IM-P343-37 CTLS Issue 4
40
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TRANSLATION RUN OVER
SP400 Electropneumatic Smart Positioner
10.1 Air supply quality
It is important for correct operation of the SP400 positioner that good quality air is supplied.
It is therefore recommended that a Spirax Sarco coalescing filter regulator or equivalent is fitted on the air
supply to the positioner. In addition the SP400 positioner has an internal filter. In normal operation it is
recommended that this filter is replaced every 6 to 12 months depending on the air quality and valve usage.
A spare filter plug kit can be obtained from Spirax Sarco that includes: filter plug, plus 3 off 'O' rings and filter.
10.2 Fitting replacement filter plug kit
To change the filter proceed as follows:
-
Ensure that the air supply to the positioner is isolated.
-
Unscrew the filter plug (1) from the SP400 housing using a 5 mm hex. head socket key (refer to
Figure 44).
The replacement filter plug can now be fitted:
-
Fit the 'O' ring (4) and filter (3) onto the filter plug (1) (refer to Figure 45).
-
Finally fit the retaining screw (2).
The filter plug can now be replaced into the SP400 housing, checking that the 'O' ring (4) is correctly located.
The pnuematic air supply can now be restored to the positioner and checks made to ensure that the filter
plug 'O' ring has provided the neccesary air tight seal.
Fig. 45
Fig. 44
Filter plug (1)
2
3
4
1
10. Maintenance
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