20 Electro-pneumatic positioner TZIDC-110 41/18-77 EN3.2 Pneumatic connection3.2.1 Safety instructions3.2.2 Making the pneumatic connectionsAll pneumatic piping connections are located on the right-hand side of the positioner.Threaded bores G 1/4 or 1/4-18 NPT, respectively, are provided. The positioner islabeled according to the type of thread. The corresponding screwed pipe connectionshave to be supplied by the customer. We recommend pipes with the dimension 6 x 1 mmfor the pneumatic piping.The amount of supply pressure has to be matched to the working pressure necessary forthe actuation. The positioner's operating range is between 1.4 and 6 bar.!WARNING• Observe the accident prevention rules of the Employers Liability Insu-rance Association.• Observe the safety instructions for the pneumatic actuator used. Theactuator's high actuating power may cause injuries !!NOTICE• Take suitable precautions to ensure that even in case of malfunctionsthe positioner’s max. admissible operating pressure of 6 bar (90 psi) isnot exceeded. Otherwise, the positioner and/or the actuator may bedamaged.• The positioner must be supplied with instrument air exempt from oil,water and dust according to DIN/ISO 8573-1, Class 3- Purity: max. particle size 5 μm, max. particle density 5 mg/m 3- Oil content: max. concentration 1 mg/m 3- Pressure dew point: maximum value 10 K below operating temp.3Before connecting the air pipes blow them out to remove dust, splin-ters and other particles.Fig. 15 Pneumatic connectionsFilterOUT 1OUT 2NPT ¼G ¼Pneumatic outputsAir supplyFilter screw plug