Specifications

6
Solvent Delivery Units
LC-20AD
Superior Solvent Delivery Performance
The LC-20AD offers the fastest solvent delivery performance in the world. With an
automatic pulsation-correction mechanism and high-speed micro plunger driving,
it achieves pulse-free solvent delivery. Thanks to improvements in solvent-delivery
control firmware, solvent-delivery performance in the micro-flow-rate range below
50 µL/min has been significantly improved.
LC-20AB
Binary Solvent Delivery Unit
The LC-20AB is a binary, high-pressure gradient solvent delivery unit that
incorporates two sets of LC-20AD systems. Its space-saving design can be used to
create a two-solvent high-pressure gradient.
LC-20AT
Superior Maintainability
The LC-20AT possesses a high level of maintainability while delivering high
performance. The ability to remove bubbles has been improved by modifying the
pump-head structure and the flow line.
Low-Pressure Gradient Unit
By harmonizing two solvent delivery systems, the LC-20AB delivers
solvent with an accurate concentration across a wide range from
the micro flow rate region to the conventional flow rate region.
Accurate Gradient Solvent Delivery
The flow rate accuracy and precision in the micro flow rate region
have been improved thanks to the adoption of a new type of check
valve and modifications to the solvent-delivery control method.
Nonpolar organic solvents, such as hexane, can be delivered stably.
Measured value,
n=6 (mL/min)
0.010
0.050
0.201
1.000
Set value
(mL/min)
0.010
0.050
0.200
1.000
Flow-Rate Accuracy Flow-Rate Precision
Flow-rate
reproducibility,
n=6 (RSD%)
0.49
0.08
0.08
0.01
Set value
(mL/min)
0.010
0.050
0.200
1.000
3 mg 20 mg 300 mg 2 g
Semi-micro Analysis
Semi-preparative Preparative
2 mmI.D. 5 mmI.D. 20 mmI.D. 50 mmI.D.
0.001 0.01 0.1 1 10 100
10 mL/min
20 mL/min
The optional low-pressure gradient unit can be incorporated in the
LC-20AD/20AT, enabling gradient elution in a compact space with
a small void volume. Automatic matching adjustment of the
solenoid valve and pump gives concentration accuracies of ±1.0%.
Plunger supported by floating mechanism
A new type of plunger made with a technique that reflects
consideration of the material structure and a precise
plunger-holding mechanism help to increase the service life of
plunger seals and enable stable solvent delivery over long periods.
Plunger seal and center in alignment
mAU
500
400
300
200
100
0
Set value
(%)
10
20
30
40
50
60
70
80
90
Measured
value (%)
9.98
20.05
30.09
40.03
50.03
60.02
70.01
80.00
90.05
Continued Improvements to
Solvent Delivery Specifications