|
|
|
GAS DETECTION - SULPHUR DIOXIDE |
|
|
 |
|
|
|
|
Sulphur dioxide SO2
Sulphur dioxide is a colorless gas with a characteristic odour that
is formed when sulphur or sulphur-containing substances (eg oil and
coal) are burned.
Sulphur dioxide is emitted from boilers fired with sulphur fuel and
it is partly this gas that gives rise to so-called acid rain which
acidifies lakes and soils.
Sulphur dioxide, together with water forms sulphur.
Sulphur dioxide is irritating to eyes and mucous membranes.
Odour threshold is 0.5 ppm.
The first systems appear at a few ppm, and at a bit above 100 ppm it
is immediately dangerous to be exposed to gas for a longer period.
Even higher concentrations are lethal after only a short time.
Poisoning symptoms may come much later why it is important that a
person exposed to the gas, sees his/her doctor.
Hygiencic threshold limit values:
Level value = 2 ppm
Maximum value = 5 ppm
Alarm should be adjusted to these levels with level limit as the
first alarm and maximum limit as second alarm limit.
Sensor Placement
The Sulphur dioxide is about twice as heavy as air which means that
it will sink to the floor. Detectors should therefore be placed low.
Spaces in low locations should be monitored since high
concentrations can be collected there.
References |
IP65,
Standard -
Wall design |
|
Set-up |
Address list |
|
|
|
 |
|
|
|
|
Modbus |
Modbus |
Manual |
Datasheet |
|
|
|
|
IP65,
Duct design |
|
|
|
IP65,
Sulphur dioxide detector with display |
|
|
|
IP54 |
|
|
|
|
|
|
IP |
|
|
|
|
|
|
|
|
|
Protection
class |
|
|
|
|
Low cost IP44
|
|
|
|
IP |
|
|
|
|
|
|
|
|
|
Protection
class |
|
|
|
|
Compatible with different types of bus systems |
|
|
|
Gas Central for 1-2 sensors (1 built-in) with
relay outputs for 4 alarm levels,
internal
buzzer, operator panel and display |
|
|
|
|
|
|
|
Warning lights for sulphur dioxide detectors
|
|
Gas alarm plate for sulphur dioxide detector |
|
|
|
Warning Siren for sulphur dioxide sensors |
|
|
|
Combined warning siren and flash light for
sulphur dioxide sensors |
|
|
|
|
ATEX Gas detectors are available for 2
explosion classes as follows:
Zone 1 is available with or without display .
Gas detectors for ATEX Zone 1 are located in a flameproof enclosure,
EEx d
The shell is such that ignition and
combustion within the shell of a potential explosive gas mixture is
not propagated to the explosive mixture outside the enclosure and
the enclosure can thus endure the resulting explosion pressure
without damage.
In Zone 1 ,
one can expect an explosive atmosphere to occur during normal
operation but the presence of it is relatively
short.
The equipment shall not be a source of
ignition in normal operation or when an error occurs.
Gas detectors for ATEX Zone 2 are of the
design Non-sparking EEx nA
EEx nA is a non-sparking piece
equipment.
In Zone 2, you need not count with an
explosive atmosphere to occur during normal operation, and if it
should occur, which is probably rare it is of
short duration.
The equipment shall not be a source of
ignition during normal operation.
|
 |
|
|
|
|
|
ATEX |
Modbus
ATEX |
|
|
 |
|
|
|
|
|
Datasheet |
Address list |
EEx-d ATEX Protection Class
|
|
|
|
EEx-n ATEX Protection Class |
|
|
|
|
|
|
