StoneL Prism PI - Page 12

7 PI 70 en12 | Prism PI
StoneL publication 105431revC
Typical basic intrinsically safe circuits
NAMUR sensor circuit
Solenoid circuit
4.1.2 NAMUR sensor (45S) continued
** Barrier o
ff state (target off): current in NAMUR sensor circuit >2.1 mA
Barrier on
state (target on): current in NAMUR sensor circuit <1.0 mA
power
source
Hazardous area
NAMUR
repeater
barrier
24 VDC
computer input
8 VDC
I = 0.5mA to 5.0mA**
NAMUR sensor
power
source
Hazardous area
solenoid
barrier
24 VDC
computer output
solenoid coil