Mounting; Pressure Transmitter - ABB 261GS Operating Instruction

4

Mounting

Before installing the transmitter, check whether the device
design meets the requirements of the measuring point from a
measurement technology and safety specifications point of
view. This applies in respect of the:
— Measuring range
— Overload resistance
— Temperature
— Explosion protection
— Operating voltage
The suitability of the materials must be checked as regards
their resistance to the media. This applies in respect of the:
— Process connection, separating diaphragm, etc.
In addition, the relevant directives, regulations, standards, and
accident prevention regulations must be observed (e. g.,
VDE/VDI 3512, DIN 19210, VBG, Elex V, etc.).
Measurement accuracy is largely dependent on correct
installation of the transmitter and, if applicable, the associated
impulse line(s).
As far as possible, the measuring setup should be free from
critical ambient conditions such as large variations in
temperature, vibrations, or shocks.
IMPORTANT (NOTICE)
If unfavorable ambient conditions cannot be
avoided for reasons relating to building structure,
measurement technology, or other issues, the
measurement quality may be affected.
(See 'Specifications' chapter).
If a remote seal with capillary tube is installed on the
transmitter, the additional operating instructions for remote
seals and the related data sheets must be observed.
12 IM/261Gx/Ax-EN Rev. 08 | 261Gx, 261Ax
4.1

Pressure transmitter

The pressure transmitter can be connected directly to the
shut-off valve. An angle bracket for wall or pipe mounting (2"
pipe) is also available as an accessory.
The pressure transmitter should be installed so that the
display and control unit are accessible during installation and
connection, as well as retrofitting.
Ideally, the pressure transmitter should be mounted in a
vertical position with the process connection pointing
downward to prevent subsequent zero position shifts.
IMPORTANT (NOTICE)
If the pressure transmitter is installed at an angle,
depending on the measuring range the filling fluid
exerts hydrostatic pressure on the measuring
diaphragm, resulting in a zero position shift.
The zero point must then be adjusted.
However, in principle the pressure transmitter can be used in
any mounting position. It is mounted by following the same
guidelines as for a manometer.
For mounting options with an angle bracket, see the section
"Specifications".