Description

Sage Model 355 Extended range, continuously variable syringe pump.

Model 355 infuses fluids at continuously variable flow rates.  The pump has a range multiplier switch that allows flow to be varied from 1.4 ml/day ( with a 10 ml syringe ) to 140 ml/min ( with a 100 ml syringe ).  For multichannel pumping, the Model 355 holds any two syringes up to 50 ml, or three up to 30 ml.

A front-panel flow-rate chart gives maximum ( 100% ) and minimum ( 4% ) rates obtainable with any of eight syringes.  A ten-turn dial ( %FLOW), calibrated to read out in percentage of maximum flow, permits easy setting of any desired rate within the range.  A range selector switch (RANGE) can be used to reduce rates by factors of 10, 100 or 1000.  Rates are set with just two controls.

After a filled syringe is placed in the holder, the carriage can be manually advaced to reach the syringe piston at the start of a run.  At the end of the run, a safety slip clutch stops the carriage, which may then be repositioned and reset.  If desired, an end-point adjustment control at the rear of the carriage permits stopping of infusion before a syringe empties.

Cosmetics on these are not great, but they work fine.