17
4 Mounting
WIKA Operating Instructions - Process pressure transmitter CPT-2x
4.2 Instructions for oxygen applications
Oxygen and other gases can be explosive when brought into contact
with oils, grease and plastics, so the following measures must also be
taken:
•
All components of the system, e.g. measuring instruments, must
be cleaned in accordance with the requirements of recognized
regulations or standards
•
Depending on the seal material, certain temperatures and pres-
sures must not be exceeded in oxygen applications, see chapter
"
Technical data
"
Danger:
Instruments for oxygen applications must be unpacked just before
mounting. After removing the protective cover of the process fitting,
the label "O
2
" will be visible on the process fitting. Penetration of oil,
grease and dirt should be avoided. Danger of explosion!
4.3 Ventilation and pressure compensation
The filter element in the electronics housing has the following func-
tions:
•
Ventilation of the electronics housing
•
Atmospheric pressure compensation (with relative pressure meas-
uring ranges)
Caution:
The filter element causes a time-delayed pressure compensation.
When quickly opening/closing the housing cover, the measured value
can change for approx. 5 s by up to 15 mbar.
For an effective ventilation, the filter element must be always free from
buildup. In case of horizontal mounting, turn the housing so that the
filter element points downward after the instrument is installed. This
provides better protection against buildup.
Caution:
Do not use a high-pressure cleaner. The filter element could be dam-
aged, which would allow moisture into the housing.
The following paragraphs describe how the filter element is arranged
in the different instrument versions.
Oxygen applications
Filter element - Function
