Operation Manual

<14. EXPLOSION PROTECTED TYPE INSTRUMENT>
14-13
IM 01F06A00-01EN
(2) Wiring
• Explosion proof
WARNING
• All wiring shall comply with Canadian
Electrical Code Part I and Local Electrical
Codes.
• In Hazardous locations, wiring shall be in
conduit as shown in the fi gure.
• A SEAL SHALL BE INSTALLED WITHIN
50cm OF THE ENCLOSURE.
• When the equipment is installed in Division
2, “FACTORY SEALED, CONDUIT SEAL
NOT REQUIRED”.
(3) Operation
• Explosion proof
WARNING
• Note a warning label worded as follows.
Warning: OPEN CIRCUIT BEFORE
REMOVING COVER.
• Take care not to generate mechanical
spark when access to the instrument and
peripheral devices in hazardous locations.
(4) Maintenance and Repair
WARNING
• The instrument modifi cation or part
replacements by other than authorized
representatives of Yokogawa Electric
Corporation are prohibited and will void CSA
Certifi cation.
(5) Installation Diagram Intrinsically Safe
(and Note)
Intrinsically safe
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[Remote type]
DYA (converter)
SUPPLY
PULSE
A
B
T (*1)
C
A
B
T
DY (flowmeter)
SUPPLY
PULSE
Safety barriers
Safety barriers
[Integral type]
DY-N (flowmeter)
Hazardous Location
Group IIC, Zone 0
Class I, II, III, Division 1,
Groups A, B, C, D, E, F and G
Non Hazardous
Location
DYC: Signal cable
(*1) Wire for T terminal
With temperature sensor type : installed
Without temperature sensor type: not installed
F1409.ai
Electrical parameters of vortex flowmeter (DY) and vortex flow
converter (DYA).
Ui (Vmax)=30 V Ii (Imax)=165 mA Pi (Pmax)=0.9W
Ci=12 nF Li=0.15 mH
Installation requirements between flowmeter, converter and
Safety Barrier
Uo  Ui Io  Ii Po  Pi Co  Ci+Ccable
Lo  Li+Lcable
Voc  Vmax Isc  Imax Ca  Ci+Ccable
La  Li+Lcable
Uo, Io, Po, Co, Lo, Voc, Isc, Ca and La are parameters of
barrier.
WARNING
• In any safety barrier used output current
must be limited by a resistor ‘R’ such that
Io=Uo/R or Isc=Voc/R.
• The safety barrier must be CSA certifi ed.
• Input voltage of the safety barrier must be
less than 250Vrms/Vdc.
• Installation should be in accordance with
Canadian Electrical Code Part I.
• Dust-tight conduit seal must be used when
installed in class II and III environments.
• Do not alter drawing without authorization
from CSA.