1220 Infinity II LC System User Manual 27
Site Requirements and Specifications
2
Performance Specifications
Specification Conditions
ASTM: “Standard Practice for Variable Wavelength Photometric Detectors
Used in Liquid Chromatography”.
VWD
Drift and noise: Standard flow cell, path length 10 mm, flow 1 mL/min
LC-grade methanol, TC 2 s.
RT = 2.2 * TC
Linearity: Standard flow cell, path length 10 mm, measured with caffeine at
273 nm.
DAD
Drift and noise: Standard flow cell, path length 10 mm, flow 1 mL/min
LC-grade methanol, TC 2 s. Measurements were performed at 254 nm or
750 nm with bandwidths of 4 nm (reference wavelengths 360 nm and 850 nm
with bandwidths of 100 nm). Slit width 4 nm.
RT = 2.2 * TC
Linearity: Standard flow cell, path length 10 mm, measured with caffeine at
273 nm and a bandwidth of 4 nm.
ASTM drift tests require a temperature change below 2 °C/h (3.6 °F/h) over
one hour period. Our published drift specification is based on these
conditions. Larger ambient temperature changes will result in larger drift.
Better drift performance depends on better control of the temperature
fluctuations. To realize the highest performance, minimize the frequency and
the amplitude of the temperature changes to below 1 °C/h
(1.8 °F/h).Turbulences around one minute or less can be ignored.
Performance tests should be done with a completely warmed up optical unit (>
two hours). ASTM measurements require that the detector should be turned
on at least 24 hours before start of testing.
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