P2.3C, P2.4C
underpressure
manometer
sample gas pump
manometer
flowmeter
shut-off valve
Fig. 1:
Sample flow diagram of suitable monitoring
4.5 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.
For the sample gas pump, a switch and a circuit breaker (in ac-
cordance with the authorisation) is to be provided. This must
be organised to be easily accessible for the operator. The
switch must be labelled as an isolating device for the unit. It
must not be inserted into a mains power line or interrupt the
protective conductor. Furthermore, the switch must separate
the sample gas pump from the live parts for all the poles.
The sample gas pump must be secured against unacceptable
excessive warming by using a suitable overload protection
(motor protection circuit breaker).
Observe the rated current for the setting of the circuit breaker
(see the motor identification plate).
Attach the pump in accordance with the circuit diagram on
the terminal box housing cover and ensure that the strain re-
lief for the connection line is sufficient. When doing this, en-
sure that the pump motor has the correct voltage and fre-
quency (voltage tolerance ± 5 % and frequency tolerance ± 2%).
The supply line and earthing cross sections must be adapted
to the rated current.
Use at least a wire cross-section of 1.5mm
2
.
Connect the circuit breaker of the motor to the local protective
conductor.
Connect the protective conductor in accordance with DIN VDE
0100 without fail to the marked protective conductor ter-
minal.
There must be no foreign objects, dirt or humidity in the ter-
minal box. Close unneeded cable inlet openings and seal the
box itself against water and dust. Use the original seal when
closing the terminal box.
Unused openings must be closed with approved stoppers.
Observe without fail any different information on the identi-
fication plate. The conditions at the operation site must cor-
respond to all the ratings plate information.
5 Operation and control
NOTICE
The device must not be operated beyond its specifications.
DANGER
Danger of explosions, danger of poisoning from pois-
onous corrosive gases
During maintenance work, depending on the medium used,
explosive and/or poisonous corrosive gases could escape,
and this could lead to a danger of explosion or could be haz-
ardous to health.
a) Inspect the leak tightness of your sampling system be-
fore putting the device into operation.
b) Ensure that gases that are hazardous to health are dis-
charged safely.
c) Turn off the gas supply before beginning any mainten-
ance or repair work and flush the gas lines with inert gas
or air. Secure the gas supply so that it cannot be turned
on unintentionally.
d) Protect yourself during maintenance from poisonous /
corrosive gases. Wear appropriate protective equipment.
DANGER
Adiabatic compression (explosion hazard)!
In case of adiabatic compression, high gas temperatures may
occur. The operator is responsible to consider this situation.
Make sure to obey the allowed technical specifications and
ambient conditions, take special attention to the media tem-
perature with respect to temperature class T4. These vary in
addition to gas composition and ambient conditions. Where
necessary, the operator must install temperature sensors for
monitoring and must automatically shut down the sample
gas pump should the temperature exceed the limits.
DANGER
Dangerous electro-static charge (danger of explosion)
During the pumping of, for instance, very dry gases or gases
contaminated with particulate matter, potentially incendi-
ary electro-static charges could build up in the bellow /
pump body.
Provide the pump with a particle filtration with a suitable fil-
ter unit placed before the pump gas inlet.
The extraction of explosive gaseous media (max. zone 2) with
the pumps is not permitted if the gas flow leads to a poten-
tially incendiary electro-static charge in the bellow / pump
body (projected surface area in bellow / pump body ~ 15 cm
2
).
DANGER
Explosion hazard
Flammable media fed into the pump may only be heated to a
maximum of 80 % of their respective ignition temperature.
12
Bühler Technologies GmbH
BX420022 ◦ 08/2018
