Ashcroft EI Manual de instruções de instalação e manutenção - Página 9
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3.2 Special operating conditions for safe use in potentially explosive atmospheres
Maintenance work to be carried out, from chap. 9
To avoid possible spark generation due to static charge, the device should always be cleaned with a damp cloth.
The legibility of the nameplates must be checked at regular intervals. It must remain legible throughout the entire
period of use of the device. If a reliable reading is no longer given, please contact the manufacturer.
Impacts on the device must be avoided at all costs. Impacts or shocks can produce sparks.
It is the responsibility of the operator to evaluate attached process components or accessories together with the
delivered device by means of an ignition hazard analysis. The operator must recognize the ignition hazards and
prevent them by using appropriate protective measures.
The operator must comply with the points from chapter 2.3 "Responsibility of the operator".
4 Technical data
For detailed technical data, please refer to the documents in the appendix chapter 12.1
5 Marking of the device
The nameplate with serial number and type designation is located on the housing. The materials used for the wetted
parts as well as other device-specific versions are represented by a type coding on the nameplate and can be broken
down at any time with the aid of the data sheet. The marking for the hazardous areas, in the form of the description of
the type of protection, the permissible ambient temperature and the deposit number, are located in the lower area of
the nameplate.
6 Structure and function
6.1 Overview
1
Bimetallic coil
2
Stem
3
Shaft
4
Process connection
5
Case
6
Pointer
7
Window
8
Ring
6.2 Functional description
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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