YOKOGAWA DP harp EJX Series - 4 Installation; Precautions; Mounting

<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 informations and
limitationsaccordingtotheselectedmodel,su󰀩x
andoptioncodes,pleasendinformationineach
GeneralSpecicationssheet.
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.
• When installing a process connector, make
sure that no foreign matter has adhered to
the seal surface of the gasket (or O-ring)
before assembly. If foreign matter adheres,
it may lead to leaks. In the case of O-rings,
it is known that the sealing performance can
be improved by applying grease. If grease is
not used, make sure that no foreign matter is
attached.
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di󰀨erential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 Di󰀨erential
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
50 mm(2-inch) pipe
U-bolt
U-bolt
F0402.ai
Transmitter
mounting bolt
Figure 4.2 Transmitter Mounting (Horizontal
Impulse Piping Type)