VEGA D77 Hydrostatic pressure transmitters - Manual (Page 13)

Pressure transmitters D76 and D77 13
1) Air permeable and moisture-blocking
2) Cable length 5 m (supplied cable)
3.2 Compensation of the atmos-
pheric pressure
On instruments for gauge pressure meas-
urement, the atmospheric pressure is com-
pensated in different ways, depending on the
pressure transmitter version.
Pressure transmitters with housing
- via an integrated breather facility below the
cable entry (PTFE insert 1) ), protection
IP 66
- via the capillary tubes of the special ca-
ble 2) , used with the pressure transmitter,
protection IP 67
Pressure transmitters with direct cable
outlet
- via the capillary tubes of the connected
special cable 2) , protection IP 68
External housing VEGABOX 01
We recommend leading the special cable to
the external housing VEGABOX 01 (acces-
sory) and carrying out the pressure compen-
sation via the integrated breather facility.
Keep the following instructions in mind:
- the same atmospheric pressure as on the
pressure transmitter must also be present
on the external housing VEGABOX 01
- the pressure compensation must be made
in a dry environment
- for vertical wall mounting, the cable entries
must point downwards to avoid moisture
ingress.
Mounting
3 Mounting
3.1 Mounting instructions
Cable entry
The pressure transmitters 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 connection, must be
used for mounting. This seal is either sup-
plied with the pressure transmitter or must be
provided by the customer.