Teledyne 3160 manual Modes of Operation, Spinning Wheel, Cell Output Factor Span Factor

Page 30

4 Operations

displaying the function of each button directly above it. The LCD screen displays the current mode and any warning messages, instructions and button functions.

4.1.1 Spinning Wheel

A “spinning wheel” appears in the upper left-hand corner of the LCD display to indicate that the alarms are enabled (any that are not defeated), or that scheduled zeroing (AutoZeroing) or scheduled spanning (AutoSpanning) may take place. If the spinning wheel does not appear, the alarms are disabled, and a scheduled zero or span is defeated. Note that there is a delay of several minutes before the spinning wheel appears whenever the Analyze mode is re-entered.

4.1.2 Cell Output Factor (Span Factor)

The expected life of the Micro-Fuel Cell sensor is about eight months. A guide to the relative life left in the cell can be found on status page 2 (see System Statistics near the end of this chapter) or retrieved from the serial port through the serial command SF. The span factor ranges from 0.00 to 1.00, with 1.00 representing full life expectancy. A span factor below 0.1 indicates that the Micro-Fuel Cell needs replacing.

4.2Modes of Operation

To use the system and select displayed options, press the button directly underneath the option you wish to select. There are eleven different menus:

Cold Start-Up:During the first startup, and when subsequent cold start- ups are chosen by the user, initial values set at the factory for alarms, I/O, calibration, zeroing and other data are used.

Upon cold start, zeroing and calibration should be performed before

accurate oxygen measurements are obtained. A system warm start is automati- cally performed on each subsequent power-up. For a warm start, previous user-input configuration data is preserved in RAM by battery-preserved memory in the system control module.

Calibration Zeroing: For the highest possible accuracy, the analyzer must be zeroed using an oxygen-free gas. By eliminating normal background “noise” from the sensor reading, zeroing resets the level referred to as the “zero” oxygen concentration.

If the analyzer is equipped with a scrubber, it is important to zero the analyzer with a near-zero gas connected to the sample port. The zeroing process automatically opens pneumatic valves on either side of the scrubber, and a gas with a high concentration of oxygen will react with the scrubber and necessitate replacement sooner.

4-2

TELEDYNE ANALYTICAL INSTRUMENTS

Image 30
Contents Model Copyright 1999 Teledyne Analytical Instruments Iii Table of Contents Maintenance & Troubleshooting AppendixTeledyne Analytical Instruments Variable Features FeaturesFixed Features IntroductionIntroduction Introduction Components Options and Model Numbers3160DA Dual fuel cell Introduction Applications Operational Theory Principles of OperationMajor Components Operational Theory Micro-Fuel Cell Sensor Sample SystemOperational Theory Electronics and Signal Processing Model 3160 flow schematicOperational Theory Analog signal output offset Identifier Range Scale Voltage CurrentmADefaults Programmable Options Front Panel InstallationUnpacking the Analyzer Qty DescriptionRear Panel Analyzer front and rear panels Instrument Air Compressed Air Fitting Installation Gas Line ConnectionsSpan Gas Sample GasSensor Installation Electrical Connections Voltage Selection 3160 Rear PanelFuse Changing Removing the Voltage CardFuse Replacement Installation Checklist 3 RS-232 Serial Digital PortOperations Front Panel ControlsModes of Operation Spinning WheelCell Output Factor Span Factor Operations Changing Passwords For Remote Monitoring and Control Uled Span in ProgressOperations Cold Start-Up Operations Calibration Zeroing Operations Operations Calibration Using Span Gas Operations Operations Operations Select Active Sensor Two Cells Only Setup Operations Operations O2 Range Set-Up AccptOperations Set-Up Alarms Cold StartOperations Operations Logger Set-Up Operations Operations Set-Up Clock Functions Accpt Teledyne Analytical Instruments Operations Operations System Statistics Baud rate Ascii Data Bits 7 or Stop Bits 1 orComm. Std. for 1200B Bell USA/CCITT Operations Operations Sensor Maintenance Maintenance & TroubleshootingRoutine Maintenance Scrubber MaintenanceTroubleshooting Symptom Cause CorrectionMaintenance & Troubleshooting Symptom Cause Correction Maintenance & Troubleshooting Specifications Operating Temperature0-50C 32 -122 FAppendix Altitude 1,609 m Relative Humidy Up to 99% Teledyne Analytical InstrumentsAppendix Recommended Spare Parts List Drawing ListDate Prepared 2/12/96 Appendix Material Safety Data SheetCustomer Service Extension Environmental Health Material or Component S. # QuantitySection IV Fire and Explosion Hazard Data Protective measures during cell replacement ExposureSection Viii Control Measures Address Product NameManufacturer PhoneExposure limits Osha PEL Signs/symptoms of exposurePrimary route of entry Effects of overexposure IngestionProtective measures Disposal