KROHNE IFC 210 E-EEx EN - Manual (Page 65)

Part C Special applications, functional checks, service, and order numbers Sect. 6.6
05/2002 IFC 210 E 65
Changes on amplifier PCB, see Fig. in Sect. 8.7.
Always switch off power source before starting work!
Please refer to the Figure in Sect. 8.1.
1) Detach 4 screws (S1) from the front side.
2) Pull the plug-in module out of the subrack.
3) Detach 4 recessed-head screws (S3) on the rear side and remove the imprinted rear panel
from the plug-in unit.
4) Carefully pull the now visible rear panel with mounted pc boards out of the plug-in unit.
5) On the back of the amplifier board, join the “semicircles“ of 2 points with tin-lead solder,
depending on activation of the desired function, see Table and Figures in Sect. 6.6.
Previous to that, carefully scrape off the protective varnish at the selected soldering points
............. Be careful not to damage circuit-board conductors.
6) Assemble in the reverse order, Points 4) – 1).
7) Power the unit.
8) For LA / S2 (empty tube stabilization) and LA / S4 (electrode cleaning and empty tube
stabilization), check the setting of the low-flow cutoff SMU, Fct. 1.03, and reset if necessary:
L.F.Cutoff switched on, range: Full scale range Q
100%
Cutoff ...... values
... OFF ... ... ON ...
> 3 m/s > 10 ft/s > 2 % 1 %
1 – 3 m/s 3 -10 ft/s > 6 % 4 %
< 1 m/s < 3 ft/s > 10 % 8 %