Bühler technologies P2.2 Atex Notice De Montage page 13

P2.x ATEX
• the motor is secured correctly,
• the terminal box cover is closed and the cable entry points
have been properly sealed,
• the elastomer sprocket is correctly mounted to the coup-
ling (only P2.4 Atex / P2.74 Atex) and is not damaged,
• depending on the operating mode, the necessary protect-
ive and monitoring devices are present and functional
(depending on the type of pump, e.g. motor circuit
breaker, manometer, flame arrestor, temperature monit-
oring).
When switching the sample gas pump on make sure that
• no abnormal sounds or vibrations occur.
• the flow rate is neither too low nor too high. This would
indicate a cracked bellow.
5.2 Operating the sample gas pump
The sample gas pump is intended exclusively for the pumping
of gaseous media. It is not suitable for liquids.
The sample gas pump should be operated without pre-com-
pression. A preliminary pressure of more than 0.5 bar is not
permitted. When operating with pre-compression, note the
differing permissible pumphead and media temperatures
given in the data sheet for the P2.7x types. The gas outlet must
not be shut. The flow rate must be at least 50 l/h for the P2.x
Atex and at least 200 l/h for the P2.7x Atex pumps. In the
event of throttling under 150 l/h for the P2.x Atex and under
400 l/h for the P2.7x Atex pumps in continuous operation, the
flow rate must be regulated via a bypass. In this case you
should choose a version with bypass valve.
NOTICE
Extreme throttling reduces the life time of the bellow.
For pumps with an integrated bypass valve, the output power
can be adjusted. Do not expend a great amount of power
when turning the valve as otherwise the valve could be dam-
aged! The turning range of the valve is around seven rota-
tions.
NOTE: Read and observe the maintenance plan!
6 Maintenance
Always observe the applicable safety- and operating regula-
tions when performing any type of maintenance. Please refer
to the original operator's manual on the included CD or online
at www.buehler-technologies.com for maintenance informa-
tion.
7 Service and Repair
Please refer to the original operator's manual on the included
CD or online at www.buehler-technologies.com for a detailed
description of the unit including information on
troubleshooting and repair.
BX420002 ◦ 04/2021 Bühler Technologies GmbH 13