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Watson-Marlow 620DuN and 620Du User Manual 102
33 620L and 620LG pumpheads
The twin offset track design of the 620L utilises 4.0mm wall double-Y tube elements
to overcome pulsation for accurate dosing and dispensing. The 620L accepts Silicone
and Marprene tubing up to 16.0mm bore.
Alternatively the 620L will run with two separate 4mm-wall tubes although some
channel-to-channel variance and minimal pulsation may be experienced. For sepa-
rate tube fitting or twin tube inlet to single tube outlet fitting tube clamping blocks
must be used. See 33.8 620L pumphead spares.
33.1 620L and 620LG
key safety information
Ensure that the pump is isolated from mains voltage.
Ensure that there is no pressure in the pipeline.
If a tube failure has occurred, ensure that any product in the pumphead has
been allowed to drain.
Ensure that protective clothing and eye protection are worn if hazardous
products are being pumped.
33.2 620L and 620LG Guarding
Primary safety on 620 series pumps is provided by the tool-lockable pumphead
guard—in the case of the 620L and 620LG heads, the tool-lockable pumphead
track functions as the guard. Secondary (backup) protection is provided in the
form of an electrical guard switch which stops the pump if either end of the
track is opened. The electrical guard switch on cased pumps should never be
used as primary protection. Always disconnect the mains power supply to the
pump before opening the pumphead.
Before opening the pumphead guard please
ensure that the following safety directions are
followed.