Agilent InfinityLab LC Series Diode Array Detectors User Manual
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Site Requirements and Specifications
Performance Specifications
Specification Conditions
ASTM: “Standard Practice for Variable Wavelength Photometric Detectors Used
in Liquid Chromatography”.
Reference conditions:
•
Wavelength: 230 nm/4 nm with Reference Wavelength 360 nm/100 nm,
Slitwidth 4 nm, TC 2 s, (or with RT = 2.2 * TC), ASTM
•
Max-Light Cartridge Cell ( 10 mm, V(σ) 1.0 µL) (G4212-60008) with flow of
0.5 mL/min LC grade water or Max-Light Cartridge Test Cell (G4212-60011)
Linearity:
Linearity is measured with caffeine at 265 nm/4 nm with slit width 4 nm and
TC 1 s (or with RT 2 s) with Max-Light Cartridge Cell ( 10 mm, V(σ) 1.0 µL)
(G4212-60008) > 2.0 AU (5 %) [ typical 2.5 AU (5 %) ] .
ASTM drift tests require a temperature change below 2 °C/hour (3.6 F/hour) 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/hour (1.8 F/hour).
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 h before start of testing.
Time Constant versus Response Time
According to ASTM E1657-98 „Standard Practice of Testing Variable-Wavelength
Photometric Detectors Used in Liquid Chromatography” the time constant is
converted to response time by multiplying by the factor 2.2.
NOTE
The specifications are based on the standard RFID tag lamp (5190-0917) and
may be not achieved when other lamp types or aged lamps are used.
