Yokogawa EJA438 - Manual (Page 11)

IM 1C22J1-01E 2-3
2. HANDLING CAUTIONS
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 the + and – SUPPLY terminals 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.
2.9 Installation of Explosion
Protected Type
NOTE
For FOUNDATION Fieldbus explosion protected
type, please refer to IM 1C22T2-01E.
WARNING
To pressure the safety of explosionproof equip-
ment requires great care during mounting,
wiring, and piping. Safety requirements also
place restrictions on maintenance and repair
activities. Please read the following sections very
carefully.
2.9.1 FM Approval
a. FM Intrinsically Safe Type
Caution for FM intrinsically safe type. (Following
contents refer “DOC. No. IFM012-A12 P.1 and 2.”)
Note 1. Model EJA Series pressure transmitters
with optional code /FS1 are applicable for
use in hazardous locations.
• Intrinsically Safe for Class I, Division 1, Groups A,
B, C & D. Class II, Division 1, Groups E, F & G
and Class III, Division 1 Hazardous Locations.
• Nonincendive for Class I, Division 2, Groups A, B,
C & D. Class II, Division 2, Groups E, F & G and
Class III, Division 1 Hazardous Locations.
• Outdoor hazardous locations, NEMA 4X.
• Temperature Class: T4
• Ambient temperature: –40 to 60
°
C
Note 2. Entity Parameters
• Intrinsically Safe Apparatus Parameters
[Groups A, B, C, D, E, F and G]
Vmax = 30 V
Ci = 22.5 nF
Imax = 165 mA Li = 730
µ
H
Pmax = 0.9 W
* Associated Apparatus Parameters
(FM approved barriers)
Voc
≤
30 V Ca > 22.5 nF
Isc
≤
165 mA La > 730
µ
H
Pmax
≤
0.9W
• Intrinsically Safe Apparatus Parameters
[Groups C, D, E, F and G]
Vmax = 30 V
Ci = 22.5 nF
Imax = 225 mA Li = 730
µ
H
Pmax = 0.9 W
* Associated Apparatus Parameters
(FM approved barriers)
Voc
≤
30 V Ca > 22.5 nF
Isc
≤
225 mA La > 730
µ
H
Pmax
≤
0.9 W
• Entity Installation Requirements
Vmax
≥
Voc or Vt, Imax
≥
Isc or It,
Pmax (IS Apparatus)
≥
Pmax (Barrier)
Ca
≥
Ci + Ccable, La
≥
Li + Lcable
Note 3. Installation
• Barrier must be installed in an enclosure that meets
the requirements of ANSI/ISA S82.01.
• Control equipment connected to barrier must not
use or generate more than 250 V rms or V dc.
• Installation should be in accordance with ANSI/
ISA RP12.6 “Installation of Intrinsically Safe
Systems for Hazardous (Classified) Locations” and
the National Electric Code (ANSI/NFPA 70).
• The configuration of associated apparatus must be
FMRC Approved.