Agilent Technologies 1290 Infinity II 2D-LC User Manual

2 Concepts of 2D-LC
Active Solvent Modulation (ASM)
2D-LC User Guide 44
Comprehensive 2D-LC and Active Solvent
Modulation
The ASM Valve can also be used for improving comprehensive 2D-LC
measurements, but it is primarily optimized for multiple heart-cutting and
high-resolution sampling measurements.
The ASM phase contributes to the modulation cycle. Keeping the modulation
time constant, reduces the available time for the separation phase of the cycle.
Otherwise, increasing the modulation time may require reducing the
1
D flow rate
to fill the same sample loop volume. This would change
1
D chromatography.
The ASM solution requires backpressure from capillaries between the 2D-LC
Valve to Multiple Heart-Cutting Valves. Therefore, comprehensive 2D-LC sample
loops cannot be installed directly at the ASM valve. In addition, comprehensive
2D-LC sample loops have standard fittings, which do not fit to the M4 ports of the
ASM valve.
Please note that ASM valves require twice as many switches as a standard
2D-LC Valve. Comprehensive 2D-LC switches the valve often and is therefore not
recommended with ASM.

Agilent Technologies 1290 Infinity II 2D-LC Specifications

General

Brand	Agilent Technologies
Model	1290 Infinity II 2D-LC
Category	Measuring Instruments
Language	English