Specifications

10/31/02 Tech-304/DWO 14195 Page 36 of 39
Appendix E
Control Schematic for Wiring of Intrinsically safe ICoT (WD-10836)
(Sheet of 3 of 4)
ANALOG
OUTPUT
4-20mA
NONHAZARDOUS LOCATION
ASSOCIATED APPARATUS
(INTRINSIC SAFETY
BARRIERS) MTL MODEL 3045
NOTE 1
MTL MODEL 7087 FOR DIGITAL
ON/OFF INPUTS
CONTROL
EQUIPMENT
NOTE 2
NOTE 3
ROSEMOUNT 275 HART
COMMUNICATOR-NOTE 4
ICoT SERIES
POSITIONER
HAZARDOUS LOCATION
CLASS I , DIV 1, GROUPS A,B,C,D
CLASS II , DIV 1, GROUPS E,F,G
CLASS III , DIV 1
3
1
4
2
2
4
1
3
4
1
5
2
2
5
1
4
MAGNUM
SWITCH
OPTION
{
1. Associated apparatus manufacturer’s installation drawing must be followed when installing this equipment.
2. Control equipment connected to associated apparatus must not use or generate more than 250V.
3. 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.
4. ROSEMOUNT
®
275 HART
®
COMMUNICATOR is NOT FMRC approved for use in Class II and III Hazardous
Locations.
5. 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.
6. Installation should be in accordance with ANSI/ISA RP12.6 and the National Electrical Code (ANSI/NFPA 70).
HAZARDOUS LOCATION &
CONFIGURATION
GP A OR B LOCATION W/
COMMUNICATOR
GP C,D,E,F,G LOCATION
W/ COMMUNICATOR
GP A OR B LOCATION
W/OUT COMMUNICATOR*
GP C,D,E,F,G LOCATION
W/OUT COMMUNICATOR*
MAXIMUM ALLOWABLE
FIELD WIRING
CAPACITANCE
30nF
230nF
100nF
300nF
MAXIMUM FIELD WIRING CAPACITANCE AND INDUCTANCE
MAXIMUM ALLOWABLE
FIELD WIRING
INDUCTANCE
4.0mH
16mH
16mH
4.0mH
* ROSEMOUNT
®
275 HART
®
COMMUNICATOR not used or used only on the INPUT side of associated appara-