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(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
2.4 "Installation of Explosion Protected Type
Transmitters."
2.3
Pressure Connection
WARNING
• Instrument installed in the process is under
pressure. Never loosen the process connector
bolts to avoid the dangerous spouting of process
fluid.
• During draining condensate from the pressure
detector section, take appropriate care to avoid
contact with the skin, eyes or body, or inhalation
of vapors, if the accumulated process fluid may be
toxic or otherwise harmful.
The following precautions must be observed in order to
safely operate the transmitter under pressure.
(a) Make sure that 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.
CAUTION
Maximum working pressure of the model EJA120A
differential pressure transmitter is 50 kPa
{0.5 kgf/cm
2
}.
Should the pressure exceed 50 kPa {0.5 kgf/cm
is possible to break the sensor. Proceed with caution
when applying pressure.
2.4
Installation of Explosion
Protected Type
In this section, further requirements and differences and
for explosionproof type instrument are described.
For explosionproof type instrument, the description in this
chapter is prior to other description in this users manual.
For the intrinsically safe equipment and explosionproof
equipment, in case the instrument is not restored to
its original condition after any repair or modification
undertaken by the customer, intrinsically safe
construction or explosionproof construction is damaged
and may cause dangerous condition. Please contact
Yokogawa for any repair or modification required to the
instrument.
NOTE
For F
OUNDATION
explosion protected type, please refer to manuals in
the attached CD-ROM.
CAUTION
This instrument is tested and certified as intrinsically
safe type or explosionproof type. Please note that the
construction of the instrument, installation, external
wiring, maintenance or repair is strictly restricted, and
non-observance or negligence of this restriction would
result in dangerous condition.
WARNING
To preserve the safety of explosionproof equipment
requires great care during mounting, wiring, and
piping. Safety requirements also place restrictions on
maintenance and repair activities. Please read the
following sections very carefully.
2.4.1 FM Approval
a.
FM Intrinsically Safe Type
Caution for FM intrinsically safe type. (Following
2
}, it
contents refer "DOC. No. IFM012-A12 P.1 and 2.")
Note 1. Model EJA Series pressure transmitters with
optional code /FS1 are applicable for use in
hazardous locations.
• Applicable Standard: FM3600, FM3610, FM3611,
FM3810, ANSI/NEMA250
<2. Handling Cautions>
Fieldbus and PROFIBUS PA
6
IM 01C22A01-01E
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