Specifications

WESTLOCK CONTROLS CORPORATION
280 MIDLAND AVENUE, SADDLE BROOK, NJ 07663 TEL: [phone] FAX: [phone]
www.westlockcontrols.com
1/12/10 TECH-439/D.W.O. 19024 Page 52 of 58
Appendix H
Control Schematic for Wiring of Intrinsically safe ICoT (WD-10836) for US
& CANADA
(Sheet 1 of 4)
Entity parameters for each field wiring terminal pair of ICoT:
Vmax = 30V Imax = 100mA Pi=0.75 Watt
Ci = 0 pF Li = 17.25 uH
1. FMRC Entity approved associated apparatus used in an approved configuration, such that:
A. ICoT Vmax  Voc and Vt of associated apparatus.
B. ICoT Imax  Isc and It of associated apparatus.
C. Ci of ICoT + Ci of ROSEMOUNT
®
275 HART
®
COMMUNICATOR (if used) + cable capacitance  Ca of
associated apparatus.
D. In cases where the ROSEMOUNT
®
275 HART
®
COMMUNICATOR is not connected between the
associated apparatus and the ICoT, Li of ICoT + cable inductance  La of associated apparatus.
E. In cases where the ROSEMOUNT
®
275 HART
®
COMMUNICATOR is connected between the associated
apparatus and the ICoT, cable inductance should be determined in accordance with ROSEMOUNT
®
installation drawing 00275-0081.
2. Associated apparatus manufacturer’s installation drawing must be followed when installing this equipment.
3. In cases where the ROSEMOUNT
®
275 HART
®
COMMUNICATOR is connected between the associated
apparatus and the ICoT. ROSEMOUNT
®
installation drawing 00275-0081 must be followed when installing
this equipment.
4. Control equipment connected to associated apparatus must not use or generate more than 250V.
5. To maintain intrinsic safety, each field wiring pair (4-20 mA and Analog Output) must be run in separate
cables or separate shields connected to intrinsically safe (Associated Apparatus) ground.
6. ROSEMOUNT
®
275 HART
®
COMMUNICATOR is NOT FMRC approved for use in Class II and III Hazardous
Locations.
7. For Class II and III locations where rigid metal conduit is not used, seal ICoT cable entries against dust and
fibers using an appropriate NRTL listed cable gland fitting.
8. Installation should be in accordance with ANSI/ISA RP12.6 and the National Electrical Code (ANSI/NFPA 70).