User Manual

Installation and operating instructions IFC 020
6/6
Unsteady display and outputs 6.6
Unsteady display and outputs can occur in connection with
– high solids contents,
– non-homogeneity,
– poor blending, or
– chemical reactions still in progress in the process liquid.
If, in addition, flow is also pulsating due to the use of diaphragm or reciprocating pumps,
refer to Sect. 6.4.
Operator control of the signal converter for the new settings, see Sect. 4 and 5
To change settings
• Fct. 1.04 DISP
. FLOW (change display presentation of the flow)
Change setting to “BARGRAPH” to allow better assessment of display unsteadiness.
• Fct. 1.02 TIMECONST
. (change time constant)
– Setting to “ONLY I”, to “ALL” if pulse output too unsteady.
– Set time constant to approx. “20 s”, observe unsteadiness of display and adjust time
constant if necessary.
• Fct. 3.06 APPLICA
T. (adjust overload point of the A/D converter to the application)
Set to “PULSATING” on trial basis, if unsuccessful return to “STEADY”.
• Fct. 3.02 FIELD
FREQ. (change magnetic field frequency)
On trial basis, change setting to “1/2”; if unsuccessful return to previous setting,
usually “1/6”.
Only practical with IFM 5020 K and IFS 5000 F (DN 2.5-100 /
1
/
10
”-4”)
and IFM 4020 K and IFS 4000 F (DN 10, 15, 50-100 /
1
/
10
”,
1
/
2
”, 2”-4”),
Consult factory where other types and meter sizes are concerned.