Samson TROVIS 3730-3 Mounting And Operating Instructions page 73

Mounting and start-up
Note
The adapter uses one of the M20x1.5 con-
nections in the housing which means only
one cable gland can be installed.
Should other valve accessories be used
which vent the actuator (e.g. solenoid valve,
volume booster, quick exhaust valve), this ex-
haust air must also be included in the purg-
ing function. The connection over the adapt-
er at the positioner must be protected with a
check valve (e.g. check valve G ¼, order no.
8502-0597) mounted in the piping. Other-
wise the pressure in the positioner housing
would rise above the ambient pressure and
damage the positioner when the exhausting
components respond suddenly.
EB 8484-3 EN 73