Wika 73 Manual de usuario descargar pdf (Pagina 8)

11591367.02 05/2012 GB/D/F/E

8 WIKA operating instructions models 73, 74 (ATEX)

2. Safety

A heat return ow from the process, which exceeds the ignition

temperature of the surrounding hazardous area, is not permitted and

must be prevented through appropriate thermal insulation!

The following surface temperatures must not be exceeded:

Potentially explosive atmosphere

Gas, air, vapour, mist Dust, air

Permissible

surface

temperature

≤ 80 % of the ignition

temperature in °C

≤ 2/3 of the minimum

ignition temperature in °C

1) If dust should settle on the instrument (up to a max. 5 mm layer thickness), a safety margin

of 75 K must be maintained between the minimum ignition temperature of the dust layer

and the surface temperature! For thicker dust layers a greater safety margin should be

incorporated!

2.4 Special hazards

WARNING!

Observe the information given in the applicable type

examination certicate and the relevant country-

specic regulations for installation and use in potentially

explosive atmospheres (e.g. IEC 60079-14, NEC, CEC).

Non-observance can result in serious injury and/or

damage to the equipment.

For additional important safety instructions for instruments

with ATEX approval see chapter 2.3 "Additional safety

instructions for instruments per ATEX".

WARNING!

Residual media in dismounted instruments can result in

a risk to persons, the environment and equipment. Take

sucient precautionary measures.

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Wika 73 Manual de usuario Pagina 8