SSI America 90-2581 REV B manual Wetted Pump Materials, Self-FlushingPump Head

Flow adjustment in 0.01 ml increments, from 0.01 to 10.00 ml/min with a precision of 0.2% RSD (10mL/min heads)

•Microprocessor advanced control

•Digital stepper motor design to prevent flow rate drift over time and temperature

•Back panel RS232 serial communications port for complete control and status monitoring

•Remote analog inputs (e.g. voltage) to control flow rate

1.1.2 Wetted Pump Materials

Pump heads, check valve bodies, and tubing are made out Stainless Steel or PEEK™. Other materials are synthetic ruby and sapphire (check valve internals and piston).

1.1.3 Self-Flushing Pump Head

Self-flushing pump heads provide continuous washing of the piston surface without the inconvenience of a manual flush or gravity feed arrangement. The self-flushing pump head uses a diaphragm and secondary set of check valves to create a continuous and positive flow in the area behind the high pressure pump seal. The flushing solution washes away any buffer salts that have precipitated onto the piston. If not removed, these precipitates can abrade the high pressure seal and cause premature seal failure, leakage, and can possibly damage the pump.

SAPPHIRE

PISTON

MOBILE

PHASE

FLOW OF

FLUSH SOLUTION

PISTON MOVEMENT

PRIMARY HIGH-PRESSURE SEAL

SECONDARY SELF-FLUSH SEAL

Figure 1-1. Self-Flushing Pump Head

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