Yokogawa EJA220A - Manual (Page 21)

IM 01C21C01-01E 4-1
4. INSTALLATION
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.”
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 installa-
tion.
• Never loosen the four screws securing the
cover flanges (if the seal liquid leaks, the
transmitter cannot be used).
4.2 Mounting
The transmitter is mounted on a process using its high-
pressure side flange as shown in Figure 4.1. The
customer should prepare the mating flange, gasket, stud
bolts and nuts.
Gasket
Stud bolt
Nut
F0401.EPS
Figure 4.1 Transmitter Mounting
IMPORTANT
Please use a gasket which has a bigger inside
diameter than that of gasket facing (ød) on
diaphragm seal. In case a gasket which has a
smaller inside diameter than that of gasket
facing is used, it may cause an error as the
gasket prevents diaphragm from working cor-
rectly. (Refer to Subsection 10.4 ‘Dimensions’)
4.3 Rotating Transmitter Section
The DPharp transmitter section can be rotated in 90 °
segments.
(1) Remove the two Allen screws that fasten the
transmitter section and pressure-detector section,
using the Allen wrench supplied with the transmit-
ter.
(2) Rotate the transmitter section slowly in 90 ° seg-
ments.
(3) Tighten the two Allen screws.
IMPORTANT
Do not rotate the transmitter section more than
180°.
F0402.EPS
Rotate 90° or 180° segments
Transmitter section
Pressure-detector section
Conduit connection
Zero-adjustment screw
Figure 4.2 Rotating Transmitter Section