Watson-Marlow SPS - Manual (Page 5)

MasoSine SPS sinusoidal pumps User Manual 5
Storage
This product has an extended shelf life. However, plastic parts and elastomeric
parts should be stored in a cool, dry environment. The blue polyamide gate should
be stored in cool, clean water if it will be out of use for more than four weeks. Care
should be taken after storage to ensure that all parts function correctly.
5 Information for returning pumps
Equipment which has been contaminated with, or exposed to, body fluids, toxic
chemicals or any other substance hazardous to health must be decontaminated
before it is returned to MasoSine or its distributor.
A certificate included at the rear of these operating instructions, or signed state-
ment, must be attached to the outside of the shipping carton. This certificate is
required even if the pump is unused. See 28 Decontamination certificate.
If the pump has been used, the fluids that have been in contact with the pump and
the cleaning procedure must be specified along with a statement that the equipment
has been decontaminated.
If a returned pump requires cleaning, a charge will be made. Internal parts that have
not been decontaminated will be replaced and a charge will be made.
6 Sinusoidal pumps—an overview
The functioning principle of MasoSine pumps is ingeniously simple.
The pump consists of modular components.
The sinusoidal rotor creates a chamber within the pump body four times per revolu-
tion, in which the pumped fluid is displaced. As a filled chamber rotates, it contracts,
closes and discharges its contents. At the same time, the opposite chamber opens
by the same fraction of a millimetre to draw in more fluid. The result is a pump free
of pulsation.
The gate works as a seal between the pressure side and the suction side of the
pump. It prevents an equalization of the pressure created by the rotor, stopping it
escaping to the suction side.