KROHNE IFC 210 E-EEx EN - Manual (Page 72)

Sect. 7.6 Part C Special applications, functional checks, service, and order numbers
IFC 210 E 05/2002
72
Check of setpoint display
1)
Switch on power supply, allow at least 15 minutes’ warm-up time.
2) Set switch D (front panel of GS 8A) to “0” position.
3) Adjust zero to 0 or 4 mA with the 10-turn potentiometer P (front panel of GS 8A),
depending on setting in Fct. 1.05, deviation < ±10 µA.
4) Calculate position of switch Y and displayed setpoints ”I“ and ”f“:
Q
100%
×
K
4.1) X =
GK
×
DN
2
Q
100%
full-scale range (100%) in volumetric unit V per unit time t
GK primary constant, see instrument nameplate
DN meter size DN im mm, not inches, see instrument nameplate
t time in seconds (Sec), minutes (min) or hours (hr)
V volumetric unit
K constant, according to following table :
t Sec min hr
V
Liter 25 464 424.4 7.074
m 3 25 464 800 424 413 7 074
US-Gallonen 96 396 1 607 26.78
4.2) Determine position of switch Y: Use table (front panel GS 8A) to determine value Y,
which comes closest to factor X and meets condition Y
≤
X.
4.3) Calculate setpoint reading ”I“ for current output: I = I
0%
+ (I
100%
- I
0%
) in mA
I
0%
current (0/4mA) at 0% flowrate
I
100%
current (20mA) at 100% flowrate
4.4) Calculate setpoint reading ”f“ for pulse output: f =
×
P
100%
in Hz
P
100%
pulses per second (Hz)
at 100% flowrate
5) Set switch D (front panel GS 8A) to position “+“ or “-“ (forward/ reverse flow).
6) Set switch Y (front panel GS 8A) to the value determined by the method described above.
7) Check setpoint readings I and f, see points 4.3 and 4.4 above.
8) Deviation < 1.5% of setpoint. If greater, replace signal converter, see Sect. 8.3.
9) Test of linearity: set lower Y values, readings will drop in proportion
to the calculated Y values.
10) Switch off power supply after completing the test.
11) Disconnect the GS 8A.
12) Reassemble in reverse order, see points e) – b) under “electrical connection”,
see illustration in Sect. 8.1.
13) The system is ready for operation after the power supply has been switched on.
Example: see overleaf
Y
X
Y
X