Yokogawa EJX430B - Manual (Page 22)

<4. Installation>
4-3
IM 01C27B01-01EN
4.3 Changing the Process
Connection
The transmitter is shipped with the process
connection specified at the time of ordering. To
change the process connection, the drain (vent)
plug must be repositioned.
To reposition a drain (vent) plug, refer to Figure 4.4
and use a wrench slowly and gently to unscrew
it. Then, remove and remount it on the opposite
side. Wrap sealing tape around the drain (vent)
plug threads (*1 in the figure below), and apply a
lubricant to the threads of the drain (vent) screw(s)
(*2 below). To tighten the drain (vent) plugs, apply
a torque of 34 to 39 N·m (3.5 to 4 kgf·m). Process
connector bolts are to be tightened uniformly to a
torque shown in table 4.1.
Table 4.1 Torque
Model
EJX110B
EJX310B
EJX430B
Torque(N·m)
{kgf·m}
39 to 49 {4 to 5}
F0404.ai
Drain/vent plug
Vertical impulse piping type
Horizontal impulse piping type
Note: For a horizontal impulse
piping type, moving the
process connectors from
the front side to the back
cannot be made.
Bolt
Process connector
gasket
1
2
Figure 4.4 Changing Process Connection
4.4 Swapping the High/Low-
pressure Side Connection
IMPORTANT
This section is applicable only for EJX110B
differential transmitters, and not applicable for
gauge or absolute pressure transmitters.
4.4.1 Rotating Pressure-detector Section
180°
This procedure can be applied only to a transmitter
with a vertical impulse piping type.
The procedure below can be used to turn the
pressure detector assembly 180°. Perform
this operation in a maintenance shop with the
necessary tools laid out and ready for use, and then
install the transmitter in the field after making the
change.
1) Use an Allen wrench (JIS B4648, nominal 2.5
mm) to remove the five setscrews at the joint
between the pressure-detector section and
transmitter section.
2) Leaving the transmitter section in position,
rotate the pressure-detector section 180°.
3) Tighten the five setscrews to fix the pressure-
detector section and transmitter section
together (at a torque of 1.5 N·m).
Reposition the process connector and drain
(vent) plugs to the opposite side as described in
subsection 4.3.
IMPORTANT
Do not rotate the transmitter section more than
above limit.
F0405.ai
Process connector
Setscrew
Before After rotating 180°
Figure 4.5 Before and After Modification