Siemens Simatic CFU Commissioning Manual page 126

Compact Field Unit in the enclosure for use in a hazardous area
11.3 Configuration with SIMATIC CFU PA bundle with aluminum enclosure
Figure 11-4
Excess pressure or low pressure inside the enclosure
The following errors could be responsible for excess pressure or low pressure in the enclosure:
Error
The pressure compensation element is contaminated.
The pressure compensation element is defective.
Additional information
Section "Tools and tightening torques (Page 149)"
126
Position of the pressure compensation element on the aluminum enclosure (view from
below)
Remedy
Clean the pressure compensation element. You can find in‐
formation on this in section "Cleaning (Page 125)".
Replace the pressure compensation element. Pay attention
to the correct mounting.
Commissioning Manual, 07/2018, A5E39252870-AC
SIMATIC CFU