42512 - Environmental Thermometer Extech - Free user manual and instructions

Product Type	Infrared Thermometer
Brand	Extech
Model	42512
Temperature Range	-58 to 1832°F (-50 to 1000°C)
Accuracy	±4.5°F (2.5°C) from 28 to 200°F; ±1.0% rdg+2°F from 200 to 400°F; varies by range
Emissivity	Adjustable 0.10 to 1.00
Field of View	30:1 (D:S ratio)
Laser	Dual, Class 2, <1mW, 630-670nm
IR Spectral Response	8 to 14 μm
Response Time	150 ms
Display	Backlit LCD with function indicators
Power Supply	9V battery
Auto Power Off	7 seconds (with LOCK disabled)
Dimensions	5.7 x 4 x 1.6 in (146 x 104 x 43 mm)
Weight	5.7 oz (163 g)
Operating Temperature	32°F to 122°F (0°C to 50°C)
Operating Humidity	10% to 90% RH
Storage Temperature	14°F to 140°F (-10°C to 60°C)
Warranty	3 years
Safety Class	Class II Laser Product
Main Functions	Non-contact temperature measurement, dual laser targeting, MAX display, backlight, adjustable emissivity, lock mode, high/low alarms, °F/°C switch
Battery Replacement	Replace with 9V battery when low battery icon appears
Repair Services	Available from Teledyne FLIR; NIST traceable calibration offered

Frequently Asked Questions - 42512 Extech

How do I change the temperature units between °F and °C?

Open the battery compartment located behind the trigger panel. Inside, there is a switch labeled °F/°C. Slide it to your desired unit. The thermometer will then display temperatures in that unit.

How do I turn the dual laser pointers on or off?

Press and release the trigger to activate the meter. While 'HOLD' is displayed, press the laser button (lock icon) once to toggle the lasers on or off. The laser icon will appear on the LCD when enabled. The setting is stored in memory.

What is the field of view and why is it important?

The field of view ratio is 30:1. This means that if you are 30 inches from the target, the measurement spot must be at least 1 inch in diameter. The target should be larger than the spot for accurate readings. Refer to the diagram on the meter and in the manual for distances.

How do I adjust the emissivity setting?

Press and release the trigger. While 'HOLD' is displayed, press the MODE button repeatedly until the emissivity icon (E) and value blink. Use the ▲ or ▼ buttons to change the emissivity from 0.10 to 1.00. Most organic materials have an emissivity of 0.95.

What is the maximum temperature the Extech 42512 can measure?

The thermometer can measure temperatures from -58°F to 1832°F (-50°C to 1000°C). Readings above the range will display dashes '----'.

How do I turn on the backlight?

Press and release the trigger. While 'HOLD' is displayed, press the backlight button (sun icon) once to turn the backlight on or off. The backlight icon will appear on the LCD when enabled. Note that using the backlight shortens battery life.

What does the LOCK feature do and how do I use it?

The LOCK feature disables the automatic power-off function (7 seconds) for continuous monitoring. To enable, press the MODE button while 'HOLD' is displayed until the lock icon blinks, then press ▲ or ▼ to turn LOCK ON. The meter will remain on until the trigger is pressed again.

How do I set the high and low temperature alarms?

Press MODE while 'HOLD' is displayed to cycle through options. First set the alarm ON/OFF, then set the limit value. For high alarm, when 'HI' blinks, press ▲ or ▼ to adjust the temperature. For low alarm, when 'LO' blinks, adjust similarly. When the measured temperature crosses the limit, the meter beeps and the alarm icon blinks.

What does the MAX temperature display show?

The MAX display shows the highest temperature encountered during a single measurement scan. It is displayed on the upper LCD area and updates continuously while the trigger is held.

How should I clean and maintain the thermometer?

Clean the lens and body with a soft, damp cloth. Avoid using solvents or abrasive cleaners. For accurate readings, ensure the target surface is free of frost, oil, or grime. Store the thermometer in a dry place within 14°F to 140°F (-10°C to 60°C).

USER MANUAL 42512 Extech

Dual Laser InfraRed (IR) Thermometer

MODEL 42512

Introduction

Congratulations on your purchase of the Model 42512 IR Thermometer. This Infrared thermometer measures and displays non-contact temperature readings up to 1832°F (1000°C). At 30 inches, built-in dual lasers converge to a 1 inch target spot to insure accurate targeting and temperature measurement. 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.

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

Meter Description

1. Dual Laser pointers
2. LCD Display
3. Function Buttons
4. Measurement Trigger
5. Battery and F/C Switch compartment

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 icon
11. Emissivity setting
12. Emissivity icon
13. Max temperature display

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, MAX temperature reading, the 'SCAN' icon, the emissivity value, and the unit of measure will appear.
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 LOCK mode is set to ON.

Note: Select the temperature units (°F/°C) using the switch inside the battery compartment

Dual Laser Pointer

The dual laser pointers are designed to cross at 75 cm. The spot size at this distance is a 2.5 cm diameter and this is the recommended distance to target for most measurements. To turn the lasers on/off:

1. Press and release the Trigger
2. While HOLD is on the display, press the laser 🔒 button once to turn the lasers on or off.
3. The laser icon ⚙ will appear in the LCD when the laser function is enabled.
4. The status of the laser will be stored in memory and will remain as the "power-on" condition until changed.

MAX (maximum) temperature display

The highest reading encountered during a single measurement scan is displayed in the MAX display

Backlight

1. Press and release the Trigger
2. While HOLD is on the display, press the backlight button ⚙ once to turn on the backlight on or off.
3. The backlight will illuminate in the LCD when the feature is enabled.
4. The status of the backlight will be stored in memory and will remain as the "turn-on" condition until changed.
5. Note: The backlight will shorten the battery life. Only use this feature when required.

The MODE button options

The MODE button is used to access the Emissivity, Lock, High alarm, and Low alarm features of the instrument.

1. Press and release the Trigger
2. While HOLD is on the display, press the MODE button to step through and program the following features. A blinking icon indicates the feature is selected.

= (Emissivity Value)

Press the ▲ or ▼ buttons to change the emissivity value.

(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.

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, using the MODE button. The setting is stored and memory and will remain as the “power-on” condition until changed.

Temperature Units

The temperature units can be set to °F or °C using the switch located in the battery compartment.

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.

Over-range Indication

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

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.

Line drawing of a handheld device with a circular head and curved arrow indicating motion (no text or symbols)

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 30:1. For example, if the meter is 30 inches from the target (spot), the diameter of the target must be greater than 1 inch. 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.

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 42512, 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

Range	-58 to 1832°F (-50 to 1000°C)
Resolution 0.1	° < 1000°, 1° > 1000°
Accuracy	-58°F to -10°F (-50°C to -23°C)	± 14°F (7°C) Typical
	-10°F to 28°F (-23°C to -2°C)	± 8°F (4°C)
	28°F to 200°F (-2°C to 94°C)	± 4.5°F (2.5°C)
	200°F to 400°F (94°C to 204°C)	± (1.0%rdg + 2°F [1°C])
	400°F to 800°F (204°C to 426°C)	± (1.5%rdg + 2°F [1°C])
	800°F to 1832°F (426°C to 1000°C)	± (3%rdg + 2°F [1°C])
	Note: Accuracy is specified for the following ambient temperature range: 73 to 77°F (23 to 25°C)
Emissivity 0.10 to 1.00 adjustable
Field of View	D/S = Approx. 30:1 ratio (D = distance; S = spot or target)
Laser pointer	Dual, Class 2 laser < 1mW power; Wavelength is 630 to 670nm
IR Spectral response	8 to 14 μm (wavelength)
Repeatability	± 0.5% of reading or ± 1.8°F (1.0°C) whichever is greater

General Specifications

Display	Backlit LCD display with function indicators
Response time 150ms
Over range indication “----”
Operating Temperature	32°F to 122°F (0°C to 50°C)
Operating Humidity	10% to 90%RH operating, <80%RH storage.
Storage Temperature	14 to 140°F (-10 to 60°C)
Power Supply	9V battery
Automatic Power Off	7 seconds, with LOCK disabled
Weight	5.7 oz (163 g)
Dimensions	5.7 x 4 x 1.6 in. (146 x 104 x 43 mm)

Three-year Warranty

Teledyne FLIR warrants this Extech brand instrument to be free of defects in parts and workmanship for three years from date of shipment (a six-month limited warranty applies to sensors and cables). To view the full warranty text please visit: http://www.extech.com/support/warranties.

Calibration and Repair Services

Teledyne FLIR offers calibration and repair services for the Extech brand products we sell. We offer NIST traceable calibration for most of our products. Contact us for information on calibration and repair availability, refer to the contact information below. Annual calibrations should be performed to verify meter performance and accuracy. Product specifications are subject to change without notice. Please visit our website for the most up-to-date product information: www.extech.com.

Contact Customer Support

Customer Support Telephone List: https://support.flir.com/contact

Calibration, Repair, and Returns: [e-mail]

Technical Support: https://support.flir.com

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