IM-P343-29 CH Issue 520
Fig. 23
¼" NPT air supply (supply)
¼" NPT air signal to
actuator (output 1)
5.4 Air supply and connections
WARNING: Supply air pressure must not exceed the maximum allowable air pressure of
the actuator. Air connections should be
¼" NPT for air supply (supply) and output signal to
actuator (output 1 and output 2 for double action applications) as shown in Figure 23. The
supply air should be between 1.4 bar g minimum and 6 bar g maximum and be oil and dust
free to IEC 60770. Mains air supply may sometimes contain traces of dirt, rust, water, oil
and other deposits with the potential for contaminating the internals of the positioner. It is
therefore essential that a filter / regulator is fitted in the mains air supply to the positioner.
The filter / regulator should have a coalescing filter such as a Spirax Sarco type MPC2, or
suitable compressed air pipework is used.
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