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AVID SmartCal valve positioner
Installation & operating instructions
Control schematic for wiring of intrinsically safe SmartCal for ATEX & IECEX
(Sheet 2 of 2)
Hazardous location
Ex ia IIC
SmartCal series
positioner
Associated apparatus
(Intrinsic safety barriers)
Notes 1 & 2
Control
equipment
Note 4
Note 5
4-20 mA
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
ATEX notes:
1. Barrier must be a ATEX certified, single channel grounded shunt-diode zener barrier or single
channel isolating barrier or one dual channel or two single channel barriers may be used where
both channels have been certified for use together with combined entity parameters.
The following conditions must be satisfied:
Voc or Vo ≤ Vmax or Ui
Ca > Ci + C Cable
Isc or Io ≤ Imax or Ii
La > Li + L Cable
2. Associated apparatus manufacturer’s installation drawing must be followed when installing this
equipment.
3. Control equipment connected to associated apparatus must not use or generate more than 250 V.
4. 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.
5. Where rigid metal conduit is not used, seal SmartCal cable entries against dust and fibers using
an appropriate NRTL listed cable gland fitting.
6. Installation should be in accordance with the local / national electrical codes of practice.
