Bühler technologies GAS 222.11 Ex1 Guía Rápida página 15

GAS 222.11 Ex1
WARNING
Gas emanation
Sample gas can be harmful to the health!
Check the lines for leaks.
4.6.1 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.
4.6.2 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.
4.7 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).
DANGER
Broken pressure vessel
Gas leak, danger due to flying parts.
Maximum operating pressure of the pressure vessel 10 bar
(145 psi)!
The operating pressure reduces based on the operating
voltage (see solenoid valve type plate).
BX460073 ◦ 04/2023
DANGER
Adiabatic compression during gas blowback (explosion
hazard)!
Adiabatic compression may cause high gas temperatures and
must be checked by the user.
Gas blowback may result in high gas temperatures due to
adiabatic compression. This can cause flammable gases to ig-
nite spontaneously.
a) Blowback of explosive atmosphere / gases is prohibited.
b) Flammable atmosphere / gases (non-explosive) may only
be blown back with nitrogen (inert gas).
4.8 Electrical Connections
WARNING
Hazardous electrical voltage
The device must be installed by trained staff only.
CAUTION
Wrong mains voltage
Wrong mains voltage may damage the device.
Regard the correct mains voltage as given on the type plate.
CAUTION
Equipment damage
Cables damaged
Do not damage the cable during installation. Install a strain
relief for the cable connection. Secure the cable against twist-
ing and loosening. Please note the temperature resistance of
the cables (> 100 °C/212 °F).
Only use cables with a temperature resistance of > 100 °C
(212 °F) to connect to power. Make sure the connecting cable
has sufficient strain relief (match cable diameter to the seal
on the cable fitting).
4.8.1 Connecting the Earth Conductor/Earthing
Always connect all of the designated connections on your unit
to your protective conductor system. Connect the earth to the
additional equipotential bonding conductor connection on
the housing.
4.8.2 Solenoid Valves (Optional)
DANGER
Explosion hazard when opening the solenoid valve
housing
The solenoid valve is a closed system. It must not be removed!
A fuse suitable for the rated current (max. 3 x Ib per
IEC 60127-2-1) or a protective motor switch with short circuit
and fast thermal response (set for rated current) must be con-
nected upstream from each magnet to prevent short-circuits.
• For magnets with a very low rated current, a fuse of the
lowest current value under the IEC standard will suffice.
This fuse must be connected separately, upstream.
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