Test Procedures
Page 24 of 60
M1393R0
OQ/PQ Operating Instructions
4.2
Lamp Intensity of the UV Detector
The intensity of the UV lamp must be sufficient for correct detection sensitivity and
baseline stability. If the lamp intensity is below the acceptance criteria, baseline instability
problems may occur. For more information refer to the UltiMate service manual.
The absolute intensity of the lamp is not measured in this test, and deviations from lamp to
lamp and from detector to detector are quite normal. The basic function of this test is to
ensure that the output of the lamp is within an acceptable range.
4.2.1
Performing the Lamp Intensity Test
The lamp intensity values are presented in the SIGNAL screen of the SETUP menu.
To check the lamp intensity:
a)
Set the wavelength to 240 nm.
b)
Install the dummy cell and access the SIGNAL screen on the SETUP menu.
FIGURE 4-1
UV Detector SIGNAL Screen
c)
Monitor the signal value (‘sig’) and the reference value (‘ref’). Both the signal and the
reference values should be in the limits defined in TABLE 2-3.
d)
Fill in the appropriate field in the ‘Other Tests’ page of the QO/PQ report.
Note: If the values are not within the specifications, install a new lamp and perform the
test again. If the values are still not within the specifications check/adjust the ‘Integration
Time’ setting.
Note: This test must also be performed for any UV Detector that used for the OQ/PQ,
even if it’s not part of the UltiMate system.
SIGNAL:
sig: 0.3485
♦
absorbtion
ref: 0.1729
