Pressure Switches In Intrinsically Safe Circuits (Ex-I) - Honeywell Fema DCM-203-574 Series Assembly And Operating Instructions Manual

6. Testing Principles and Safety Information for Ex-i, valid for Ch. 6.1 and 7
line for open-circuit or short-circuiting
(NAMUR).
6.1 Pressure Switches in In-
trinsically Safe Circuits (Ex-i)
according to chapter 5.7 of EN 60079-11,
"Simple electrical apparatus".
Fig. 18. Connection layout -513, -563
Gold contacts SPDT, switching differential
not adjustable.
The wiring diagram applies for max.
pressure monitoring. When pressure rises,
contact 3-1 opens and 3-2 closes.
Generally speaking, it is suitable for
installation only in combination with a
suitable EC-type tested switching amplifier.
This switching amplifier must be installed
30
outside of the Ex-zone. The wiring diagram
accompanying the switching amplifier and
the valid installation guidelines for Ex-i
circuits must be observed.
For intrinsically safe electrical circuits, the
following parameters must be observed:
U 24 VDC
i
I 100 mA
i
L 100 µH
i
C 1 nF
i
Type of Ex-protection
Gas: II 1/2G Ex ia IIC T6 Ga/Gb
Dust: II 1/2D Ex ia IIIC T80°C Da/Db
Ambient temperature: -20 ... +60 °C
Approvals
ATEX: IBExU12ATEX1040
IECEx: IECEx IBE 14.0077
MU2B-0238GE51 R0616D