<2. Handling Cautions>
2-11
IM 01C25F01-01E
• Wiring connection for output signal code Q
(Low Power type) shall follow the diagram
below.
F0213.ai
Three-Wire Connection
Pressure Transmitters
Power Supply
Voltmeter
SUPPLY –
A
+
–
+
–
Four-Wire Connection
Pressure Transmitters
Power Supply
Voltmeter
SUPPLY –
A
+
–
+
–
Note 5. Operation
• Keep the “WARNING” label attached to the
transmitter.
WARNING: AFTER DE-ENERGIZING,
DELAY 5 MINUTES BEFORE OPENING.
WHEN THE AMBIENT TEMP.≥65°C, USE
HEAT-RESISTING CABLE AND CABLE
GLAND ≥90°C.
• Take care not to generate mechanical
sparking when accessing to the instrument
and peripheral devices in a hazardous
location.
Note 6. Maintenance and Repair
• Warning:When maintenance and repair are
performed, confirm the following conditions
and the then perform works.
Confirm the power supply is cut off and
the voltage of power supply terminal is not
supplied.
• Only personnel authorized by Yokogawa
Electric Corporation can repair the
equipment in accordance with the relevant
standards: IEC / EN 60079-19 (Equipment
repair, overhaul and reclamation) and
IEC / EN 60079-17 (Electrical installation
inspection and maintenance); otherwise the
certification will be voided.
Note 7. Specific Conditions of Use
WARNING
• Electrostatic charge may cause an explosion
hazard. Avoid any actions that cause the
generation of electrostatic charge, such as
rubbing with a dry cloth on coating face of
the product.
• In the case where the enclosure of the
Pressure Transmitter is made of aluminium,
if it is mounted in an area where the use of
category 2D apparatus is required, it shall
be installed in such a way that the risk from
electrostatic discharges and propagating
brush discharges caused by rapid flow of
dust is avoided.
• The flame paths differ from the standard
values in EN 60079-1. Repair of the
equipment is only allowed when done
by the manufacturer or an authorised
representative.
• The fasteners used to fasten the transmitter
enclosure onto the sensor capsule is special
fastener, and the property class of it is
A2-50(A4-50) or more.
• For transmitters with a membrane made of
titanium, ignition hazard due to impact and
friction on the membranes shall be avoided.
• Maximum Surface Temperature for dust-proof:
T85°C (Tamb.: –30* to 75°C, Tp.: –30* to 85°C)
* –15°C when /HE is specified.
c. ATEX Intrinsically Safe Type/ATEX
Flameproof Type
EJX/EJA-E Series pressure transmitters with
optional code /KU22 or /V1U1 can be selected
the type of protection ATEX Flameproof,
Intrinsically Safe. Ex ia, or Ex ic for use in
hazardous area.
Note 1. For the installation of this transmitter,
once a particular type of protection is
selected, any other type of protection
cannot be used. The installation must be in
accordance with the description about the
type of protection in this user’s manual.
