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

266 Models - HART

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 22: Housing rotation

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 23: LCD rotation
22 OI/266/HART-EN Rev. D | 2600T Series Pressure transmitters

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 can
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 (266Dx and 266Mx).
– 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 (266Dx and 266Mx).
– It may be necessary to use condensate vessels, etc., with
small spans and vaporous measuring media (266Dx and 266Mx).
– If using condensate vessels (steam measurement), you
should ensure that the vessels are at the same elevation in the
differential pressure piping (266Dx and 266Mx).
– As far as possible, keep both impulse lines at the same
temperature (266Dx and 266Mx).
– 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, etc.).
– 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.