Buhler GAS 222.21 Ex2, Installation And Operation Instructions Manual

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GAS 222.21 Ex2
DANGER Explosion hazard
Life and explosion risk may result from gas leakage due to improper use.
a) Use the devices only as described in this manual.
b) Regard the process conditions.
c) Check tubes and hoses for leakage.
DANGER Danger to life and explosion during installation and maintenance
The unit must not be worked on (assembly, installation, maintenance) in explosive at-
mospheres.
DANGER
Use in explosive areas
Flammable gasses could ignite or explode. Avoid the following hazard sources:
Application area!
Never operate the gas probe outside the specifications. Extracting 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, electrostatic 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 gas temperatures during blowback. Never blow-
back if gases are explosive . Only use nitrogen (inert gas) to blowback flammable gas .
2.3 Special conditions for safe use
The temperature switch must be operated intrinsically safe. See parameters in chapter “Connecting the Temperature Switch”.
2.4 Ambient Temperature range of the equipment
The ambient temperature range may be limited based on the version. Please note the Ambient temperature ranges under
"Technical Data".
8 Bühler Technologies GmbH BE460048 ◦ 08/2019