DeNOx
6.1 Maintaining the filter element
The probes feature a particle filter which needs to be changed as it becomes dirty.
To do so, disconnect the voltage supply and if applicable close the shut-off valve to the process or switch off the process.
CAUTION! Do not damage the rear filter seat.
NOTICE
Ceramic filter elements are very brittle by nature. Handle them with care, don’t let them fall.
Filter elements made out of sintered stainless steel can be cleaned in an ultrasonic bath and be used several times as long as
both seals are still in proper conditions.
6.1.1 Replacing the outlet filter
• Unlock and lift up the weather hood.
• Turn the handle at the rear end of the probe by 90° (handle must be horizontal), pushing in slightly, and remove.
• Remove the dirty filter element and check the sealing surfaces.
• Before attaching the new filter element, replace the seal at the handle plug (seal included with the filter element).
• Then insert the handle with the new filter and turn 90° (handle must be vertical), pushing in slightly. Pull on the handle to
verify the filter element is firmly seated.
• With the filter removed, you may also clean the inside of the sampling tube if necessary by blowing it out or using a clean-
ing wand.
NOTICE
The weather hood can only be closed again when the handle is completely vertical. In order to do so, loosen the hood from the
locking supports by lifting slightly and then fold down. Ensure that the hood lock clicks into place correctly.
6.2 Replacing the glass pearl receptacle
CAUTION
Hot surface
Risk of burns on the anti-freeze protection heating
Allow the heating to cool down before performing maintenance.
• Close the gas supply.
• Switch off and unplug the device.
• Loosen the 4 screws at the maintenance cover and remove the cover.
• Remove the lines from the glass pearl receptacle.
• Loosen hinged clamp at the adapter and carefully revome the glas vessel.
• Replace / clean glass perls and/or glas vessel.
• If necessary, replace the gasket.
• Re-mount the glas vessel in reverse order.
• Reconnect the lines carefully and properly. Check that there are no leaks!
• Secure the maintenance cover with 4 screws.
• Reconnect to power.
6.3 Replacing the hose of the peristaltic pump
• Turn off gas supply.
• Disconnect the device from the power supply.
• Loosen the 4 screws at the maintenance cover and remove the cover.
• Remove the supplying and draining hoses from the pump (Take care of the safety instructions!).
• Loosen the centre knurled screw but do not remove it. Push the screw aside.
• Pull off the cover.
• Pull the connections sidewards and remove the hose.
• Replace the hose (Bühler spare part) and remount the pump in reverse order.
• Secure the maintenance cover with 4 screws.
• Reconnect power supply and gas supply.
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Bühler Technologies GmbH
BX460035 ◦ 08/2017
