Ashcroft A Manual de instruções de instalação e manutenção - Página 5
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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
4 Technical data
The detailed technical information can be found in the documents in the Appendix, Chapter 12.
5 Labeling on the device
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.
5.1 Labeling on the device for explosion risk areas (ATEX)
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
6 Construction and function
6.1 Overview
1
Bi-metal helix
2
Stem
3
Shaft
4
Process connection
5
Case
6
Pointer
7
Window
8
Ring
6.2 Description of function
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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