Burkert Type 8696 - Manual (Page 37)

37
Fluidinstallation
9.3. Pneumatic connection of the positioner
DANGER!
Risk of injury from high pressure!
• Before loosening the lines and valves, turn off the pressure and vent the lines.
Procedure:
→
Connect the control medium to the pilot air port (1)
(3 – 7 bar; instrument air, free of oil, water and dust).
→
Attach the exhaust airline or a silencer to the exhaust air port (3).
Important information for the problem-free functioning of the device:
• The installation must not cause back pressure to build up.
• Select a hose for the connection with an adequate cross-section.
• The exhaust air line must be designed in such a way that no water or other liquid can get into the
device through the exhaust air port.
Pilot air port
(label: 1)
Exhaust air port
(label: 3)
Figure 19: Pneumatic connection
Caution: (Exhaust air concept):
In compliance with protection class IP67, an exhaust air line must be installed in the dry area.
Keep the adjacent supply pressure always at least 0.5 – 1 bar above the pressure which is required to
move the actuator to its end position. This ensures that the control behavior is not extremely negatively
affected in the upper stroke range on account of too little pressure difference.
During operation keep the fluctuations of the pressure supply as low as possible (max. ±10 %). If fluctua-
tions are greater, the control parameters measured with the
X.TUNE function are not optimum.
english
Type 8696