KROHNE IFC 020 Converter EN - Manual (Page 46)

Output signals can be stabilized to values as for “zero” flow to prevent random output signals
when the measuring tube is empty or when the electrodes are not wetted in the event the
measuring tube is partially full.
- Display: 0
- Current output: 0 or 4 mA, see setting in Fct. 1.05
- Pulse output: no pulses (= 0 Hz), see setting in Fct. 1.06
Precondition: - electrical conductivity of product: ≥ 200 µS/cm,
≥ 500 µS/cm for meter sizes DN 2.5 - 15 and 1 /
10
” - 1 /
2
”
- Signal cable length ≤ 10m and vibration free with signal converter
- Homogeneous liquid products, free of solids and gasses an do not tend to
electrical or catalytic reactions.
Changes on amplifier PCB, see Fig. in Sect. 8.8.
Switch off power source before opening the housing!
Fig. A, B and D are situated in Section 8.1!
1)
Unscrew 4 recessed head screws (Fig. A) and remove transparent cover.
2) Unscrew 4 recessed head screws (Fig. B) and remove black plastic cover.
3) Unscrew 2 recessed head screws (Fig. D) and remove black metal cover.
4) Unscrew 4 recessed head screws and fold display to the side carefully.
5) Join the two “semicircles” of points S1 and S3 on the amplifier board with tin solder,
see illustration in Sect. 8.8.
6) Reassemble in reverse order, points 4) - 2) above.
7) Switch on power.
8) Check setting of the low-flow cutoff SMU, Fct. 1.03, and reset if necessary:
L.F.CUTOFF switched on, range:
Operator control:
See Sect. 4 and 5.3 Fct. 1.03.
9) After checking and/or resetting,
replace the transparent cover and tighten the 4 recessed head screws.
6/3
6.3 Stable signal outputs when measuring tube empty
IFC 020 K and IFC 020 F
Montage- und Betriebsanleitung IFC 020
Full scale range Q
100%
Cutoff ...... values
... OFF ... ... ON ...
> 3 m/s > 10 ft/s > 0 2 % 1 %
1 - 3 m/s 3 -10 ft/s > 0 6 % 4 %
< 1 m/s < 0 3 ft/s >10 % 8 %