Analytical Sales and Services, Inc.

The 9725 is inert. It applies to both HPLC and soft gel chromatography. It is also suitable for ion chromatography, since metal does not contact the mobile phase. This injector is identical to the model 7725 stainless steel injector, but the materials are different: The loop, nuts, ferrules, stator, and vent lines are made of PEEK™, polyetheretherketone; the rotor seal polymer is Tefzel®. You can avoid exposing sample to a metal syringe by suction loading using the suction needle adapter listed below.

The operating pH range is 0 to 14. The injector is set for its maximum pressure capability, 5000 psi (345 bar, 34 Mpa). However, useable pressure may be lower, since it is usually limited by the burst pressure of the PEEK™ sample loop. Maximum temperature is 50°C. A 20µL loop is attached. Accessory loops from 5µL to 5mL are below; syringes are on page 3~13 & 3~14.

These Two injectors are for preparative HPLC with columns from 1 to 10 cm diameter. They have the ease of use and versatility of Analytical Sales’ analytical-scale models, plus the suitability for large sample volumes and high flow rates. Connections are for 1/8-inch O.D. tubing; a port adapter (optional accessory) connects 1/16-inch O.D. tubing. You can inject volumes from 100µL to 20mL. A 10mL loop is supplied; available accessory loops are 2-, 5-, and 20-mL. 1-mm diameter passages allow flow rates from 10 to 800 mL/min.

Loading is rapid and without strain because the large diameters of the loop, valve passages, and syringe needle have a low resistance to flow. Both models have a version with built-in position switch. All models are shipped with fittings for all ports. Rheflex® PEEK™ fittings must be used with the PEEK™ model.

PEEK™ models are set for 3000 psi (207 bar, 21MPa), adjustable to 4000 psi. Stainless steel models are set for 4000 psi, adjustable to 5000 psi. Maximum temperature for all models is 50°C. Accessory loops, syringes, and replacement parts can also be found on the list to the right.

The versitile two position six port switching valves are available in different sizes and materials. A number of models are available to accept either 1/16” or 1/8” fittings. These valves redirect flow among columns during the chromatographic run. Applications using these valves include trace enrichment, sample clean up, and coupled column analysis. These valves are also useful for selection between two columns.

Compare Model 7000 to the Three-Way Switching Valve (Model 7030) in which each end of the off-line column is independently sealed instead of connected together head-to-tail. Independant seals produce less shock to the column if the valve switches before all the pressure leaves the column.

Model 9010 PEEK™ Sample Injector can convert to a six-port switching valve functionally identical to Model 7000 by removing the loop.

The Model 7040 is a four-port, two-position Stainless Steel valve. The passages are identical to the 7000, but the external loop converts the functionally.

The 7040 with the external loop exchanges the flow pattern from ports (2-3 and 4-6) to (2-6 and 4-3). This flow pattern facilitates applications such as alternating column regeneration and column backflushing. Maximum pressure rating of 7,000.

This Six-Position Switching Valve makes HPLC analyses easier and faster and are available in either Stainless Steel or PEEK™. Two manually operated, six-position valves allow convenient selection among six columns for different analytical methods on the same chromatograph.

There are several advantages achieved from using the valves instead of manually changing the columns: there is immediate selection, there is no wear on the fittings from repeated tightening, and the valve seals both ends of the off-line columns and keeps them on stand-by for future, immediate use.

For manual column selection, the center port of one valve connects to an injector. Turning the valve handle directs flow into one of up to six columns connected to the valve’s six peripheral ports. A second six-position valve connects to the column outlets to select the operating column effluent and to direct it to the detector.

The sixth port may be used for a bypass/flush-out tube. This connection permits rapid mobile phase changeover without exposing any column to a mobile phase other than the one with which it is routinely used.