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Unpacking Instructions Notes n4
Unpacking Instructions Remove the Packing List and verify that you have received all equipment, including the following (quantities in parentheses): • OS530/OS520 Series Handheld Infrared Thermometer (1) • AA Size Lithium Batteries (4) • Soft Cover Carrying Case (1) • Analog Cable (1) • RS232 Cable (only for OS533, OS534, OS523, OS524) • CD Software (only for OS533, OS534, OS523, OS524) • Quick Start Manual (1) • User’s Guide (1) Accessories Model No.
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OS530/OS520 Series Handheld Infrared Thermometer TABLE TABLE OF OF CONTENTS CONTENTS Page Unpacking Instructions Chapter 1 General Description . . . . . . . . . . . . . . . . . . . . . 1.1 Introduction 1.2 Parts of the Thermometer 1.2.1 Front of the Thermometer 1.2.2 Rear of the Thermometer Chapter 2 Using the Handheld Infrared Thermometer . . . . 2.1 How to Power the Thermometer 2.1.1 Battery Operation 2.1.2 ac Power Operation 2.2 Operating the Thermometer 2.2.1 Measurement Techniques 2.
TABLE OF CONTENTS Appendix A Appendix B Appendix C Index . . . . iv How Infrared Thermometry Works . . . . Emissivity Values . . . . . . . . . . . . . . . . . . Determining an Unknown Emissivity . . . ................................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 . B-1 . C-1 .
General Description 1 1.1 Introduction The OS530/OS520 series Handheld Infrared (IR) Thermometers provide non-contact temperature measurements up to 4500°F. They offer effective solutions for many non-contact temperature applications, including the following: • Predictive Maintenance: Tracking temperature shifts which indicate pending failure in solenoid valves. • Energy Auditing: Locating wall insulation voids to reduce building heating costs.
1 General Description The thermometer is easy to use: • Units have standard “V” groove aiming sights. • Integral tripod mount permits hands-free operation, if necessary. • Temperature readings are switchable from °F to °C via the keypad. • Parameters, such as target material emissivity and alarm setpoints, can be set and remain in memory until reset. This instrument has a rugged and functional design, including: • Sealed keypad display. • Convenient trigger operation.
General Description Features Accuracy* Range OS530L ±1% rdg -18 to 538°C 0 to 1000°F Emissivity Adjustable Display Resolution 1°F or 1°C Backlit Dual std Display Field of view 10:1 Differential Temperature std Min/Max Temperature std Average Temperature std High Alarm std Low Alarm --Audible Buzzer & Indicator std Ambient Target Temp --Compensation Analog Output 1 mV/Deg RS232 Output --Data Storage --Built-in Laser Dot/Circle sighting Trigger Lock std Last Temperature Recall std Thermocouple Input --- 1
1 General Description Features Accuracy Range Emissivity Backlit Dual Display Distance to Spot Size Ratio Differential Temperature Min/Max Temperature Average Temperature High Alarm Low Alarm Audible Alarm & Indicator Ambient Target Temperature Compensation Analog Output RS-232 Output Thermocouple Input Data Storage Built-in Laser Sighting Trigger Lock Last Temperature Recall OS523** ±1%rdg 0 to 2500°F (-18 to 1371°C) adjustable standard varies** standard standard standard standard standard standard OS5
General Description 1 1.2 Parts of the Thermometer 1.2.1 Front of the Thermometer °F Figure 1-1. OS530/OS520 Series Handheld Infrared Thermometer Front View The display is shown in more detail in Figure 1-2 and described in Table 1-2. There are no user-serviceable parts in the thermometer. Refer to Chapter 3 for Laser Sight information.
1 General Description 2 1 3 LCK ATC 10 HAL LOBAT LAL PRN °F °C 4 5 9 6 8 7 Figure 1-2. Display and Keypad View Table 1-2.
General Description 1 1.2.2 Rear of the Thermometer Figure 1-3 shows the various jacks that are used to connect a recorder or the ac adapter to the thermometer. The figure also shows the location of the tripod thread mount used for fixed point monitoring. More details are provided in Section 2.2.1. Laser Dot/Circle Switch Laser Beam Aperture Figure 1-3.
1 General Description Notes 1-8
Using the Handheld Infrared Thermometer 2 2.1 How to Power the Thermometer 2.1.1 Battery Operation Invert the thermometer and install 4 fresh AA size batteries as shown in Figure 2-1. Make sure the batteries’ polarities are correct, the batteries are not put in backwards, and are of the same type. NOTE If the icon flashes, the batteries must be replaced with fresh batteries immediately. Figure 2-1. Installing the Batteries 2.1.
2 Using the Handheld Infrared Thermometer 2.2 Operating the Thermometer 1a. (Without the Laser Sighting) -Aim the thermometer at the target to be measured. Use the “V” groove (shown in Figure 1-1) on top of the thermometer to align the target to the thermometer’s field of view. Look down the “V” groove with one eye only, in order to guarantee proper sighting. Pull and hold the trigger. 1b. (With the Laser Sighting) - Set the laser power switch to the ON position. Aim at the target and pull the trigger.
2 SPOT DIA. * (CM) SPOT DIA. * (IN) Using the Handheld Infrared Thermometer Figure 2-4. Field of View OS531, OS532, OS530L DISTANCE: SENSOR TO OBJECT (FT) SPOT DIA.* (IN) 0** 20" 2' 1' 3' 4' 5' 6' 7' 4.2" 8' 4.8" 3.6" 1.0" @ 0" to 20" 3.0" 2.4" 1.0" 1.0" 1.8" 1.2" D:S = 20:1 2.5 SPOT DIA.* (CM) 4.0 6.0 8.0 2.5cm @ 51cm 10.0 *SPOT DIAMETER MEASURED AT 90% ENERGY 40 80 120 12.
2 Using the Handheld Infrared Thermometer Figure 2-6 Field of View OS534, OS523-1 SPOT DIA.* (IN) DISTANCE: SENSOR LENS TO OBJECT (in.) 0 3" 6" 9" 15" 12" 1.17" 0.9" .45" .39" .15" .78" SPOT DIA.* (MM) D:S = 40:1 22 11.5 3.9 9.9 19.9 29.9 *SPOT DIAMETER MEASURED AT 90% ENERGY 0 7.6 15.2 22.9 30.5 38.1 DISTANCE: SENSOR LENS TO OBJECT (cm.
Using the Handheld Infrared Thermometer 2 SPOT DIA.* (IN) DISTANCE: SENSOR TO OBJECT (FT) 3' 0' 5' 10' 16' 2.9" 1.9" 0.9"@ 0 1.2" 1.0" 0.9" D:S = 60:1 SPOT DIA.* (MM) 26 31 22mm @ 0 48 *SPOT DIAMETER MEASURED AT 90% ENERGY 0 1.0 1.5 75 3.0 5.0 DISTANCE: SENSOR TO OBJECT (M) Figure 2-8 Field of View OS523-2 SPOT DIA.* (MM) SPOT DIA.* (IN) DISTANCE: SENSOR TO OBJECT (FT) 0’ 3’ 2’ 5’ .35"@ 24" 10’ 4.0" .8" .9" 21 22 16’ 7.0" 1.6" 42 101 181 3.0 5.
2 Using the Handheld Infrared Thermometer SPOT DIA.* (IN) DISTANCE: SENSOR TO OBJECT (FT) 0' 16' 50' 82' 0.5"@ 0 8.7" 5.1" 1.5" 0.9" D:S = 110:1 SPOT DIA.* (MM) 38 130 221 15 25 13mm @ 0 *SPOT DIAMETER MEASURED AT 90% ENERGY 0 5 DISTANCE: SENSOR TO OBJECT (M) Figure 2-10 Field of View OS524 3. The target temperature and emissivity are displayed on the LCD. Determine the emissivity of the target (refer to Appendix B). Press the key to increment the target emissivity.
Using the Handheld Infrared Thermometer 2 2.2.1 Measurement Techniques You can use the IR Thermometer to collect temperature data in any one of five different ways: • Spot Measurement — Measures the temperature of discrete objects such as motor bearings, engine exhaust manifolds, etc.: 1. Aim at the desired target and pull the trigger. 2. 3. If necessary, adjust the emissivity using the keys. Read the temperature.
2 Using the Handheld Infrared Thermometer NOTE Center hole is the analog output jack Analog Cable To Strip Chart Recorder Figure 2-11 Recorder Hookup • Moving Surface Scan - Measures the Temperature of Points on a Moving Surface: 1. Mount the thermometer on a camera tripod and aim at a fixed point on the moving surface. 2. Pull the trigger and press the key to lock the trigger. 3. If necessary, adjust the emissivity. The thermometer is now set up for measuring the temperature of a moving surface. 4.
Using the Handheld Infrared Thermometer 2 2.3 Real Time Mode (Active Operation) Definition: Real Time Mode is the active operational mode of the thermometer. In this mode, the thermometer constantly measures and displays temperature. Figure 2-12. General Operational Block Diagram NOTE If the trigger is pulled two times in rapid sequence, it may reset the emissivity, high alarm, low alarm and target ambient temperature to the default values.
2-10 OS531 & OS532 OS530L, OS530HR OS534, OS523, OS524 OS533 Go to Go to Go to Go to Go to or Go to Go to or Go to Go to Last temperature Differential temperature Last temperature Average temperature Last temperature Thermocouple temperature Last temperature High alarm setpoint Last temperature Low alarm setpoint Last temperature Ambient target temperature Last temperature Last/stored temperature Memory location Go to Last temperature Maximum temperature Last temperature Minimum temperature G
Using the Handheld Infrared Thermometer MODE DISPLAY LCK LCK DISPLAY 2 MODE LCK LAL ☞ LCK LCK ATC * ☞ ☞ LCK LCK * ☞ PRN ☞ ☞ (Model OS533) LCK * LCK ☞ ☞ LCK * ☞ LCK * ☞ LCK HAL ☞ (Model OS531, OS532 OS530L, OS530HR) Figure 2-13. Visual Function Flow Chart * While in these 5 modes: Use key to change temperature from °F to °C or vice versa. Use key to turn on the display backlighting.
2 Using the Handheld Infrared Thermometer 2.3.1 Adjusting Emissivity Refer to Appendices B and C for information on emissivity. 1. Determine the emissivity of the target. °F 2. Aim at the target and pull the trigger. 3. If necessary, press the key to increment the target emissivity or press the key to decrement the target emissivity. NOTE The Emissivity Display Mode (E) appears every time the trigger is pulled regardless of how the Display Mode was previously set.
Using the Handheld Infrared Thermometer 2 2.3.3 Calculating Temperature Values The thermometer calculates the MAX, MIN, dIF, and AVG temperatures based on the current temperature. °F °F °F is the maximum temperature since the temperature measurement session starts (pulling the trigger). °F °F is the minimum temperature since the temperature measurement session starts. is the difference between the MAX and MIN temperatures.
2 Using the Handheld Infrared Thermometer 2.3.6 Thermocouple Input (OS532, OS533, OS534) The thermometer accepts thermocouple input. It displays thermocouple temperature and the target temperature (via infrared) simultaneously. This function provides an accurate method of determining an unknown emissivity. LCK °F • To Determine an unknown target emissivity 1. Connect a contact thermocouple probe (Type K) to the thermometer as shown in Figure 1-3. 2.
Using the Handheld Infrared Thermometer 2 2.3.7 Using the Alarm Functions The thermometer provides audible and visible alarm indications. • To set the high alarm value: °F HAL 1. Pull the trigger. Then press and hold the key until the High Alarm Display Mode (HAL) appears. 2. Press the the 3. key to increment the high alarm value. Press key to decrement the high alarm value. Press the key to enable the high alarm function. The icon appears.
2 Using the Handheld Infrared Thermometer • To set the low alarm value: (OS533, OS534, OS523, OS524): 1. LAL °F Pull the trigger. Then press and hold the key until the Low Alarm Display Mode (LAL) appears. 2. Press the the 3. key to increment the low alarm value. Press key to decrement the low alarm value. Press the key to enable the low alarm function. The icon appears. If the temperature drops below the low alarm setpoint, you will hear a beep and the icon on the display flashes. 4.
Using the Handheld Infrared Thermometer 2 2.3.8 Using Ambient Target Temperature Compensation (OS533, OS534, OS523, OS524) ATC °F Use the Ambient Target Temperature Compensation (AMB) Display Mode when high accuracy readings under both of these conditions are required: • The target has a low emissivity. • The ambient temperature around the target is much higher than the ambient temperature around the infrared thermometer. To set and activate the Ambient Target Temperature Compensation Mode: 1.
2 Using the Handheld Infrared Thermometer 8. ATC °F Press and hold the key until the Emissivity Display Mode (E) appears. 9. Change the emissivity to the proper value for the target being measured (refer to Section 2.3.1). 10. Aim at the target. The target temperature and emissivity are displayed on the LCD. 11.
Using the Handheld Infrared Thermometer 2 PRN °F NOTE Bottom hole is the RS-232 jack Serial Printer RS-232 Digital Cable 25-pin 'D' Connector 6-pin Phone Jack To the Printer To the Thermometer Figure 2-14. Serial Printer Hookup 3. Pull the trigger and press the trigger. The 4. key to lock the icon will appear on the display. Press and hold the until the Print Data display Mode (PRN) appears. 5. Press the key to increment the printing interval.
2 Using the Handheld Infrared Thermometer 7. PRN °F After all data is taken, press the the. 8. key again and icon disappears. Press and hold the until the Emissivity display Mode (E) appears. 9. Press the key to unlock the trigger. 2.3.10 Sending Temperature Data to a Personal Computer (OS533, OS534, OS523, OS524) PRN °F The thermometer can transmit temperature data to a Personal Computer via the RS-232 phone jack and the RS-232 cable.
Using the Handheld Infrared Thermometer Operating System: Processor : Ram: Monitor: Video Card: CommPort: CD-ROM: Hard Drive: 2 Win95, Win98, Win NT 4.0, Windows 2000 Pentium Class (Any speed) 32 Mega-Bytes VGA, Or Higher Resolution Supports VGA, 256 Color, 800 x 600 Resolution (Minimum) 4800 Baud, 8 Databits, 1 Stop, No Parity. Any Speed 10 Mega-Bytes Available Space (For Installation Only) How to Install IR_TEMPSOFT Please follow this installation procedure to install IR_TEMPSOFT: 1.
2 Using the Handheld Infrared Thermometer program please contact technical support at Omega Engineering Inc. Connecting the IR-System to the PC Make certain that your Infrared Thermometer is powered down before you attempt to make any connections to the personal computer. Making connections between powered devices and a powered PC can cause damage to communications ports, or other electronic circuitry in your device or computer. 1.
Using the Handheld Infrared Thermometer 2 waiting for the thermometer to transmit data through your RS-232 port. 4. Begin transmitting data from the thermometer by pressing and holding the key on the thermometer until the Print Data Display Mode (PRN) appears. 5. Press the "UP" key to increment the printing interval. Press the "Down" key to decrement the printing interval. The printing interval (from 1 to 1999) is the time between data points. The default value is 2 seconds. 6.
2 Using the Handheld Infrared Thermometer 2.3.11 Storing the Temperature Data on Command (OS534, OS523, OS524) °F The thermometer can store up to 100 temperature data points on command. Each set of temperature data is broken down into the temperature value, emissivity, and high alarm setpoint for that temperature. This data is stored in non-volatile memory, so removing the batteries will not affect this data. To store temperature data: 1.
Using the Handheld Infrared Thermometer 2 2.3.12 Erasing the Temperature Data from Memory The user can erase all 100 temperature data points in memory at any time by using the following procedure: 1. Pull the trigger and press the key. The icon will appear. 2. Press the and keys in rapid sequence. NOTE icon disappeared, repeat steps If the 1 and 2 The display freezes momentarily, and a beep sounds for about 1 second. Now the memory is cleared. The thermometer reverts to real time mode.
2 Using the Handheld Infrared Thermometer 2.4 Recall Mode (Passive Operation) Definition: Recall Mode is the passive operational mode of the thermometer. In this mode, you may review the most recently stored temperature data and parameters. Pull Trigger Start Sleep Mode Display Turns Off Immediately (Release Trigger) (Table 2-1) Press Display Turns Off in Approx. 10 Seconds Real Time Mode (Active) (No keys pressed) Recall Mode (Table 2-2) (Passive) Figure 2-16.
OS531 & OS532 OS530L, OS530HR OS534, OS523, OS524 OS533 Go to Go to Go to Go to Go to or Go to Go to or Go to Go to Last temperature Differential temperature Last temperature Average temperature Last temperature Thermocouple temperature Last temperature High alarm setpoint Last temperature Low alarm setpoint Last temperature Ambient target temperature Last temperature Last/stored temperature Memory location Go to Last temperature Maximum temperature Last temperature Minimum temperature Go to
2 Using the Handheld Infrared Thermometer 2.4.1 Reviewing the Last Parameters The thermometer stores the last temperature measured in °F the real time mode (refer to Table 2-1). This temperature can be recalled by pressing the - Press the key. key to review the most recently stored temperature data and parameters.
Using the Handheld Infrared Thermometer 3. PRN °F 4. 5. 6. 7. 2 To download stored temperature data points from the thermometer, first make certain that it is not in printing mode. Make sure that the IR_TEMPSOFT is installed properly as explained in section 2.3.10. On the main menu bar, click on “Command-> Download Stored Data”. The “Stored Data” window will appear. The “Stored Data Points” window will appear. Click on the “START RECEIVING” button to bring the program into receive mode.
2 Using the Handheld Infrared Thermometer 2.6.3 Reviewing Previously Stored Temperature Data (OS534, OS523, OS524) You can review all 100 stored temperature values on the thermometer display using the following procedure: °F 1. Press and hold the key until you see the Memory Display Mode (MEM) appear. 2. Press the key to increment the memory location or press the key to decrement the memory location. The memory location can be from 001 to 100. 3. Press the key.
Laser Sighting 3 3.1 Warnings and Cautions CAUTION You may receive harmful laser radiation exposure if you do not adhere to the warnings listed below: • USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HERE MAY RESULT IN HAZARDOUS RADIATION EXPOSURE. • DO NOT LOOK AT THE LASER BEAM COMING OUT OF THE LENS OR VIEW DIRECTLY WITH OPTICAL INSTRUMENTS - EYE DAMAGE CAN RESULT. • USE EXTREME CAUTION WHEN OPERATING THE LASER SIGHTING.
3 Laser Sighting 3.2 Description The Laser Sighting is built into the thermometer. It provides a visual indication of the field of view of the thermometer. Aiming at distant targets (up to 40 feet) becomes much easier by using the Laser Sighting. It is offered in two different models, laser dot, and laser dot/circle switchable.
Laser Sighting 3 3.3 Operating the Laser Sighting 1. Set the laser power switch to the ON position as shown in Figure 3-2. 2. Aim at the target and pull the trigger. 3. The laser beam and the red power indicator LED will turn on. Refer to Figure 3-1 and Figure 3-2. The laser beam will stay on as long as the trigger is pulled. If the trigger is locked (the key is previously pressed) or released, the laser beam will turn off. In order to turn on the Laser Sighting again, pull the trigger again. 4.
3 Laser Sighting NOTE The Laser Sighting turns on only when used with the thermometer. The module does not turn on by itself. The line of sight of the thermometer does not coincide with that of the Laser Sighting, as shown in Figure 3-4. The two lines of sight become less critical when measuring distant targets. For example, at 30 feet from the target and a 3 foot diameter target size, there is a 2.7% offset error with respect to the target size.
Sighting Scope 4 4.1 Sighting Scope The Sighting scope is an accessory for the thermometer. It provides a visual indication of the target being measured. Aiming at distant targets (up to 200 feet) becomes much easier by using the Sighting scope. 4.2 Installing and Operating the Sighting Scope 1. If the sighting scope is already installed on the thermometer, go onto step 5. 2. The sighting scope comes with a pair of mounting clamps already attached. 3.
4 Sighting Scope Pair of Mounting Clamps Line of sight of the sighting scope 1 11/16 (42.8 mm) Line of sight of the thermometer Figure 4-1.
Maintenance 5 5.1 Replacing the Batteries NOTE When you change the batteries, all of the set parameters (i.e. emissivity, high alarm, low alarm, Target Ambient Temperature) will be reset to the default values. For your convenience, you may want to write down all of the set parameters BEFORE replacing the batteries. The thermometer is powered by 4 standard AA size lithium batteries. To replace the batteries: 1. Invert the thermometer and open the cover of the battery compartment. 2.
5 Maintenance 5.2 Cleaning the Lens Although all lenses are quite durable, take care to prevent scratching when cleaning them. To clean the lens: 1. Blow off loose particles, using clean air. 2. Gently brush off remaining particles, using a camel hair brush. Alternatively, clean any remaining contaminants with a damp, soft, clean cloth. Be careful not to rub too hard. CAUTION Do not use any ammonia or cleaners with ammonia on the lens, as damage may result.
6 Troubleshooting Guide THERMOMETER Problem Solution The thermometer does 1a. Properly install fresh batteries. not turn on (No Display) 1b. If operating under ac power, check that the ac adapter is plugged in properly to the ac wall outlet and to the thermometer. 1c. Make sure the batteries make good contact - remove and reinstall the batteries. 2. Make sure that the trigger is pulled completely. 1. Reset the thermometer.
6 Troubleshooting Guide Problem Solution The thermometer is “locked up” (the display is “frozen”). Remove and reinstall the batteries or disconnect and reconnect the ac adapter. The display is either erratic or stays at one reading. 1. Clean the thermometer lens. Refer to Section 4.2. 2. Activate the Diagnostic Program in the thermometer as follows: a. Pull the trigger and press the key to lock the trigger. b. Hold down the press the key and key until “VER X.X” is displayed.
Troubleshooting Guide Problem 6 Solution If you see an error code, either “ERR1”, “ERR2”, or “ERR3”, record the code and call our Customer Service Department. Provide Customer Service with the error code that is displayed in the upper left corner of the display. The Customer Service Department representative may ask you to return the thermometer to the factory. • The display will go back to the Real Time Mode (Emissivity Display Mode). c.
6 Troubleshooting Guide Problem The thermometer resets itself unexpectedly. The emissivity has been reset to .95. All other parameters are reset to the default values. Solution The trigger is pulled two times in rapid sequence. Wait at least 2 seconds between two successive trigger pulls. You may need to set the emissivity, low alarm, high alarm, target ambient temperature values again. Laser Sighting Problem No Laser Beam The Laser "line of sight" does not coincide with the center of the target.
Specifications 7 (Specifications are for all models except where noted) THERMOMETER Measuring: Temperature Range: OS530HR, -22°F to 250°F (-30°C to 121°C) OS531: 0°F to 750°F (–18°C to 400°C) OS530L, OS533,OS532: 0°F to 1000°F (–18°C to 538°C) OS534 0°F to 1600°F (–18°C to 871°C) OS523 0°F to 2500°F (–18°C to 1371°C) OS524 1000°F to 4500°F (538°C to 2482°C) Accuracy (24°C or 75°F OS531: ±2% of reading or Ambient Temperature and at 3°F whichever is greater emissivity of 0.
7 Specifications Average Temperature Accuracy Time Period (under continuous operation): 111⁄2 days Emissivity: 0.10 to 1.00 in 0.
Specifications Analog Output Accuracy: ±2mV reference to temperature display Power: 4 AA size 1.
7 Specifications LASER SIGHTING Wavelength (Color): Operating Distance: Laser Dot Laser Circle Max. Output Optical Power: 630-670 nanometers (red) 2 to 40 ft. 2 to 15 ft. <1mW at 75°F ambient temperature, Class II Laser Product European Classification: Class 2, EN60825-1 Maximum Operating Current: 25mA at 5.
Glossary of Key Strokes Key(s) 8 Key(s) Functions • Selects one of the following Display Modes: E , MAX, MIN, dIF, AVG, TC, HAL, LAL, AMB, PRN or MEM. • • • • Locks/unlocks the trigger. Enables/disables High Alarm. Enables/disables Target Ambient Temperature Compensation. Enables/disables sending data to the personal computer or serial printer. Stores temperature data on command. • Displays previously stored data. • • Increments the data or value displayed.
8 Glossary of Key Strokes Notes 8-2
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.
A Appendix: How Infrared Thermometry Works Blackbody When thermal radiation falls on an object, part of the energy is transmitted through the object, part is reflected and part is absorbed. A blackbody is defined as an ideal object that absorbs all the radiation incident upon it. The best example of a real object that acts like a blackbody is a small hole drilled deep into a large opaque cavity.
Appendix: How Infrared Thermometry Works A Wien’s Displacement Law describes the exact mathematical relationship between the temperature of a blackbody and the wavelength of the maximum intensity radiation. λm = 2.898 T where λm = wavelength measured in microns T = temperature in Kelvin Calculating Temperature The net thermal power radiated by an object has been shown to depend on its emissivity, its temperature and that of the ambient temperature around the object.
A Appendix: How Infrared Thermometry Works Optics Field of View Accurate measurement of temperature via infrared means depends strongly on the size of the object and the distance between the thermometer and the object. All optical devices (e.g. cameras, microscopes, infrared thermometers) have an angle of vision, known as a field of view or FOV, within which they see all objects. In particular, the thermometer will measure a fixed proportion of the energy radiated by all objects within its FOV.
Appendix: Emissivity Values B Table B-1 provides guidelines for estimating the emissivity of various common materials. Actual emissivity, especially of metals, can vary greatly depending upon surface finish, oxidation, or the presence of contaminants. Also, emissivity or infrared radiation for some materials varies with wavelength and temperature. To determine the exact emissivities for most applications, follow the procedures in Appendix C. Table B-1.
B Appendix: Emissivity Values Material Emissivity (ε) Asbestos Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.96 Asphalt, tar, pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.95 – 1.00 Brick – red and rough . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.93 Brick – fireclay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.75 NONMETALS Carbon – filament . . . .
Appendix: Determining an Unknown Emissivity C In Appendix A, we showed how emissivity is an important parameter in calculating the temperature of an object via infrared means. In this section we discuss how to determine a specific emissivity value. If you know the material of the object, use Table B1 in Appendix B to look up its approximate emissivity. Most organic materials such as plastics, cloth, or wood have an emissivity of about 0.95. For this reason, we use 0.
C Appendix: Determining an Unknown Emissivity Method 3 1. Use this method to measure objects at temperatures below 500°F (260°C). 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.
Appendix - Determining an Unknown Emissivity C Method 4 1. Paint a sample of the object material with flat black lacquer paint. 2. Set the emissivity to 0.97 and measure and record the temperature of the painted portion of the sample material - Area ‘A’ in Figure C-1. Make sure that the painted area of object material fills the FOV of the thermometer. 3. Aim the thermometer at another spot on the target - Area ‘B’ in Figure C-1. 4.
C Appendix: Determining an Unknown Emissivity Notes C-4
Index I A D ac Adapter Input Jack ............. 1-6 Active Operation ...................... 2-8 Aiming Sight “V Groove” ....... 1-4 Alarms ........................... 2-14, 2-15 Alkaline Batteries ...... 2-1, 4-1, 6-3 Ambient Target Temperature Compensation ...................... 2-16 Analog Output Jack ................. 1-6 Diagnostic Program ................. 5-2 Differential Measurement ...... 2-6 Display Icons: ATC ........................ 1-5 Backlighting .......... 1-5 HAL .......................
I Index F K Field of View: Diagrams ....................... 2-3, 2-4 Positions ................................ 2-2 Fixed Point Monitoring over Time Measurement ................ 2-7 Keypad, 4-position .................. 1-4 Keys: ▼ & °F-°C ....................... 1-4, 1-5 FUNC (Function) .......... 1-4, 1-5 LOCK (Lock) ................. 1-4, 1-5 ▲ & ❍-●......................... 1-4, 1-5 Key Strokes ............................... 7-1 G Gray Bodies (Objects) .............
Index I M S Main Display ............................ 1-4 Modes: Real Time .............................. 2-8 Recall ........................ 2-23, 2-25 Moving Surface Scan ............... 2-7 Serial Printer Hookup ........... 2-18 Sleep Mode ....................... 2-5, 2-8, .............2-12, 2-28, 5-1 Spectral Distribution .............. A-2 Spot Measurement ................... 2-6 Static Surface Scan ................... 2-6 Stefan-Boltzmann Law ........... A-3 Storing Temperature Data ....
WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 25 months from date of purchase on the base unit and 13 months from date of purchase on Laser Sight Module. OMEGA WARRANTY adds an additional one (1) month grace period to the normal product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product.
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