User Manual

B
Installation Guide 98-1678 Rev AA 31
Installation in Hazardous
Locations
Information
The following information describes and limits what can be attached to the GPR2-PT in a Division 1
location per the UL certification.
1. GPR2-PT Entity Parameters:
• Uo (Voc) = 6.3 V dc
• Io (Isc) = 7.34 A
• Po = 5.91 W
• Co (Ca) = 207 uF
• Lo (La) = 43 uH
2. The output current of the GPR2-PT 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.
3. Selected intrinsically safe equipment must be third party listed as intrinsically safe for the
application, and have intrinsically safe entity parameters conforming to Table B - 1 below.
4. This associated apparatus may also be connected to simple apparatus as defined in Article 504.2
and installed and temperature classified in accordance with article 504.10(B) of the National
Electrical Code (ANSI/NFPA 70), or other local codes, as applicable. The GPR2-PTs described
in this guide qualify as simple apparatus for the purposes of intrinsic safety.
5. Capacitance and Inductance of the field wiring from the intrinsically safe equipment to the
GPR2-PT shall be calculated and must be included in the system calculation as shown in Table B
- 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=60pF/ft., Lcable=
0.2 uH/ft. The total capacitance and inductance of each I.S. device and associated cable is to be
added together and cannot exceed the stated Co and Lo values.
Table B - 1. Conforming Safety Parameters
I.S Equipment GPR2-PT
Ui (or V max)
or
6.3 V dc
Ii (or I max) 7.34 A
Pi (or P max) 5.91 W
Ci + Ccable 207 uF
Li + Lcable 43 uH