SFT-20 Supercritical Fluid Pump

Leadership Features:

• Pressures up to 10,000 psi (68.9 MPa)
• Flow Rate 5.0 – 250 ml/min
• Stainless Steel Fluid Path
• Peltier Cooled Pre Chiller/Pump Heads
• Prime Purge Valve Pressure Transducer in “T” Fitting
• Constant Pressure/Flow Modes
• Selectable Pressure or Flow Rate
• RS-232 Serial Communications Port

Click Here to download a printable version of the SFT-20 spec sheet in PDF format.

The SFT-20 is a robust, high precision carbon dioxide pump designed to deliver liquid CO2 up to 10,000 psi (68.9 MPa). Capable of flow rates up to 250 ml/min, the SFT-20 is ideally suited for prep scale supercritical fluid extraction (SFE) and chromatography (SFC) applications. It is easily interfaced to new and existing SFE equipment, including SFT’s model 2000 SFE. It provides the capability to perform supercritical fluid reaction chemistry (SFR) when used to deliver carbon dioxide to one of SFT’s HPR Series™ high pressure chemical reactors.

The SFT-20 incorporates a high performance, dual-headed, positive displacement (piston) pump that rapidly produces the pressures required for supercritical fluid and other high pressure applications. Software safeguards protect from accidental over pressurization. The pressure set point is controlled from a push button display located on the control module’s front panel.

The SFT-20 utilizes dual aluminum pump heads, Furon seals and sapphire pistons. The cam-driven pump mechanism employs a single servo motor drive, dual ball and seat check valves (ruby ball, sapphire seat). SFT-20 has a stainless steel fluid path, prime-purge valve and a pressure transducer in a “T” fitting. The pump’s constant pressure mode features a selectable pressure set point. The flow rate automatically adjusts to maintain a set pressure. An optional “constant flow” mode is available.

Pump head temperature is controlled by an integrated thermoelectric cooling module with finned heat sinks, pre-cooler and a fan. Cooling jackets and baths are not required. A quick-release mechanism allows easy access to pump heads for routine maintenance. Pressure transducer, filters, digital keypad and RS-232 serial interface are standard.


Pump Features:
• Autoprime™ one button toggles flow rate to maximum.
• Check valves allow reliable flow rates down to 0 psi.
• Inlet & outlet bulkhead filters.
• Aluminum pump heads in 12 ml/min size.
• Hex tee/Pressure transducer which adds no volume to the system.
• Front panel flow adjustment in 0.01 ml/min increments.
• Optional user-settable upper and lower pressure limits.
The pump is automatically stopped if the pressure drops below the preset lower pressure limit (the lower pressure limit is enabled after 50 pump strokes) or if the pressure exceeds the upper pressure limit.
• Microprocessor advanced control.
• Chemical-resistant keypad.
• Chemical-resistant LED digital display shows flow rate and pressure limits.
• Digital servo motor design prevents flow rate drift over time and temperature which is a common problem found in analog designs.
Back Panel Inputs: Run/stop inputs (5 volt TTL type), 0 to 10 volt flow rate control input, 0 to 10 KHz flow rate control input, RS-232 serial communications port for complete control and status monitoring.
Back Panel Output: Normally open and normally closed relay contacts (SPDT, form C, 0.25 amp max, 50 volt max) indicate when a pressure fault or motor stall fault occurs.

Pulsation: : +/- 1% at 12 ml/min using 100% Methanol at 1,000 psi.


Standard Configuration:
Flow Rates: 5.0 to 250.0 ml/min (10,000 psi up to 200 ml/min).
Pressure: 0 to 10,000 psi (68.9 MPa).
Pressure Accuracy: - 0 psi + 10 psi.
Pressure Zero Offset: - 0 psi + 10 psi.
Flow Accuracy: +/- 2% using 100% Methanol at 1,000 psi +/- 5% using CO2 (Based on gas volume measurements and back calculation to liquid).
Flow Precision: 0.5% RSD using 100% Methanol at 1,000 psi.
Dimensions: 10” high x 18” wide x 22” deep (25 x 46 x 56 cm).
Weight: 60 lbs (27 kg).

System Requirements
Power Requirements: 115/220 VAC., 50/60 Hz, single phase, 15 amps.
Gas Supply: Liquid CO2 cylinder with dip tube.