Pumps
Use pumps free from pulsation (volumetric types). Positive
displacement pumps
Inherently produce pulsations which can cause measurement
errors.
Air Separation
If there is danger of en trained air being present in the liquid
then a suitable de-aeration device must be installed upstream
of the meter otherwise air will be measured as liquid.
CLEANING IN SITE
When a system is to be cleaned in place, sterilized or purged
without removal of the meter from the fine, it is advisable to
provide the meter with a by-pass to prevent damage occurring
!o the internal working parts unless the following
reccommenations can be adhered to:
Liquid detergent temperatures in excess of the maximum
stated in the meter specification should not be used for
cleaning purposes or distortion and expansion of the disc
will result, causing the piston to
"
bind
"
within the chamber.
Check that cleaning fluid will not attack or corrode the
material of the meter.
Sterilization with steam is not admitted. If it is necessary the
pressure of the in-coming steam to the meter must be
carefully controlled so that the velocity of the disc within the
chamber is kept below 75% of its maximum velocity when
metering with liquids. the same must be done when purging
the system with air.
After steam sterilization or air purging during re-charging of
the pipe with fluid, care must be taken to avoid impact of
high speed fluid re-entering the empty measuring chamber.
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