Omega Engineering OS533E manual Figure C-1. Determining Emissivity

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CAppendix: Determining an Unknown Emissivity

Method 3

1.Use this method to measure objects at temperatures below 260°C (500°F).

2.Place a large piece of masking tape on the object (or at least a sample of the object material). Allow time for the masking tape to reach the object temperature.

3.Set the emissivity of the thermometer to 0.95. Use the thermometer to measure and record the temperature of the masking tape - Area ‘A’ in Figure C-1. Make sure that the area of the object covered with masking tape fills the FOV of the thermometer.

Area 'A'

Target

Area 'B'

Target

Figure C-1. Determining Emissivity

4.Aim the thermometer at Area ‘B’ as shown in Figure C-1 Make sure that Area ‘B’ is as close as possible to Area ‘A’.

5.Adjust the emissivity of the thermometer until the temperature reading equals the temperature found in Step 3.

C-2

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Contents User’sGuide Servicing North America Unpacking Instructions Accessories Page Unpacking Instructions Chapter General Description Chapter Maintenance General Description Introduction OS530LE OS530HRE OS530LE-CF OS533E-CF OS534E-CF Features OS523E OS524E LCD Parts of the Thermometer Front of the ThermometerKey General Description General Description Installing the Batteries Ac Power OperationField of View Positions Operating the ThermometerField of View OS534E, OS523E-1 Field of View OS53xE-CF Field of View OS523E-3 Measurement Techniques 11 Recorder Hookup 12. General Operational Block Diagram Real Time Mode Active OperationReal Time Modes 13. Visual Function Flow Chart Adjusting Emissivity Using the Lock FunctionUsing the Trigger Function Must be hard, flat, and reflective to ultrasonic pulse Using the Distance FunctionDS = 17. Field of View of Distance Meter HH-DM Laser Sighting Status Calculating Temperature ValuesChanging the Temperature from F to C or vice Versa Turning on the Display BacklightingThermocouple Input OS532E, OS533E, OS534E Using the Alarm Functions To set the low alarm value OS533E, OS534E, OS523E, OS524E Use the Ambient Target Temperature Compensation Atcf Operation PC User Application, OS530 Series19. Main Menu 10. Settings Menu Settings Menus21. Typical Temperature Data File Ascii PC Interface CommandsString Description Storing Temperature Data on Command OS534E, OS523E, OS524E Logging Temperature Data in Real Time OS523E, OS524E,OS534E Erasing the Temperature Data from Memory Mode Recall Mode Passive OperationRecall Modes Reviewing the Last Parameters Laser Sighting Right Side View DescriptionOperating the Laser Sighting Two Laser ConfigurationsLines of Sight of the Laser Sighting and Thermometer Sighting Scope Installing and Operating the Sighting ScopeInstalling the Sighting Scope Maintenance Replacing the Batteries Safety WarningCleaning the Lens Calibrating the ThermometerServicing the Laser Sighting Problem Solution Troubleshooting GuideTroubleshooting Guide Problem Troubleshooting Guide Specifications Specifications are for all models except where notedGND With Built-in Distance Module Laser Sighting Distance Measuring Built-in-DM Specifications Glossary of Key Strokes Glossary of Key Strokes Appendix How Infrared Thermometry Works a Thermal RadiationBlackbody Calculating Temperature Optics Field of View Appendix Emissivity Values MetalsNonmetals Appendix Determining an Unknown Emissivity Figure C-1. Determining Emissivity Figure C-2. Determining Emissivity with a Drilled Hole Appendix Determining an Unknown Emissivity Index Field of View Diagrams Recall WARRANTY/DISCLAIMER PH/CONDUCTIVITY Temperature