4-24 | IPS-4 Dual Bench (UV / IR) Analyzer
Manually Starting a Neutral Density Filter Verification
The neutral density filter (NDF) is an optical diagnostics tool that can be
used to check the response and alignment of the IPS-4’s UV Optical Bench
pathway. This user-initiated feature provides additional diagnostics and
preventive diagnostics on the UV Optical Bench, which can help avoid
timely and costly repairs. The filter verification, which can only be started
manually, only needs to be performed if the process readings are outside
the expected values, or if “
Failed Calibration
” is displayed on the UIP.
When the filter verification routine is initiated, the NDF is inserted into
the optical path. The optical intensity response is compared against a fac-
tory generated
Reference
. The peak areas should remain relatively constant
and only generate an error if they rise above or fall below the factory-
defined tolerance.
Next, the physical alignment of the Optical Bench will be confirmed. Even
though the Xenon lamp output will decrease over time, the emission
peaks’ relative positions should remain the same because the wavelength
mapping is independent of the lamp’s age. If the peak positions are not
within the factory specification, the analyzer will display a “
Failed Cali-
bration
” message on the UIP to alert you that there is an issue with the
wavelength positioning on the diode array. Further diagnostics is then
required to determine the exact cause. Review the “Neutral Density Filter
Verification Diagnostic Chart.“ In some cases, the analyzer Optical Bench
may need to be returned to the factory for service.
To initiate a filter verification:
1. From the
SETUP
menu, select
Calibration Control
and press
Enter
.
Select
Calibration Actions
and press
Enter
, then scroll down and se-
lect
Start Filter Verification
. Press
Enter
to start the verification (Figure
4-18a). After the filter verification routine has been started, you can
view the
Display Filter Verification
screen (Figure 4-18b).
2. The analyzer will perform the Zero read. The length of this period is
dependent on the factory-set number of measurements to be averaged
during the Zero read.
3. The analyzer then performs a two-fold optical diagnostic routine.
First, the wavelength mapping is verified. Next, the filter is moved
into position by a rotary solenoid. The length of time the filter remains
in the activated position is factory set (1 minute). The
Reference
value
is factory set, based on the provided filter, and should not be adjusted.
The filter absorbance is measured at four wavelengths.
Figure 4-18a.
Calibration Actions
screen.
Manual Zero Calibration
Manual Span Calibration
►
Start Filter Verification
HOME ALARMS STATUS SETUP
Summary of Contents for Western Research IPS-4
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Page 218: ...A 2 IPS 4 Dual Bench UV IR Analyzer Analyzer Light Path UV Optical Bench Schematic...
Page 219: ...Appendix A Drawings A 3 Analyzer Light Path NDIR Optical Bench Schematic CONDENSING...
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Page 223: ...Appendix A Drawings A 7 Display Interface Board 100 2049...
Page 225: ...Appendix A Drawings A 9 AC Disconnection Board 100 2077...
Page 227: ...Appendix A Drawings A 11 Relay Board 100 2050...
Page 228: ...A 12 IPS 4 Dual Bench UV IR Analyzer Analog Board 100 2047...
Page 229: ...Appendix A Drawings A 13 MCU Board 100 2045...
Page 230: ...A 14 IPS 4 Dual Bench UV IR Analyzer Xenon Lamp Power Supply Board 100 2061 UV Optical Bench...
Page 231: ...Appendix A Drawings A 15 Infrared Source Assembly Interface Board 100 2838 IR Optical Bench...
Page 232: ...A 16 IPS 4 Dual Bench UV IR Analyzer Electronics Enclosure Wiring Diagram Sheet 1 of 5...
Page 233: ...Appendix A Drawings A 17 Electronics Enclosure Wiring Diagram Sheet 2 of 5...
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Page 235: ...Appendix A Drawings A 19 Disconnect Enclosure Wiring Diagram Sheet 4 of 5...
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