Buhler GAS 222.21 Ex2, Инструкция по установке и эксплуатации

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GAS 222.21 Ex2
CAUTION Drive pressurised
Never loosen or remove the cover or any accessories with the drive pressurised.
CAUTION Never open the drive with the function “single-acting”!
This may only be done at the manufacturer’s plant.
CAUTION Do not attach levers or tools to the drive’s spindle!
Levers and tools on the spindle can flap around when switching the compressed air or
control voltage back on and cause serious injury or damage!
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 back end of the probe by 90° (handle must then be horizontal), pushing in slightly, and remove.
– Remove the dirty filter element and check the sealing surfaces.
– Before installing the new filter element, replace the seal on the handle plug (seal included with the filter element). When
changing the seals in low temperatures the temperature limits must particularly be observed (see “Spare Parts and Accessor-
ies”)
– Then carefully insert the handle with new filter, push in slightly and turn 90° (handle must then be vertical). Pull on the
handle to verify the filter element is firmly seated.
– With the filter removed, if necessary also need clean the inside of the sampling tube by blowing it out or using a cleaning
wand.
NOTICE
The weather hood can only be closed again when the handle is completely vertical. In or-
der 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.
6.1.2 Replacing the Inlet Filter
The probe can be equipped with both an inlet filter as well as an outlet filter. When sampling flammable gases, nitrogen (inert
gas) must be used for blowback. Blowback of explosive gases is prohibited.
The effectiveness of cleaning a filter within a process is directly influenced by the available airflow (amount of gas). We there-
fore recommend using a pressure vessel directly on the probe.
With sufficient inlet filter blowback (within the process stream) the probes are maintenance-free. However, due to process con-
ditions the filter may clog over time. In this case the filter element will need to be replaced.
To do so, the probe must be completely removed and reinstalled after changing the element. If the probe is equipped with an
outlet filter, it must be replaced.
17 Bühler Technologies GmbH BE460048 ◦ 08/2019