Fluke 050 CLKT IR Window for Outdoor and Indoor Applications

Increase safety and efficiency for your electrical maintenance staff and reduce the risk of arc-flash with CLKT infrared windows.







Save Time and Conduct More Efficient Electrical Infrared Inspections

Once you’ve installed a Fluke infrared window there is no more need to power down or remove panel doors – you may never have to open the panel door again. Inspections are now conducted quickly, easily and safer than they were before.

Your greatest investment is not what’s behind the panel door; your priority is to offer the ultimate protection for the electricians, engineers and inspectors who risk their lives every day doing their jobs.


Fluke CLKT Infrared Windows are Available in Three Sizes 50 mm (2 in), 75 mm (3 in) and 100 mm (4 in)

Each CLKT infrared window is engineered and tested to withstand electric-arcs up to 50 kA for 30 cycles.

The ClirVu® coating – exclusive to Fluke infrared windows – seals the optic prior to assembly to protect against moisture degradation making it perfect for very hot and very cold outdoor environments.

Each Fluke infrared window is delivered with an identification plate attached for unique, on-site numbering for rapid location confirmation and faster repairs.

CLKT infrared windows come complete with a security access key, installation instructions and self-adhesive drilling template.

For 5 minute or less installation and Autoground consider the CV300


Optic Data Specifications
Crystal insert diameter 100 mm (3.94 in)
Viewing aperture diameter 89 mm (3.5 in)
Viewing aperture area 6322 mm2 (9.79 in2)
Thickness 4 mm (0.16 in)
ClirVu coating Yes
Shortwave IR capable Yes
Midwave IR capable Yes
Longwave IR capable Yes
Ultraviolet (UV) capable Yes
Visual capable Yes
Fusion capable Yes
Underwriters Laboratories (UL) recognized Yes
UL50 environmental Type 3/12
UL746C N/A (Polymer Free)
UL94 N/A (Polymer Free)
Canadian Standards Association (CSA) approval Yes
Environmental Type 3/12
KEMA (Arc-Testing)
ANSI C37.20.7 50 kA for 30 cycles @ 60 Hz
EEMACS 14-1 Type-B 40 kA for 30 cycles @ 60 Hz
ASTA (Arc-Testing)
IEC 62271 20 kA for 5 cycles @ 50 Hz
Cyclic humidity withstand Yes
Vibration withstand Yes
Resistance of insulating materials to 100° Yes
Resistance of insulating material to ball pressure (Brinell) Yes
Glow-wire test 650°C Yes
Lloyds Register
Up to 11 kV marine switchgear, indoor or outdoor Yes
General Specifications
Maximum temperature Gaskets 250°C (482°F)
Body 659°C (1219°F)
Optic 1400°C (2552°F)
Gaskets Low smoke and fume (LSF) compliant silicone
IP rating IP65
NEMA rating Type 3/12 (UL and CSA Third Party Certified)
Vibration rating IEC60068-2-6
Humidity rating IEC60068-2-3
Pull-out strength Up to 630 kg (1388 lb)
Warranty Lifetime replacement against manufacturing defects


Models (1)
Model Name Description
Fluke 050-CLKT Fluke 050 CLKT IR Window for Outdoor and Indoor Applications

  • 2 In. (50mm) C-Range IR Window
  • Kwik Twist


CLKT, CLKTO, CLV Installation Guide Download
CLKT, CLKTO, CLV Installation Guide Supplement Download
Application Notes (4)
IR window field of view guide Download
IR windows engineering control Download
UL recognized and UL listed: What’s the difference? Download
Who sets the rules for electrical testing and safety? Download
Brochures (1)
Fluke IR Windows Brochure Download
Data Sheets (1)
HAWK: C-Range Data Sheet Download