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7.5.3
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
K
x
100%
4.1)
X =
GK
DN
x
Q
full-scale range (100%) in volumetric unit V per unit time t
100%
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
V
Liter
m3
US gallons
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:
4.4)
Calculate setpoint reading "f" for pulse output:
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. 8.4.
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
7/7
2
t
Sec
25 464
25 464 800
96 396
Installation and operating instructions IFC 020
min
424.4
7.074
424 413
7 074
1 607
26.78
+ Y (I
I = I
0%
I
current (0/4mA) at 0% flowrate
0%
I
current (20mA) at 100% flowrate
100%
f = Y
P
x
X
P
pulses per second (Hz)
100%
at 100% flowrate
.
hr
- I
) in mA
100%
0%
X
in Hz
100%
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