Yokogawa EJA110E - Manual (Page 23)

<4. Installation>
4-1
IM 01C25B01-01E
4. Installation
4.1 Precautions
Before installing the transmitter, read the cautionary
notes in section 2.4, “Selecting the Installation
Location.” For additional information on the
ambient conditions allowed at the installation
location, refer to subsection 9.1 “Standard
Specifications.”
IMPORTANT
• When welding piping during construction,
take care not to allow welding currents to
flow through the transmitter.
• Do not step on this instrument after
installation.
• For the EJ430 and EJ440, the
atmospheric opening is located on the low
pressure side cover flange. The opening
must not face upward. See section 9.4,
“Dimensions,” for the location of the opening.
4.2 Mounting
■ The transmitter is shipped with the process
connection, according to the ordering
specifications. To change the orientation of the
process connections, refer to section 4.3.
■ With differential pressure transmitters,
the distance between the impulse piping
connection ports is usually 54 mm (figure 4.1).
By changing the orientation of the process
connector, the dimension can be changed to 51
mm or 57 mm.
■ The transmitter can be mounted on a nominal
50 mm (2-inch) pipe using the mounting
bracket supplied, as shown in figure 4.2 and
4.3 The transmitter can be mounted on either a
horizontal or a vertical pipe.
■ When mounting the bracket on the transmitter,
tighten the (four) bolts that hold the transmitter
with a torque of approximately 39 N·m {4kgf·m}.
57 mm 54 mm 51 mm
F0401.ai
Figure 4.1 Process Connector Impulse Piping
Connection Distances for Differential
Pressure Transmitters
Figure 4.1 and 4.2 shows the mounting of the
transmitter for horizontal piping and vertical piping
with using the mounting bracket. The transmitters
with the installation code -U (Universal flange) can
be used for either type of mounting.
Horizontal pipe mounting
Vertical pipe mounting
Transmitter
mounting bolt
U-bolt nut
Mounting bracket
U-bolt nut
Mounting bracket
50 mm(2-inch) pipe
50 mm(2-inch) pipe
U-bolt
U-bolt
F0402.ai
Transmitter
mounting bolt
Figure 4.2 Transmitter Mounting (Horizontal
Impulse Piping Type)