Yokogawa digitalYEWFLO (DY) - Manual (Page 157)

<14. EXPLOSION PROTECTED TYPE INSTRUMENT>
14-6
IM 01F06A00-01EN
(5) Installation Diagram
Intrinsically Safe (and WARNING)
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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
Class I, II, III, Division 1,
Groups A, B, C, D, E, F and G,
and Class I, Zone 0, Group IIC
Non Hazardous
Location
DYC: Signal cable
(*1) Wire for T terminal
With temperature sensor type : installed
Without temperature sensor type: not installed
Electrical parameters of vortex flowmeter (DY) and vortex flow
converter (DYA).
Vmax=30V Imax=165mA Pi=0.9W
Ci=12nF
Li=0.15mH
Installation requirement between flowmeter, converter and
Safety Barrier
Vt or Voc ” Vmax It or Isc ” Imax Po ” Pi
Ca • Ci+Ccable
La • Li+Lcable
Vt, Voc, It, Isc, Voc, Ca and La are parameters of barrier.
WARNING
• In any safety barrier used output current
must be limited by a resistor ‘R’ such that
Isc=Voc/R.
• Any Single FM Approved Barrier of multiple
barriers FM Approved for this confi guration
who’s parameters meet the above
installation requirements.
• Input voltage of the safety barrier must be
less than 250Vrms/Vdc.
• Installation should be in accordance with
National Electrical Code, ANSI /NFPA70.
• Dust-tight conduit seal must be used when
installed in class II and III environments.
• Do not alter drawing without authorization
from FM.
Nonincendive (and WARNING)
Hazardous Location Non Hazardous
Location
Class I, II, Division 2,
Groups A, B, C, D, F and G,
Class III, Division 1, and
Class I, Zone 2, Group IIC
[Integral type]
[Remote type]
DY (flowmeter)
SUPPLY
PULSE
+ +
–
+
–
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–
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–
+
–
Power
Supply
Receiver
DY (converter) DY-N (flowmeter)
SUPPLY
PULSE
+ +
–
+
–
+
–
+
–
+
–
Power
Supply
Receiver
A
B
T
C
A
B
T (*1)
DYC: Signal cable
(*1) Wire for T terminal
With temperature sensor type : installed
Without temperature sensor type: not installed
Non-incendive field wire parameters of vortex flowmeter (DY)
and vortex flow converter (DYA).
Vmax=30V
Imax=165mA Pi=0.9W
Ci=12nF Li=0.15mH
Installation requirement between flowmeter, converter and
general purpose equirement.
Vt or Voc ” Vmax It or Isc ” Imax Po ” Pi
Ca • Ci+Ccable La • Li+Lcable
Vt, Voc, It, Isc, Po, Ca and La are nonincendive field
wire parameters of general purpose equipment.
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WARNING
• The general purpose equipment must be
FM approved with Nonincendive fi eld wiring
parameter which meet the above installation
requirements.
• Installation should be in accordance with
National Electric Code, ANSI/NFPA70.
• Dust-tight conduit seal must be used when
installed in class II and III environments.
• Do not alter drawing without authorization
from FM.