Yokogawa EJA115 - Manual (Page 17)

<3. Installation>
15
IM 01C22A01-01E
3. Installation
IMPORTANT
• When welding piping during construction, take
care not to allow welding currents to fl ow through
the transmitter.
• Do not step on this instrument after installation.
• For EJA430A, the atmospheric opening is located
on the low pressure side cover fl ange. For
EJA530A with Measurement span code A, B, and
C, the pipe is attached for the opening. These
openings must not face upward.
F00301.ai
Pipe
(Open to atmosphere)
Zero-adjustment screw
Measurment span code
Figure 3.1 EJA530A 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}.
F0302.ai
Mounting bracket
Transmitter
mounting bolt
Figure 3.2 Transmitter Mounting
(Horizontal Impulse Piping Type)
F0303.ai
Process connector upside Process connector downside
Transmitter
mounting bolt
Mounting
bracket
Figure 3.3 Transmitter Mounting
(Vertical Impulse Piping Type)
U-bolt (S)
F0304.ai
U-bolt nut (S)
Plate
Adapter
U-bolt nut (L)
Mounting bracket
50 mm(2-inch) pipe
U-bolt (L)
Figure 3.4 EJA510A and EJA530A Mounting
3.2 Mounting the Diaphragm
Seals
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 correctly
• During the diaphragm seal installation, ensure as
far as possible that no seal liquid head is applied to
the diaphragm seals.
• Exercise care so as not to damage diaphragm
surfaces. Since the diaphragm protrudes approx.
1mm from the fl ange surface, placing the
diaphragm seals with their diaphragm surfaces
facing downward may damage the diaphragm
surfaces.
• Do not sharply bend or twist capillary tube or apply
excessive stress to them.
• Never loosen the four screws securing the cover
fl ange or the screws at the joints between the
capillary tube and cover fl anges (if the seal liquid
leaks, the transmitter cannot be used).
Installation
3