Electrical Connections - Bühler technologies GAS 222.35 Ex1 Notice De Montage

GAS 222.35 Ex1
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).

4.7 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 cable fitting).
4.7.1 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.
4.7.2 Connecting the Heating Tape
The probes have a self-regulating heating tape which con-
nects inside the junction box per the terminal designations
inside the terminal box. To ensure the highest level of safety
possible (preventing fires, etc.) the manufacturer of the heat-
ing tape requires using RCDs of at least 30 mA. Further use a
circuit breaker for adequate protection.
• Regularly check the function of the electrical protection.
• Also check visible parts of the heating tape for damage,
e.g. from transport. Damaged heating tapes may allow
moisture and dirt to enter and result in arcing and a heat-
ing system fire. Damaged heating tapes must not be
used. Regularly check the visible area of the heating tape
for mechanical damage during operation (visual inspec-
tion).
16 Bühler Technologies GmbH
• Also observe the applicable explosion protection regula-
tions when connecting the heating system to power. The
manufacturer of the heating tape recommends regularly
measuring the insulation resistance of the heating tape.
The insulation resistance must be measured between the
short-circuited copper conductors and the protective
braiding. Measure with an insulation tester at a test
voltage of 2500 VDC. The insulation resistance should be
at least 10 MOhm.
On probes purchased with solenoid valves these will be fact-
ory fitted to the terminal strip.
Inside the junction box (pin assignment see drawing in the
appendix) are terminals for connecting the solenoid valves for
automatic blowback.
4.7.3 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.
• The rated fuse voltage must be equal to or greater than
the specified nominal voltage (U
The fuse rating is specified in the type plate of the solen-
oid valve.
• The limiting breaking capacity of the fuse element must
be equivalent to or greater than the maximum short-cir-
cuit current expected at the installation site (typically
1500 A).
DANGER
Potential equalization/static charge
Static charges can result in incendive sparking.
Avoid static charges. All conductive probe parts must be
earthed!
The housing has a connection for an earth/equipotential
bonding conductor. Ensure the housing is adequately earthed
(minimum conductor cross-section 4 mm
Particularly also observe the requirements of IEC/EN
60079-14!
5 Operation and Control
NOTICE
The device must not be operated beyond its specifications.
NOTICE
The weather hood must be closed during operation!
+10 %) of the magnet.
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BX460055 ◦ 03/2021