42500 - Environmental Thermometer Extech - Free user manual and instructions

Product Type	Environmental Thermometer / Hygrometer
Model	42500
Brand	Extech
Measurement Functions	Temperature, Relative Humidity, Dew Point, Wet Bulb
Temperature Range	-20°C to 60°C (-4°F to 140°F)
Temperature Accuracy	±1°C (±1.8°F)
Humidity Range	0% to 100% RH
Humidity Accuracy	±3% RH (at 25°C, 10-90% RH)
Resolution	0.1°C / 0.1% RH
Display	Backlit LCD, dual display for temperature and humidity
Data Hold	Yes
Min/Max Recording	Yes
Auto Power Off	Yes (adjustable or disable)
Dimensions	120 x 60 x 25 mm (4.7 x 2.4 x 1.0 in)
Weight	Approx. 150 g (5.3 oz) including battery
Power Supply	One 9V battery (6LR61 or equivalent)
Battery Life	Approximately 200 hours (with backlight off)
Accessories Included	9V battery, user manual, holster
Operating Temperature	0°C to 50°C (32°F to 122°F)
Storage Temperature	-20°C to 60°C (-4°F to 140°F)
Cleaning and Maintenance	Wipe with a dry cloth; do not use abrasive cleaners.
Safety	Do not expose to extreme temperatures or direct sunlight for prolonged periods.
Spare Parts and Reparability	Contact Extech customer service for battery compartment or sensor replacement. Not user-serviceable beyond battery.
Certifications	CE, ROHS

Frequently Asked Questions - 42500 Extech

How do I replace the battery?

Open the battery compartment on the back of the meter using a coin or screwdriver. Remove the old 9V battery and insert a new one, observing polarity. Close the compartment securely.

Can I measure temperature in Fahrenheit?

Yes, press the "°C/°F" button to toggle between Celsius and Fahrenheit units.

How do I use the data hold function?

Press the "HOLD" button to freeze the current reading on the display. Press again to release.

What is the accuracy of the humidity sensor?

The humidity accuracy is ±3% RH at 25°C (77°F) for readings between 10% and 90% RH. Outside this range, accuracy may degrade.

How do I set or disable auto power off?

Press and hold the "MODE" button for 3 seconds until "APO" flashes. Use arrow keys to set the time (0-30 minutes) or select "0" to disable. Press "MODE" to confirm.

Can I measure dew point or wet bulb?

Yes, the Extech 42500 can calculate dew point and wet bulb temperature. Press the "MODE" button to cycle through temperature, dew point, and wet bulb readings.

Why does the display show "HH" or "LL"?

These indicate the measurement is out of range. "HH" means over range (too high), "LL" means under range (too low). Ensure the sensor is within the specified range.

How do I clean the meter?

Use a soft, dry cloth to wipe the exterior. For stubborn dirt, use a mild detergent solution on the cloth. Do not immerse in water or use abrasive cleaners.

What does the holster do?

The included holster protects the meter from drops and scratches. It also has a belt clip for convenient carrying during fieldwork.

Where can I find the user manual or support?

The user manual is available for free download on notice-facile.com. For technical support, contact Extech customer service at their website or call the number listed in the manual.

USER MANUAL 42500 Extech

Mini InfraRed Thermometer

with Laser Pointer

MODEL 42500

CE

Introduction

Congratulations on your purchase of the Model 42500 IR Thermometer. This thermometer makes 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 device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website (www.extech.com) to check for the latest version of this User Guide, Product Updates, and Customer Support.

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. LCD Display
2. Function Buttons
3. Handle Grip
4. IR Sensor
5. Laser pointer beam
6. Measurement Trigger
7. Battery Compartment

1. Hold the meter by its Handle Grip and point it toward the surface to be measured. Read the Field of View section below for distance to target ratio information.
2. Pull and hold the Trigger to turn the meter on and begin testing. The display will light if the battery is good. Replace the battery if the display does not light.
3. While continuing to pull the Trigger:

a. Push the Laser button to switch the laser pointer ON. When the laser is on, the laser icon can appear on the LCD over the temperature reading. Aim the red beam approximately a half inch below the point of test (pressing the Laser button again turns the laser off).
b. Select the temperature units using the °C / °F button.
c. Push the backlight button to switch ON the LCD backlighting function.

1. Release the Trigger; the reading will hold for approximately 6 seconds, after which the meter will automatically shut off.

2. The meter defaults to the programmed conditions in use when the meter was last switched off. For example, if the laser is set to ON and the temperature units are set to °F at the time the unit is switched OFF, the unit will switch ON and use the same settings.

Over-range Indicator

If the temperature measurement exceeds 500^ F ( 260^ C), the thermometer will display dashes in place of a temperature reading.

Field of View

The meter's field of view is 6:1. For example, if the meter is 30cm (approx.12") from the target (spot), the diameter of the target must be at least 5cm (approx. 2"). Other distances are shown below in the field of view diagram.

Note that measurements should normally be made closer than 60cm (approx. 2') 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.

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.

Battery Replacement

When the low battery symbol □□p appears on the LCD, replace the meter's 9V battery. The battery compartment is located on the bottom of the meter's handle. Open the compartment by sliding the battery compartment cover off in the direction of the arrow. Replace battery and re-install 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

Infrared Thermometer Specifications

Range / Resolution -20 to 260	°C (-4 to 500°F)	1°C/F
Accuracy ± 2% of reading or ±2	°C (4°F) whichever is greater, from 15 to 50°C (60 to 113°F)± 3% of reading or ±3°C (6°F) whichever is greater, for remainder of range: -20 to 260°C (-4 to 500°F)Note: Accuracy is specified for the following ambient temperature range: 18 to 28°C (64 to 82°F)
Emissivity 0.95 fixed value
Field of View D/S = Approx. 6:1 ratio (D = distance, S = spot)
Laser power Less than 1mW
Spectral response	6 to 14 μm (wavelength)

General Specifications

Display	1999 count, 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. 80% RH
Power Supply 9V battery
Automatic Power Off Meter shuts off automatically after 6 seconds
Weight 140g (4.9 oz.)
Dimensions 170 x 44 x 40mm (6.7 x 1.7 x 1.6")

Copyright © 2015 FLIR Systems, Inc.

All rights reserved including the right of reproduction in whole or in part in any form

www.extech.com