VEGA D90 Profibus PA - Manual (Page 12)

12 Pressure transmitter D90 (Profibus PA)
Mounting
2 Mounting
2.1 Mounting instructions
The pressure transmitter can be mounted in
any position. Cable entries must point down-
wards to avoid moisture ingress. For this
purpose, the housing can be rotated by 330°
in relation to the mounting part.
A seal, appropriate for the respective con-
nection, must be used for mounting. This seal
is either supplied with the pressure transmit-
ter 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:
- there must generally be the same atmos-
pheric pressure in the breather facility and
on the vessel
- the pressure compensation must be made
in dry environment
- with perpendicular wall mounting, cable
entries must point downward to avoid
moisture ingress and buildup on the
breather facility.
1) air permeable and moisture-blocking