Operation Manual

<14. EXPLOSION PROTECTED TYPE INSTRUMENT>
14-10
IM 01F06A00-01EN
Special conditions for safe use
• Precautions shall be taken to minimize the risk
from electrostatic discharge of painted parts.
• When the enclosure of the fl ow meter or the
fl ow converter are made of aluminum, if it is
mounted in an area where the use of EPL Ga
equipment is required, it must be installed such
that, even in the event of rare incidents, ignition
sources due to impact and friction sparks are
excluded.
• The dielectric strength of at least 500 V a.c.
r.m.s. between the intrinsically safe circuits and
the enclosure of the fl ow meter or the converter
is limited only by the overvoltage protection.
(2) Installation
WARNING
• All wiring shall comply with local installation
requirements and local electrical code.
• Use the suitable heat-resisting cables (over
90°C) for the digitalYEWFLO Model DY
Series Vortex Flowmeter when the ambient
temperature exceeds 60°C and/or the
process temperature exceeds 200°C.
• Cable gland and adapters shall be of Ex “d”
for Ex “d” installations.
• Cable gland and adapters shall be installed
so as to maintain the specifi ed degree of
protection (IP Code) of the fl owmeter.
The grounding terminals are located on the inside
and outside of the terminal area.
Connect the cable to grounding terminal in
accordance with wiring procedure (1) or (2).
Case
Cable
Screw
(1) Internal grounding terminal (2) External grounding terminal
Washer
Washer
Cable
Clamp
Screw
F1406.ai
Figure 14.2 Wiring Procedure for Grounding
Terminals
(3) Operation
WARNING
• Wait 3 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.
(4) Maintenance and Repair
WARNING
• The instrument modifi cation or parts
replacement by other than authorized
representative of Yokogawa Electric
Corporation is prohibited and will void the
certifi cation.