MBA Instruments MLA 900, Руководство по эксплуатации

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Notes on application
MLA 900 Operating Instructions V 2.0 8011381 © MBA Instruments GmbH 9
2.1.3
Regulations and standards fulfilled
The MLA 900 measuring procedure corresponds to:
●
German standard DIN 51 412-T02-79 (»Determining electrical conductivity, field
procedure«)
●
ASTM 02624 »Standard Test Methods for Electrical Conductivity of Aviation and
Distaillate Fuels«
The technical design of the MLA 900 corresponds to:
●
European standard EN 60079-0:2006
●
European standard EN 60079-11:2007
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European standard EN 60079-26:2007
●
European Council Directrive 94/9/EC (ATEX guideline)
●
German »Ordinance on electrical appliances in hazardous locations« (»Verordnung
über elektrische Anlagen in explosionsgefährdeten Räumen«, ElexV) of 13 December
1996.
2.2
Official approval
2.2.1
Definitions of terms
●
An explosive mixture is a mixture of gases, vapours, mists or dusts in which a reaction
continues independently after ignition.
●
An explosive atmosphere contains explosive mixtures of gases, vapours, mists or dusts
with air, including usual admixtures (for example, humidity) under atmospheric
conditions. Atmospheric conditions are here defined as total pressures of 0.8 to 1.1 bar
and gas mixture temperatures of from –20 °C to +60 °C.
A dangerous explosive atmosphere occurs when in the event of an ignition injury may
be caused to persons as a direct or indirect result of the explosion.
●
Hazardous locations are those areas in which a dangerous explosive atmosphere may
occur due to local and operational conditions.
Hazardous locations are divided into zones on the basis the probability (in terms of time
and place) of the presence of dangerous explosive atmospheres:
– Zone 0 includes areas in which a dangerous explosive atmosphere is present
»constantly or for longer periods«; for example, in tank facilities.
– Zone 1 covers areas in which a dangerous explosive atmosphere »occasionally«
occurs; for example, in the vicinity of refuelling nozzles.