User Manual Mini InfraRed Thermometer With Laser Pointer and High‐Low Alarms Model IRT25 Additional User Manual Translations available at www.extech.
EXTECH INSTRUMENTS Introduction Congratulations on your purchase of the IRT25 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.
EXTECH INSTRUMENTS Description 4 Meter Description 1. 2. 3. 4. 5. 6. 7. 8.
EXTECH INSTRUMENTS Operation Meter Power The meter is powered by two 1.5V AA batteries. With fresh batteries installed, the meter switches ON when the trigger is pulled. The batteries are located in the meter handle; pull the battery compartment lid away from the body of the meter to open. Refer to the Maintenance section for more Battery Installation instructions. The battery icon provides battery status indication. Replace the batteries as soon as the battery status icon flashes.
EXTECH INSTRUMENTS Setting Mode Release the trigger and press the SET button to access the Setting Mode. Use the SET button to navigate through the Setting Mode fields and use (UP) and the MAX‐MIN (DOWN) buttons to make changes.
EXTECH INSTRUMENTS Locating Hot or Cold Spots To detect a hot or cold spot, aim the thermometer at a region beyond the target and then scan the entire region in a slow, up/down motion. Distance to Spot Ratio (Field of View) The meter’s field of view is 12:1 (distance to spot ratio). For example, if the meter is 24 inches from the target (spot), the diameter of the target must be at least 2 inches. Other distances are shown below in the field of view diagram.
EXTECH INSTRUMENTS Measurement Notes 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.
EXTECH INSTRUMENTS Replacing Batteries When the battery icon flashes, or when the meter doesn’t switch ON, replace the batteries. The battery compartment is located in the handle grip. The battery compartment lid is located just below the trigger. Pry the compartment lid off to reach the compartment. Replace the 1.5V AA batteries following correct polarity and then close the battery compartment lid.
EXTECH INSTRUMENTS Specifications Infrared Thermometer Specifications Range / Resolution ‐20.0 to 371.0oC (‐4.0 to 700.0oF) Accuracy ‐20~0oC (‐4~32oF): ±5°C (9°F) 0~371oC (32~700oF) ±2°C (3.6°F) or 2% of reading (whichever is greater) Note: Accuracy is specified for the following ambient temperature range: 21 to 25°C (70 to 77°F) Emissivity Adjustable from 0.10 to 1.
