FLIR T840 High-Performance Thermal Camera with Viewfinder

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The FLIR T840 infrared camera is designed to help electric utility and other thermography professionals comfortably survey equipment both indoors or outdoors and seek out signs of failure all day long. Thanks to an integrated eyepiece viewfinder and a bright 4-inch color LCD display, the T840 makes it easy to conduct inspections outside in bright, challenging light conditions. The 180° rotating lens platform and thoughtful ergonomic design helps users quickly diagnose failing components in hard-to-reach areas. Pair the T840 with a FLIR FlexView™ dual field of view lens for the convenience to instantly switch from wide-area to telephoto scanning. A 6° telephoto lens option is also available to ensure accurate temperature measurement of small targets from farther distances.

The purchase of a T840 camera includes a 3-month subscription to FLIR Thermal Studio Pro and FLIR Route Creator.



IR Resolution

464 × 348 pixels (161,472 pixels)

Thermal Sensitivity/NETD

<40 mK (24° lens) or <50 mK (6° lens) @ 30°C (86°F)


±2°C (±3.6°F) or ±2% of reading

Digital Camera

5 MP, with built-in LED photo/video lamp; disabled when 6° lens in use


4″, 640 × 480 pixel touchscreen LCD with auto-rotation

Storage Media

Removable SD card


Color Palettes

Iron, Gray, Rainbow, Arctic, Lava, Rainbow HC

Detector Type and Pitch

Uncooled microbolometer, 17 µm

Digital Camera

5 MP, with built-in LED photo/video lamp; disabled when 6° lens in use

Digital Zoom

1-6x continuous


24° lens: 1.3, 6° lens: 1.35


Continuous with laser distance meter (LDM), one-shot LDM, one-shot contrast, manual

Image Frequency

30 Hz

IR Resolution

464 × 348 pixels (161,472 pixels)

Lens Identification


Macro Mode

71 µm effective spotsize

Minimum Focus Distance

24° lens: 0.15 m, optional macro mode, 6° lens: 5.0 m

Non-radiometric IR video streaming

H.264 or MPEG-4 over Wi-Fi MJPEG over UVC or Wi-Fi


Resizable and movable

Radiometric IR video recording

Real-time radiometric recording (.csq)

Radiometric IR video streaming

Yes, over UVC

Spectral Range

7.5 – 14.0 µm

Thermal Sensitivity/NETD

<40 mK (24° lens) or <50 mK (6° lens) @ 30°C (86°F)


Quadruples pixel count; activated in menu and processed in FLIR Tools





±2°C (±3.6°F) or ±2% of reading

Measurement Presets

No measurement, center spot, hot spot, cold spot, User Preset 1, User Preset 2

Object Temperature Range

-20°C to 120°C (-4°F to 248°F); 0°C to 650°C (32°F to 1202°F); 300°C to 2000°C (572°F to 3632°F)

Spot Meter

3 ea. in live mode



4″, 640 × 480 pixel touchscreen LCD with auto-rotation


Predefined list or touchscreen keyboard


60 sec. recording added to still images or video via built-in mic (has speaker) or via Bluetooth


Battery operating time

Approx. 4 hours at 25°C (77°F) ambient temperature and typical use

Battery Type

Li-ion battery, charged in camera or on separate charger


Operating Temperature Range

-15°C to 50°C (5°F to 122°F)


EN/UL/CSA/PSE 60950-1

Storage Temperature Range

-40°C to 70°C (-40°F to 158°F)


Compatible with FLIR software

FLIR Thermal Studio Suite, FLIR Route Creator, FLIR Ignite, FLIR Research Studio, FLIR Atlas SDK

Laser Pointer



Infrared camera with lens, small viewfinder eyecup, 2 batteries, battery charger, hard transport case, lanyards, front lens cap, power supplies, printed documentation, SD card (8 GB), cables (USB 2.0 A to USB Type-C, USB Type-C to HDMI, USB Type-C to USB), License card: FLIR Thermal Studio Pro (3 month subscription) + FLIR Route Creator Plugin for Thermal Studio Pro (3 month subscription)

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