S 1122 — Isocratic HPLC Pump

The S 1122 is a dual-piston pump built on short-stroke piston technology with only two valves. This combines the reliability of a single-piston pump with the low-pulsation performance of a dual-piston system. Microprocessor-controlled speed regulation and continuous pressure-dependent flow correction deliver exceptional flow constancy across the entire delivery range — independent of back-pressure.

Key Features

  • Short-stroke dual-piston technology — low residual pulsation, just two valves
  • Pressure-compensated delivery volume for precise, back-pressure independent flow
  • Two operating modes: constant flow (analytical) and constant pressure (column packing, special applications)
  • Alphanumeric plain-text display for fast parameter check and change
  • Independent min/max pressure safety limits; pump shuts down on threshold breach to protect the system
  • Compressibility factor adjustable 0.7 (methanol) to 1.0 (aqueous) — optimised for different solvents

Flow Rate

0.02 – 4.00 ml/min

Max Pressure

Up to 400 bar (40 MPa)

Materials

Stainless Steel or PEEK

Compressibility

Adjustable (0.7–1.0)

Run Time

1–999 min

Power Supply

100–250 V AC, 47–63 Hz

Primary Use

Routine analytics — simple operation and rugged construction make the S 1122 the pump of choice for everyday isocratic HPLC work.

Additional Uses

Column packing (constant-pressure mode), quality control, teaching labs, any application where a reliable single-flow isocratic pump is required.