KROHNE SMARTSENS PH 8xxx Ex EN - Manual (Page 7)

DEVICE DESCRIPTION
2
7
SMARTSENS PH 8XXX
www.krohne.com 07/2014 - 4002951402 - MA SMARTSENS PH 8xxx R02 en
2.4 Flammable products
Atmospheric conditions
An explosive atmosphere is a mixture of air and flammable gases, vapours, mists or dusts under
atmospheric conditions. It is defined by the following values:
T
atm
= -20...+60°C / -4...+140°F and P
atm
= 0.8...1.1 bar / 11.6...15.9 psi
Outside of these ranges, for most mixtures no key figures are available for the ignition
behaviour.
Operating conditions
Outside of atmospheric conditions, the explosion protection according to directive 94/9/EC
(ATEX) – regardless of the zone assignment – is not applicable due to the lack of key safety data.
2.5 Equipment category
The sensor is designed in category II 1 G for use in zone 0.
For more information refer to chapter "Flammable products".
DANGER!
The operator is responsible to ensure that the sensor is operated safely in terms of temperature
and pressure of the products used. In case of operation with flammable products the sensor
must be included in the periodic pressure tests of the plant.
INFORMATION!
Definition of zone 0 according to EN 1127-1:
An area in which an explosive atmosphere, as a result of the mixture of flammable substances in
the form of gas, vapours or mist with air, is continuously or for long periods or frequently
present.
.book Page 7 Monday, July 21, 2014 3:08 PM