KROHNE IFC 020 K Installation And Operating Instructions Manual page 57

Full-scale range
Meter size
Current at Q
0%
Q
100%
Pulses at Q
100%
Primary head constant
Constant (V in m3)
(t in hr)
(DN in mm)
Calculation of " X " and position of " Y "
Q x K 200 x 7074
100%
X = =
2
GK x DN 3.571 x 80 x 80
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
Y
I = I + (I - I
0% 100% 0%
X
Deviations are permissible between 14.1 and 14.6 mA (equivalent to ± 1.5 %).
Y 40
f = x P =
100%
X 61.905
Deviations are permissible between 127.3 and 131.1 pulses/hr (equivalent to ± 1.5 %).
please refer to last but one page of these Instructions !
Q = 200 m
100%
DN = 80 mm = 3" (Fct. 3.02)
I = 4 mA
0%
I = 20 mA
100%
P = 200 pulses/hr (Fct. 1.06)
100%
GK = 3.571 (see nameplate)
K = 7074 (see Table)
= 61.905
40
) = 4 mA + (20mA - 4mA) = 14.3 mA
61.905
x 200 pulses / hr = 129.2 pulses/hr
If you need to return your flowmeter to Krohne,
Installation and operating instructions IFC 020
/hr (Fct. 1.01)
3
}
(Fct. 1.05)
Example 7.5.4
7/8