User Manual

Table Of Contents
B
Installation Guide 98-1135 Rev AB 121
Installation in Hazardous
Locations
Information
The following information describes and limits what can be attached to the GPR in a Division 1
location per the UL certification.
1. GPR 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 GPR 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 GPRs 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 GPR
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.
I.S Equipment GPR
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