Teledyne M5000B operating instructions Oscilloscope Display of the I to E Converter Output

Page 94

5 Maintenance

Model 5000B Photometric Analyzer

 

 

 

 

 

 

 

 

 

If you open the detector module, keep stray light out by covering the opening with a dense black cloth. If you do not take this precaution, the result is a misinterpretation of the scope patterns. On general-purpose systems, the scope test points are in the bottom of the detector module and are accessible withoutopeningthemodule.

5.5.4 Oscilloscope Display of the I to E Converter Output

The output of the I to E Converter is observed at the output of the second amplifier. The objective of this operation is to set up the optical system and the gain of the second amplifier in such a way that the analyzer keeps operating within its dynamic range.

Connect the oscilloscope to TP3. The oscilloscope displays the measur- ing and reference pulses in an alternating pattern. The display is created by the light passing through the reference and measuring filters as they are brought in and out of the light beam by the rotating filter wheel. These light pulses are converted to electronic energy which is amplified and brought to TP2. The base line represents the blocking of the light beam by the opaque part of the filter wheel.

To identify which of the pulses is the measuring peak, insert the span filter (when present) or a piece of flat glass or clear plastic in the light beam. The peak that becomes the shortest (retracts excessively) is the measuring filter pulse.

In case you cannot set the gain properly, because the peaks are too short, too tall, or too much out of balance, adjust R2 trimpot on the converter PC board until you obtain the desired peak height as observed on the scope (usually 8 to 9 volt) for the tallest of the two peaks. Never leave the system operating with peaks exceeding 10 volts or you may saturate the logarithmic amplifier. You should not permit oscillations or distortions in the peaks.

5.5.5Balancing the Optics for Equal Light Transmission with Zero Fluid in the SAMPLE CELL

The objective of this procedure is to obtain measuring and reference peak heights as displayed on the oscilloscope that are approximately equal, with the tallest peaks set at 8 to 9 volts. This must be done with air or zero fluid in the cell.

5-4: Part II

Teledyne Analytical Instruments

Image 94
Contents Photometric Analyzer Teledyne Analytical InstrumentsModel 5000B Copyright 1999 Teledyne Analytical InstrumentsTable of Contents IiiModel 5000B Teledyne Analytical Instruments Part I Part I Control UnitIi Part InstallationOperation Maintenance Iv Part Model 5000B Photometric AnalyzerTypical Applications OverviewPhotometric Analyzer Part I Control Unit Introduction Model 5000B Other NIR Absorbers that can be measured consult factory Introduction Model 5000B Main Features of the Analyzer ESCAPE/ENTER Switch 1 UP/DOWN SwitchOperator Interface Model 5000B Controls, Indicators, and Connectors Control Section Interface Panel Model 5000B Interface Panel Introduction Model 5000B Installation Unpacking the Control/Analysis UnitPart Primary Input Power Connections 115VACExamples Analog Output ConnectionsAlarm Relays Range Voltage Current mATypes of Relay Contacts The connectors are Part I RS-232 Signals RS-232 Sig RS-232 Pin PurposeCommand Description Testing the SystemParameter Setting Part Operation Photometric Analyzer Operation /Control UnitOperation/Control Unit Hierarchy of System Functions and Subfunctions Setting up an AUTO-CAL System FunctionSelect More and press the Enter Key PasswordProtection Entering the PasswordInstalling or Changing the Password Logging Out System Self-Diagnostic Test Model Screen CheckingLinearitywithALGORITHMDigital Filter Setup Setting 90% Response time secondsFilter or Solenoid Setup Hold/Track Setup Calibration/Hold Timer SetupCalbrt hold 3 min Sample hold 1 min Analog 4 to 20 mA Output CalibrationUse UP/DOWN arrow to Adjust 4 ma 250 ModelShow Negative Auto Mode ZeroingZero Cal Manual Mode Zeroing Cell Failure SccmManual Mode Spanning Auto Mode SpanningSpan Cal How to access the offset function Offset FunctionSelect zero mode Auto Select zero mode MAN Zero off 0.0 ppm ENT to begin ZeroAlarms Function AL1 1ØØØ ppm HI DftN FsN LtchN Range Select Function Manual Select/Define Range ScreenAuto Screen Precautions 2illustratestheseschemesgraphically Analyze Function Set Range Screen Algorithm Application More Curve Algorithm Screen Auto Mode Linearization Fuse Replacement Part I Control Unit/Analysis Unit MaintenancePower System Self Diagnostic TestMaintenance Model 5000B Photometric Analyzer AnalogPreamp Cell detectorPart Part II Part II Analysis UnitRoutine Maintenance Part II Analysis Unit Appendix Iv Part Operations/Analysis Unit Control Functions Explosion-ProofVersionControlModulePreliminaryInspection Control SettingsStart-p Analyzers not equipped with Auto ZeroPower On Observations Pre-Start-upElectricalCheckoutTeledyneAnalyticalInstruments4-5 Calibration ProcedureStandardizationFluids TeledyneAnalyticalInstruments4-7 Operations/Analysis Unit TeledyneAnalyticalInstruments4-9 Operations/Analysis Unit TeledyneAnalyticalInstruments4-11 Operations/Analysis Unit TeledyneAnalyticalInstruments4-13 Ppm simulated water using Span Zero SampleAttachment 5000B/5020 NIR Analyzer Operations/Analysis Unit Operational Theory Contd Source Module OpticalSystem Sample cellAnalyzerSystem-BlockDiagram Power Module Block Diagram Detectorcompartment System Visual Check and Response Procedure Routine MaintenancePart II Maintenance/Analysis Unit Automatic operation and routine operational dutiesSuggested Preventive Maintenance Schedule DailyEquipment Required Oscilloscope Display of the I to E Converter Output Part II Maintenance/Analysis Unit Setup of the Logarithmic Amplifier Inverting AmplifierBattery-Powered Oscilloscope Synchronization Point Interface Board Terminals StripPart Part II Maintenance/Analysis Unit Part Operating Temperature 0-50oC SpecificationsPhotometric Analyzer, 5000B Appendix Appendix Models 5000B Other Features Recommended 2-Year Spare Parts List QtyP/NDescriptionDrawing List, 5000B Appendix Models 5000B Teledyne Analytical Instruments