Venting / Draining Transmitters Without Diaphragm Seals; Mounting Position - ABB 2600T Series Operating Instruction

8.3 Venting / draining transmitters without diaphragm
seals
1
Fig. 4
1 Valve on the process axis | 2 Flange side valve on top |
3 Flange side valve on the bottom
For transmitters without diaphragm sealers the following
instructions on venting and draining must be complied with.
It is important to attach the transmitter in such a manner and
to layout the process line in such a manner that gas bubbles in
liquid measurements can be routed back into the process and
not get in to the measuring chambers.
The optional vent / drain valves on the transmitter are attached
on the measuring cell flanges. Align the transmitter so that
these vent / drain valves are arranged above the tap points for
liquid measurement, so that gas can escape upward. For gas
measurements align the transmitter so that the vent / drain
valves are arranged below the tap points, so that air or
condensate can drain.
DANGER - severe health impairments / life-
threatening danger due to escaping
measurement medium!
During the venting or draining process medium
that is being discharged can escape and
endanger personnel who are not working in the
vicinity.
Consequently when venting or draining, any
escaping process medium must be collected.
Change from two to one column
14 OI/266CXX/266JXX/HART-EN Rev. B | 266CRx, 266JRx, 266CSx, 266JSx
2 3
M10797
8.4

Mounting position

The transmitter can be attached directly on a valve manifold
provided for flange installation.
Optionally a fastening bracket for wall or pipe installation
(2" pipe) is available as an accessory.
For models 266CRx and 266JRx fastening brackets must
always be used.
Ideally the transmitter must be mounted in such a manner that
the separating diaphragms are standing vertical, to avoid later
zero point offsets.
IMPORTANT (NOTICE)
If the transmitters are mounted with an inclination
that is not vertical, the filling fluid exerts
hydrostatic pressure on the measuring
diaphragm, which causes a zero point offset. In
this case the zero point can be adjusted via the
zero point button or with the command "Install
position correction". See chapter "Configuration".