Extech Instruments 42545 User manual

User’s Manual

High Temperature InfraRed Thermometer

with Laser Pointer

MODEL 42545

42545A-en-GB_V4.5 1/16

Introduction

Congratulations on your purchase of the Model 42545 IR Thermometer. The 42545 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

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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 42545 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.

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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 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

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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 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

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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 42545, 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

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Specifications

Infrared Thermometer Specifications

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

18 to 28°C (64 to 82°F)

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 m (wavelength)

General Specifications

Display 4½ digit backlit LCD display with function indicators

Display rate 1 second approx.

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

Operating Humidity Max. 90% RH

Power Supply 9V battery

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

Safety compliance CE

Weight 290g / 10.2 oz

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

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