Det-Tronics UD20 FlexVu Explosion-Proof Universal Display Unit - Manual (Page 7)

3.1 95-8620 5
+
–
24 VDC
UD20 DISPLAY UNIT
B2406
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
J2
NOTE 1 CONNECT THE GREEN SENSOR LEAD TO THE CHASSIS GROUND LUG
ON THE INSIDE BOTTOM OF THE UD20 DISPLAY UNIT ENCLOSURE.
NOTE 2 250 OHM RESISTOR REQUIRED (INCLUDED).
NOTE 3 EXTERNAL HART COMMUNICATION DEVICES CAN BE CONNECTED ACROSS
THE 250 OHM RESISTOR, ACROSS J2-5 AND J2-6, OR ACROSS J2-2 AND J2-3.
NOTE 4 JUNCTION BOX MUST BE ELECTRICALLY CONNECTED TO EARTH GROUND.
NOTE 5 GROUND THE SHIELD AT THE POWER SOURCE END ONLY.
SEE NOTES 2 AND 3
SEE NOTE 5
GT3000
GAS DETECTOR
+
+
–
–
SHIELD
SHIELD
SENSOR
LOOP
POWER
LOOP
BLACK
RED
GREEN SEE NOTE 1
HAZARDOUS LOCATION NON-HAZARDOUS LOCATION
Figure 3—Basic Wiring for Explosion Proof UD20 with GT3000
+
–
24 VDC
UD20 DISPLAY UNIT
B2483
J2-6
J2-5
J2-4
J2-3
J2-2
J2-1
J2
NOTE 1 GROUND THE SHIELD AT THE POWER SOURCE END ONLY.
NOTE 2 250 OHM RESISTOR REQUIRED (INCLUDED).
NOTE 3 EXTERNAL HART COMMUNICATION DEVICES CAN BE CONNECTED ACROSS
THE 250 OHM RESISTOR, ACROSS J2-5 AND J2-6, OR ACROSS J2-2 AND J2-3.
NOTE 4 JUNCTION BOXES MUST BE ELECTRICALLY CONNECTED TO EARTH GROUND.
BLACK
RED
SEE NOTE 1
SEE NOTES 2 AND 3
SEE NOTE 1
GT3000
GAS DETECTOR
SENSOR TERMINATION BOX
RED
RED
BLA
CK
BLACK
GREEN
+
+
–
–
SHIELD
SHIELD
SENSOR
LOOP
POWER
LOOP
HAZARDOUS LOCATION NON-HAZARDOUS LOCATION
Figure 4—Basic Wiring for Explosion Proof UD20 and GT3000 with Terminal Box