28
Installation
8.4 Pneumatic connection
DANGER!
Danger – high pressure in the equipment!
▶ Beforelooseningthelinesandvalves,turnothepressure
andventthelines.
WARNING!
Risk of injury from unsuitable connection hoses!
Hoseswhichcannotwithstandthepressureandtemperature
rangemayresultinhazardoussituations.
▶ Useonlyhoseswhichareauthorizedfortheindicatedpres-
sureandtemperaturerange.
▶ Observethedatasheetspecicationsfromthehose
manufacturers.
For control function I – Danger if pilot pressure fails!
ForcontrolfunctionIcontrolandresettingoccurpneumati-
cally.
Ifthepressurefails,nodenedpositionisreached.
▶ Toensureacontrolledrestart,rstpressurizethedevicewith
pilotpressure,thenswitchonthemedium.
Thepneumaticconnectionoftheangle-seatcontrol
valvecanbecarriedoutonlyinconnectionwiththe
appropriatecontrolunit.
Possiblecontrolunitsare:
PositionerType8692,8694and8696
ProcesscontrollerType8693
8.4.1 Connection of the control medium
→ Connectthecontrolmediumtothepilotairport(1)
(3–7bar;instrumentair,freeofoil,wateranddust).
→ Fittheexhaustlineorasilencertotheexhaustairport(3)
and,ifavailable,totheexhaustairport(3.1).
Ifusedinanaggressiveenvironment,werecommend
conveyingallfreepneumaticconnectionsintoaneutral
atmospherewiththeaidofapneumatichose.
Pilotairport
Exhaustairport
Additionalexhaustairportonly
withpilot-operatedcontrol
systemforhighairoutput
(actuatorsizeø130)
1
3
3.1
Fig. 23: Pneumatic connection
Control air hose:
6/4mmor1/4"pilotairhosescanbeused.
ApilotairportviaG1/8threadisavailableasanoption.