P1.3
5.1 Switching on the sample gas pump
Before switching on the unit, check:
– the hose- and electrical connections are not damaged and correct installed.
– no parts of the sample gas pump have been removed (e.g. cover).
– the gas inlet and outlet of the sample gas pump are not closed.
– the pre-pressure is below 0.3 bar.
– a bypass is installed for continuous operation for throttling below 150 L/h
– ambient parameters are met.
– data on the rating plate is met.
– the voltage and frequency of the motor match the mains values.
– electrical connections are securely connected and monitoring devices are connected and set as prescribed.
– air inlets and cooling surfaces are clean.
– ventilation slots in the housing cover are not covered or dirty, but are freely accessible.
– precautions have been taken; earthing!
– the necessary safety and monitoring devices, depending on the application, are installed and functional (e.g. protective mo-
tor switch, manometer, flame arrester, temperature monitor, depending on pump type).
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
CAUTION
Risk of injury by moving parts
The device may be damaged if it falls down of by impacts. Pay attention to any accessible
moving parts.
Operation without cover or with damaged cover is not allowed!
The sample gas pump is suitable for delivering gases only. It is not suitable for liquids.
The sample gas pump should be operated without pressure. A system pressure above 0.3 is not allowed. The gas outlet must not
be closed. The flow rate must be at least 50 l/h (150 l/h with system pressure 0.3 bar). If the flow rate continuously is throttled be-
low 150 l/h during operation, the flow rate must be controlled with a bypass valve.
NOTICE
Extreme throttling reduces the life time of the bellow.
If the pump is equipped with a bypass valve, the flow rate can be adjusted. Do not apply force when turning the valve, because
the valve may be damaged otherwise! The turning range of the valve is about 5 turns.
17
Bühler Technologies GmbH
BE420023 ◦ 03/2020
