36 Agilent 1260 Infinity DAD and MWD 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: cell path length 10 mm, wavelength 254 and 750 nm
with reference wavelength 360 nm/100 nm, slit width 4 nm, time constant 2 s
(equal to response time 4 s), flow 1 mL/min LC-grade Methanol.
Linearity: Linearity is measured with caffeine at 265 nm/4 nm with slit width
4 nm and TC 2 s (or with RT 4 s) with 10 mm pathlength.
For environmental conditions refer to "Environment".
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.
The specifications are based on the standard RFID tag lamp (2140-0820) and may be not
achieved when other lamp types or aged lamps are used.
Mobile devices used close to the intstrument could affect the detector's short term noise
level.
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