User’s Manual Dual Laser InfraRed (IR) Thermometer MODEL 42511 Introduction Congratulations on your purchase of the Model 42511 IR Thermometer. This Infrared o thermometer measures and displays non-contact temperature readings up to 1100 F o (600 C). At 12”, the built-in dual lasers converge to 1” target spot to insure accurate targeting and temperature measurement. The adjustable emissivity feature allows the IR thermometer to measure the temperature of virtually any surface. Proper use and care of this meter will provide years of reliable service. Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for three years from date of shipment (a six month limited warranty applies on sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA number). A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied. Safety • Use extreme caution when the laser pointer is on • Do not point the beam toward anyone's eye or allow the beam to strike the eye from a reflective surface • Do not use the laser near explosive gases or in other potentially explosive areas 2 42511 V4.2 2/08 Meter Description 1. Dual Laser pointers 2. LCD Display 3. Function Buttons 4. Measurement Trigger 5. Battery and F/C Switch compartment DISPLAY 1. SCAN, measurement in progress 2. HOLD, last measurement locked in display 3. Laser pointer active 4. Power locked ON 5. High limit alarm 6. Low limit alarm 7. C or F temperature units 8. Main temperature display 9. Low battery icon 10. MAX icon 11. Emissivity setting 12. Emissivity icon 13. Max temperature display 3 42511 V4.2 2/08 4 42511 V4.2 2/08 Operating Instructions Temperature Measurements 1. Hold the meter by its handle and point it toward the surface to be measured. 2. Pull and hold the trigger to turn the meter on and begin testing. The temperature reading, MAX temperature reading, the ‘SCAN’ icon, the emissivity value, and the unit of measure will appear. 3. Release the Trigger and the reading will hold for approximately 7 seconds (HOLD will appear on the LCD) after which the meter will automatically shut off. The only exception is if the LOCK mode is set to ON. Note: Select the temperature units (ºF/ºC) using the switch inside the battery compartment Field of View The meter’s field of view is 12:1. For example, if the meter is 12” (30cm) from the target (spot), the diameter of the target must greater than 1” (2.5cm). Other distances are shown in the field of view diagram (illustrated below and on the side of the meter). Measurements should normally be made as close to 12” as possible to the device under test. The meter can measure from greater distances but the measurement may be affected by external sources of light. In addition, the spot size may be so large that it encompasses surface areas not intended to be measured. Dual Laser Pointer The dual laser pointers are designed to cross at a distance of 12” (30cm). The spot size at this distance is 1” (2.5cm) in diameter and this is the recommended distance to target for most measurements. To turn the lasers on/off: @45cm 3.75cm @18” 1.5” 1. Press and release the Trigger 2. While HOLD is on the display, press the laser button once to turn on the lasers on or off. 3. The laser icon will appear in the LCD when the laser function is enabled. 4. The status of the laser will be stored in memory and will remain as the ON condition until changed. 5 @30cm 2.5cm @150mm 12.5mm @12” 1” @6” 0.5” 42511 V4.2 2/08 6 42511 V4.2 2/08 MAX (maximum) temperature display The highest reading encountered during a single measurement scan is displayed in the MAX display field. Backlight 1. Press and release the trigger 2. While HOLD is on the display, press the backlight button backlight on or off. once to turn on the 3. The backlight will illuminate in the LCD when the feature is enabled. 4. The status of the backlight will be stored in memory and will remain as the ON condition until changed. 5. Note: Use this feature sparingly and only as needed since the backlight puts an extra strain on the battery. The MODE button options The MODE button is used to access the Test Lock, High alarm, Low alarm and Emissivity adjustment features of the instrument. 1. Press and release the trigger 2. While HOLD is on the display, press the MODE button to step through and program the following features. A blinking icon indicates the feature is selected. E= (Emissivity Value) Press the ▲ or ▼ button to change the emissivity value (Test Lock mode On/Off) Press the ▲ or ▼ button to turn the lock feature ON or OFF (High Alarm On/Off) Press the ▲ or ▼ button to turn the High Alarm feature ON or OFF (High Alarm setting) Press the ▲ or ▼ button to set the high alarm limit value in the main display (Low Alarm On/Off) Press the ▲ or ▼ button to turn the High Alarm feature ON or OFF (Low Alarm setting) Press the ▲ or ▼ button to set the Low alarm limit value in the main display 7 42511 V4.2 2/08 Emissivity Adjust The adjustable emissivity feature allows the user to measure many surface colors, finishes, and textures. A separate section is provided later in this guide that covers emissivity in greater detail. Test Lock feature The Test Lock feature disables the Auto Power Off feature for the period of use when selected. The feature is useful for long term temperature monitoring and hands free use. The meter will revert to auto power off if the trigger is pressed during a locked scan. High and Low Alarm Feature The meter has a programmable high and low alarm feature. When either alarm point is reached the meter will alert the user via an audible beep and a blinking LCD display icon. The alarm limit is set and the feature is enabled/disabled using the MODE button. The setting is stored and memory and will remain as the “turn-on” condition until changed. Temperature Units The temperature units can be set to °F or °C using the switch located in the battery compartment. Over-range Indication If the temperature measurement exceeds the specified temperature range, the thermometer will display dashes in place of a temperature reading. Battery Replacement When the low battery symbol appears on the display, replace the meter’s battery (9V). The battery compartment is located behind the panel that surrounds the meter’s trigger. Open the compartment by pulling the panel down from the trigger area. Replace the 9V battery and close the battery compartment cover. 8 42511 V4.2 2/08 IR Measurement Notes 1. The object under test should be larger than the spot (target) size calculated by the field of view diagram (printed on the side of the meter and in this guide). 2. Before measuring, be sure to clean surfaces that are covered with frost, oil, grime, etc. 3. If an object's surface is highly reflective, apply masking tape or flat black paint to the surface before measuring. Allow time for the paint or tape to adjust to the temperature of the surface it is covering. 4. Measurements through transparent surfaces such as glass may not be accurate. 5. Steam, dust, smoke, etc. can obscure measurements. 6. The meter automatically compensates for deviations in ambient temperature. However, it can take up to 30 minutes for the meter to adjust to extremely wide changes. 7. To find a hot spot, aim the meter outside the area of interest then scan across (in an up and down or side to side motion) until the hot spot is located. Emissivity and IR Measurement Theory IR Thermometers measure the surface temperature of an object. The thermometer’s optics sense emitted, reflected, and transmitted energy. The thermometer’s electronics translate the information into a temperature reading which is then displayed on the LCD. The amount of IR energy emitted by an object is proportional to an object's temperature and its ability to emit energy. This ability is known as emissivity and is based upon the material of the object and its surface finish. Emissivity values range from 0.1 for a very reflective object to 1.00 for a flat black finish. For the Model 42511, the emissivity is adjustable from 0.1 to 1.00. Most organic materials and painted or oxidized surfaces have an emissivity factor of 0.95. When in doubt, set the emissivity to 0.95. Emissivity Factors for Common Materials Material under test Emissivity Material under test Emissivity Asphalt 0.90 to 0.98 Cloth (black) 0.98 Concrete 0.94 Skin (human) 0.98 Cement 0.96 Leather 0.75 to 0.80 Sand 0.90 Charcoal (powder) 0.96 Soil 0.92 to 0.96 Lacquer 0.80 to 0.95 Water 0.92 to 0.96 Lacquer (matt) 0.97 Ice 0.96 to 0.98 Rubber (black) 0.94 Snow 0.83 Plastic 0.85 to 0.95 Glass 0.90 to 0.95 Timber 0.90 Ceramic 0.90 to 0.94 Paper 0.70 to 0.94 Marble 0.94 Chromium Oxides 0.81 Plaster 0.80 to 0.90 Copper Oxides 0.78 Mortar 0.89 to 0.91 Iron Oxides 0.78 to 0.82 Brick 0.93 to 0.96 Textiles 0.90 9 42511 V4.2 2/08 Specifications o o Range -58 to 1100 F (-50 to 600 C) Resolution 0.1 < 1000 , 1 > 1000 Accuracy -58°F to 28°F (-50°C to -2°C) ±9°F/4°C 28°F to 200°F (-2°C to 94°C) ±4.5°F/2.5°C 200°F to 400°F (94°C to 204°C) ±(1.0%rdg + 2°F/1°C) 400°F to 800°F (204°C to 426°C) ±(1.5%rdg + 2°F/1°C) 800°F to 1100°F (426°C to 600°C) ±(4%rdg +2°F/1°C) Note: Accuracy is specified for the following ambient temperature range: 73 to 77°F (23 to 25°C) Emissivity 0.10 to 1.00 adjustable Field of View D/S = Approx. 12:1 ratio (D = distance; S = spot or target) Laser pointer Dual, Class 2 laser < 1mW power; Wavelength is 630 to 670nm o o o o IR Spectral response 8 to 14 µm (wavelength) Repeatability o o ± 0.5% of reading or ± 1.8 F (1 C) whichever is greater General Specifications Display Backlit LCD display with function indicators Response time 150ms Over range indication “---------“ Operating Temperature 32 F to 122 F (0 C to 50 C) Operating Humidity 10% to 90%RH operating, <80%RH storage. Storage Temperature 14 to 140 F (-10 to 60 C) Power Supply 9V battery o o o o o o Automatic Power Off 7 seconds, with LOCK to disable Weight 5.7 oz. (163g) Dimensions 5.7 x 4 x 1.6” (146 x 104 x 43mm) 10 42511 V4.2 2/08 Calibration and Repair Services Extech offers repair and calibration services for the products we sell. Extech also provides NIST certification for most products. Call the Customer Service Department for information on calibration services available for this product. Extech recommends that annual calibrations be performed to verify meter performance and accuracy. Support line (781) 890-7440 Technical support: Extension 200; E-mail: [email protected] Repair & Returns: Extension 210; E-mail: [email protected] Product specifications subject to change without notice For the latest version of this User’s Guide, Software updates, and other up-to-the-minute product information, visit our website: www.extech.com Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451 Copyright © 2008 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form. 11 42511 V4.2 2/08