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For installa on in Ex. situa on: refer to special condi ons in Sec on 5 of this manual. Use only Ex. cer fied product
8.2.1.1. Fi ng the control head—Linear actuator
If installing on the F272S actuator, remove and discard the metal O‐Ring retaining plate/cover. Fit the O‐Ring retaining
bush (supplied with the actuator) over the actuator sha , small diameter uppermost, to secure the actuator sha O‐Ring.
1.
Fit the linear target assembly to the sha of the piston valve actuator. Tighten using a Hex key.
2.
The height of the switches have been factory set to operate when used on a F257 1/4 turn actuator, so the Open
switch, which is opposite the solenoid, must be inverted in order to achieve sufficient height adjustment. To do this
turn the switch tower adjus ng screw clockwise un l the switch carrier is flush with the top of the screw. Prise the
holding clip outwards gently un l the switch comes free with a gentle tug. Rotate the switch so the target area is
uppermost and set back into the switch holder, make sure the retaining clip snaps over the switch (see Limit Switch
Se ng below for adjustment procedure).
3.
Locate the Base Gasket on to the step on the top of the actuator or moun ng kit adaptor.
4.
Fit the two Base O‐Rings into the round & oval recesses in the base of the control head, the larger O‐Ring is supplied
round and will need to be worked into its oval recess. DO NOT apply grease, the O‐Rings will be easier to fit and keep
in place if kept dry and not lubricated.
5.
Fit the control head over the target assembly onto the actuator or adaptor plate. Check any moun ng holes do not
foul the Base O‐Rings while orien ng the air ports towards the actuator air ports.
6.
Fasten the Control Head down by means of the two M6 socket head cap screws. Torque down to 3.5 NM.
7.
Connect the air lines from the actuator to the control head to suit the actuator and valve combina on. Port "B" is live
when the solenoid is de‐energised, the "A" port is live when the solenoid is energised.
8.
Connect the air supply to the Control Head port labelled "IN". If it is safe to do so the actuator can be operated using
the manual override on the solenoid. Check for leaks.
9.
Tighten the cable gland firmly using an appropriate spanner.
8.2.1.2. Limit Switch Se ng
This procedure is simplified if the control head is connected to a power source, as the LED's on the switches (if present) will
indicate. It is best to adjust the switches such that the target is just coming into the switch detec on zone.
1.
Operate the valve to the fully OPEN (up) posi on by opera ng the manual override switch on the pilot valve.
2.
Using a small flat blade screwdriver adjust the switch opposite the solenoid by turning the height adjustment screw,
clockwise raises the switch, an clockwise lowers the switch. If power is not available align the centre of the target
symbol on the switch with the middle of the metal target.
3.
Operate the valve to fully closed (down) posi on. Adjust the switch opposite the terminal block by turning the height
adjustment screw.
4.
Release the manual override if used, before fi ng the cap O‐Ring and screwing the cap firmly down.
Fig 7. Moun ng ‐ Linear Components
Pg 23
F783E Ex‐ia
00‐ISN‐203_Rev B
29/01/2021
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