Extech IR320 Instruction Manual

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User Manual

Extech Model IR320

Waterproof, Dual Laser IR Thermometer with Alarm

1. Introduction

Thank you for selecting the Extech IR320 IR Thermometer. The IR320 is a professional non-contact infrared thermometer

that measures surface temperature from infrared energy radiated by the target’s surface. We ship this meter fully tested

and calibrated and, with proper use, it will provide years of reliable service. Please visit our website (www.extech.com)

for the latest version of this User Manual and Customer Support.

2. Product Features

Strong and Durable: 3m (9.8 ft.) drop-proof

Dustproof and Waterproof: IP65

Ergonomic Design: Comfortable handheld, simple and convenient operation

MAX/MIN/AVG/DIF values: Quickly display the Maximum, Minimum, Average (running average updates every two

readings), and Differential (Max minus Min) values

Large Backlit LCD

Tripod mount for hands-free operation

Alarm Function: High/Low temperature alarm provides flashing color-coded LED indicators when triggered

Dual Laser Pointers: To enhance measurement target accuracy

3. Safety Instructions

WARNING

To avoid personal injury, please read the following safety information before using this product:

 Safety Standards Compliance:

CE Identification: EN 61326-1: 2013, EN 61326-2-3: 2013

Laser Safety Standard: Complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to
laser notice no. 50 dated June 24, 2007

 Please do not point the laser toward people or animals directly or indirectly.
 Please do not look at the laser directly or through other optical tools (telescope, microscope, etc.).
 If the battery symbol on the LCD display is flashing, replace the batteries immediately to avoid

inaccurate measurements.

 Before using the product, check the product for damage. Do not use this product if obvious physical

damage is apparent.

 Refer to the Table of Emissivity Factors for Common Materials in this manual before taking

measurements. Reflective objects will cause the measured value to be lower than the actual
temperature value. Set the emissivity to match each given surface type. When measuring, please do not
touch high temperature surfaces.

 Do not use this product near explosive gases.
 To ensure measurement accuracy, place this product in the test environment for more than 30 minutes

before use.

 Avoid keeping the thermometer near high temperature objects for long periods.

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4. Product Description

Meter Description

1. Low Alarm Alert (blue indicator)

2. High Alarm Alert (red indicator)

3. Backlit LCD

4. RCL (Recall MIN-MAX-AVG-DIF) and down arrow button

5. M (Mode) button

6. Battery compartment

7. Battery compartment screw

8. HI-LO (alarm) and up arrow button

9. Laser pointer lenses

10. IR measurement lens

11. Measurement trigger

12. Tripod mount

Display Description

Automatic measurement mode

Laser set to default ON

High/Low Alarm modes
Low battery

Scan mode (trigger pulled)

Measurement Data Hold

Units of measure for temperature

Primary measurement digits (center)

Maximum, Minimum, Average, Differential values
Emissivity setting

Secondary digits for MAX/MIN/AVG/DIF values (lower right)

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5. Operation

Power On and Off

Pull the trigger to power the meter, the LCD (and backlight) will turn on. The thermometer will power off automatically

after approximately eight (8) seconds.

Manual Measurements

1. Pull and hold the trigger after aiming toward the target to measure.

2. The SCAN icon will flash while measuring the targeted surface or object. The center of the measurement spot is

equidistant between the two laser points (enable/disable lasers per the Lasers Enable/Disable section).

3. Read the temperature measurement on the large digits at the center of the LCD.

4. Release the trigger. The SCAN icon disappears and the HOLD icon appears, indicating that the measurement has

stopped and the display is holding the last measured value. The meter will power off automatically after approximately

eight (8) seconds.

Automatic Measurements (trigger-free)

1. Pull and release the trigger to power the meter.

2. Press the M button six (6) times; the will appear on the upper left.

3. Use the arrow buttons to turn the mode ON (or OFF).

4. Pull and release the trigger. The icon will remain ON and the SCAN icon will flash. The thermometer will

continuously measure the target temperature (without having to hold the trigger). Note that In Auto mode, the LCD

backlight will switch off after 2 minutes.

CAUTION: If you enable the lasers (see Lasers Enable/Disable), they will remain ON during the measurement scan.

5. To stop the measurement, pull and release the trigger again. The Auto measure icon and the SCAN icon will

disappear, and the HOLD icon will appear. The meter will stop measuring and will hold the last measured value on the

LCD until it automatically switches off after approximately eight (8) seconds.

MAX/MIN/AVG/DIF Values

With the meter ON, short press the RCL (Recall) button to step through the MAX/MIN/AVG/DIF modes respectively; the

display will show the value of the corresponding mode in the secondary display area (lower right). The MAX value is the

highest reading taken in a given measurement session, the MIN value is the lowest reading, the AVG value is a running

average that updates every two readings, and the differential (DIF) is the MAX minus MIN value.

Alarm Activation

With the meter ON, short press the HI/LO button to select the HI-LO alarm mode, HI-only alarm mode, LO-only alarm

mode, or no alarm mode (the display icons will inform as to what mode is currently selected: HI, LO, HI-LO, or no icons).

When you select the HI alarm mode, the HI LED will flash red when the measured temperature exceeds the high alarm

limit. When you select the LO alarm mode, the LO LED will flash blue when the measured temperature is lower than the

low alarm limit. When you select the HI-LO alarm mode, the HI or LO LED will flash depending on whether the

measured temperature is higher than the HI limit or lower than the LO limit.

HIGH and LOW Alarm Limit Setting

With the meter ON, short press the M button once to access the HI alarm screen or press M twice to step to the LO

alarm screen. Use the up/down buttons to set the alarm thresholds. Short press the up/down buttons to add or

subtract 1 unit, long press to change the units rapidly. The meter will exit the setup screen automatically after five (5)

seconds of button inactivity.