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Omega Engineering OS531, OS530HR Thermal Radiation, Appendix How Infrared Thermometry Works A

Models: OS524

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Appendix: How Infrared Thermometry Works A

Appendix: How Infrared Thermometry Works A

Thermal Radiation

Heat is transferred from all objects via radiation in the form of electromagnetic waves or by conduction or convection. All objects having a temperature greater than absolute zero (-459°F, -273°C, 0 K) radiate energy. The thermal energy radiated by an object increases as the object gets hotter. Measurement of this thermal energy allows an infrared thermometer to calculate the object’s temperature if the emissivity (blackness) is known. Generally, it is convenient to measure the amount of radiated energy in the infrared part of an object’s radiation spectrum.

Figure A-1 shows a block diagram of an infrared radiation thermometer. Energy from the object is focused by the lens onto the detector. As the detector heats up, it sends out an electrical signal, which in turn is amplified and sent to the circuitry of the thermometer. The thermometer software then calculates the temperature of the object.

LENS

OBJECT

AMPLIFIER

DETECTOR

THERMOMETER CIRCUITRY AND DISPLAY

OR

SIGNAL OUTPUT TO SERIAL PRINTER

OR PERSONAL COMPUTER

Figure A-1. Infrared Thermometer Block Diagram

A-1

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Omega Engineering OS531, OS530HR, OS53X-CF, OS524, OS533, OS532 Thermal Radiation, Appendix How Infrared Thermometry Works A

Contents

User’s Guide OS531, OS532, OS53x-CF OS533, OS534, OS530L, OS530HROS523, OS524 OMEGASCOPE Handheld Infrared Thermometer Shop online atOMEGAnet Online Service omega.com Internet e-mail info@omega.comServicing North America For immediate technical or application assistanceUnpacking Instructions Accessories Model NoDescription e-mail info@omega.comPage CONTENTS OS530/OS520 SeriesHandheld Infrared Thermometer TABLE OFTABLE OF CONTENTS General Description 1.1 IntroductionThe thermometer is easy to use Display Resolution General DescriptionFeatures OS523OS524 OS523 provides three field of views1.2.1 Front of the Thermometer 1.2 Parts of the ThermometerGeneral Description Table 1-2. Display Details 1 General DescriptionFigure 1-3. OS530 Series Handheld Infrared Thermometer Rear View 1.2.2 Rear of the ThermometerGeneral Description 1 General Description Using the Handheld Infrared Thermometer 2.1 How to Power the Thermometer2.1.1 Battery Operation 2.1.2 ac Power Operation2.2 Operating the Thermometer Using the Handheld Infrared Thermometer Measurement distance is from the outside surface of the rubber bootFigure 2-4. Field of View OS531, OS532, OS530L Figure 2-5 Field of View OS533, OS530HR2 Using the Handheld Infrared Thermometer Figure 2-6 Field of View OS534, OS523-1Figure 2-7 Field of View OS53x-CF DISTANCE SENSOR LENS TO OBJECT inUsing the Handheld Infrared Thermometer Figure 2-8 Field of View OS523-2Figure 2-9 Field of View OS523-3 SPOT3. The target temperature and emissivity are displayed on the LCD 2.2.1 Measurement Techniques 2. Pull the trigger and press the key to lock the trigger Figure 2-12. General Operational Block Diagram 2.3 Real Time Mode Active OperationUsing the Handheld Infrared Thermometer Using Recall ModeHandheld Infrared Thermometer Figure 2-13. Visual Function Flow Chart Usekey to change temperature from F to C or vice versaUsing the Handheld Infrared Thermometer MODE DISPLAY2.3.1 Adjusting Emissivity 2.3.2 Using the LOCK FunctionRefer to Appendices B and C for information on emissivity This function electronically locks the trigger mechanism2.3.3 Calculating Temperature Values 2.3.4 Changing the Temperature from F to C or vice versa2.3.5 Turning on the Display Backlighting Every time the thermometer goes from the sleep mode to the2.3.6 Thermocouple Input OS532, OS533, OS534 To Determine an unknown target emissivity2.3.7 Using the Alarm Functions The thermometer provides audible and visible alarm indicationsTo set the high alarm value If the temperature exceeds the high alarm setpointIf the temperature drops below the low alarm To set the low alarm value OS533, OS534, OS523, OS524setpoint, you will hear a beep and the icon on the display flashes To set and activate the Ambient Target Temperature Compensation Mode The target has a low emissivity8. Press and hold the key until the Emissivity Display Mode E appears 3. Pull the trigger and press the key to lock the System Requirements 8. Press and hold the until the Emissivity display Mode E appears7. After all data is taken, press the key again and the. icon disappearsPlease follow this installation procedure to install IRTEMPSOFT program please contact technical support at Omega Engineering Inc waiting for the thermometer to transmit data through your RS-232 port 2.3.11 Storing the Temperature Data on Command OS534, OS523, OS524 1. Pull the trigger and press the key. The icon will appear 2.4 Recall Mode Passive Operation Mode ActiveRecall Mode Figure 2-16. General Operational Block DiagramTable 2-2. Functional Flow Chart Recall Mode Recall ModeDisplay stored 2.4.1 Reviewing the Last Parameters 5. The “Stored Data Points” window will appear 2. Press the key to increment the memory location or 3.1 Warnings and Cautions Laser SightingRefer to the inside back cover for product warning label 3.2 Description 3.3 Operating the Laser Sighting The visibility of the laser beam depends on the ambient light levelsFigure 3-4 Lines of Sight of the Laser Sighting and Thermometer 4.2 Installing and Operating the Sighting Scope Sighting Scope 4.1 Sighting ScopeFigure 4-1. Installing the Sighting Scope 4 Sighting ScopePair of Mounting Clamps 1 11/16 42.8 mmMaintenance 5.1 Replacing the Batteries Safety Warning5.2 Cleaning the Lens 5.3 Calibrating the Thermometer5.4 Servicing the Laser Sighting 1. Blow off loose particles, using clean airProblem Troubleshooting GuideSolution Problem The thermometer isProblem SolutionThe temperature reading is Troubleshooting GuideProblem SolutionProblem SolutionTHERMOMETER SpecificationsSpecifications are for all models except where noted 7 Specifications Specifications With LCD backlighting andLASER SIGHTING Complies with 21 CFR Chapter 1, Subchapter JGlossary of Key Strokes 8 Glossary of Key Strokes Thermal Radiation Appendix How Infrared Thermometry Works ASpectral Distribution BlackbodyA Appendix How Infrared Thermometry Works Calculating Temperature λ m = TOptics Field of View Figure A-3. Field of View of a ThermometerMETALS Appendix Emissivity ValuesMaterial Emissivity εNONMETALS MaterialEmissivity ε Appendix Emissivity ValuesMethod Appendix Determining an Unknown EmissivityMethod 1. Use this method to measure objects at temperatures below 500F 260C MethodMethod MethodFigure C-2. Determining Emissivity with a Drilled Hole Appendix - Determining an Unknown Emissivity CC Appendix Determining an Unknown Emissivity Index Page Page RETURN REQUESTS / INQUIRIES WARRANTY/DISCLAIMERCAUTION OMEGASCOPE TEMPERATURE PRESSURE, STRAIN AND FORCEFLOW/LEVEL pH/CONDUCTIVITY