VEGA D94 Profibus PA - Manual (Page 12)

12 Pressure transmitter D94 (Profibus PA)
Mounting
2 Mounting
2.1 Mounting instructions
The pressure transmitter can be mounted in
any position. Cable entries must point down-
ward to avoid moisture ingress. For this pur-
pose, the housing can be rotated by 330° in
relation to the mounting part.
An appropriate connection seal must be
used for mounting. This seal is either sup-
plied with the pressure transmitter or must be
provided by the customer.
2.2 Compensation of the atmos-
pheric pressure
On instruments for gauge pressure meas-
urement, the atmospheric pressure is com-
pensated via a breather facility integrated in
the housing.
Pressure transmitter with housing
- via an integrated breather facility (PTFE
use 1) ), protection IP 66
- via the capillaries of a special cable con-
nected to the terminals, protection IP 67
Pressure transmitter with direct cable
outlet
- via the capillaries of a special cable con-
nected to the terminals, protection IP 68
We recommend leading a special cable to
the processing unit and carrying out the
pressure compensation via the integrated
breather facility there.
Processing unit
Observe the following instructions:
- as a rule, there must be the same atmos-
pheric pressure on the breather facility as
on the vessel
- the pressure compensation must be made
in dry environment
- with vertical wall mounting, cable entries
must point downward to avoid moisture
ingress and buildup on the breather facility.
1) air permeable and humidity blocking