Extech Instruments 42511 User manual

User’s Manual

Dual Laser InfraRed (IR) Thermometer

MODEL 42511

42511 V4.2 2/08

Introduction

Congratulations on your purchase of the Model 42511 IR Thermometer. This Infrared

thermometer measures and displays non-contact temperature readings up to 1100oF

(600oC). 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

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

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:

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.

@12”

1”

@18”

1.5”

@30cm

2.5cm

@45cm

3.75cm

@6”

0.5”

@150mm

12.5mm

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 once to turn on the

backlight on or off.

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

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.

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

42511 V4.2 2/08

Specifications

Range -58 to 1100oF (-50 to 600oC)

Resolution 0.1o< 1000 o,1o> 1000 o

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

IR Spectral response 8 to 14 µm (wavelength)

Repeatability ± 0.5% of reading or ± 1.8oF (1oC) whichever is greater

General Specifications

Display Backlit LCD display with function indicators

Response time 150ms

Over range indication “---------“

Operating Temperature 32oF to 122oF (0oC to 50oC)

Operating Humidity 10% to 90%RH operating, <80%RH storage.

Storage Temperature 14 to 140oF (-10 to 60oC)

Power Supply 9V battery

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)

Table of contents

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