Bray 6A Series O&M Manual - Manual (Page 29)

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The technical data herein is for general information only. Product suitability should be based solely upon customer’s detailed knowledge and experience with their application.
Series 6A Operation & Maintenance – Service and Maintenance
6A O & M : 29
ServICe AnD MAInTenAnCe
The S6A is maintenance-free to a large extent. Screens are
installed in the pneumatic connections of the positioners to pro-
tect them from debris. If there are dirt particles in the pneumatic
auxiliary power supply, they damage the screens and hamper the
function of the positioner.
Perform the following steps when needing to clean the screens:
Cleaning the Screens
Q
CAutIoN
Danger Positioner in the plastic enclosure:
Risk of explosion due to electrostatic charge. Electrostatic
charges develop when cleaning the positioner in the plastic
enclosure with a dry cloth. It is imperative you avoid electro-
static charges in the hazardous environment.
1. Disconnect the pneumatic power supply.
2. Remove the lines.
3. Unscrew the cover.
4. Unscrew the three self-tapping screws on the pneumatic
terminal strip.
5. Remove the screens and O-rings behind the terminal strip.
6. Clean the screens, e.g. using compressed air.
Installation of the Screens
Q
CAutIoN
Damage to the enclosure. The enclosure is damaged due to
screwing in the self-tapping screws improperly. Ensure that the
available thread pitches are used. Turn the screws counterclock-
wise until they engage noticeably in the thread pitch. Tighten
the self-tapping screws only after they have engaged.
1. Insert the screens into the recesses of the plastic enclosure.
2. Place the O-rings on the screens.
3. Fit the pneumatic terminal strip on both studs so that it fits
flushly.
4. Screw-on the three self-tapping screws.
5. Place the cover and tighten it.
6. Reconnect the pipelines and feed the pneumatic power
supply