KROHNE IFC 210 E-EEx EN - Manual (Page 61)

Part C Special applications, functional checks, service, and order numbers Sect. 6.3
05/2002 IFC 210 E 61
6.3 Unsteady display and outputs
Important, please note!
•
Observe the directions and regulations and the electrical data specified in the
EC type test certificate.
•
In addition to the regulations for heavy-current installations (VDE 0100),
pay particular attention to the requirements specified in EN 60079-14 “Electrical
equipment in hazardous areas”.
•
Assembly, installation, commissioning and maintenance work may only be carried
out by ”personnel trained in explosion protection” !
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 Display Flow (change display presentation of the flow)
Change setting to “Trend” to allow better assessment of display unsteadiness.
•
Fct. 1.02 Timeconstant (change time constant)
– Setting to “Only Current 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 Application (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 Frequency (change magnetic field frequency) On trial basis,
change setting to “1/2”; if unsuccessful return to previous setting, usually “1/6”.
Only practical with IFS 5000 F (DN 2.5-100 / 1 /
10
”-4”)
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.