IM 01C25R01-01E
3-3
3. HANDLING CAUTIONS
• Insulation Resistance Test
1) Short-circuit four terminals of ,
SUPPLY –, PULSE + and – in the terminal box.
2) Turn OFF the insulation tester. Then connect the
insulation tester plus (+) lead wire to the shorted
SUPPLY terminals and the minus (–) leadwire to
the grounding terminal.
3) Turn ON the insulation tester power and measure
the insulation resistance. The voltage should be
applied as briefly as possible to verify that the
insulation resistance is at least 20 M
Ω
.
4) After completing the test and being very careful not
to touch exposed conductors disconnect the
insulation tester and connect a 100 k
Ω
resistor
between the grounding terminal and the short-
circuiting SUPPLY terminals. Leave this resistor
connected at least one second to discharge any
static potential. Do not touch the terminals while it
is discharging.
• Dielectric Strength Test
1) Short-circuit four terminals of ,
SUPPLY –, PULSE + and – in the terminal box.
2) Turn OFF the dielectric strength tester. Then
connect the tester between the shorted SUPPLY
terminals and the grounding terminal. Be sure to
connect the grounding lead of the dielectric strength
tester to the ground terminal.
3) Set the current limit on the dielectric strength tester
to 10 mA, then turn ON the power and gradually
increase the test voltage from ‘0’ to the specified
voltage.
4) When the specified voltage is reached, hold it for
one minute.
5) After completing this test, slowly decrease the
voltage to avoid any voltage surges.
3.9 Installation of an Explosion-
Protected Instrument
WARNING
For FOUNDATION Filedbus explosion protedted
type, please refer to IM 01C25R03-01E.
If a customer makes a repair or modification to an
intrinsically safe or explosionproof instrument and the
instrument is not restored to its original condition, its
intrinsically safe or explosionproof construction may
be compromised and the instrument may be hazardous
to operate. Please contact Yokogawa before making
any repair or modification to an instrument.
CAUTION
This instrument has been tested and certified as
being intrinsically safe or explosionproof. Please
note that severe restrictions apply to this
instrument’s construction, installation, external
wiring, maintenance and repair. A failure to
abide by these restrictions could make the
instrument a hazard to operate.
WARNING
Maintaining the safety of explosionproof equip-
ment requires great care during mounting,
wiring, and piping. Safety requirements also
place restrictions on maintenance and repair.
Please read the following sections very carefully.
WARNING
The range setting switch must not be used in a
hazardous area.
WARNING
Make sure to apply necessary protections on the
external temperature input cable, so as to avoid
damages leading to an earth fault.
3.9.1 FM Approval
a. FM Explosionproof Type
Caution for FM explosionproof type.
Note 1. Model EJX910A multivariable transmitters
with optional code /FF1 are applicable for
use in hazardous locations.
• Explosionproof for Class I, Division 1, Groups B,
C and D.
• Dust-ignitionproof for Class II/III, Division 1,
Groups E, F and G.
• Enclosure rating: NEMA 4X.
• Temperature Class: T6
• Ambient Temperature: –40 to 60
°
C
• Supply Voltage: 42 V dc max.
• Output signal: 4 to 20 mA
Note 2. Wiring
• All wiring shall comply with National Electrical
Code ANSI/NFPA70 and Local Electrical Codes.
