Yokogawa EJX210B - Manual (Page 10)

<2. Handling Cautions>
2-2
IM 01C27C01-01EN
2.4 Selecting the Installation
Location
The transmitter is designed to withstand severe
environmental conditions. However, to ensure
that it will provide years of stable and accurate
performance, take the following precautions when
selecting the installation location.
(a) Wireless Communication
NOTE
The installation location of this transmitter must
meet the following conditions:
- Adjust the direction of the antenna to be
in the upright position regardless of the
orientation of this transmitter. See section 4
for adjusting the antenna.
- Install the transmitter at least 1.5m above
the ground or floor.
F0203.ai
at least
1.5m
- Ensure that there are no obstacles such as
walls or pipes within a 30-cm radius of each
antenna.
- Confirm that each field wireless equipment
compliant with ISA100.11a can see the
antenna of other devices which locate within
its own communication range. In the star
topology network, the visibility to the antenna
of gateway is a mandatory clause.
(b) Ambient Temperature
Avoid locations subject to wide temperature
variations or a significant temperature gradient.
If the location is exposed to radiant heat from
plant equipment, provide adequate thermal
insulation and/or ventilation.
(c) Ambient Atmosphere
Do not install the transmitter in a corrosive
atmosphere. If this cannot be avoided, there
must be adequate ventilation.
(d) Shock and Vibration
Although the transmitter is designed to be
relatively resistant to shock and vibration, an
installation site should be selected where this is
kept to a minimum.
(e) Installation of Explosion-protected Transmitters
An explosion-protected transmitters is
certified for installation in a hazardous area
containing specific gas types. See subsection
2.8 “Installation of an Explosion-Protected
Transmitters.”
2.5 Pressure Connection
WARNING
• Never loosen the process connector bolts
and flange bolts when an instrument is
installed in a process. The device is under
pressure, and a loss of seal can result in a
sudden and uncontrolled release of process
fluid.
• When draining toxic process fluids that have
condensed inside the pressure detector,
take appropriate steps to prevent the contact
of such fluids with the skin or eyes and the
inhalation of vapors from these fluids.
The following precautions must be observed
in order to safely operate the transmitter under
pressure.
(a) Make sure that all the process connector bolts
are tightened firmly.
(b) Make sure that there are no leaks in the impulse
piping.
(c) Never apply a pressure higher than the
specified maximum working pressure.