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3 Use in explosion risk areas pursuant to Directive 94/9/EC (ATEX)

Area of use:

Bi-metal thermometers are intended for installation in pipes, tanks, plant and machinery to measure the temperatures

of gaseous and/or liquid materials. The requirements for the explosion area are limited to Zone I and II, Category 2,

Group II for gas and dust.

Permitted temperatures:

A temperature class is not specified, since no heating emanates from the device. The ambient temperature is limited

to the range -20 °C to 60 °C.

For the non-electrical part of the devices, the standards EN 13463-1, EN 13463-5 and EN 60079-0 are applicable with

regard to explosion protection. The relevant requirements of these standards are satisfied.

The documentation has been filed with TÜV-Nord-Cert (see declaration of conformity).

Labeling:

II 2 GD c Tx°C IP66

The detailed technical information can be found in the documents in the Appendix, Chapter 12.

The label with the serial number and type designation is located on the outside right of the housing. The nature of the

subject characteristics is encoded in the type designation.

The label with the marking for explosion risk areas is located on the housing.

Type designation

###=A#=###=ATEX or ###=ART#=###=ATEX

50=E#=###=ATEX or 50=ERT#=###=ATEX

Bi-metal helix

Stem

Shaft

Process connection

Case

Pointer

Window

Ring

The temperature is transferred through thermal conduction onto the bi-metal helix, which is firmly gripped on one side.

Due to its construction, using 2 metals with different coefficients of thermal expansion, it rotates proportionally to the

temperature change. This rotary motion is transferred via a shaft to the pointer. The angle of rotation for the complete

range is approx. 270°.

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