KROHNE IFC 210 E-EEx EN - Manual (Page 62)

Sect. 6.4 Part C Special applications, functional checks, service, and order numbers
IFC 210 E 05/2002
62
6.4 Pulsating flow
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” !
Application
downstream of positive-displacement pumps (reciprocating or diaphragm pumps) without
pulsation dampener
Operator control of the signal converter for the new settings, see Sect. 4 and 5.
To change settings
•
Fct. 3.2 Field Frequency (change magnetic field frequency)
−
Stroke frequency less than 80 strokes/min (at max. pump lift): do not change setting.
−
Stroke frequency 80 – 200 strokes/min (at max. pump lift): change setting to 1/2,
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”),
Please consult factory where other types and meter sizes are concerned.
−
Please note: given stroke frequencies close to the tripping point of 80 strokes/min,
additional measuring errors of approx. ± 0.5% of the measured value may occasionally
occur.
•
Fct. 3.06 Application (adjust overload point of the A/D converter to the application) Change
setting to “pulsating”.
•
Fct. 1.04 Display (change display presentation of flow)
Change setting to “Trend” to allow better assessment of display unsteadiness.
•
Fct. 1.02 Timeconstant (change time constant)
−
Set to “All” and time (t) in seconds.
1000
− Recommended: t [Sec] =
min. strokes / min
−
Example: min. number of strokes in operation = 50 strokes/minute
1000
t [Sec] =
50 / min
= 20 Sec
With this setting, the residual ripple of the display will amount to
approx.
±
2% of the measured value. Doubling the time constant will
reduce the residual ripple by a factor of 2.