KROHNE ALTOFLUX 2W IFM 4042K EN User Manual
Page 22
Section 4.4
Part B IFC 040 Signal converter
ALTOFLUX 2W
02/2001
22
4.4
Table of settable functions
Display texts
Description and settings
FCt. 1.1
FULL SCALE
→
Full-scale range
XXX.XXX
m3/h
l/s
Ga./m
↑
"user unit"
Range:
0.3-12 m/s = 1-40 ft/
s
↵
Set full-scale range, i.e. for the maximum occurring flow rate.
This affects all functions where values have to be set as % of
full-scale range:
Fct. 1.3 SMU
Fct. 1.5 Current output
Fct. 1.7 Status output
Fct. 2.1 Test Q
Fkt. 3.4 Application
FCt. 1.2
TIME CONSTANT
→
Time constant
XX.X
S
Range 0.5 ... 99.9s
Standard 3.0s
↵
Setting the time constant for a two-pole low pass for signal
damping. This time is needed after an abrupt change in the
flow rate in order to attain 67% of the new flow value.
The time constant acts equally on the current output and the
display, and also on the status output when the ‘sign’ or ‘limit
value’ functions are selected.
The value can be transmitted via the HART interface with or
without use of the time constant.
If the time constant is changed, the noise level needs to be
reset if the noise filter is activated (see Fct. 3.4 Application
“Filter setting").
FCt. 1.3
L.F. CUTOFF
→
Low-flow cutoff (SMU)
For characteristic, see Fig. 1 in Section 2.3
XX XX
Perc.
Range 1 ... 20%
(1
st
value < 2
nd
value)
Standard: 04 ... 05%.
↵
At low flows, flow display and counting are suppressed. This
also applies to the negative flow direction.
Cutoff ‘off’ value (1st figure) and cutoff ‘on’ value (2nd figure)
must be set as a percentage of the full-scale range (see Fct.
1.1 Full-Scale). The SMU acts on the current output, pulse or
status output, all counters and also values via the HART
interface and the display.
FCt. 1.4
DISPLAY
→
Display
Setting for display form of measured values and messages in
the local display. The following settings are possible:
inFo
diSPlaY Flow
↵
Display of flow
Edit
Percent
no diSPlaY
m3/h
l/s
Ga./m
↑
"user unit"
Standard: Percent
↵
Select unit for display of current flow.
Nothing displayed when “no display" has been set.