IM 01C25H01-01E
4-1
4. INSTALLATION
4.
INSTALLATION
4.1 Precautions
䊏
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 8.1 “Standard Specifi-
cations.”
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.
• For the EJX438A, 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
8.4, “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 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.EPS
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 dia-
phragm seal. If a gasket with a smaller inside
diameter is used, the diaphragm may not func-
tion correctly.
(Refer to Subsection 8.4 ‘Dimensions’)
IMPORTANT
• When measuring the liquid level of the tank,
the minimum liquid level (zero point) must be
set to a level at least 50 mm above the center
of the high pressure side diaphragm seal (see
Figure 4.2).
• Correctly install the diaphragm seals on the
high and low pressure sides of the process,
checking the label on each seal.
• To avoid measuring error duets temperature
difference between the two diaphragm seals,
capillary tube must be bound together. The
capillary tube must be securely fixed to the
tank wall to prevent movement by wind or
vibration. If the capillary tube is too long,
loosely coil the extra tube portion (coil diam-
eter of 300 mm or more) and secure the
coiled tube with a clamp.
• 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 dia-
phragm.
• Do not sharply bend or twist capillary tube or
apply excessive stress to them.
