Yokogawa EJX438B - Manual (Page 19)

<4. Installation>
4-1
IM 01C27H01-01EN
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 10.1 “Standard
Specifications.”
NOTE
To connect this transmitter to the field wireless
network, information on connecting to field
wireless devices needs to be set beforehand.
Refer to 6.4 “Connecting to the Field Wireless
Network.”
IMPORTANT
• When welding piping during construction,
take care not to allow welding currents to
flow through the transmitter.
• Do not step on this instrument after
installation.
• For the EJX438B, there is a small hole in the
low pressure side cover flange that is used to
measure the atmospheric pressure.
The hole must not face upward. See section
10.4, “Dimensions,” for the location of the
hole.
• Never loosen the four bolts securing the
cover flanges (Refer to figure 3.2.) If the seal
liquid leaks, the transmitter cannot be used.
4.2 Mounting the Diaphragm
Seals
Mount the diaphragm seals using the flanges as
shown in Figure 4.1. Figure 4.2 and Figure 4.3
shows how to mount the diaphragm seals on a
tank. The mating flange, gasket, bolts and nuts are
to be procured by the customer.
Nut
Flange
Diaphragm
Ød
Gasket
F0401.ai
Bolt
The product is shipped with
these parts assembled.
Correctly install the diaphragm seals on
the high and low pressure sides of the
process (The label on each diaphragm
seal is marked HIGH or LOW.)
Figure 4.1 Mounting the Diaphragm Seals
IMPORTANT
Please use a gasket with an inside diameter
(ød) that is greater than the diameter of the
diaphragm seal. If a gasket with a smaller
inside diameter is used, the diaphragm may not
function correctly. (Refer to Subsection 10.4
‘Dimensions’)