Extech Instruments 42540 User manual

User’s Manual

High Temperature InfraRed Thermometer

with Laser Pointer

MODEL 42540

Introduction

Congratulations on your purchase of the Model 42540 IR Thermometer. The 42540 is

capable of non-contact (infrared) temperature measurements at the touch of a button. The

built-in laser pointer increases target accuracy while the backlit LCD and handy push-

buttons combine for convenient, ergonomic operation. Proper use and care of this meter

will provide years of reliable service.

Model 42540 Version 1.3 January 2004

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and

workmanship for one year 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 beam 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

Specifications

Infrared Thermometer Specifications

Range / Resolution -58 to 1400oF (-50 to 760oC) 0.1oC/F

Accuracy ±(2% + 2o) at <932oF (500oC)

± (2.5% + 5o) at > 932oF (500oC)

Note: Accuracy is specified for the following ambient

temperature range: 64 to 82°F (18 to 28°C)

Emissivity 0.95 fixed value

Field of View D/S = Approx. 12:1 ratio (D = distance, S = spot)

Laser power Less than 1mW

Spectral response 6 to 14 µm (wavelength)

General Specifications

Display 3½ digit backlit LCD display with function indicators

Display rate 1 second approx.

Operating Temperature 32°F to 122°F (0°C to 50°C)

Operating Humidity Max. 80% RH.

Power Supply 9V battery

Automatic Power Off Meter shuts off automatically after 6 seconds

Weight 10.2 oz. / 290g

Dimensions 3.9 x 2.2 x 9.0” (100 x 56 x 230mm)

Model 42540 Version 1.3 January 2004

Meter Description

1. Laser pointer beam

2. IR Sensor

3. Measurement Trigger

4. Battery Compartment

5. LCD Display

6. Push-buttons

7. Handle Grip

Operating Instructions

1. Hold the meter by its Handle Grip and point it toward the surface to be measured.

2. Pull and hold the Trigger to turn the meter on and begin testing. The display will light if

the battery is fresh. Replace the battery if the display does not light.

3. While continuing to pull the Trigger:

a. Push the laser button to turn on the laser pointer. When the laser is on, the

laser icon will appear on the LCD over the temperature reading. Aim the red

beam at the point of test (pressing the laser button again turns the laser off).

b. Select the temperature units using the oCor oFbutton.

c. Push the backlight button to turn on the LCD backlight function.

4. Release the Trigger (the reading will hold for approximately 6 seconds) and the meter

will automatically shut off.

Over-range Indicator

If the temperature measurement exceeds 1400°F (760°C), the thermometer will display

dashes in place of a temperature reading.

Measurement Notes

1. The object under test should be larger than the spot (target) size calculated by the field

of view diagram.

2. If the surface of the object under test is covered with frost, oil, grime, etc., clean before

taking measurements.

3. If an object's surface is highly reflective, apply masking tape or flat black paint to the

surface before measuring.

4. The meter may not make accurate measurements through transparent surfaces such

as glass.

5. Steam, dust, smoke, etc. can obscure measurements.

6. The meter compensates for deviations in ambient temperature. It can, however, take

up to 30 minutes for the meter to adjust to extremely wide ambient temperature

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.

Model 42540 Version 1.3 January 2004



Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: support@extech.com

Repair/Returns: Ext. 210; Email: repair@extech.com

Website: www.extech.com

Field of View

The meter’s field of view is 12:1. For example, if the meter is 24 inches from the target

(spot), the diameter of the target must be at least 2 inches. Other distance ratios are

shown in the field of view diagram.

Note that measurements should normally be made less than 2 feet from the target. The

meter can measure from further 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.

Battery Replacement

When the low battery symbol appears on the LCD, replace the meter’s

9V battery. The battery compartment is located behind the panel that

surrounds the meter’s trigger. The panel can be pried open near the

trigger and folded down as shown in the diagram.

Calibration and Repair Services

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of any Extech product, call customer

service for details on services available. Extech recommends that calibration be performed

on an annual basis to ensure calibration integrity.

1”

2”

Distance to Ob

ect

Diameter of Spot 4”

6” 12” 24” 48”

0.5”

Table of contents

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