Bühler technologies GAS 222.35 Ex2 Kurzanleitung Seite 11

GAS 222.35 Ex2
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 Backwashing System and the
Compressed Air Cylinder (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).
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).
BX460056 ◦ 03/2022E
4.7 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 cubic plug/cable fitting).
Please note, the heating system briefly has high starting cur-
rents (max. 6 A). Use a suitable fuse (8 A). When connecting,
also observe the applicable explosion protection regulations
(e.g. IEC/EN 60079-14).
4.7.1 Version Without Terminal Box
The probe includes two cubic plugs per EN 175301-803. The
plug is configured so it cannot be connected reversed. For
safety reasons this configuration must not be modified.
One plug is used to power the two heating cartridges (power
supply (115/230) VAC, 50/60 Hz, see type plate), the other plug
is for the temperature switch (alarm output).
The supply line cross-sections must be suitable for the rated
current. Use a maximum line cross-section of 1.5 mm
cable diameter of 8-10 mm.
Connect the power supply and the intrinsically-safe temperat-
ure switch per the connection diagram.
Connect optional probe accessories directly to the respective
power supply.
4.7.2 Version With Terminal Box
This probe version includes a terminal box. All electrical con-
nections are factory connected to the terminals in the ter-
minal box.
Connect the respective power supply for the two heating cart-
ridges, the intrinsically-safe temperature switch and the op-
tional accessories to the terminals per the connection dia-
gram.
The probe may only be operated using the Ex e cable fittings
and the terminal box closed. Never change the terminal as-
signment.
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