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IM 1F6A0-01E
9-2
9. EXPLOSION PRTECTED TYPE INSTRUMENT
9.1.2
Installation
WARNING
• All wiring shall comply with local installation
requirements and local electrical code.
• Suitable heat-resisting cables shall be used for
the YEWFLO Model DY Series Vortex Flowme-
ter when the ambient temperature exceeds
+70
°
C and/or the process temperature exceeds
135
°
C.
• The cable entry devices shall be certified in
type of protection flame proof enclosure “d” and
suitable for the conditions of use and correctly
installed.
• Unused apertures shall be closed with certified
blanking elements in type of protection flame
proof enclose “d”.
9.1.3
Operation
WARNING
• Wait 10 min. after power is turned off, before
opening the covers.
• Take care not to generate mechanical spark
when access to the instrument and peripheral
devices in hazardous locations.
9.1.4
Maintenance and Repair
WARNING
• The instrument modification or parts replace-
ment by other than authorized representative of
Yokogawa Electric Corporation is prohibited
and will void the certification.
9.1.5
Installation Diagram Intrinsically
safe (and Note)
DY (Integral)
SUPPLY
PULSE
Safety barriers
[Integral type]
[Remote type with built-in Temperature sensor]
DYA (converter)
SUPPLY
PULSE
A
B
T
C
A
B
T
Safety barriers
DY-N (Remote)
DYC: Signal cable
Note: In any safety barrier used output current must be limited
by a resistor ‘R’ such that Io=Uo/R
Electric data:
Supply and Output Circuit (SUPPLY
and
, PULSE
and
)
Maximum Input Voltage Ui: 30V
Maximum Input Current Ii: 165mA
Maximum Input Power Pi: 0.9W
Internal Capacitance Ci: 6nF
Internal Inductance Li: 0.15mH
Hazardous
Non Hazardous
Location
[Remote type without built-in Temperature sensor]
DYA (converter)
SUPPLY
PULSE
A
B
T
C
A
B
T
Safety barriers
DY-N (Remote)
DYC: Signal cable
Hazardous
Non Hazardous
Location
Hazardous
Non Hazardous
Location
F090105.EPS