Technical information

IM-P343-29 CH Issue 5 55

10. Maintenance

10.1 Air supply quality

As stated in Section 5.4, it is important for correct operation of the SP200

positioner that good quality air is supplied.

It is therefore recommended that a Spirax Sarco MPC2 filter regulator or

equivalent is fitted on the air supply to the positioner. In addition the

SP200 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 SP200 housing using a 5 mm allen key

(refer to Figure 48).

The replacement filter plug can now be fitted:

- Fit the 'O' ring (4) and filter (3) onto the filter plug (1) (refer to Figure 49).

- Finally fit the retaining screw (2).

The filter plug can now be replaced into the SP200 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. 49

Fig. 48

Filter plug (1)