Wiring; Operation; Maintenance And Repair; Installation Diagram Intrinsically Safe (And Note) - YOKOGAWA DY025 User Manual

10.4.2 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 figure.
• A SEAL SHALL BE INSTALLED WITHIN 50cm
OF THE ENCLOSURE.
• When the equipment is installed in Division 2,
"FACTORY SEALED, CONDUIT SEAL NOT
REQUIRED".

10.4.3 Operation

• Explosion proof
WARNING
• Note a warning label worded as follows.
Warning: OPEN CIRCUIT BEFORE REMOV-
ING COVER.
• Take care not to generate mechanical spark
when access to the instrument and peripheral
devices in hazardous locations.

10.4.4 Maintenance and Repair

WARNING
• The instrument modification or part replace-
ments by other than authorized representatives
of Yokogawa Electric Corporation are prohibited
and will void CSA Certification.
10. EXPLOSION PROTECTED TYPE INSTRUMENT
10.4.5 Installation Diagram Intrinsically
Safe (and Note)
Intrinsically safe
Hazardous Location
Group IIC, Zone 0
Class I, II, III, Division 1,
Groups A, B, C, D, E, F and G
[Integral type]
[Remote type]
DY-N (flowmeter)
A
B
T
DYC: Signal cable
(*1) Wire for T terminal
With temperature sensor type
Without temperature sensor type: not installed
Electrical parameters of vortex flowmeter (DY) and vortex flow
converter (DYA).
Ui (Vmax)=30 V
Ci=12 nF
Installation requirements between flowmeter, converter and
Safety Barrier
Uo Ui Io Ii Po
Lo Li+Lcable
Voc Vmax Isc
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 certified.
• 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.
10-10
Non Hazardous
Location
Safety barriers
DY (flowmeter)
SUPPLY
PULSE
Safety barriers
DYA (converter)
A
SUPPLY
B
T (*1)
PULSE
C
: installed
Ii (Imax)=165 mA Pi (Pmax)=0.9W
Li=0.15 mH
Pi Co Ci+Ccable
Imax Ca Ci+Ccable
IM 01F06A00-01E
F100401_1.EPS