IM 01C25B01-01E
4-3
4 . INSTALLATION
4.4 Swapping the High/Low-
pressure Side Connection
IMPORTANT
This section is applicable only for EJX110A and
EJX130A 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 two 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 two 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.
F0405.EPS
Process connector
Setscrew
Before
After rotating 180
°
Figure 4.5
Before and After Modification
4.4.2 Using the Communicator
This method is applicable only to the Model EJX110A
and EJX130A.
With a communicator, you can change which process
connection is used as the high-pressure side without
mechanically rotating the pressure-detector section 180
as described in subsection 4.4.1. To change, call
parameter ‘D15: H/L SWAP’ for BRAIN Communica-
tion or ‘H/L swap’ for HART Communication and
select REVERSE (right side: low pressure; left side:
high pressure) or select NORMAL to change back to
normal (right side: high pressure; left side: low
pressure).
Output
Input
NORMAL
REVERSE
F0406.EPS
Figure 4.6
Input/Output Relationship
IMPORTANT
Since the H/L label plate on the capsule assem-
bly will remain unchanged, use this function only
when you cannot switch the impulse piping. If
the ‘H/L SWAP’ parameter setting is changed,
the input/output relationship is reversed as
shown in figure 4.6; be sure this is understood
by all. After reversing the setting, modify the H/L
label plate to clearly indicate this change.
