Cut Sheet

ManualsBrandsFluke ManualsIR WindowsIR-Window 68 mm

2 Fluke Corporation CLKT C-Range Infrared Window for outdoor applications

3460346 FLK-050-CLKT 3460387 FLK-075-CLKT 3460439 FLK-100-CLKT

Optic data

Crystal insert diameter 50 mm (1.97 in) 75 mm (2.96 in) 100 mm (3.94 in)

Viewing aperture diameter 43 mm (1.7 in) 68 mm (2.7 in) 89 mm (3.5 in)

Viewing aperture area 1452 mm

(2.25 sq in) 3632 mm

(5.63 sq in) 6322 mm

(9.79 sq in)

Thickness 2 mm (0.08 in) 2 mm (0.08 in) 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

TUV

Cyclic humidity withstand Yes

Vibration withstand Yes

NEMKO

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

Detailed speciﬁcations

Why is available area important?

Understanding the difference between “Optic Diameter”

and “Available Area” gives the thermographer a measure

of how much infrared energy is passing through the

window. The more energy, the better the reading. The

entire area of a crystal IR Window is available for infrared

transmission for optimum repeatable results.

Mesh grids may have a larger “optic diameter” but the

grid itself blocks the IR signal. The amount of radiation

available to the camera via mesh windows is signiﬁcantly

reduced and the signal may be irregular.