Checking The Air Filter In The Positioner - ABB TZID Operating Instructions Manual

5.3 Checking the air filter in the positioner

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CAUTION
To ensure trouble-free operation make sure that the supply air is free of oil, water and
dust in accordance with DIN/ISO 8573-1 (purity and oil content acc. to class 3, pressure
dew point 10 K below operating temperature).
If the air supplied to the positioner is not clean and dry as specified, the built-in textile fil-
ter can protect the air nozzles and throttles against pollution to a certain degree. How-
ever, the filter capacity only allows for collecting residual dirt for a short time. If polluted
air is supplied for a longer time, the filter is clogged with dirt.
Air outlet
Filter element
Fig. 25 Air filter
Proceed as follows:
1. Switch off compressed air supply.
2. Remove the screw plug retaining the air filter.
3. Remove the filter element using tweezers and check the degree of pollution.
Replace the filter element if required. Spare filter elements can be ordered
from ABB under catalog number 7942511.
4. Insert the filter.
5. Fasten the screw plug again.
6. Switch on compressed air supply.
After filter element replacement the positioner will immediately be operational again and
does not require any additional steps like, for example, readjustment.
42/18-54 EN
Prior to working on the air filter, always switch off compressed air supply.
Screw plug
Electro-pneumatic positioner TZID
Air inlet
37