KROHNE IFC 210 E-EEx EN - Manual (Page 73)

Part C Special applications, functional checks, service, and order numbers Sect. 7.6
05/2002 IFC 210 E 73
Example
Full-scale range Q
100%
= 200 m 3 /hr (Fct. 1.01)
Meter size DN = 80 mm = 3” (Fct. 3.02)
Current at Q
0%
I
0%
= 4 mA
Q
100%
I
100%
= 20 mA
}
(Fct. 1.05)
Pulses at Q
100%
P
100%
= 200 Pulse/hr (Fct. 1.06)
Primary head constant GK = 3.571 (s. Geräteschild)
Constant (V in m
3
)
(t in hr) K = 7074 (see Table)
(DN in mm)
Calculation of „X“ and position of „Y“
Q
100%
x K 200 x 7074
X =
GK x DN 2
=
3.571 x 80 x 80
= 61.905
Y = 40, position of switch Y, see front panel GS 8A
(comes closest to X value and is smaller than X).
Calculation of setpoint readings I and f
40
I = I
0%
+ (I
100%
- I
0%
) = 4 mA +
61.905
(20mA - 4mA) = 14.3mA
Deviations are permissible between 14.1 and 14.6 mA (equivalent to ± 1.5 %)
40
f = x P
100%
=
61.905
x 200 pulses/hr = 129.2 pulses/hr
Deviations are permissible between 127.3 and 131.1 pulses/hr (equivalent to ± 1.5 %)
If you need to return your flowmeter to KROHNE,
please refer to last but one page of these Instructions !
Y
X
Y
X