YOKOGAWA EJX Series, User Manual

Page: 20 / 52

<3. Installation>
18
IM 01C25A01-01E
3. Installation
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 EJ

430

, EJ

440

and EJ

438

,
the atmospheric opening is located on the low
pressure side cover flange. For EJ

530

and
EJX630A whose capsule code is A, B, or C, the
pipe of the atmospheric opening is located on the
pressure detecting section. These openings must
not face upward.
F00301.ai
Capsule code
Zero-adjustment screw
Pipe
(backside of the instrument)
6




Figure 3.1 EJ

530

and EJX630A Horizontal
Mounting Position
3.1 Mounting
■ The transmitter can be mounted on a nominal
50 mm (2-inch) pipe using the mounting bracket
supplied, as shown in Figure 3.2 and 3.3. Tighten the
(four) bolts that hold the transmitter with a torque of
approximately 39 N·m {4 kgf·m}.
Transmitter
mounting bolt
U-bolt nut
Mounting bracket
50 mm(2-inch) pipe
U-bolt
F0302.ai
Figure 3.2 Transmitter Mounting
(Horizontal Impulse Piping Type)
Vertical pipe mounting
(Process connector upside)
Transmitter
mounting bolt
Mounting
bracket
U-bolt nut
U-bolt
50 mm
(2-inch) pipe
Vertical pipe mounting
(Process connector downside)
F0303.ai
Figure 3.3 Transmitter Mounting
(Vertical Impulse Piping Type)
Vertical pipe mounting
50 mm
(2-inch) pipe
U-bolt (L)
U-bolt (S)
Mounting
bracket
U-bolt
nut (S)
U-bolt nut (L)
Horizontal pipe mounting
F0304.ai
Figure 3.4 EJ

510

and EJ

530

Mounting
3.2 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.
• During the diaphragm seal installation, ensure as
far as possible that no seal liquid head pressure is
applied to the diaphragm seals.
• Exercise care so as not to damage diaphragm
surfaces. Since the diaphragm protrudes approx.
1 mm from the flange surface, do not place the
pressure detector section face down on a surface
as this can damage the diaphragm.
• Do not sharply bend or twist capillary tube or apply
excessive stress to them.
• Never loosen the four bolts securing the cover
flange or the screws at the joints between the
capillary tube and cover flanges. If the seal liquid
leaks, the transmitter cannot be used.