Hydrotec HydroDOS HD550G, Руководство по эксплуатации и обслуживанию, Страница: 45 / 103

I-45/103
Last change 04/2016 E-P – AL/TW/PW | Subject to technical modifications
Failure Reason Remedy
Dosing capacity of
pump not exact Dosing head not de-aired
totally Repeat de-airing
Out gassing material Check installation
Valves partly contaminated or
crusted Clean valves
False monitoring of dosing
capacity Calibrate
Counter pressure fluctuations Installation of a pressure hold
valve and pulsation damper
(muffler)
Intake height fluctuations Keep intake level constant
Pre-pressure higher than
counter pressure Installation of pressure hold valve
Leaking or porous intake line
or pressure pipe Replace intake line or pressure
pipe
Components coming in
contact with the material not
resistant Replace by resistant materials
Worn dosing membrane
(initial cracks) Replace membrane
Modification of dosing
material (density, viscosity)
Check concentration; possibly
install an agitator
Loud creaking noise Resonance noises of the step
index motor may be audible
short-term at dosing
efficiency <10% of maximum
pump dosing capacity.
The resonance noise of the index
motor is no failure at all.
Liquid penetrates at
flange between pump
and dosing head Faulty membrane Replace membrane
Call our service personnel!