Extech Instruments 42510A Manuel utilisateur

User’s Manual

Wide Range Mini InfraRed

Thermometer

with Laser Pointer

MODEL 42510A

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Introduction

Congratulations on your purchase of the Model 42510A IR Thermometer. This Infrared thermometer

measures and displays non-contact temperature readings up to 650oC (1200oF). The adjustable

emissivity feature allows the IR thermometer to measure the temperature of virtually any surface.

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

combine for convenient, ergonomic operation. Operational functions include adjustable emissivity,

high-low alarms, MIN-MAX memory, and trigger-lock test mode. This instrument is fully tested and

calibrated prior to delivery, proper use and care of this meter will provide years of reliable service.

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

Description

1. IR Sensor and Laser pointer

2. LCD Display

3. Function Buttons

4. Measurement Trigger

5. Battery compartment

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Function buttons

(Laser) and ▲(UP) arrow button

(Backlight) and ▼(DOWN) arrow button

MODE button

Display Description

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 or MIN icon

11. Emissivity setting

12. Emissivity icon

13. MAX or MIN temperature display

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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 will

change as the user scans various targets.

3. The ‘SCAN’ icon remains on until the user releases the trigger.

4. When the trigger is released, the reading will hold for approximately 7 seconds (HOLD will

replace SCAN on the LCD) after which the meter will automatically shut off. The only exception

to this is if the LOCK mode is set to ON.

Laser Pointer

The Laser pointer optimizes the user’s aim during scanning. To turn the Laser on/off:

1. Press and release the Trigger

2. While HOLD is on the display, press the laser button once to turn the Laser on or off.

3. The laser icon will appear in the LCD when the Laser is on.

4. The status of the Laser is remembered by the meter and will remain as the ON condition until

changed.

Backlight

1. Press and release the trigger

2. While HOLD is on the display, press the backlight button once to turn the backlight on or off.

3. The backlight will illuminate 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: The backlight will shorten the battery life; use sparingly and only as necessary.

Over-range Indication

If the temperature measurement exceeds the specified temperature range, the thermometer will

display dashes in place of a temperature reading.

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The MODE button options

The MODE button is used to access the emissivity adjustment, unit of measure selection, MAX-MIN

feature, test-lock feature, and high-low alarms

1. Press and release the trigger

2. While HOLD is on the display, press the MODE button to enter the programming mode and to

step through and configure the following features. A blinking icon indicates the feature is

selected.

E= (Emissivity Value)

Press the ▲or ▼buttons to change the emissivity value from 0.10 to 1.00

C/F (Units of Measure)

Use the ▲and ▼buttons to select the unit of measure.

MAX-MIN (highest and lowest reading memory)

Press the ▲or ▼buttons to select MIN or MAX display

(Lock mode On/Off)

Press the ▲or ▼buttons to turn the lock feature ON or OFF.

(High Alarm On/Off)

Press the ▲or ▼buttons to turn the High Alarm feature ON or OFF.

(High Alarm setting)

Press the ▲or ▼buttons to set the high alarm limit value in the main display

(Low Alarm On/Off)

Press the ▲or ▼buttons to turn the High Alarm feature ON or OFF.

(Low Alarm setting)

Press the ▲or ▼buttons to set the Low alarm limit value in the main display.

Emissivity adjustment

An adjustable emissivity allows for accurate measurements on a variety of surface colors, textures,

reflectivity, and finishes. The topic of emissivity is covered in greater detail in a subsequent section

of this guide.

Temperature Units

The temperature units can be set to °F or °C in the programming mode using the ▲and ▼buttons

MAX (maximum) and MIN (minimum) Temperature display

The highest reading (MAX) or the lowest reading (MIN) encountered during a single measurement

scan is displayed in the lower left-hand display area on the LCD. Select MIN or MAX in the

programming mode using the ▲and ▼buttons

Lock feature

The 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 in the programming mode. The setting is stored and memory

and will remain as the ON condition until changed.

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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 or side to side motion) until the hot spot is located.

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 greater than 2 inches. Other distances are shown in the field of view

diagram. 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.

1”

@12”

2”

@24”

4”

@48”

2.54cm

@30.5cm 5cm

@61cm 10cm

@122cm

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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 42510A, 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

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.

You, as the end user, are legally bound (EU Battery ordinance) to

return all used batteries, 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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Specifications

Range / Resolution 0.1° resolution from -50.0 to 650.0°C (-58.0 to 999.9°F);

1° resolution from 1000°F to 1200°F

Accuracy -50°C to -35°C (-58°F to -31°F) ±4°C/9°F

-35°C to -2°C (-31°F to 28°F) ±3°C/5°F

-2°C to 94°C (28°F to 200°F) ±2.5°C/3°F

94°C to 204°C (200°F to 400°F) ±(1.0%rdg + 1°C/2°F)

204°C to 426°C (400°F to 800°F) ±(1.5%rdg + 1°C/2°F)

426°C to 650°C (800°F to 1200°F) ±(2.0%rdg +1°C/2°F)

Note: Accuracy is specified for the following ambient temperature range:

18 to 28°C (64 to 82°F)

Emissivity 0.10 to 1.00 adjustable

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

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

IR Spectral response 8 to 14 m

Repeatability ± 0.5% of reading or ± 1oC/1.8oF; whichever is greater

General Specifications

Display Backlit LCD display with function indicators

Response time 300ms

Over range indication “---------“

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

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

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

Power Supply 9V battery

Automatic Power Off 7 seconds, with LOCK to disable

Weight 6.4 oz. / 180g

Dimensions 82 x 42 x 160mm (3.2 x 1.6 x 6.3”)

ISO-9001 Certified

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