Yokogawa EJA118 - Manual (Page 10)

IM 1C22H1-01E 2-2
2. HANDLING CAUTIONS
2.4 Selecting the Installation
Location
The transmitter is designed to withstand severe
environmental conditions. However, to ensure stable
and accurate operation for years, observe the following
precautions when selecting an installation location.
(a) Ambient Temperature
Avoid locations subject to wide temperature
variations or a significant temperature gradient. If
the location is exposed to radiant heat from plant
equipments, provide adequate thermal insulation
and/or ventilation.
(b) Ambient Atmosphere
Avoid installing the transmitter in a corrosive
atmosphere. If the transmitter must be installed in a
corrosive atmosphere, there must be adequate
ventilation as well as measures to prevent intrusion
or stagnation of rain water in conduits.
(c) Shock and Vibration
Select an installation site suffering minimum shock
and vibration (although the transmitter is designed
to be relatively resistant to shock and vibration).
(d) Installation of Explosion-protected Transmitters
Explosion-protected transmitters can be installed in
hazardous areas according to the types of gases for
which they are certified. See Subsection 2.9
“Installation of Explosion Protected Type Transmit-
ters.”
2.5 Pressure Connection
WARNING
• Instrument installed in the process is under
pressure. Never loosen or tighten the flange
bolts to avoid the dangerous spouting of
process fluid.
• Since the accumulated process fluid may be
toxic or otherwise harmful, take appropriate
care to avoid contact with the skin, eyes or
body, or inhalation of vapors even after dis-
mounting the instrument from process line for
maintenance.
The following precautions must be observed in order to
safely operate the transmitter under pressure.
(a) Never apply a pressure higher than the specified
maximum working pressure.
(b) Never loosen or tighten the bolts securing the
diaphragm seal flanges when the assembly is under
pressure. Do it after releasing the process pressure
if required.
2.6 Waterproofing of Cable
Conduit Connections
Apply a non-hardening sealant to the threads to
waterproof the transmitter cable conduit connections.
(See Figure 5.4.2a, 5.4.2b and 5.4.2d.)
2.7 Restrictions on Use of Radio
Transceiver
IMPORTANT
Although the transmitter has been designed to
resist high frequency electrical noise, if a radio
transceiver is used near the transmitter or its
external wiring, the transmitter may be affected
by high frequency noise pickup. To test for such
effects, bring the transceiver in use slowly from a
distance of several meters from the transmitter,
and observe the measurement loop for noise
effects. Thereafter, always use the transceiver
outside the area affected by noise.