13
6.3.4 Damping function
With unsteady level (e�g� turbulence, wave movements���) display and output
response may be damped� During damping the determined level values are
"smoothed" by means of a mean filter; the result is a steady curve� Damping
can
be set by means of the parameter [dAP] (→ 11.4.10)�
[dAP] indicates in seconds after what time 63 % of the final value are reached in
the event of a sudden jump� After 5 x [dAP] almost 100 % have been reached�
6.3.5 Rods for different tank heights
• The unit can be installed in tanks of different sizes� Rods in different lengths
are available� To adapt to the tank height, each rod can be shortened� The
minimum probe length is 150 mm, the maximum probe length is 2000 mm�
• For ease of installation and removal the rod connection can be rotated without
restriction�
6.3.6 Defined state in case of a fault
• In case of a fault a state can be defined for each output�
• If a fault is detected or if the signal quality is below a minimum value, the
outputs pass into a defined state, according to NAMUR recommendation in
case of the analogue output� For this case the response of the outputs can be
set via the parameters [FOU1], [FOU2] (→ 11.4.9)�
• Temporary loss of signal caused e�g� by turbulence or foam formation can be
suppressed by a delay time (parameter [dFo] (→ 11.4.11))� During the delay
time the last measured value is frozen� If the measured signal is received again
in sufficient strength within the delay time, the unit continues to work in normal
operation� If, however, it is not received again in sufficient strength within the
delay time, the outputs pass into the defined state�
In case of heavy foam formation and turbulence, note the examples of how
to create a steady area (→ 7.2.6)�
To Next Page
Loading...