Appendix I - Control schematic for wiring of intrinsically safe SmartCal for US & Canada
(Sheet 1 of 4)
Hazardous location
Class I, DIV 1, Groups A,B,C,D
Class II, DIV 1, Groups E,F,G
Rosemount® 275 HART®
Communicator-notes 3,6 & 9
Remote Hall effect sensor (optional)
No. 5 in 4th digit of part number.
50 feet max. length, 5 conductor 22
AWG cable provided with option
SmartCal series
positioner
Associated apparatus
(Intrinsic safety barriers)
Notes 1 & 2
Control
equipment
Note 4
Note 5
4-20 mA
JP5
Analog
output
Nonhazardous location
Entity parameters for each field wiring terminal pair of SmartCal:
Vmax = 30 V
Imax = 100 mA
Pi = 0.75 Watt
Ci = 0 pF
Li = 17.25 µH
1. FMRC Entity approved associated apparatus used in an approved configuration, such that:
A. SmartCal Vmax ≥ Voc and Vt of associated apparatus.
B. SmartCal Imax ≥ Isc and It of associated apparatus.
C. Ci of Sm 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 SmartCal, Li of Sm cable inductance ≤ La of associated
apparatus.
E. In cases where the Rosemount® 275 HART® Communicator is connected between the
associated apparatus and the SmartCal, 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 SmartCal. 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 250
V.
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 SmartCal 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).
page 37
AVID SmartCal valve positioner
Installation & operating instructions
