Bühler technologies GAS 222.31 Ex1 Mode D'emploi page 15

GAS 222.31 Ex1
DANGER
Explosion hazard due to flame propagation
Severe injuries and damage to the system
If the process holds a risk of flame propagation, install a
flame arrestor.
4.3 Installing the upstream filter
The upstream filter, if necessary with matching extension,
must be screwed in. The probe is then attached to the mating
flange using the included seals and screws.
4.4 Insulation
On heated probes completely insulate any exposed flange
areas and, if applicable, the connection piece to absolutely
prevent thermal bridges. The insulating material must meet
the application requirements and be weatherproof.
4.5 Connecting the Gas Line
The sample gas line must be carefully and properly connected
using a suitable fitting.
This table provides an overview of the sample gas probe con-
nections:
Probe Reservoir
GAS 222 PAV01
Connect- DN65/
ing flange PN6/
1)
DN3"-150
Sample G3/4
gas inlet
Sample NPT 1/4
gas outlet
Blowback G3/8
connec-
tion
Test gas Tube Ø6
connec- mm
1)
tion Tube
Ø1/4
Filling NPT 1/4
port
Condens- G1/2
ate
Bypass NPT 1/4
Control
air
Tab. 1: Gas Probe Connections (Varies by Model)
1)
Varies by version.
Please note the following items when connecting the sample
gas line (NPT 1/4") on heated probes to prevent thermal
bridges:
BX460051 ◦ 03/2021
Ball Ball valve Control
valve/ pneu- valve
blowback matic 3/2-way
valve drive solenoid
(without valve
PAV01)
Ø12
G1/8 G1/4
• Choose the shortest possible screw connection.
• Shorten the connection pipe for the sample gas line as
much as possible. To do so, remove the insulation around
the sample gas line. This is done by loosening the fixing
bolts.
CAUTION
Fragile
The insulation is fragile. Handle with care, do not drop.
After connecting the sample gas line it must be braced and se-
cured with the clamp.
Long sample gas lines may require additional support clamps
along the way to the analysis system! Once all lines have been
connected and checked for leaks, carefully reinstall and secure
the insulation.
WARNING
Gas emanation
Sample gas can be harmful to the health!
Check the lines for leaks.
4.5.1 Blowback Connection
Without accessories installed for the blowback device, the
blowback connection comes with a sealed G3/8 screw-in con-
nection. If you require blowback, you will need to undo this
screw-in connection and ensure the blowback line is connec-
ted properly and tight.
DANGER
Toxic, corrosive gasses
Explosive or toxic gases can develop due to a leaking or open
blowback connection.
4.5.2 Connecting the calibrating gas line (optional)
Connecting the calibrating gas line requires a Ø6 mm or Ø1/4"
pipe fitting.
If the calibrating gas connection was ordered with check
valve, a Ø6 mm or Ø1/4" pipe can be connected directly to the
check valve.
4.6 Connecting the Blowback and Pressure Vessel
(Optional)
The air lines must be connected carefully and properly, using
suitable fittings.
If the probe is equipped with pressure vessel for efficient
blowback (optional), a manual shut-off valve (ball valve) must
be installed in the air supply, immediately upstream from the
pressure vessel.
On probes used to sample flammable gas, nitrogen (inert gas)
must be used for blowback. Blowback of explosive gases is
prohibited.
NOTICE
The operating pressure of the compressed air (inert gas) re-
quired for blowback must always be higher than the process
pressure.
Required pressure differential min. 3 bar (44 psi).
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