Yokogawa EJA110A - Manual (Page 24)

IM 01C21B01-01E 4-3
4 . INSTALLATION
4.4 Swapping the High/Low-
pressure Side Connection
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 a Allen wrench (JIS B4648, nominal 5 mm) to
remove the two Allen screws 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 Allen screws to fix the pressure-
detector section and transmitter section together (at
a torque of 5 N·m).
IMPORTANT
Do not rotate the pressure-detector section
more than 180
°
.
F0405.EPS
Pressure-detector Section
Allen screw
Before After rotating 180 °
Figure 4.4 Before and After Modification
4.4.2 Using the BRAIN TERMINAL BT200
This method is applicable only to the Model EJA110A-
ᮀL, EJA110A-ᮀM, EJA110A-ᮀH, EJA120A-ᮀE,
EJA130A-
ᮀM and EJA130A-ᮀH.
With a BRAIN TERMINAL, 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 ‘D45: H/L SWAP’ 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 4.5 Input/Output Relationship
IMPORTANT
Since the H/L label plate on the capsule assem-
bly will remain unchanged even if this function is
used, use this function only if you cannot switch
the impulse piping. If the ‘D45: H/L SWAP’
setting is changed, the input/output relationship
is reversed as shown in Figure 4.5; be sure this
is understood by all. Whenever possible, use
the procedure in Subsection 4.4.1.