Technical data

69
LevelWave LR01HB EML3020 A-(en)
2.5.2 TRACKING VEL. Maximum tracking velocity. This value must
agree with the maximum rate of change of
the level of the liquid in the tank.
min-max: 0.1…10.0 m/min 0.5 m/min
2.5.3 Er PRODUCT For measurement in TBF mode only. The
device automatically calculates the level
based on the product ε
r
. If you select "TBF
Partial" or "TBF Full" in menu item 2.5.4
MEASUR.MODE, you can change the ε
r
value manually to adjust readings.
min-max: 1.100 to 10.000 2.000
2.5.4 MEASUR.MODE The device uses the dielectric constant (ε
r
)
of the tank contents to monitor level. In
direct mode (if the dielectric constant is
high), the level signal is a reflection on the
surface of the tank contents. If the dielectric
constant is low, the device uses TBF mode.
The device in TBF mode uses the radar
reflection on the bottom of the tank (the
signal goes through the tank contents). The
tank must have a flat bottom for the device
to operate correctly in TBF mode. This
menu item is set by default to "Direct" for
tank contents with an ε
r
>1.8. If ε
r
is very
low (<1.6), use "TBF Full". If ε
r
is low (ε
r
=
1.5...1.7), use "TBF Partial" mode. "TBF
Partial" is an automatic mode that lets the
device make a selection between "Direct
mode and "TBF" mode. If you use "TBF
Full" or "TBF Partial", enter the dielectric
constant in menu item 2.5.3 Er PRODUCT.
Refer also to "Measuring principle" on page
91.
Direct, TBF Partial, TBF
Full
Direct
2.5.5 OVERF. ENAB. If this function is in operation, the device will
monitor the level even if it is in the blocking
distance. The reading shown on the display
stays fixed at the blocking distance if the
level is higher than the blocking distance.
The output will show that the tank is full. An
error is recorded by default.
If this function is not in operation, the
device looks for the largest signal between
the process connection and the tank
bottom.
YES, NO NO
2.5.6 MULT.REF.EN. Multiple reflections will cause the device to
display smaller level readings. Objects in
the tank, sharp corners, installation of the
device on a large nozzle or at the centre of
a dome roof, and low dielectric products
(ε
r
= 1.8...5) can cause multiple reflections.
A very calm surface or a tank with a small
convex or flat roof can also cause multiple
reflections.
If this function is in operation, the device
looks for the first signal peak below the
process connection. This signal peak is
then used to measure the level of the tank
contents. If this function is not in operation,
the device looks for the largest signal below
the process connection.
YES, NO NO
2.5.7 EMP.SPEC.EN. The supervisor can start or stop the empty
spectrum filter.
YES, NO NO
2.6.0 COMMUNICAT.
2.6.1 ADDRESS
Any HART
®
address greater than 0 will
activate HART
®
multidrop mode. The
current output stays constant at 4 mA.
min.-max: 0…63 0
Menu
No.
Function Function description Selection list Default