KROHNE ALTOFLUX 2W IFM 4042K EN - Manual (Page 31)

Part B IFC 040 Signal converter Section 4.4
02/2001 ALTOFLUX 2W 31
Display texts Description and settings
selection “Pulse Filter" ... pulsed interference is suppressed. In addition to the setting
“Limitation” over the total measuring range, see above,
“Pulse duration” and “Pulse limitation” dynamically limit
abrupt changes in the measured value.
inFo
PulSe duration
↵
Pulse duration
XX.X
S
Range 0.1 ... 25.0 s
Standard: 1.0 s
↵
Setting the pulse duration limitation
Time must be longer than the duration of the pulsed
interference (see Fig. 7 in Section 2.3).
inFo
PulSe limit
↵
Pulse limitation
XXX
Perc
Range 1 ... 100 %
Standard: 5 %
↵
The pulse limitation allows setting of the size of change from
one measured value to the next (as percentage of the full-
scale range, see Fct. 1.1).
selection “noiSe Filter" ... suppresses unsteady measured values caused e.g. by low
electrical conductivity of the process liquid or high solids
contents. When noise filter is activated, the “Limitation”, see
above, should be set to 1000%, otherwise measured values
are too low in the upper flow range.
inFo
noiSe SuPPreS.
↵
Noise rejection
Edit
two timeS
three timeS
↑
four timeS
Standard: two times
↵
The level of noise rejection can be selected as a factor of the
interference level.
inFo
noiSe Flow
↵
Noise flow
Adjustment when noise is dependent on flow.
XXX
Perc.
Range 5 ... 100 %
Standard: 20 %
↵
•
approx. 20% in normal 2-wire operation
•
approx. 80% when operated with power booster
in both cases as percentage of full-scale range (see Fct. 1.1)
(see Fig. 6 in Section 2.3)
inFo
noiSe level
↵
Noise level
Setting of the noise level (unsteadiness) that can be
observed without use of the filter.
XX.X
Perc.
Range 0.1 ... 25.0 %
Standard: 5 %
↵
Setting the noise level “peak-to-peak”
(e.g. width on a recorder or difference between minimum and
maximum value in display) as percentage of full-scale range
(see Function 1.1).
Measurement at high flow rate (maximum flow rate) when
filter deactivated. If time constant has been changed (see Fct.
1.2) this setting must be carried out again. The filter will not
take effect if the noise level is set too low. It is better to set
the noise level too high rather than too low (see Fig. 6 in
Section 2.3).