When delivering smaller particles through the liquid mobile phase of a HPLC unit, the liquid must be forced through the column under pressure. The purpose of an HPLC pump, also called a solvent delivery system, is to force the liquid through the system while maintaining a specific flow rate. HPLC pumps can be broadly categorized into three types: syringe pumps that provide pulseless delivery, reciprocating or piston pumps that push the mobile phase through with a series of pistons, and pneumatic pumps that use gas to pressurize the mobile phase. Reciprocating pumps are most common due to their good pressure generation, constant flow rate, and small footprint, but each type of pump has its pros and cons that should be weighed when purchasing. Other things to look out for when selecting a pump include the instrument’s compatibility with different solvents, low dead volume to minimize issues with solvent changeover, delivery method (either isocratic or gradient), as well as things like price, ease of use, and lifetime.
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| Company | Shimadzu | Shimadzu |
| Item | LC-20AP Large-scale Solvent Delivery Unit | LC-40B XR HPLC/UHPLC Pump |
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| Catalog Number | LC-20AP | LC-40B XR |
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| Description | The next generation LC-20AP Preparative LC Pump can be used for analytical, semi-prep and prep LC applications without changing pump heads.
The wide flow rate range (0.01 - 150mL/min) with high pressure tolerance (6,000 psi up to 100mL/min and 4,350 psi up to 150mL/min) makes it possible to use The next generation LC-20AP Preparative LC Pump can be used for analytical, semi-prep and prep LC applications without changing pump heads.
The wide flow rate range (0.01 - 150mL/min) with high pressure tolerance (6,000 psi up to 100mL/min and 4,350 psi up to 150mL/min) makes it possible to use 50mmID x 250mmL 5um-particle size columns to achieve high-resolution and high-efficiency purification, and improve productivity by five to ten times over the previous models. The flow rate accuracy and precision were drastically improved by minimizing dead volume in the pump heads and using higher resolution micro-stepping motor control so that the pump can be used at an analytical flow rate range, such as 1mL/min, with high reliability.
Overall productivity and quality of the purification has also been greatly improved. If configured as an analytical/prep system, a user can develop a method at analytical scale then immediately convert the method for prep scale. Shimadzu provides a tool to easily convert methods between analytical and prep for support customers. In addition, the LC-20AP pump can be used with Open Solution automated prep LC/MS software, which allows researchers to purify their compounds by simplifying the workflow in a walk-up environment.
In addition, the LC-20AP consumes 40% less energy in comparison with the previous model thanks to a newly designed high-efficiency power supply and motor control electronics. This makes the product more ecological.... Read More | Experience our LC-40B XR pump, a binary, high-pressure gradient solvent delivery unit that incorporates two pumps into one compact unit, with no compromises in gradient accuracy or retention time reproducibility. The space-saving design is an ideal choice for binary gradient separations.
Features:Experience our LC-40B XR pump, a binary, high-pressure gradient solvent delivery unit that incorporates two pumps into one compact unit, with no compromises in gradient accuracy or retention time reproducibility. The space-saving design is an ideal choice for binary gradient separations.
Features: - Unique FlowPilot technology ramps up the pump flow gradually, waits for the column to reach its set temperature, then ramps to the set flow rate, reducing potential column damage from pressure shock.
- FlowPilot automatic diagnostic and recovery capabilities allow monitoring of pressure fluctuations for anomalies, restoration of normal operation, and can also alert users of low solvent levels.
- The pump can display total operating time, volume of solvent delivered for each seal, and maintenance, error and operation logs
- Users can set solvent compressibility to further reduce pulsation during operation
- Can be controlled by the LCD front panel keypad, web browser, and various HPLC and LC-MS/MS software.
- External valve option to supply 2 different solvents to each pump.
- Includes a rinse kit to wash behind the seals to minimize salt precipitation if buffered mobile phases are used.
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| Type | Series-Type Double Plunger | Parallel-type double plunger |
| Plunger Capacity | 250 ul | Inquire |
| Flow Rate | 0.01 to 150.0 mL/min | 0.1 uL/min to 10 mL/min |
| Gradient Type | Constant-Pressure Solvent Delivery | High-pressure or quaternary low-pressure |
| Number of Mixed Solvents | Inquire | Inquire |
| Max. Pressure | 42.0 Mpa | 70 Mpa |
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