Renfert SILENT flow sensor Schnellstartanleitung Seite 17

Checking function
After assembly, check the leak-tightness of the suction route and the function of the SILENT flow sensor.
♦ The SILENT flow sensor is connected to a socket.
♦ The green operating indicator (9) lights up.
♦ The yellow indicator for the defined threshold value lights up (5, 6, 7).
⇒ Switch suction on.
♦ The green operating indicator begins to flash.
♦ The yellow indicator for the defined threshold value lights up.
⇒ Close part of the suction mouth with your hand so that the flow rate drops below the defined threshold
value.
♦ After a short time, the indicator for the corresponding threshold value starts to flash.
♦ The warning tone is output after approx. 30 seconds.
⇒ Pay attention to noises that could indicate leakage.
⇒ Release the suction mouth again and continue to suction for approx. 30 seconds.
♦ The indicator for the corresponding threshold value lights up steadily.
♦ The warning tone is no longer output.
⇒ Switch off the extraction unit.
Operation
Operation
If the flow rate is less than the defined threshold value for a certain period, the corresponding indicator
begins to flash and a warning tone is output every 30 seconds.
If the flow rate is too low at the suction point being monitored, the level of exposure to dust is
harmful to health!
⇒ Stop working at the suction point.
⇒ Stop working at all suction points of the affected extraction unit. This applies to the individual suction
channels of any multi-workbench extraction unit as well as to all suction points operated via a Y-junction
or via extractor switches.
⇒ Determine why the flow rate is too low and resolve the issue.
Suction level is too low.
In the case of multi-workbench extraction units: the
suction power is too low because an additional suc-
tion channel has been connected.
Filter blockage
Changing the filter bag / cleaning the filter do not
result in the expected improvement.
Blockage in the suction point (suction mouth).
Blockage in the suction line.
Leakage in the section of the suction line between
the SILENT flow sensor and the extraction unit.
Cause
- 5 -
Measure
• Choose a higher suction level.
• Stop working with the additional suction channel.
• In the case of extraction units with a pre-filter (filter
bag): change the filter bag.
• In the case of extraction units without a filter bag: clean
the filter.
• Change the fine filter.
• When doing so, observe the instructions and the safe-
ty information for the corresponding extraction unit in
order to ensure that changing the fine filter results in as
little dust as possible.
• Disconnect the suction hose at the suction point and
check whether there is a blockage in the suction point;
remove where appropriate.
• Check the suction line at all disconnection points / ser-
vice openings section by section for blockages.
• Check that the outlet nozzle of the SILENT flow sensor
has been fully screwed into the SILENT flow sensor
until stop and that the end bushing of the suction tube
is fully inserted into the outlet nozzle.
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