Bühler technologies P1.3 Notice De Montage page 13

P1.3
Lay the lines so the line at the inlet and outlet remains flexible
for an adequate distance (pump vibrates).
The pumps are marked "In" for inlet and "Out" for outlet. Be
sure the gas line connections are tight.
4.4.1 Monitoring the sample gas pump
NOTICE
When following preventive maintenance according to the
maintenance plan, a crack in the bellows is a rare malfunc-
tion, but cannot be completely eliminated.
NOTICE
If the bellow cracked, turn the pump off immediately!
NOTICE
If flammable gases (even above upper explosion limit (UEL))
or toxic gases are supplied, continuous monitoring of the
pump is mandatory.
DANGER
Explosion hazard, danger of poisoning!
A crack in the bellows when conveying flammable or poison-
ous gasses may allow explosive or poisonous gas mixtures to
leak or develop.
Monitor the pump with a flow- and/or vacuum monitoring
system (see flow diagram).
If a pump defect occurs, shut it off immediately.
4.4.1.1 General monitoring measures
Since a crack in the bellow allows the ambient atmosphere to
be sucked in and the sample gas pump continues to generate
pressure, the bellows of the sample gas pumps must be in-
spected regularly.
In addition, the flow rate of the pump (to the sample gas out-
let) must be monitored with a suitable flow meter.
For more information or Inspecting the bellow the mainten-
ance schedule, please refer to the chapter Maintenance at the
end of the operating and installation instructions.
4.4.1.2 Monitoring measures when conveying
flammable and/or toxic gasses
Conveying flammable and/or toxic gasses further requires
continuous monitoring of the sample gas pump during oper-
ation. This can be done as follows (1) or (2).
1. Flow rate monitor before the pump's gas inlet and after
the gas outlet. A sudden reduction of the suction
volume / flow volume ahead of the pump and consistent
or suddenly increased flow volume after the pump indic-
ates a defective bellow (the pump can convey ambient air
suctioned in due to the tear).
2. Vacuum monitoring before the pump's gas inlet and flow
monitoring after the gas outlet (see illustration). A sud-
den drop in the vacuum before the gas inlet indicates a
defective bellow.
When conveying flammable gasses above the upper explosive
limit (UEL) we further recommend monitoring the lower ex-
plosive limit (LEL) in the installation location.
BX420023 ◦ 03/2020
When conveying toxic gasses we recommend MAC monitoring
(MAC: Maximum Workplace Concentration) at the installation
site.
underpressure
manometer
shut-off valve
sample gas pump
Fig. 1: Sample flow diagram of suitable monitoring
4.5 Electrical connections
DANGER
Explosion hazard
Do not connect or disconnect equipment when a flammable
or combustible atmosphere is present.
WARNING
Hazardous electrical voltage
The device must be installed by trained staff only.
WARNING
Regard National directives concerning installation and opera-
tion of electrical devices in hazardous areas when installing
and commissioning the motor (e. g. EN 60079-14).
CAUTION
Wrong mains voltage
Wrong mains voltage may damage the device.
Regard the correct mains voltage as given on the type plate.
A switch or circuit breaker (in accordance with IEC 60947-1 and
IEC 60947-3) is to be provided. This must be organized 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. Fur-
thermore, the switch must separate the sample gas pump
from the live parts for all the poles.
The device must be operated with the factory-installed motor.
The operator must not replace the device or the motor with a
different model.
The sample gas pump must be secured against unacceptable
excessive warming by using a suitable overload protection
(motor protection circuit breaker). Sample gas pumps with a
BLDC motor have already integrated protection against ex-
cessive warming in the motor electronics.
Observe the rated current for the protective switch (230 V =
0,48 A, 115 V = 0,84 A, 24 V DC = 0,8 A, 12 V DC = 1,55 A).
Make sure that mains voltage and frequency meet the spe-
cifications of the motor (voltage tolerance ± 5 % and frequency
tolerance ± 2 %).
The electrical connection of type P1.3 (115 V/230 V) is made
with the help of flat connectors size 6,3 mm.
manometer
flowmeter
Bühler Technologies GmbH 13