General Tools IRT105 User Manual [en, es, fr]

6:1 POCKET INFRARED
THERMOMETER
USER’S MANUAL
IRT105
Please read this manual carefully and thoroughly before using this product.
TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . 4
What’s in the Blister Pack . . . . . . . . . . . . . . . . 5
Install Two Batteries . . . . . . . . . . . . . . . . 6 –7
Operating Instructions . . . . . . . . . . . . . . . 7 – 16
Making Basic Measurements . . . . . . . . . 7 –8
Advanced Measurement Modes
and Functions . . . . . . . . . . . . . . . . . . . . 8 – 11
Accounting for Emissivity . . . . . . . . . .11 – 13
Making Accurate Measurements . . . . 14 – 16
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 17
Warranty Information . . . . . . . . . . . . . . . . . . . 18
Return for Repair Policy . . . . . . . . . . . . . . . . 19
Spanish Translation . . . . . . . . . . . . . . . . 20 – 39
French Translation . . . . . . . . . . . . . . . . . 40 – 59
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INTRODUCTION
Thank you for purchasing General Tools & Instruments’ IRT105 6:1 Pocket Infrared Thermometer. Please read this user’s manual carefully and thoroughly before using the instrument.
The IRT105 is a small and lightweight non-contact thermometer that measures the surface temperature of an object from a distance by using an IR sensor to measure its thermal radiation. A laser pointer defines the target area (spot) whose temperature is being measured.
The thermometer has a wide measurement range of -22° to 482°F (-30° to 250°C) and a distance-to-spot ratio of 6:1. These two specifications—as well as its adjustable emissivity and its high basic measurement accuracy (±3°F above 32°F) —make the IRT105 ideally suited for applications in food processing, electrical troubleshooting, and automotive and HVAC equipment maintenance. In applications such as these, an infrared thermometer is the only instrument capable of taking the temperature of a surface that may be impossible to reach or too hot or cold to touch.
The IRT105 comes in a blister pack with two non­rechargeable CR2032 Lithium-ion batteries to power its thermometer and laser pointer.
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KEY FEATURES
• Optimized measurement range
• Basic accuracy of ±3°F
• Adjustable emissivity
• Fast response time
• Min and Max measurement modes + Measurement Lock mode
• Selectable °F or °C unit
• Large LCD
• Separate batteries for thermometer and laser
• Auto power off
• Small and light and easy to use
SAFETY INSTRUCTIONS
CAUTION!
The IRT105’s targeting laser is a Class II type that emits less than 1mW of power between 630nm and 660nm. Avoid direct eye contact with laser light radiation. U.S. law prohibits pointing a laser beam at aircraft; doing so is punishable by a fine of up to $10,000 and imprisonment.
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WHAT’S IN THE BLISTER PACK
The IRT105 comes in a plastic blister pack with two CR2032 batteries, a wrist strap and this user’s manual.
PRODUCT OVERVIEW
Figure 1 shows the locations of the controls, indicators and physical features of the IRT105.
Fig. 1. The IRT105’s controls, indicators and physical features
A. Meas. (measure) button B. Mode button C. Wrist strap attachment bar D. Laser pointer E. IR sensor window F. Liquid-crystal display G. Thermometer battery compartment H. Laser battery compartment
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Figure 2 shows the icons and text that may appear on the display. Familiarize yourself with the locations of these controls and the meanings of these icons before moving on to the setup and operating instructions.
Fig. 2. All possible display indicators and their meanings
A. Low Battery icon B. Laser Enabled icon C. Displaying highest measurement D. Displaying lowest measurement E. Operating in emissivity selection mode F. Operating in measurement lock mode G. Celsius unit selected H. Fahrenheit unit selected
I. Measured value
SETUP INSTRUCTIONS
INSTALL TWO BATTERIES
Two CR2032 batteries (included) must be installed in separate compartments in the back of the IRT105 (callouts G and H of Fig. 1) to activate its thermometer and laser pointer. To open either compartment, place the tips of your thumb and index finger against the bumps on the round compartment cover and turn clockwise. Insert each battery so the writing
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stenciled on it faces you. Then replace both covers and secure them by turning them counterclockwise.
When replacing a battery, you may need to slide the tip of a pin under it to dislodge it. Each compartment is equipped with a pin slot (at the four o’clock) position for that purpose.
OPERATING INSTRUCTIONS
MAKING BASIC MEASUREMENTS
To make a quick measurement with the IRT105, point the front of the unit at a surface, press the Meas. (measure) button, hold it for at least one second, and then release the button. The temperature of the surface will be displayed instantly on the LCD in Celsius or Fahrenheit units. Note that when you release the Meas. (measure) button the reading will be held for 15 seconds and then disappear as the IRT automatically powers off (to extend battery life).
By default, the laser pointer turns on when the Meas. (measure) button is pressed and turns off when the button is released. The laser’s default state is indicated by the presence or absence of the Laser Enabled icon (callout B of Fig. 2).
To change the laser’s default state from on to off, first power off the IRT by pressing and holding the Mode button. Then power on the unit in a special way by pressing and holding the Mode and Meas. buttons at the same time. Note that after doing this the Laser Enabled icon will no longer appear on the top line of the display.
To return the laser’s default state to on, simply press and hold the Meas. button as you would to make a quick measurement. Note that after doing so the Laser Enabled icon will reappear on the top line of the display.
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To temperature-scan the surfaces of a room or any environment, press the Meas. (measure) button and keep pressing it as you point the IRT in various directions. Note that the display tracks the different temperatures of different surfaces in real time.
To power off the IRT105, either press and hold the Mode button or let the auto power off function turn the IRT off after 15 seconds of inactivity.
ADVANCED MEASUREMENT MODES AND FUNCTIONS
The Mode button below the Meas. button is the gateway to the IRT105’s five advanced measurement and selection modes (see Figure 3).
Press 1x to
enter MAX
Measurement
mode
Press 5x
to enter
Emissivity
Selection
mode
Press 4x to enter °C/°F
Selection
mode
Press 2x to
enter MIN
Measurement
mode
Press 3x to
enter
Measurement
Lock mode
Fig. 3. The Mode button provides access to the IRT105’s five advanced measurement and selection modes
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1. MAX Measurement mode—To identify the hottest surface in
an environment, press the Meas. button to power on the IRT. Then (within 15 seconds) press the Mode button once. This will cause the text MAX to appear blinking on the top line of the display. Then press the Meas. (measure) button. This changes MAX from blinking to constant, indicating operation in MAX Measurement mode.
Within 15 seconds, press and hold the Meas. (measure) button and begin to scan surfaces within sight. Note that in MAX mode the display no longer tracks the temperatures of scanned surfaces in real time. Instead, it shows the highest temperature measured since the Meas. (measure) button was pressed. Also note that the maximum temperature is held only for 15 seconds after the Meas. (measure) button is released, causing the IRT to begin counting down to auto power off.
To exit MAX mode and return to real-time temperature scanning, press the Mode button. If the IRT auto powers off while in MAX mode, it will not resume operation in MAX mode when powered on again. It will resume operation in real-time measurement mode.
2. MIN Measurement mode—The flip side of MAX mode, MIN
mode is entered by powering on the IRT105 and pressing the Meas. (measure) button twice. This causes the text MIN to appear blinking on the top line of the display. Pressing the Meas. button changes MIN from blinking to constant, indicating operation in MIN Measurement mode.
In MIN mode, the display shows the lowest temperature measured so far during a scanning session. Like MAX values, MIN values are held for only 15 seconds. To exit MIN mode and return to real-time scanning, press the Mode button.
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3. Measurement Lock mode—Pressing the Mode button three times with the IRT powered on causes the word LOCK to
appear blinking on the top line of the display. Pressing the Meas. (measure) button changes LOCK from blinking to constant, indicating operation in Measurement Lock mode.
In this mode, you need not hold the Meas. (measure) button while scanning. Surface temperatures are measured and displayed in real time, and the IRT’s 15-second auto power off function is disabled. Although Lock mode makes scanning easier, it has a potential downside: the disabling of auto power off. If you forget to exit Lock mode and then leave the IRT105 powered on for a long time, you run the risk of discharging the thermometer battery. So remember to exit Lock mode after using it by pressing the Mode button.
Before entering Measurement Lock mode, you should disable the laser pointer—by powering off the IRT and then powering it back on in a special way by pressing and holding the Meas. and Mode buttons at the same time, as explained earlier. Doing so will prevent accident discharging of the laser’s battery in Lock mode over time with the auto power off function disabled. Disabling the pointer is also a safety precaution. If you were to leave the IRT unattended with the laser on after putting it into Lock mode, a curious child could enter the room and stare directly at the pointer to investigate the source of the unusual light.
4. °C/°F Selection mode—Pressing the Mode button four times with the IRT powered on causes the symbol of the current default temperature unit (°C or °F) on the right side of the display to change from constant to blinking. Pressing the Meas. (measure) button while the term is blinking switches all displayed readings to the other unit until the default unit is changed again.
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5. Emissivity Selection mode—Pressing the Mode button five times with the IRT powered on causes the Greek letter to
appear blinking on the top line of the display. Unlike in other modes, the blinking icon indicates that a new mode has already been entered—in this case, Emissivity Selection mode.
The factory-set default emissivity value of the IRT105 is 0.95. To enter the emissivity value of your target surface material:
• Locate the material in Table 1 in the shaded box,
Accounting for Emissivity.
• Press the Meas. (measure) button as many times as
necessary to change the display from the factory-set default value of 0.95 to the desired value. Note that each press of the button increases the displayed value by 0.01. After five presses, starting at 0.95, the displayed value will be 1.00. The next press will change the value to 0.10—the lowest possible emissivity setting. Each subsequent press of the Meas. (measure) button will increase the value by
0.01 units.
• When you have reached the desired emissivity value, press
the Mode button to store the setting. The IRT105 will use this value in its temperature calculations until you change it.
ACCOUNTING FOR EMISSIVITY
Emissivity is the ability of an object to reflect or absorb IR radiation (energy). Because the IRT105 measures the amount of infrared energy emitted by a surface, the IRT’s measurements are most accurate when they take into account the characteristic emissivity of the target material.
A perfectly absorbent surface (called a black body) has an emissivity (represented by the Greek letter
) of 1; it
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absorbs 100% of the thermal energy hitting it. An object with an emissivity of 0.8 absorbs 80% of IR energy and reflects 20% of it. All emissivity values fall between 0 and 1; as a rule, the shinier the surface, the lower its emissivity. The default emissivity setting of the IRT105 is 0.95.
To maximize the accuracy of IRT105 measurements, you should enter the actual emissivity of the target surface via the front panel buttons and display, as explained on pp. 10 and
11. To do so, first determine the emissivity of the surface whose temperature you wish to measure from Table 1.
Note from the double entries for aluminum, copper, steel and asbestos paper in the table that emissivity is only slightly dependent on temperature. Consequently, you can confidently use the table’s emissivity numbers for your target material even if it is at a different temperature than specified. Compensating for emissivity will particularly improve the accuracy of measurements of surfaces with emissivities nearer to zero than to the default IRT105 setting of 0.95.
Table 1. Emissivities of common materials
Material Temperature (°F/°C) Emissivity Gold (pure, highly polished) 440/227 0.02 Aluminum foil 81/27 0.04 Aluminum disc 81/27 0.18 Aluminum (household, flat) 73/27 0.01 Aluminum (polished plate) 400/227 0.04
1070/577 0.06
Aluminum (rough plate) 78/26 0.06 Aluminum (oxidized) 390/199 0.11
1110/599 0.19
Aluminum surfaced roofing 100/38 0.22 Tin (bright tinned iron sheet) 77/25 0.04
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Nickel wire 368/187 0.10 Lead (99.95% pure, unoxidized) 260/127 0.06 Copper 390/199 0.18
1110/599 0.19
Steel 390/199 0.52
1110/599 0.57
Zinc (galvanized sheet iron, bright) 82/28 0.23 Brass (highly polished) 476/247 0.03 Brass (hard rolled, polished w/lines) 70/21 0.04 Iron galvanized (bright) ——- 0.13 Iron plate 68/20 0.69 Rolled sheet steel 71/21 0.66 Oxidized iron 212/100 0.74 Wrought iron 70/21 0.94 Molten iron 2550-3270/1299-1399 0.29 Copper (polished) 70-242/21-117 0.02 Copper (scraped, shiny, not mirrored) 72/22 0.07 Cooper (plate,
Brick (red, rough) 70/21 0.93 Brick (silica, unglazed rough) 1832/1000 0.80 Concrete ——— 0.94 Glass (smooth) 72/22 0.94 Granite (polished) 70/21 0.85 Marble (light gray, polished) 72/22 0.93 Asbestos board 74/23 0.96 Asbestos paper 100/38 0.93
700/371 0.95
Asphalt (paving) 39/4 0.97
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MAKING ACCURATE MEASUREMENTS
The IRT105 has a distance-to-spot (D:S) ratio of 6:1. This means that the target area (spot) whose infrared radiation (temperature) is being measured increases in diameter by 1 inch for every 6 inches you move away from the target. Conversely, the diameter of the target area measured decreases by 1 inch for every 6 inches you move closer to the target.
All IR thermometers (IRTs), including the IRT105, take the average temperature of all objects within a circular target area (spot). Although the distance “D” in the D:S ratio is defined as a linear value and the “S” defines the diameter of the spot (see Fig. 4), the critical parameter is the target area. Depending on the distance to the target (the object whose temperature you want to measure), the target area may include both the target and background objects near or behind the thermometer’s field of view, which defines the target area or spot.
Fig. 4. The IRT105’s field of view
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To explain the relationship between D:S ratio and measurement accuracy, consider how the IRT105 would be used to measure the temperature of a small AC motor suspected of overheating. The motor measures approximately
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1 ft x 1 ft, so it has an area of 1 ft
. If the IRT105 is used to
make the measurement from 12 ft. away, the reading will
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have a large error. At this distance, the target area is 2 ft
. Therefore, the IRT105 will measure not just the temperature of the motor, but also the temperature of the physical surroundings in its field of view (see Fig. 5, top), and average the two readings.
How inaccurate would the measurement be? If the motor’s operating temperature is 200°F and the background temperature is 75°F, and the motor’s area is half the target area at the measurement distance, the following equation gives the average temperature of the target area:
Tavg = (Tmotor + Tbackground) ÷ 2
Solving for Tavg, we get (200 + 75) ÷ 2 or 137.5°F., which is what the IRT105 would display. In other words, trying to measure the temperature of the motor from 12 ft. away introduced an error of (200-137.5) ÷ 200, or 31% into the measurement. In this case, the measured temperature was 31% below the motor’s actual temperature because the background is cooler than the motor.
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To eliminate measurement error, the IRT must be moved close enough so the motor is the only object in the target area (see
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Fig. 5, bottom). For a motor with an area of 1 ft
and using the IRT105, with a D:S ratio of 6:1, the optimum measurement distance would be 6 ft.
Fig. 5. Measuring a motor’s temperature from the wrong (top) and right (bottom) distance.
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SPECIFICATIONS
Measurement Range -22° to 482°F (-30° to 250°C) Measurement Accuracy ±3°F (2°C) or 2% of reading
(whichever is greater) above 32°F (0°C); ±5°F (3°C) or 2% of reading
(whichever is greater) below 32°F Measurement Repeatability 1% of reading or 1°C Distance-To-Spot (D:S) Ratio 6:1 Emissivity Adjustable from 0.1 to 1 in 0.01
Response Time 500 msec for 95% response Display Type/Size/Resolution LCD/1.0 x 0.8 in.
Laser Class/Power/Wavelength Class II/<1mW/630 to 660nm Response Wavelength 8 to 14 um Auto Power Off After 15 seconds of inactivity Thermometer Battery Life 50 hours, typical Current Consumption <5mA w/laser off Operating Temperature 32° to 104°F
Storage Temperature -4° to 140°F
Dimensions 4.25 x 2.05 x 0.98 in.
Weight 1.41 oz. (40g) Power Source Two CR2032 (3V) non-
increments (factory set to 0.95)
(25 x 19mm)/±0.1°C
(0° to 40°C)@<75% R.H.
(-20° to 60°C)@<85% R.H.
(108 x 52 x 25mm)
rechargeable Lithium-ion cells
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WARRANTY INFORMATION
General Tools & Instruments’ (General’s) IRT105 6:1 Pocket Infrared Thermometer is warranted to the original purchaser to be free from defects in material and workmanship for a period of one year. Subject to certain restrictions, General will repair or replace this instrument if, after examination, the company determines it to be defective in material or workmanship.
This warranty does not apply to damages that General determines to be from an attempted repair by non-authorized personnel or misuse, alterations, normal wear and tear, or accidental damage. The defective unit must be returned to General Tools & Instruments or to a General-authorized service center, freight prepaid and insured.
Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product. In no event shall General be liable for any incidental, special, consequential or punitive damages, or for any cost, attorneys’ fees, expenses, or losses alleged to be a consequence of any damage due to failure of, or defect in any product including, but not limited to, any claims for loss of profits.
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