Emerson Rosemount 5408 Reference Manual page 212

Configuration Parameters
November 2017
Table C-4. List of Input Registers to the User Defined Variable
Variable
Min Electronics Temperature
Max Electronics Temperature
Surface Update Relation
Min Signal Quality
Max Signal Quality
Distance to Upper Surface
Distance to Lower Surface
Surface Signal/Noise Ratio
Product Dielectric Constant
Unit
Units of measurement of the user defined variable.
More advanced options
By default, these parameters are automatically set based on current configuration. It is recommended
that these parameters should remain at the default settings, unless there is a good understanding of the
function and capability of the parameters.
Empty tank handling
The Empty Tank Handling functions handle situations when the surface echo is close to the tank bottom.
Empty tank detection area
The Empty Tank Detection Area defines a range where it is accepted to lose the echo from the product. If
the echo is lost in this range, the tank is considered empty and the level is presented as 0.
When the tank is empty, the transmitter looks in this range for the product surface. When a new echo is
found in this range, it is considered to be the product surface. Therefore, if there are disturbance echoes
in this area, they may need to be filtered out.
1. Only available in Rosemount Radar Master Plus.
200
Register Description
20146 Minimum electronics temperature measured by the device (°C)
20148 Maximum electronics temperature measured by the device (°C)
Determines how robust the surface echo measurement is (0 to
21028 1). A decreasing value may be used to identify turbulence or
foam in the process.
Minimum signal quality measured by the device since last signal
21034 quality reset. Signal quality calculation must be enabled to use
this variable.
Maximum signal quality measured by the device since last signal
21036 quality reset. Signal quality calculation must be enabled to use
this variable.
Distance to the upper product surface (m) when measuring on
21042 multiple products in the tanks. Double Surface function must
be enabled to use this variable.
Distance to the lower product surface (m) when measuring on
21044 multiple products in the tanks. Double Surface function must
be enabled to use this variable.
Ratio between surface echo signal strength and signal noise
21054
(dB). A high value (>20 dB) indicates very good margin to noise.
Square root of the product dielectric constant estimated by the
transmitter when the Bottom Projection function is enabled.
The product dielectric constant is calculated when both the
22800
bottom and surface echoes are found by device, and when
surface echo is within the Max Projection Distance. Product
dielectric constant estimation is frozen if any of these conditions
are not fulfilled.
(1)
Reference Manual
00809-0100-4408, Rev BA
Configuration Parameters