Yokogawa EJA110E User Manual download pdf (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

Specications.”

IMPORTANT

• When welding piping during construction,

take care not to allow welding currents to

ow 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 ange. 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

specications. 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 (gure 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 gure 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 ange) 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

U-bolt

F0402.ai

Transmitter

mounting bolt

Figure 4.2 Transmitter Mounting (Horizontal

Impulse Piping Type)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 84 85

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