User Manual

Wide Range InfraRed (IR) Thermometer

with Type K input and Laser Pointer

MODEL 42515

Introduction

Congratulations on your purchase of the Model 42515 IR Thermometer. The Model 42515

IR thermometer measures and displays non-contact (infrared) temperature readings up to

1472 o

F (800 o

C). The built-in laser pointer increases target accuracy while the backlit LCD and handy push-buttons combine for convenient, ergonomic operation. The Type K thermocouple input provides contact measurements up to 1370 o

C (2498 o

F)*. 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.

* The supplied thermocouple is rated for 250 o

C (482 o

F).

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

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Meter Description

4. Battery and Switch compartment

8. Temperature units ( o

C or o

F) switch

9. Test lock ON / OFF switch

10. Alarm ON / OFF switch

Note that switches are located in the battery compartment behind the battery.

2

1

3

4

8

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Operating Instructions

IR (non-contact) 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, the flashing ‘SCAN’ icon, the emissivity, and the unit of measure will appear.

Note: Replace the 9V battery if the display does not switch on.

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 to this is if the TEST LOCK switch is set to ON.

Note: Select the temperature units (ºF/ºC) using the top switch inside the battery compartment

Backlight/Laser Pointer

1. While pulling the Trigger, push the backlight/laser button once to turn on the backlight.

2. Press it again to turn on the laser pointer. When the laser is ON the laser icon will appear in the LCD.

3. Press the laser button to turn the backlight off.

4. Pressing it again turns the laser off.

Note: Backlight and Laser settings will be retained after the meter powers down.

Type-K (contact) Measurements

1. Plug the Type-K thermocouple sensor into the jacks at the bottom of the instrument.

The jack accepts a standard sub-miniature connector. Note that one plug spade is wider than the other and the plug can only be inserted into the meter in one direction.

2. Pull the trigger to turn the instrument ON.

3. In order to keep the instrument’s power on while testing, the user can a:) hold the trigger or b:) lock the instrument on by setting the center dip switch to the ON position

(switches are located inside of the battery compartment).

4. Repeatedly press the MODE button until the bottom display line of the LCD reads ‘T k’.

The temperature shown to the right of the ‘T k’ symbol is the temperature that the

Type-K thermocouple is sensing.

5. Hold the thermocouple in air or touch the tip of the sensor to the device that is to be tested. The LCD’s bottom temperature display will provide the measurement value.

6. The supplied thermocouple is rated for 250 o

C (482 o

F).

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The MODE button options

The MODE button is used to access the programming functions of the instrument. The selected function is displayed on the bottom line of the LCD. Each parameter is listed below with a detailed account of its use. Press the MODE button to step from one parameter to the next.

EMS (Emissivity Value)

To change the emissivity value, use the UP and DOWN arrows (the range is 0.10 to

1.00). The current emissivity setting is always shown at the top of the LCD display. A setting of 0.95 covers about 90% of all applications. Emissivity is discussed in a dedicated section of this manual.

MAX (Maximum function)

In the MAX mode, only the highest reading encountered in the current measurement session is displayed

MIN (Minimum function)

In the MIN mode, only the lowest reading is displayed

DIF (Max minus Min value)

In the DIF mode, the MAX less the MIN is displayed.

AVG (Average value)

In the AVG mode, all of the readings in the current measurement session are averaged and the value is displayed.

HAL (High Alarm setting)

The temperature that, when exceeded, causes the audible/visual alarm to trip.

LAL (Low Alarm setting)

The temperature that, when exceeded high to low, causes the audible/visual alarm to trip.

T k (Type-K contact thermocouple sensor function)

The temperature reading of the Type-K contact probe is shown next to the ‘T k’ icon display.

If the sensor is not correctly inserted to the meter the display will show all dashes ‘-----‘.

Automatic Emissivity Adjustment

The 42515 has the ability to automatically calibrate the emissivity setting. However, in order to do so, the temperature of the measured surface must be above 100ºC (212ºF).

Follow the steps below to use the automatic emissivity adjustment feature:

1. Press the MODE button until the EMS (Emissivity) icon appears on the lower LCD line.

2. Press and hold the Laser/Backlight button until the EMS icon begins to blink and the emissivity value is displayed as “___”.

3. The IR temperature will be displayed on the middle line of the LCD and the Type-K temperature will be displayed on the lower LCD line.

4. Touch the Type-K sensor to the surface and, at the same time, take an IR reading.

5. When both the IR and the Type-K measurements stabilize, press the UP or DOWN arrow button. The new emissivity value will now be displayed.

6. Proceed to take measurements.

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Over-range Indicator

If the temperature measurement exceeds the specified temperature range, the thermometer will display dashes in place of a temperature reading.

High and Low Alarm Feature

The Model 42515 has an alarm feature whereas a High Alarm setting and a Low Alarm setting can be programmed by the user. When either Alarm point is reached the meter will alert the user via an audible beep and LCD display icon. Follow the steps below:

1. Press the MODE button until the HAL (High Alarm) parameter is displayed. Use the

UP and DOWN arrow keys to set the desired High Alarm setting.

2. Press the MODE button until the LAL (Low Alarm) parameter is displayed. Use the

UP and DOWN arrow keys to set the desired Low Alarm setting.

3. When an alarm limit is reached, the audible alarm will sound and the display icon

HIGH or LOW will appear in the lower right hand corner of the LCD.

4. Note that if the bottom dip switch (located in the battery compartment) is set to OFF, the audible alarm will be disabled.

Battery Replacement

When the low battery symbol appears on the lower left side of the display, replace the meter’s battery (9V). The battery compartment is located behind the light green panel that surrounds the meter’s trigger

(see diagram). Open the compartment by pulling the light green panel down from the trigger area. Replace the 9V battery and close the battery compartment cover.

You, as the end user, are legally bound (Battery ordinance) to return all used batteries and accumulators; disposal in the household garbage is prohibited!

You can hand over your used batteries / accumulators at collection points in your community or wherever batteries / accumulators are sold!

Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle

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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 motion) until the hot spot is located.

Field of View

The meter’s field of view is 13:1. For example, if the meter is 13 inches from the target

(spot), the diameter of the target must be at least 1 inch. Other distances are shown in the field of view diagram. Note that measurements should normally be made as close as possible to the device under test. The meter can measure from moderate 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.

2cm

Diameter of Spot

4cm

8cm

16cm

26cm

52cm

104cm

Distance to Spot

208cm

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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 42515, 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

Asphalt

Emissivity

0.90 to 0.98

Material under test

Cloth (black)

Emissivity

0.98

Concrete 0.94 0.98

Cement 0.96 Leather 0.75 to 0.80

Soil

Water

Ice

Snow

Glass

Ceramic

Plaster

Mortar

Brick

0.92 to 0.96

0.92 to 0.96 Lacquer (matt)

0.96 to 0.98 Rubber (black)

0.83

0.90 to 0.95 Timber

0.90 to 0.94

0.80 to 0.90

0.89 to 0.91

0.93 to 0.96

Lacquer

Plastic

Paper

Copper Oxides

Iron Oxides

Textiles

0.80 to 0.95

0.97

0.94

0.85 to 0.95

0.90

0.70 to 0.94

0.78

0.78 to 0.82

0.90

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Specifications

Infrared Thermometer (Non-contact) Specifications

Range / Resolution -50.0 to 800.0

o

C (-58.0 to 1472.0

o

Accuracy -50 to -1°C (-58 to 30°F) ± 2.0%rdg or ±3°C/6°F whichever is greater

-0.5 to 65°C (31°F to 150°F )

66 to 315°C (151°F to 600°F)

± 2.0%rdg or ±2.5°C/4.5°F whichever is greater

± 2.0%rdg or ±2°C/4°F whichever is greater

316 to 800°C (600F to 1472°F) ± (2.5%rdg + 2.5°C/5°F)

Note: Accuracy is specified for the following ambient temperature range: 23 to 25°C (73 to77°F)

0.10 to 1.00 adjustable (Automatic adjust above 212 o

F or 100 o

C) Emissivity

Field of View D/S = Approx. 13:1 ratio (D = distance; S = spot or target)

Laser pointer Class 2 laser < 1mW power; Wavelength is 630 to 670nm

IR Spectral response 8 to 14 μm (wavelength)

Type K Thermocouple (Contact) Specifications

Range / Resolution -50.0 to 1370.0

Accuracy o

C (-58.0 to 1999.9

2000°F to 2498°F*

± (1.5% of rdg + 1ºC/2ºF o

F) 0.1

o

1°

Note: Accuracy is specified for the following ambient temperature range: 18 to 28ºC (64 to 82ºF)

* The supplied thermocouple is rated for 250 o

C (482 o

F).

General Specifications

Display Backlit LCD display with function indicators

Display update rate

Operating Temperature

Operating Humidity

1 second approx.

0 o

C to 50 o

C (32 o

F to 122 o

F)

80% Relative Humidity max.

Power Supply

Automatic Power Off

Weight

Dimensions

9V battery

Meter shuts off automatically after 7 seconds

180g /6.4 oz.

82 x 42 x 160mm (3.2 x 1.6 x 6.3”)

Copyright © 2009 Extech Instruments Corporation

All rights reserved including the right of reproduction in whole or in part in any form.

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