Transmitter Housing Rotation; Integral Display Rotation; Display Removal; Impulse Piping Connection For Standard Instruments - ABB 266 HART Series Operating Instruction

5.7 Transmitter housing rotation

To improve field access to the wiring or the visibility of the
optional LCD meter, the transmitter housing may be rotated
through 360° and fixed in any position. A stop prevents the
housing from being turned too far. In order to proceed with
housing rotation, the housing stop tang-screw has to be
unscrewed by approximately 1 rotation (do not pull it out) and,
once the desired position has been reached, retightened.
Figure 25: Housing rotation

5.8 Integral display rotation

In case an optional integral display meter is installed, it is
possible to mount the display in four different positions rotated
clockwise or counterclockwise with 90° steps. To rotate the
LCD, simply open the windowed cover (Hazardous area
prescriptions must be respected), pull-out the display housing
from the communication board.. Reposition the LCD connector
according to the new desired position. Push back the LCD
module on the communication board. Be sure that the 4 plastic
fixing locks are properly in place.
Figure 26: Display rotation

5.9 Display removal

To remove the LCD it is necessary to gently grab the entire
component from the lower plastic as shown by the picture here
below.
Figure 27: Grabbing area for display removal
In case of LS display the removal procedure requires a specific
grabbing tool included within spare units, codified with
DR3071/DR3072
Figure 28: Grabbing area for LS display removal
5.10 Impulse piping connection for standard
instruments
In order for the pipes to be laid correctly, the following points must
be observed:
— The measuring pipes must be as short as possible and free
from sharp bends.
— Lay the impulse piping in such a way that no deposits
accumulate in them. Gradients should not be less than
approx. 8% (ascending or descending).
— The measuring pipes should be blown through with
compressed air or, better yet, flushed through with the
measuring medium before connection.
— Where a fluid/vaporous measuring medium is being used,
the liquid in both measuring pipes must be at the same
level. If a separating liquid is being used, both measuring
pipes must be filled to the same level (266Dxx and 266Mxx).
— Although it is not absolutely necessary to use balancing
vessels with vaporous measuring media, measures must be
taken to prevent steam entering the measuring chambers of
the measuring equipment (266Dxx and 266Mxx).
— It may be necessary to use condensate vessels, etc., with
small spans and vaporous measuring media (266Dxx and
266Mxx).
— If using condensate vessels (steam measurement), you
should ensure that the vessels are at the same elevation in
the differential pressure piping (266Dxx and 266Mxx).
— As far as possible, keep both impulse lines at the same
temperature (266Dxx and 266Mxx).
— Completely depressurize the impulse lines if the medium is a
fluid.
— Lay the impulse lines in such a way that gas bubbles (when
measuring fluids) or condensate (when measuring gases)
can flow back into the process line.
— Ensure that the impulse lines are connected correctly (High
and Low pressure sides connected to measuring
equipment, seals...).
— Make sure the connection is tight.
— Lay the impulse line in such a way that prevents the medium
from being blown out over the measuring equipment.
Caution. Process leaks may cause harm or result in death. Install
and tighten process connectors and all accessories (including
manifolds) before applying pressure. In case of toxic or otherwise
dangerous process fluid, take any precautions as recommended in
the relevant Material Safety Data Sheet when draining or venting.
Use only a 12 mm (15/32") hexagonal spanner to tighten the
bracket bolts.
2600T Series Pressure transmitters | OI/266/HART-EN Rev. M 23
5 Mounting