Yokogawa digitalYEWFLO (DY) - Manual (Page 164)

<14. EXPLOSION PROTECTED TYPE INSTRUMENT>
14-13
IM 01F06A00-01EN
(5) Installation Diagram
Intrinsically Safe
F1410.ai
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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
(Zone 0) Non Hazardous
Location
Non Hazardous
Location
DYC: Signal cable
(*1) Wire for T terminal
With temperature sensor type : installed
Without temperature sensor type: not installed
Electrical parameters:
Ui=30V
Ii=165mA Pi=0.9W
Ci=37nF Li=0mH
Installation Requirements between Flowmeter, Converter and
Safety Barrieres:
Uo ” Ui Io ” Ii Po ” Pi Co • Ci1Ccable
Lo • Li1Lcable
Uo, Io, Co, and Lo are parameters of safety barrier.
Ccable and Lcable are the maximum allowable cable
parameters.
Hazardous Location
(Zone 0)
WARNING
• The safety barrier must be SAA certifi ed.
• Input voltage of the safety barrier must be
less than 250Vrms/Vdc.
• In any safety barriers used the output current
must be limited by a resistor ‘R’ such that
Io=Uo/R.
Type n
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[Remote type]
A
B
T (*1)
C
A
B
T
DY (flowmeter)
[Integral type]
Non Hazardous
Location
Non Hazardous
Location
DYC: Signal cable
(*1) Wire for T terminal
With temperature sensor type : installed
Without temperature sensor type: not installed
SUPPLY
PULSE
SUPPLY
PULSE
Power
Supply
Power
Supply
Receiver
Receiver
DYA (converter) DY-N (flowmeter)
General Purpose
Equipment
General Purpose
Equipment
Hazardous Location
(Zone 2)
Hazardous Location
(Zone 2)
F1411.ai
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WARNING
Output voltage of power supply must not exceed
30Vdc and will void the certifi cation.
(6) Name Plate
Intrinsically safe and Type n
WARNING
• The specifi cations of Intrinsically safe
type and Type n are described (engraved)
on these name plates. For use of SAA,
select a specifi cation either Intrinsically
safe type (Ex ia) or Type n (Ex n), then
erase unnecessary specifi cation at the
customer side.
Once a specifi cation has been selected,
never it can be changed again. (ex. Never
use the fl owmeter as Type n if it has selected
Intrinsically safe type fi rstly.)