PR electronics 9202 Serie Manual Del Producto página 32

LERBAKKEN 10, 8410 RØNDE DENMARK
Installation notes 9202Bxx:
Associated Equipment /Appareillage Associé [Ex ia]
The Ex output current of this associated apparatus is limited by a resistor such that the output voltage-current
plot is a straight line drawn between open-circuit voltage and short-circuit current.
Selected intrinsically safe equipment must be third party listed as intrinsically safe for the application, and
have intrinsically safe entity parameters conforming withTable 1 below.
TABLE 1:
I.S. Equipment
V max (or Ui) ≥
I max (or Ii) ≥
P max, Pi ≥
Ci + Ccable ≤
Li + Lcable ≤
The module may also be connected to a simple apparatus as defined in Article 504.2
and installed and temperature classified in accordance with Article 504.10(D) of the National Electrical
Code (ANSI/NFPA 70), or other local codes, as applicable.
Capacitance and inductance of the field wiring from the intrinsically safe equipment to the associated
apparatus shall be calculated and must be included in the system calculations as shown in Table 1. Cable
capacitance, Ccable, plus intrinsically safe equipment capacitance, Ci must be less than the marked
capacitance, Ca (or Co), shown on any associated apparatus used. The same applies for inductance (Lcable,
Li and La or Lo, respectively). Where the cable capacitance and inductance per foot are not known, the
following values shall be used: Ccable = 60 pF/ft., Lcable = 0.2 μH/ft.
Where multiple circuits extend from the same piece of associated apparatus, they must be installed in
separate cables or in one cable having suitable insulation. Refer to Article 504.30(B) of the National Electrical
Code (ANSI/NFPA 70) and Instrument Society of America Recommended Practice ISA
RP12.06 for installing intrinsically safe equipment.
Intrinsically safe circuits must be wired and separated in accordance with Article 504.20 of the
National Electrical Code (ANSI/NFPA 70) or other local codes, as applicable.
The module has not been evaluated for use in combination with another associated apparatus.
For installations in which both the Ci and Li of the intrinsically safe apparatus exceeds 1% of the
Ca (or Co) and La (or Lo) parameters of the associated apparatus (excluding the cable), then 50% of Ca
(or Co) and La (or Lo) parameters are applicable and shall not be exceeded. The reduced capacitance shall
not be greater than 1 μF for Groups C and/or D, and 600 nF for Groups A and B. The values of Ca (or Co) and
La (or Lo) determined by this method shall not be exceeded by the sum of all of Ci plus cable capacitances
and the sum of all of the Li plus cable inductances in the circuit respectively.
Revision date:
2019-07-23
32
Associated Apparatus
Voc or Vt (or Uo)
Isc or It (or Io)
Po
Ca (or Co)
La (or Lo)
Version Revision
V1 R0
9202 - Versión del producto 9202-003
9202QU01
Prepared by:
PB
Page:
3/5