P1.3
4.4 Connecting the gas lines
A minimum of 20 cm of tubing or piping must be installed between the sample gas pump and other system elements installed
in the gas outlet according to the flow chart (e.g. cooler, analyser, filter, flow regulator, etc.) to ensure compliance with the tem-
perature classes.
The G1/4" threaded holes for the respective screw-in connections are factory closed with plastic plugs to protect from dirt. Screw-
in connections are generally not included in delivery, but are sold separately for metric or for imperial installation.
Avoid mixed-material installation, i.e. piping on plastic bodies. If this cannot be avoided in isolated applications, screw the metal
connections into the PTFE pump body with care, never use force.
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 malfunction, 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 poisonous gasses may allow explos-
ive 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 inspected regularly.
In addition, the flow rate of the pump (to the sample gas outlet) must be monitored with a suitable flow meter.
For more information or Inspecting the bellow the maintenance schedule, please refer to the chapter Maintenance at the end of
the operating and installation instructions.
13
Bühler Technologies GmbH
BE420023 ◦ 03/2020
