GAS 222.21 Ex1
DANGER
Use in explosive areas
Flammable gas or dust atmospheres could ignite or explode.
Avoid the following hazard sources:
Application area!
Never operate the gas probe outside the specifications.
Sampling gases or gas mixtures which are also explosive in
the absence of air is prohibited.
Electrostatic charge (sparking)!
The equipment may only be used where normal operating
conditions do not frequently produce flammable, electro-
static discharge.
Always clean plastic housing parts and decals with a damp
cloth.
Sparking!
Protect the M3 connectors from external blows.
Flame propagation!
If the process holds a risk of flame propagation, install a
flame arrestor.
Adiabatic compression (explosion hazard)
Adiabatic compression may cause high temperatures during
blowback. Never blowback if explosive gas or dust atmo-
spheres are present. Only use nitrogen (inert gas) to blowback
flammable gas.
Dust
If possible, take the electrical components which must be
opened for repair to a dust-free room. If unable to do so, pre-
vent dust from entering the housing.
Zonal carryover when sampling from zone 20, 21, 22
If the particle size of the dusts being filter is smaller than the
fineness of the filter elements used, zonal carryover from the
process to the probe must be expected.
The fineness of the filter elements used must be clearly smal-
ler than the average particle size of dusts in the process gas.
Dust ignition
Regularly clean dust from all components. Dust layers > 5 mm
may have lower smouldering temperatures and the dust
layer could potentially ignite at a temperature below its
smouldering temperature.
Also remove dust under the thermal insulation and from the
gas probe heating tape.
The ignition temperature and smouldering temperature of
flammable dusts or dust layers which are present must be
above the marked surface temperature plus a safety factor
(also see section "Dust atmosphere requirements").
2.3 Equipment Ambient Temperatures
The ambient temperature range may be limited based on the
version. Please note the Ambient temperature ranges under
"Technical Data” in the full operating instructions.
2.4 Permissible gas inlet temperature
The permissible gas inlet temperatures between versions will
vary based on the temperature class of the gas in den outer
zones (see chapter "Technical Data" in the full operating in-
structions).
3 Transport and storage
Only transport the product inside the original packaging or a
suitable alternative.
The equipment must be protected from moisture and heat
when not in use. They must be stored in a covered, dry and
dust-free room at a temperature between -20 °C to 50 °C (-4 °F
to 122 °F).
4 Installation and connection
NOTICE
Accessories may limit critical operating parameters of
the base unit
Adding accessories may limit critical operating parameters.
Ambient temperatures, zone classifications, explosion
groups, temperature classes or chemical resistances of ac-
cessories may vary from the base unit.
Always include all technical data in the operating instructions
and data sheets of all components in the safety assessment.
4.1 Installation site requirements
Sample gas probes are intended for flange mounting.
• Installation site and installation position are determined
based on requirements specific to the application.
• If necessary, the connection piece should be slightly tilted
toward the centre of the channel.
• The installation site should be protected from the
weather.
• In addition, adequate and safe access for installation and
future maintenance work should be provided. Particularly
follow the uninstalled size of the probe tube!
If the probe is transported to the installation site in pieces, it
will first need to be assembled.
4.2 Installation
DANGER
Danger to life and explosion during installation and
maintenance
The unit must not be worked on (assembly, installation,
maintenance) in explosive atmospheres.
DANGER
Explosion hazard
When used in explosive areas
Flammable gasses and dust could ignite or explode.
Never operate the gas probe outside the specifications. Ex-
tracting gases or gas mixtures which are also explosive in the
absence of air is prohibited.
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Bühler Technologies GmbH
BX460047 ◦ 03/2021