Extech Instruments 42545 User manual

User’s Manual

High Temperature InfraRed Thermometer

with Laser Pointer

MODEL 42545

42545A-EU V4.1 03/09

Introduction

Congratulations on your purchase of the Model 42545A IR Thermometer. The 42545A 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. This meter is shipped fully tested

and calibrated and, with proper use, will provide years of reliable service.

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

Meter Description

1. Laser pointer beam

2. IR Sensor

3. Measurement Trigger

4. Battery and Switch Compartment

5. LCD Display

6. Push-buttons

7. Handle Grip

8. Temperature Units (ºC/ºF) Switch

9. Test Lock ON/OFF Switch

10. Alarm ON/OFF Switch

Note: There is a tripod mount on the bottom of the handle

42545A-EU V4.1 03/09

Operating Instructions

Basic IR 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.

Over-range Indication

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 42545a 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 temperature 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 temperature setting.

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

HIGH or LOW will appear on the LCD.

4. Note that if the bottom switch (located in the battery compartment) is set to OFF, the

audible alarm will be disabled.

42545A-EU V4.1 03/09

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 an explanation for 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 and, when in doubt,

should be set as such. 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.

Battery Replacement

When the battery symbol appears empty or close to empty, 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. 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

42545A-EU V4.1 03/09

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 50:1. For example, if the meter is 50 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.

25”

0.64m

36”

0.91m

50”

1.27m

100”

2.54m

0.5”

1.27cm

0.72”

1.83cm

1.0”

2.54cm

2.0”

5.08cm

Distance to object

Diameter of object

42545A-EU V4.1 03/09

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 42545a, 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

42545A-EU V4.1 03/09

Specifications

Infrared Thermometer Specifications

Range / Resolution -58 to 1832oF (-50 to 1000oC) 0.1oC/F

Accuracy

(of reading) ± (2% of reading + 9°F/4°C) <30°F (-1°C)

± (2% of reading + 4°F/2°C) 30°F to 800°F (-1°C to 426°C)

± (2.5% of reading + 6°F/3°C) 800 to 1000°F(426 to 537°C)

± (3% of reading + 9°F/4°C) >1000°F/537°C

Note: Accuracy is specified for the following ambient temperature

range: 64 to 82°F (18 to 28°C)

Emissivity Adjustable from 0.1 to 1.00 (0.95 default value)

Field of View D/S = Approx. 50:1 ratio (D = distance, S = spot)

Laser power Less than 1mW (Class II)

Spectral response 8 to 14 μm (wavelength)

General Specifications

Display 4½ 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. 90% RH

Power Supply 9V battery

Automatic Power Off Approx. 7 seconds after the trigger is released

Safety compliance CE

Weight 10.2 oz. / 290g

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

Table of contents

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