English 
Dutch 
French 
Dual Piston Pump for low pulsation requirements
The ReaXus® LD Class features dual-headed, positive displacement piston pumps designed for chromatography applications, including analytical, flash, and small-scale preparative workflows. These pumps are ideal to deliver precise flow rates with exceptionally low pulsation, meeting the high accuracy requirements of HPLC and other high-performance separations.
Performance and capabilities
The LD Class is available in three flow rate configurations:
- 12 mL/min
- 36 mL/min
- 100 mL/min
These pumps can reach pressures up to 6,000 psi, providing the power needed for both high- and low-pressure gradients. The high-performance linear cams combined with automatic pressure compensation ensure precise, stable flow.
Fluid paths and materials
Standard fluid path materials include stainless steel and PEEK, with optional Hastelloy for corrosive or specialized applications. Jacketed pump heads are available for temperature-controlled processes, enabling precise management of sample conditions.
Key advantages
The LD Class dual piston mechanism, advanced cam technology, and patented low dead-volume Pulse Dampener provide:
- Minimal pulsation for high-precision chromatography
- Stable and accurate flow over a wide operating range
- Reliable performance for both analytical and preparative tasks
- RS-232 and Micro USB connectivity
- Run/Stop functionality
- Analog control (0–10 V, 4–20 mA)
- Full PC monitoring and status reporting
| Flow Rate Range and Max. Pressure Ratings* | 0.0-12.000 mL/min (6,000 psi)
0.0-36.000 mL/min (6,000 psi) 0.0-100.0 mL/min (1,500 psi) |
| Pulsation** | ≤2% @ 1 mL/min and 80:20 Water/IPA; 1,000 psi (12 mL)
≤1.0% @ 4 mL/min and 80:20 Water/IPA; 1,000 psi (36 mL) ≤2.0% @ 50 mL/min and 80:20 Water/IPA; 250 ps (100 mL) |
| Pressure Accuracy | ±50 psi |
| Flow Reproducibility | 0.5% RSD (1.000 – 12.000 mL/min; 80:20 Water/IPA; 1,000 psi) (12 mL)
0.5% RSD (1.00 – 36.00 mL/min; 80:20 Water/IPA; 1,000 psi) (36 mL) 0.5% RSD (1.0 – 100.0 mL/min; 80:20 Water/IPA; 500 psi) (100 mL) |
| Flow Rate Accuracy | ±2% (1.000 – 12.000 mL/min; 80:20 Water/IPA; 1,000 psi) (12 mL)
±2% (2.00 – 32.00 mL/min; 80:20 Water/IPA; 1,000 psi) (36 mL) ±2% (0.5 – 100.0 mL/min; 80:20 Water/IPA; 500 psi) (100 mL) |
| Wetted Materials | PEEK pumps may include: PEEK, Synthetic Ruby, Sapphire, Zirconia, UHMWPE, FFKM, PFA, ETFE
Stainless Steel pumps may include: 316 Stainless Steel, PEEK, Synthetic Ruby, Sapphire, Zirconia, UHMWPE, PFA, PTFE, ETFE Hastelloy pumps may include: Hastelloy C-276, Synthetic Ruby, Sapphire, Zirconia, UHMWPE, FFKM, PFA, PTFE, ETFE |
| Dimensions | 6.4″ H x 9.9″ W x 17.5″ D
(16.3 x 25.1 x 44.5 cm) |
| Weight | 21.4 lbs. (9.7 kg) |
| Power | 100-240 Vac (±10%), 50-60 Hz |
| Control | RS-232, Micro USB, Run/Stop, Analog (0-10V, 4-20mA) |
| *Flow Rate is dependent on solvent selection and operating pressure.
**Pulsation value with pulse dampener. |
|
Not sure which pump fits your needs?
Compare models here!
| ReaXus Class | Key differences |
|---|---|
| M1 Class | Compact design focused on affordability while maintaining high precision and performance |
| MX Class | Economical design with eccentric drive and shaped cam mechanism |
| LS Class | Advanced cam design providing very low pulsation for improved flow stability |
| LD Class | Dual‑headed pump for high versatility in analytical, flash, and small‑scale preparative chromatography |
| PR Class | Dual‑headed, rugged construction optimized for high flow accuracy and excellent pressure capability across varied applications |
