surface position where new
surface echo candidates can be selected. The size of the window is ±Close Distance.
Echoes outside this window will not be considered as surface echoes. The device will
without delay jump to the strongest echo within this window. This value can be increased
if there are rapid level changes in the tank. If the value is too large the device might select
an invalid echo as the surface echo.
D.4.4 Damping value
This parameter defines how fast the transmitter reacts to a change of the level value (step
response). The default value is 2 seconds.
A high value makes the level reading steady, while a low value allows the transmitter to
respond to rapid level changes (but the presented level value may be less steady). Note
that increasing the damping value will also prolong the system response time.
D.5

Dielectric constant settings

D.5.1 Adjust the vapor dielectric constant
In some applications, there is heavy vapor above the product surface having a significant
influence on the level measurement, for example, in the case of saturated water steam
under high pressure. In such cases, the vapor dielectric can be entered to compensate for
this effect.
For applications with a varying pressure and/or temperature, certain models of the
Rosemount 5300 Level Transmitter have a built-in function that automatically
compensates for varying vapor dielectric constants. See
The default value is equal to 1 which corresponds to the dielectricity of vacuum. Normally
this value does not need to be changed since the effect on measurement performance is
very small for most vapors.
Reference Manual
Advanced configuration
Dynamic Vapor Compensation.
April 2019
403