GAS 222.21 Ex1
1 Introduction
This quick guide will assist you in starting up the unit. Follow
the safety notices or injury to health or property damage may
occur. Carefully read the original operating instructions in-
cluding information on maintenance and troubleshooting
prior to startup. These are located on the included CD and on-
line at
Please direct any questions to:
Bühler Technologies GmbH
Harkortstraße 29
40880 Ratingen
Germany
Tel.: +49 (0) 21 02 / 49 89-0
Fax: +49 (0) 21 02 / 49 89-20
These operating instructions are a part of the equipment. The
manufacturer reserves the right to change performance-, spe-
cification- or technical data without prior notice. Please keep
these instructions for future reference.
1.1 Intended Use
The sample gas probe is intended for installation into gas
analysis systems in commercial applications.
ATEX
Used in zone 1 (explosion group IIC) and 21 (dust group IIIC)
and sampling from zone 0 (explosion group IIC) and 20 (dust
group IIIC).
IECEx:
Used in zone 1 (explosion group IIC) and sampling from zone 0
(explosion group IIC).
DANGER
Explosion hazard
Gas and dust atmosphere must not be present at the same
time. These so-called hybrid mixtures can have different igni-
tion points than the individual components and are therefore
not included in the explosion protection markings for gas and
dust.
Blowing an internal explosive atmosphere back from the gas
probe is prohibited due to the potential risk of explosion. Pro-
cess gases or process gas mixtures must not contain solids
which produce ignitable impact sparks when combined with
the probe materials including filter and sampling tubes.
Probe marking, depending on the selected options and tem-
perature class:
for zone 0/1:
for zone 1:
ATEX:
II 1G/2G Ex db
1
eb
mb
2
IIC T5/T6...T1/T2
Ga/Gb
ATEX:
II 2G Ex db
1
eb mb
2
IIC T6...T2 Gb
IECEx: Ex db
1
eb mb
2
IIC T5/
T6...T1/T2 Ga/Gb
IECEx: Ex db
1
eb mb
2
IIC T6…T2
Gb
for zone 0/21:
for zone 20/1:
ATEX:
II 1G/2D
Ex db
1
eb mb
2
llC T5 ... T1
Ga
Ex tb mb
2
lllC T80 °C ...
T226 °C Db
ATEX:
II 1D/2G
Ex ta lllC T120 °C ... T300
°C Da
Ex db
1
eb mb
2
llC T6 ...
T2 Gb
IECEx: -
IECEx: -
for zone 20/21:
for zone 21:
ATEX:
II 1D/2D Ex ta/tb mb
2
IIIC T120°C/
T80°C...T300°C/T226°C
Da/Db
ATEX:
II 2D Ex tb mb
2
IIIC
T80°C...T226°C Db
IECEx: -
IECEx: -
1
"db" only for GAS 222.21/31 versions with limit switch.
2
"mb" only for version with solenoid valve.
Please refer to the type plate for the exact probe marking.
For devices designed for sampling from zone 0 or zone 20 the
areas of application are indicated in the marking with "/":
II 1G/2G Ex db eb mb IIC T5/T6 Ga/Gb
Parameters for sampling from Zone 0
Parameters for use in Zone 1
The opposite is an
example of the gas
marking with sep-
arate areas of ap-
plication. The same
procedure applies
to dust approvals.
Please note, unlike the operating zone, the temperature class
for sampling zone 0 is lower. This is also indicated by the igni-
tion protection marking in the type plate.
Always note the explosion protection marking in the name
plate of your equipment (and all add-on parts).
Sample gas probes are among the main components in a gas
conditioning system.
• Therefore also note the related drawing in the data sheet
in the appendix.
• Before installing the device, verify the listed technical
data meet the application parameters.
• Further verify all contents are complete.
Please refer to the type plate to identify your model. In addi-
tion to the job number it also contains the item number and
model designation.
Please note the specific values of the device when connecting,
and the correct versions when ordering spare parts.
11
Bühler Technologies GmbH
BX460047 ◦ 03/2021